SpringSource Core-Spring (based on Spring

budget friendly provider signals as much as Airbus aviation statistics platform | killexams.com Real Questions and Pass4sure dumps

Passengers board a flight of Spring airlines at Ningbo's foreign airport, Zhejiang province. (photograph by using Zhang Peijian/For China daily)

China' biggest in your price range carrier Spring airlines introduced on Monday it will adopt Airbus' aviation statistics platform Skywise Core, fitting the primary airline in the chinese mainland to get related to the system that aims to support airlines enhance operational efficiency and support their digital transformation.

in line with the agreement signed between both, by using Skywise Core, Spring airways may be able to combine its personal operational, upkeep, and plane information into the Skywise cloud-based mostly system, so that it will probably save, access, manage, and analyze chosen Airbus facts along side its own facts and global benchmarks with out the need for extra infrastructure investment.

on the signing ceremony, the two facets agreed to work intently collectively to increase and display new facts-pushed functions for aviation. presently, Shanghai-primarily based Spring airways operates an all-Airbus A320 fleet of 81 aircraft in China.

"The application of Skywise Core will raise Spring airlines' massive records processing potential and effectivity, as a way to facilitate its digitalization," pointed out Spring airlines Chairman Wang Yu.

Digitalization is greatly believed to contain new increase cost for each domestic and international carriers to take advantage of, in terms of safeguard, bigger effectivity and lessen prices, said Li Lei, an industrial analyst with Minze Securities.

an editorial by way of Honeywell Aerospace stated that as lots as 844TB (terabyte) facts can be created with the aid of a slender-body plane's 12 hours of flying, which might be comparable to more than 20,000 4K decision movies. The big volume of records are in need of being identified, analyzed, and explored to increase the performance of the airways.

"Skywise has effective records-inspecting capabilities and it may well support airplanes make predicative renovation and eliminate anomalies accurately," talked about Xu Kang, deputy familiar manager with Spring airlines' renovation engineering division.

in line with Xu, by getting access to Skywise's large statistics, engineers of Spring airlines can make intervention earlier than a malfunction occurs and alter add-ons to steer clear of flight delays or cancellations.

Over contemporary years, the chinese language govt and native airways were taking a proactive perspective towards the adoption of recent applied sciences.

as an example, the Civil Aviation Administration of China (CAAC) lifted the ban on in-flight moveable digital contraptions in January 2018, which allows carriers to make their personal guidelines for passengers' the use of electronic devices.

In January, Guangzhou-primarily based China Southern airways opened on-line seat preference for all home flights and paperless e-boarding passes. in the first week, about 75 p.c of home routes' passengers tried the digital devices, in response to a record by way of Xinhua information agency, citing China Southern sources.

Skywise is an business facts platform riding digital collaboration throughout the aerospace price chain. It hastens digitalization in aviation by means of presenting gamers across the sectors with the records and capabilities they should make improved choices.

With the participation of Spring airlines, there are fifty four airways globally applying the Skywise platform, with about four,500 aircraft related to it.

The big statistics platform will provide new insights at plane, fleet, business, and world degrees while permitting the operator to increase its operations through entry to OEM knowledge and international fleet context.

Spring for Apache Hadoop Goes reside | killexams.com Real Questions and Pass4sure dumps

news

Spring for Apache Hadoop Goes are living

by using John okay. Waters

02/28/2013

SpringSource on Tuesday announced the standard availability release of Spring for Apache Hadoop, which integrates the Hadoop framework for facts-intensive distributed computing with the Spring Java/J2EE application construction framework.

Developer Costin Leau introduced the 1.0 unlock on the SpringSource community blog very nearly exactly one year after he introduced the primary milestone unlock. The mixture of both frameworks, he wrote, "gives a constant programming and configuration model across a wide range of Hadoop ecosystem projects: rather than dictating what to make use of, the framework embraces and enhances your expertise stack, staying proper to the core Spring concepts."

Spring is among the most usual Java app frameworks in the marketplace these days. it's an open-supply, layered Java/J2EE framework in accordance with code posted in SpringSource founder Rod Johnson's ebook professional One-on-One Java EE Design and building (Wrox Press, October 2002). besides the fact that children SpringSource has been a Java-focused operation, the framework has been ported to .web.

Hadoop, additionally open-source, is a Java-primarily based platform for the disbursed processing of large facts sets across clusters of computers the usage of an easy programming mannequin. Combining both frameworks makes it possible for enterprise Java builders to construct functions that scale from one server to lots, and to deliver excessive availability in the course of the utility, in place of hardware.

The combined frameworks also assist finished HDFS data entry via such Java digital machine (JVM) scripting languages as Groovy, JRuby, Jython and Rhino. HDFS (Hadoop dispensed File system) is designed to scale to petabytes of storage and to run on correct of the file programs of the underlying OS.

The record of Spring Apache Hadoop capabilities also comprises: declarative configuration guide for HBase; committed Spring Batch support for developing workflow options that comprise HDFS operations and "all kinds of Hadoop jobs;" support for the use with Spring Integration "that offers convenient entry to a wide range of present techniques using an extensible experience-pushed pipes and filters structure;" Hadoop configuration options and templating mechanism for client connections to Hadoop; and declarative and programmatic support for Hadoop equipment, together with FsShell and DistCp.

SpringSource has supplied sample purposes (already compiled and equipped for down load) that cowl a variety of eventualities, Leau said. The samples "complement the finished user documentation," which includes a bit on a way to get stared with Spring for Apache Hadoop using Amazon's Elastic MapReduce service.

Spring for Apache Hadoop is supplied out of the box in the distro from the Greenplum massive-data analytics neighborhood, these days spun off from mum or dad enterprise EMC to the Pivotal Initiative. And Leau spoke of it's being proven day by day towards a number of Hadoop 1.x distros, together with vanilla Apache Hadoop, Cloudera CDH3 and CDH4.

"We need to be sure [it] works reliably no matter your Hadoop atmosphere," he spoke of.

Spring for Apache Hadoop has been launched below the open supply Apache 2.0 license. it be available now as a free down load.

China's greatest cost effective provider to make use of Airbus Skywise data platform | killexams.com Real Questions and Pass4sure dumps

Spring airlines, China's largest low-cost provider, has signed an settlement with Airbus to place into use its Skywise Core platform in the airline's fleet, announced Airbus China Monday.

in response to the settlement, by using Skywise Core, Spring airlines will integrate its operational, maintenance, and different aircraft information into the Skywise cloud and get hold of records-linked services through it.

The Shanghai-primarily based Spring airlines operates an all Airbus A320 fleet of greater than eighty aircraft.

With the cloud-based mostly information platform, the airline can keep, entry, control and analyze chosen Airbus information along with its own fleet operation facts and international benchmarks without the want for extra infrastructure investments.

The settlement between Spring airways and Airbus is a vital step of the Skywise software in the chinese language market. either side will work carefully collectively to advance and exhibit new records-driven purposes in the civil aviation sector, Airbus stated.

Digitalization is among the many major developments of the global aviation trade. it's highly expected to support producers and airways cut back prices and upgrade work effectivity through the collaboration of digital technologies.

Skywise is an enterprise information platform riding digital collaboration throughout the aerospace cost chain. This facts would deliver instant price for airlines' unbiased protection and different operations, Airbus talked about.

by way of the end of 2018, there were more than 1,seven hundred Airbus plane serving within the chinese market, mentioned information from Airbus China. 

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Core-Spring (based on Spring 3.2)

Tips to help sell your home in the winter | killexams.com real questions and Pass4sure dumps

By Jon Coile

February 18 at 8:00 AM

The number of new listings in the Washington area dropped in December by 3.2 percent compared to December 2017, and the number of active listings dipped by 0.5 percent in December compared to active listings in December 2017.

Active listings refer to all the homes on the market, while new listings count only those that are new to the market. While fewer homes tend to be listed for sale in December and January, sellers also face a smaller pool of buyers during the winter months.

Sellers who want a quick sale at a high price -- and who doesn’t? -- may want to take a fresh look at how to make their house appealing and warm even during January and February’s icy weather. Fifty percent of the real estate agents surveyed by in the National Association of Realtors’ 2017 Profile of Staging said that staging before a sale increases the amount of an offer by 1 to 10 percent. Thirty-nine percent of Realtors said staging greatly decreases the amount of time a home is on the market.

[More Coile: Outside-the-box thinking can help millennials on a tight budget buy their first home]

Preparing your home for sale should always include a round of minor fixes such as tightening knobs and scrubbing baseboards as well as removing clutter so buyers can visualize themselves in your home.

Here are some tips to help sell your house in the winter:

Keep your heat on high. Buyers who are dashing from one house to the next will appreciate the chance to warm up in your house and are more likely to stay longer and consider your house more closely when it feels cozy. 

Make your home welcoming. Simmering cinnamon or baking cookies is especially appealing in the winter and will make your home smell delicious. Even if your house is closed up, you don’t want fake smells such as air fresheners that make buyers suspicious.  

Keep muddy footprints to a minimum. Winter storms and leftover slush can lead to muddy shoes and boots that quickly turn your foyer from pristine to filthy. Make sure you have mats outside and indoors to catch some of the dirt. Washable ones are great to keep around to swap out if one gets dirty. Keep your front walk and steps as clean as possible. Don’t post a sign to ask buyers to remove their shoes or offer paper shoe covers if you’re showing your home on a stormy day. The considerate ones will take their shoes off. The others will be offended and won’t want to buy your house. Cleaning up your foyer is just a cost of doing business having your house on the market during the winter months.  

Spruce up your landscaping. While you don’t have the advantage of spring and summer flowers, you should still do your best to keep your front and back yards as neat as possible. Make sure fall’s leaves have been swept and your garden beds are neat. Trim any branches that come loose during a storm. You can add color with an evergreen shrub in a pot or a neutral winter wreath on your door. 

[More Coile: How to start buying rental property]

Make your home light and bright. Switch to brighter light bulbs and make sure all your light fixtures are clean and working. Open blinds and window treatments allow in natural light in any season, but buyers will notice the light even more during the short days of winter.  

Check your outdoor lighting. Buyers may be out looking in the afternoon and early evening when it’s already dark, so be sure to keep your front door light on for potential buyers who might be driving by to check out the neighborhood. Add inexpensive lighting to your outdoor space and your front walk, too. 

Don’t forget the power of flowers. A splash of color from a vase of flowers can add warmth to a room and brighten a dreary day, lifting the spirits and enthusiasm of visitors. 

When winter’s pace of home sales slows, staging your house as a warm and colorful oasis can go a long way to enticing a buyer before spring arrives.

Jon Coile, chairman of Rockville-based multiple-listing service Bright MLS (formerly MRIS) and president of Champion Realty in Annapolis, Md., writes occasional commentary on the Washington area housing market.

Low-cost carrier signs up to Airbus aviation data platform | killexams.com real questions and Pass4sure dumps

Passengers board a flight of Spring Airlines at Ningbo's international airport, Zhejiang province. (Photo by Zhang Peijian/For China Daily)

China' largest low-cost carrier Spring Airlines announced on Monday it will adopt Airbus' aviation data platform Skywise Core, becoming the first airline in the Chinese mainland to get connected to the system that aims to help airlines improve operational performance and support their digital transformation.

According to the agreement signed between the two, by using Skywise Core, Spring Airlines will be able to integrate its own operational, maintenance, and aircraft data into the Skywise cloud-based system, so that it can store, access, manage, and analyze selected Airbus data together with its own data and global benchmarks without the need for additional infrastructure investment.

At the signing ceremony, the two sides agreed to work closely together to develop and demonstrate new data-driven applications for aviation. Currently, Shanghai-based Spring Airlines operates an all-Airbus A320 fleet of 81 aircraft in China.

"The application of Skywise Core will enhance Spring Airlines' big data processing capability and efficiency, so as to facilitate its digitalization," said Spring Airlines Chairman Wang Yu.

Digitalization is widely believed to contain new growth value for both domestic and international carriers to exploit, in terms of safety, higher efficiency and lower costs, said Li Lei, an industrial analyst with Minze Securities.

An article by Honeywell Aerospace said that as much as 844TB (terabyte) data will be created by a narrow-body aircraft's 12 hours of flying, which are equivalent to more than 20,000 4K resolution movies. The huge amount of data are in need of being identified, analyzed, and explored to improve the performance of the airlines.

"Skywise has powerful data-analyzing functions and it can help airplanes make predicative maintenance and eliminate anomalies accurately," said Xu Kang, deputy general manager with Spring Airlines' maintenance engineering division.

According to Xu, by accessing Skywise's big data, engineers of Spring Airlines can make intervention before a malfunction happens and change components to avoid flight delays or cancellations.

Over recent years, the Chinese government and local airlines have been taking a proactive attitude toward the adoption of new technologies.

For example, the Civil Aviation Administration of China (CAAC) lifted the ban on in-flight portable electronic devices in January 2018, which allows carriers to make their own rules for passengers' using electronic devices.

In January, Guangzhou-based China Southern Airlines opened online seat selection for all domestic flights and paperless e-boarding passes. In the first week, about 75 percent of domestic routes' passengers tried the digital devices, according to a report by Xinhua News Agency, citing China Southern sources.

Skywise is an enterprise data platform driving digital collaboration across the aerospace value chain. It accelerates digitalization in aviation by providing players across the sectors with the data and capabilities they need to make better decisions.

With the participation of Spring Airlines, there are 54 airlines globally applying the Skywise platform, with about 4,500 aircraft connected to it.

The big data platform will provide new insights at aircraft, fleet, company, and global levels while allowing the operator to enhance its operations through access to OEM expertise and global fleet context.

A Guide to Spring Framework Annotations | killexams.com real questions and Pass4sure dumps

The Java programming language provided support for annotations from Java 5.0 onward. Leading Java frameworks were quick to adopt annotations, and the Spring Framework started using annotations from the 2.5 release. Due to the way they are defined, annotations provide a lot of context in their declaration.

Prior to annotations, the behavior of the Spring Framework was largely controlled through XML configuration. Today, the use of annotations provide us tremendous capabilities in how we configure the behaviors of the Spring Framework.

In this post, we’ll take a look at the annotations available in the Spring Framework.

Core Spring Framework Annotations @Required

This annotation is applied to bean setter methods. Consider a scenario where you need to enforce a required property. The @Required annotation indicates that the affected bean must be populated at configuration time with the required property. Otherwise, an exception of type BeanInitializationException is thrown.

@Autowired

This annotation is applied to fields, setter methods, and constructors. The @Autowired annotation injects object dependency implicitly.

When you use @Autowired on fields and pass the values for the fields using the property name, Spring will automatically assign the fields with the passed values.

You can even use @Autowired on private properties, as shown below. (This is a very poor practice though!)

public class Customer { @Autowired private Person person; private int type; }

When you use @Autowired on setter methods, Spring tries to perform it by Type autowiring on the method. You are instructing Spring that it should initiate this property using a setter method where you can add your custom code, like initializing any other property with this property.

public class Customer { private Person person; @Autowired public void setPerson (Person person) { this.person=person; } }

Consider a scenario where you need an instance of class A, but you do not store A in the field of the class. You just use A to obtain an instance of B, and you are storing B in this field. In this case, setter method autowiring will better suit you. You will not have class-level unused fields.

When you use @Autowired on a constructor, then constructor injection happens at the time of object creation. It tells the constructor to autowire when used as a bean. One thing to note here is that only one constructor of any bean class can carry the @Autowired annotation.

@Component public class Customer { private Person person; @Autowired public Customer (Person person) { this.person=person; } }

NOTE: As of Spring 4.3, @Autowired became optional on classes with a single constructor. In the above example, Spring would still inject an instance of the Person class if you omitted the @Autowired annotation.

@Qualifier

This annotation is used along with the @Autowired annotation. When you need more control of the dependency injection process, @Qualifier can be used. @Qualifier can be specified on individual constructor arguments or method parameters. This annotation is used to avoid the confusion that occurs when you create more than one bean of the same type and want to wire only one of them with a property.

Consider an example where an interface BeanInterface is implemented by two beans, BeanB1 and BeanB2.

@Component public class BeanB1 implements BeanInterface { // } @Component public class BeanB2 implements BeanInterface { // }

Now if BeanA autowires this interface, Spring will not know which one of the two implementations to inject.

One solution to this problem is the use of the @Qualifier annotation.

@Component public class BeanA { @Autowired @Qualifier("beanB2") private IBean dependency; ... }

With the @Qualifier annotation added, Spring will now know which bean to autowire, where beanB2 is the name of BeanB2.

@Configuration

This annotation is used on classes that define beans. @Configuration is an analog for an XML configuration file – it is configuration using Java classes. A Java class annotated with @Configuration is a configuration by itself and will have methods to instantiate and configure the dependencies.

Here is an example:

@Configuartion public class DataConfig { @Bean public DataSource source() { DataSource source = new OracleDataSource(); source.setURL(); source.setUser(); return source; } @Bean public PlatformTransactionManager manager() { PlatformTransactionManager manager = new BasicDataSourceTransactionManager(); manager.setDataSource(source()); return manager; } } @ComponentScan

This annotation is used with the @Configuration annotation to allow Spring to know the packages to scan for annotated components. @ComponentScan is also used to specify base packages using basePackageClasses or basePackage attributes to scan. If specific packages are not defined, scanning will occur from the package of the class that declares this annotation.

@Bean

This annotation is used at the method level. The @Bean annotation works with @Configuration to create Spring beans. As mentioned earlier, @Configuration will have methods to instantiate and configure dependencies. Such methods will be annotated with @Bean. The method annotated with this annotation works as the bean ID, and it creates and returns the actual bean.

Here is an example:

@Configuration public class AppConfig { @Bean public Person person() { return new Person(address()); } @Bean public Address address() { return new Address(); } } @Lazy

This annotation is used on component classes. By default, all autowired dependencies are created and configured at startup. But if you want to initialize a bean lazily, you can use the @Lazy annotation over the class. This means that the bean will be created and initialized only when it is first requested for. You can also use this annotation on @Configuration classes. This indicates that all @Bean methods within that @Configuration should be lazily initialized.

@Value

This annotation is used at the field, constructor parameter, and method parameter levels. The @Value annotation indicates a default value expression for the field or parameter to initialize the property with. As the @Autowired annotation tells Spring to inject an object into another when it loads your application context, you can also use the @Value annotation to inject values from a property file into a bean’s attribute. It supports both #{...} and ${...} placeholders.

Spring Framework Stereotype Annotations @Component

This annotation is used on classes to indicate a Spring component. The @Component annotation marks the Java class as a bean or component so that the component-scanning mechanism of Spring can add it into the application context.

@Controller

The @Controller annotation is used to indicate the class is a Spring controller. This annotation can be used to identify controllers for Spring MVC or Spring WebFlux.

@Service

This annotation is used on a class. @Service marks a Java class that performs some service, such as executing business logic, performing calculations, and calling external APIs. This annotation is a specialized form of the@Component annotation intended to be used in the service layer.

@Repository

This annotation is used on Java classes that directly access the database. The @Repository annotation works as a marker for any class that fulfills the role of repository or Data Access Object.

This annotation has an automatic translation feature. For example, when an exception occurs in the @Repository, there is a handler for that exception and there is no need to add a try-catch block.

Spring Boot Annotations @EnableAutoConfiguration

This annotation is usually placed on the main application class. The @EnableAutoConfiguration annotation implicitly defines a base “search package”. This annotation tells Spring Boot to start adding beans based on classpath settings, other beans, and various property settings.

@SpringBootApplication

This annotation is used on the application class while setting up a Spring Boot project. The class that is annotated with the @SpringBootApplication must be kept in the base package. The one thing that the@SpringBootApplication does is a component scan. But it will scan only its sub-packages. As an example, if you put the class annotated with @SpringBootApplication in com.example, then @SpringBootApplication will scan all its sub-packages, such as com.example.a, com.example.b, and com.example.a.x.

The @SpringBootApplication is a convenient annotation that adds all the following:

@Configuration

@EnableAutoConfiguration

@ComponentScan

Spring MVC and REST Annotations @Controller

This annotation is used on Java classes that play the role of controller in your application. The @Controller annotation allows autodetection of component classes in the classpath and auto-registering bean definitions for them. To enable autodetection of such annotated controllers, you can add component scanning to your configuration. The Java class annotated with @Controller is capable of handling multiple request mappings.

This annotation can be used with Spring MVC and Spring WebFlux.

@RequestMapping

This annotation is used at both the class and method level. The @RequestMapping annotation is used to map web requests onto specific handler classes and handler methods. When @RequestMapping is used on the class level, it creates a base URI for which the controller will be used. When this annotation is used on methods, it will give you the URI on which the handler methods will be executed. From this, you can infer that the class level request mapping will remain the same whereas each handler method will have their own request mapping.

Sometimes you may want to perform different operations based on the HTTP method used, even though the request URI may remain the same. In such situations, you can use the method attribute of @RequestMapping with an HTTP method value to narrow down the HTTP methods in order to invoke the methods of your class.

Here is a basic example of how a controller along with request mappings work:

@Controller @RequestMapping("/welcome") public class WelcomeController { @RequestMapping(method = RequestMethod.GET) public String welcomeAll() { return "welcome all"; } }

In this example, only GET requests to /welcome is handled by the welcomeAll() method.

This annotation also can be used with Spring MVC and Spring WebFlux.

The @RequestMapping annotation is very versatile. Please see my in-depth post on Request Mapping here.

@CookieValue

This annotation is used at method parameter level. @CookieValue is used as an argument of a request mapping method. The HTTP cookie is bound to the @CookieValue parameter for a given cookie name. This annotation is used in the method annotated with @RequestMapping.Let us consider that the following cookie value is received with an HTTP request:

JSESSIONID=418AB76CD83EF94U85YD34W

To get the value of the cookie, use @CookieValue like this:

@ReuestMapping("/cookieValue") public void getCookieValue(@CookieValue "JSESSIONID" String cookie){ } @CrossOrigin

This annotation is used both at the class and method levels to enable cross-origin requests. In many cases, the host that serves JavaScript will be different from the host that serves the data. In such a case, Cross Origin Resource Sharing (CORS) enables cross-domain communication. To enable this communication, you just need to add the @CrossOrigin annotation.

By default, the @CrossOrigin annotation allows all origin, all headers, the HTTP methods specified in the@RequestMapping annotation, and a maxAge of 30 min. You can customize the behavior by specifying the corresponding attribute values.

An example of using @CrossOrigin at both the controller and handler method levels is below:

@CrossOrigin(maxAge = 3600) @RestController @RequestMapping("/account") public class AccountController { @CrossOrigin(origins = "http://example.com") @RequestMapping("/message") public Message getMessage() { // ... } @RequestMapping("/note") public Note getNote() { // ... } }

In this example, both the getExample() and getNote() methods will have a maxAge of 3600 seconds. Also, getExample() will only allow cross-origin requests from http://example.com, while getNote() will allow cross-origin requests from all hosts.

Composed @RequestMapping Variants

Spring framework 4.3 introduced the following method-level variants of @RequestMapping annotation to better express the semantics of the annotated methods. Using these annotations has become the standard ays of defining the endpoints. They act as wrappers to @RequestMapping.

These annotations can be used with Spring MVC and Spring WebFlux.

@GetMapping

This annotation is used for mapping HTTP GET requests onto specific handler methods. @GetMapping is a composed annotation that acts as a shortcut for @RequestMapping(method = RequestMethod.GET).

@PostMapping

This annotation is used for mapping HTTP POST requests onto specific handler methods. @PostMapping is a composed annotation that acts as a shortcut for @RequestMapping(method = RequestMethod.POST).

@PutMapping

This annotation is used for mapping HTTP PUT requests onto specific handler methods. @PutMapping is a composed annotation that acts as a shortcut for @RequestMapping(method = RequestMethod.PUT).

@PatchMapping

This annotation is used for mapping HTTP PATCH requests onto specific handler methods. @PatchMapping is a composed annotation that acts as a shortcut for @RequestMapping(method = RequestMethod.PATCH).

@DeleteMapping

This annotation is used for mapping HTTP DELETE requests onto specific handler methods. @DeleteMapping is a composed annotation that acts as a shortcut for @RequestMapping(method = RequestMethod.DELETE).

@ExceptionHandler

This annotation is used at method levels to handle exceptions at the controller level. The @ExceptionHandler annotation is used to define the class of exception it will catch. You can use this annotation on methods that should be invoked to handle an exception. The @ExceptionHandler values can be set to an array of Exception types. If an exception is thrown that matches one of the types in the list, then the method annotated with the matching @ExceptionHandler will be invoked.

@InitBinder

This annotation is a method-level annotation that plays the role of identifying the methods that initialize theWebDataBinder — a DataBinder that binds the request parameter to JavaBean objects. To customize request parameter data binding, you can use @InitBinder annotated methods within our controller. The methods annotated with @InitBinder includes all argument types that handler methods support.

The @InitBinder annotated methods will get called for each HTTP request if you don’t specify the value element of this annotation. The value element can be a single or multiple form names or request parameters that the init binder method is applied to.

@Mappings and @Mapping

This annotation is used on fields. The @Mapping annotation is a meta-annotation that indicates a web mapping annotation. When mapping different field names, you need to configure the source field to its target field, and to do that, you have to add the @Mappings annotation. This annotation accepts an array of @Mapping having the source and the target fields.

@MatrixVariable

This annotation is used to annotate request handler method arguments so that Spring can inject the relevant bits of a matrix URI. Matrix variables can appear on any segment each separated by a semicolon. If a URL contains matrix variables, the request mapping pattern must represent them with a URI template. The @MatrixVariable annotation ensures that the request is matched with the correct matrix variables of the URI.

@PathVariable

This annotation is used to annotate request handler method arguments. The @RequestMapping annotation can be used to handle dynamic changes in the URI where a certain URI value acts as a parameter. You can specify this parameter using a regular expression. The @PathVariable annotation can be used declare this parameter.

@RequestAttribute

This annotation is used to bind the request attribute to a handler method parameter. Spring retrieves the named attribute's value to populate the parameter annotated with @RequestAttribute. While the @RequestParamannotation is used bind the parameter values from a query string, @RequestAttribute is used to access the objects that have been populated on the server side.

@RequestBody

This annotation is used to annotate request handler method arguments. The @RequestBody annotation indicates that a method parameter should be bound to the value of the HTTP request body. The HttpMessageConveter is responsible for converting from the HTTP request message to object.

@RequestHeader

This annotation is used to annotate request handler method arguments. The @RequestHeader annotation is used to map controller parameter to request header value. When Spring maps the request, @RequestHeader checks the header with the name specified within the annotation and binds its value to the handler method parameter. This annotation helps you to get the header details within the controller class.

@RequestParam

This annotation is used to annotate request handler method arguments. Sometimes you get the parameters in the request URL, mostly in GET requests. In that case, along with the @RequestMapping annotation, you can use the @RequestParam annotation to retrieve the URL parameter and map it to the method argument. The@RequestParam annotation is used to bind request parameters to a method parameter in your controller.

@RequestPart

This annotation is used to annotate request handler method arguments. The @RequestPart annotation can be used instead of @RequestParam to get the content of a specific multipart and bind it to the method argument annotated with @RequestPart. This annotation takes into consideration the “Content-Type” header in the multipart (request part).

@ResponseBody

This annotation is used to annotate request handler methods. The @ResponseBody annotation is similar to the@RequestBody annotation. The @ResponseBody annotation indicates that the result type should be written straight in the response body in whatever format you specify like JSON or XML. Spring converts the returned object into a response body by using the HttpMessageConveter.

@ResponseStatus

This annotation is used on methods and exception classes. @ResponseStatus marks a method or exception class with a status code and a reason that must be returned. When the handler method is invoked the status code is set to the HTTP response which overrides the status information provided by any other means. A controller class can also be annotated with @ResponseStatus, which is then inherited by all @RequestMapping methods.

@ControllerAdvice

This annotation is applied at the class level. As explained earlier, for each controller, you can use @ExceptionHandler on a method that will be called when a given exception occurs. But this handles only those exceptions that occur within the controller in which it is defined. To overcome this problem, you can now use the@ControllerAdvice annotation. This annotation is used to define @ExceptionHandler, @InitBinder, and @ModelAttribute methods that apply to all @RequestMapping methods. Thus, if you define the @ExceptionHandler annotation on a method in a @ControllerAdvice class, it will be applied to all the controllers.

@RestController

This annotation is used at the class level. The @RestController annotation marks the class as a controller where every method returns a domain object instead of a view. By annotating a class with this annotation, you no longer need to add @ResponseBody to all the RequestMapping methods. It means that you no long use view-resolvers or send HTML in response. You just send the domain object as an HTTP response in the format that is understood by the consumers, like JSON.

@RestController is a convenience annotation that combines @Controller and @ResponseBody.

@RestControllerAdvice

This annotation is applied to Java classes. @RestControllerAdvice is a convenience annotation that combines @ControllerAdvice and @ResponseBody. This annotation is used along with the @ExceptionHandler annotation to handle exceptions that occur within the controller.

@SessionAttribute

This annotation is used at method parameter level. The @SessionAttribute annotation is used to bind the method parameter to a session attribute. This annotation provides a convenient access to the existing or permanent session attributes.

@SessionAttributes

This annotation is applied at the type level for a specific handler. The @SessionAtrributes annotation is used when you want to add a JavaBean object into a session. This is used when you want to keep the object in session for short lived. @SessionAttributes is used in conjunction with @ModelAttribute.

Consider this example:

@ModelAttribute("person") public Person getPerson() {} // within the same controller as above snippet @Controller @SeesionAttributes(value = "person", types = { Person.class }) public class PersonController {}

The @ModelAttribute name is assigned to the @SessionAttributes as a value. The @SessionAttributes has two elements. The value element is the name of the session in the model and the types element is the type of session attributes in the model.

Spring Cloud Annotations @EnableConfigServer

This annotation is used at the class level. When developing a project with a number of services, you need to have a centralized and straightforward manner to configure and retrieve the configurations of all the services that you are going to develop. One advantage of using a centralized config server is that you don’t need to carry the burden of remembering where each configuration is distributed across multiple and distributed components.

You can use Spring Cloud’s @EnableConfigServer annotation to start a config server that the other applications can talk to.

@EnableEurekaServer

This annotation is applied to Java classes. One problem that you may encounter while decomposing your application into microservices is that it becomes difficult for every service to know the address of every other service it depends on. There comes the discovery service which is responsible for tracking the locations of all other microservices.

Netflix’s Eureka is an implementation of a discovery server and integration is provided by Spring Boot. Spring Boot has made it easy to design a Eureka Server by just annotating the entry class with @EnableEurekaServer.

@EnableDiscoveryClient

This annotation is applied to Java classes. In order to tell any application to register itself with Eureka, you just need to add the @EnableDiscoveryClientannotation to the application entry point. The application that’s now registered with Eureka uses the Spring Cloud Discovery Client abstraction to interrogate the registry for its own host and port.

@EnableCircuitBreaker

This annotation is applied to Java classes that can act as the circuit breaker. The circuit breaker pattern can allow a microservice continue working when a related service fails, preventing the failure from cascading. This also gives the failed service a time to recover.

The class annotated with @EnableCircuitBreaker will monitor, open, and close the circuit breaker.

@HystrixCommand

This annotation is used at the method level. Netflix’s Hystrix library provides the implementation of a Circuit Breaker pattern. When you apply the circuit breaker to a method, Hystrix watches for the failures of the method. Once failures build up to a threshold, Hystrix opens the circuit so that the subsequent calls also fail. Now Hystrix redirects calls to the method, and they are passed to the specified fallback methods.

Hystrix looks for any method annotated with the @HystrixCommand annotation and wraps it into a proxy connected to a circuit breaker so that Hystrix can monitor it.

Consider the following example:

@Service public class BookService { private final RestTemplate restTemplate; public BookService(RestTemplate rest) { this.restTemplate = rest; } @HystrixCommand(fallbackMethod = "newList") public String bookList() { URI uri = URI.create("http://localhost:8081/recommended"); return this.restTemplate.getForObject(uri, String.class); } public String newList() { return "Cloud native Java"; } }

Here @HystrixCommand is applied to the original method bookList(). The @HystrixCommand annotation has newList as the fallback method. So for some reason, if Hystrix opens the circuit on bookList(), you will have a placeholder book list ready for the users.

Spring Framework DataAccess Annotations @Transactional

This annotation is placed before an interface definition, a method on an interface, a class definition, or a public method on a class. The mere presence of @Transactional is not enough to activate the transactional behavior. The @Transactional is simply metadata that can be consumed by some runtime infrastructure. This infrastructure uses the metadata to configure the appropriate beans with transactional behavior.

The annotation further supports configuration like:

The Propagation type of the transaction

The Isolation level of the transaction

A timeout for the operation wrapped by the transaction

A read-only flag — a hint for the persistence provider that the transaction must be read onlyThe rollback rules for the transaction

Cache-Based Annotations @Cacheable

This annotation is used on methods. The simplest way of enabling the cache behavior for a method is to annotate it with @Cacheable and parameterize it with the name of the cache where the results would be stored.

@Cacheable("addresses") public String getAddress(Book book){...}

In the snippet above, the method getAddress is associated with the cache named addresses. Each time the method is called, the cache is checked to see whether the invocation has been already executed and does not have to be repeated.

@CachePut

This annotation is used on methods. Whenever you need to update the cache without interfering the method execution, you can use the @CachePut annotation. That is, the method will always be executed and the result cached.

@CachePut("addresses") public String getAddress(Book book){...}

Using @CachePut and @Cacheable on the same method is strongly discouraged, as the former forces the execution in order to execute a cache update, the latter causes the method execution to be skipped by using the cache.

@CacheEvict

This annotation is used on methods. It is not that you always want to populate the cache with more and more data. Sometimes, you may want to remove some cache data so that you can populate the cache with some fresh values. In such a case, use the @CacheEvict annotation.

@CacheEvict(value="addresses", allEntries="true") public String getAddress(Book book){...}

Here, an additional element, allEntries, is used along with the cache name to be emptied. It is set to true so that it clears all values and prepares to hold new data.

@CacheConfig

This annotation is a class level annotation. The @CacheConfig annotation helps to streamline some of the cache information at one place. Placing this annotation on a class does not turn on any caching operation. This allows you to store the cache configuration at the class level so that you don’t have to declare things multiple times.

Task Execution and Scheduling Annotations @Scheduled

This annotation is a method-level annotation. The @Scheduled annotation is used on methods along with the trigger metadata. A method with @Scheduled should have a void return type and should not accept any parameters.

There are different ways of using the @Scheduled annotation:

@Scheduled(fixedDelay=5000) public void doSomething() { // something that should execute periodically }

In this case, the duration between the end of the last execution and the start of the next execution is fixed. The tasks always wait until the previous one is finished.

@Scheduled(fixedRate=5000) public void doSomething() { // something that should execute periodically }

In this case, the beginning of the task execution does not wait for the completion of the previous execution.

@Scheduled(initialDelay=1000,fixedRate=5000) public void doSomething() { // something that should execute periodically after an initial delay }

The task gets executed initially with a delay and then continues with the specified fixed rate.

@Async

This annotation is used on methods to execute each method in a separate thread. The @Async annotation is provided on a method so that the invocation of that method will occur asynchronously. Unlike methods annotated with @Scheduled, the methods annotated with @Async can take arguments. They will be invoked in the normal way by callers at runtime rather than by a scheduled task.

@Async can be used with both void return type methods and methods that return a value. However, methods with return values must have a Future-typed return value.

Spring Framework Testing Annotations @BootstrapWith

This annotation is a class-level annotation. The @BootstrapWith annotation is used to configure how the Spring TestContext Framework is bootstrapped. This annotation is used as a metadata to create custom composed annotations and reduce the configuration duplication in a test suite.

@ContextConfiguration

This annotation is a class level annotation that defines a metadata used to determine which configuration files to use to the load the ApplicationContext for your test. More specifically @ContextConfiguration declares the annotated classes that will be used to load the context. You can also tell Spring where to locate the file.

@ContextConfiguration(locations={"example/test-context.xml", loader = Custom ContextLoader.class}) @WebAppConfiguration

This annotation is a class level annotation. The @WebAppConfiguration is used to declare that the ApplicationContext loaded for an integration test should be a WebApplicationContext. This annotation is used to create the web version of the application context. It is important to note that this annotation must be used with the @ContextConfiguration annotation. The default path to the root of the web application is src/main/webapp. You can override it by passing a different path to the <span class="theme:classic lang:default decode:true crayon-inline">@WebAppConfiguration.

@Timed

This annotation is used on methods. The @Timed annotation indicates that the annotated test method must finish its execution at the specified time period (in milliseconds). If the execution exceeds the specified time in the annotation, the test fails.

@Timed(millis=10000) public void testLongRunningProcess() { ... }

In this example, the test will fail if it exceeds 10 seconds of execution.

@Repeat

This annotation is used on test methods. If you want to run a test method several times in a row automatically, you can use the @Repeat annotation. The number of times that test method is to be executed is specified in the annotation.

@Repeat(10) @Test public void testProcessRepeatedly() { ... }

In this example, the test will be executed 10 times.

@Commit

This annotation can be used as both class-level or method-level annotation. After execution of a test method, the transaction of the transactional test method can be committed using the @Commit annotation. This annotation explicitly conveys the intent of the code. When used at the class level, this annotation defines the commit for all test methods within the class. When declared as a method level annotation, @Commit specifies the commit for specific test methods overriding the class level commit.

@RollBack

This annotation can be used as both class-level and method-level annotation. The @RollBack annotation indicates whether the transaction of a transactional test method must be rolled back after the test completes its execution. If this true, @Rollback(true), the transaction is rolled back. Otherwise, the transaction is committed. @Commit is used instead of @RollBack(false).

When used at the class level, this annotation defines the rollback for all test methods within the class.

When declared as a method level annotation, @RollBack specifies the rollback for specific test methods overriding the class level rollback semantics.

@DirtiesContext

This annotation is used as both class-level and method-level annotation. @DirtiesContext indicates that the Spring ApplicationContext has been modified or corrupted in some manner and it should be closed. This will trigger the context reloading before execution of next test. The ApplicationContext is marked as dirty before or after any such annotated method as well as before or after current test class.

The @DirtiesContext annotation supports BEFORE_METHOD, BEFORE_CLASS, and BEFORE_EACH_TEST_METHOD modes for closing the ApplicationContext before a test.

NOTE: Avoid overusing this annotation. It is an expensive operation and if abused, it can really slow down your test suite.

@BeforeTransaction

This annotation is used to annotate void methods in the test class. @BeforeTransaction annotated methods indicate that they should be executed before any transaction starts executing. That means the method annotated with @BeforeTransaction must be executed before any method annotated with @Transactional.

@AfterTransaction

This annotation is used to annotate void methods in the test class. @AfterTransaction annotated methods indicate that they should be executed after a transaction ends for test methods. That means the method annotated with @AfterTransaction must be executed after the method annotated with @Transactional.

@Sql

This annotation can be declared on a test class or test method to run SQL scripts against a database. The @Sql annotation configures the resource path to SQL scripts that should be executed against a given database either before or after an integration test method. When @Sql is used at the method level it, will override any @Sqldefined in at class level.

@SqlConfig

This annotation is used along with the @Sql annotation. The @SqlConfig annotation defines the metadata that is used to determine how to parse and execute SQL scripts configured via the @Sql annotation. When used at the class level, this annotation serves as global configuration for all SQL scripts within the test class. But when used directly with the config attribute of @Sql, @SqlConfig serves as a local configuration for SQL scripts declared.

@SqlGroup

This annotation is used on methods. The @SqlGroup annotation is a container annotation that can hold several@Sql annotations. This annotation can declare nested @Sql annotations.In addition, @SqlGroup is used as a meta-annotation to create custom composed annotations. This annotation can also be used along with repeatable annotations, where @Sql can be declared several times on the same method or class.

@SpringBootTest

This annotation is used to start the Spring context for integration tests. This will bring up the full autoconfigruation context.

@DataJpaTest

The @DataJpaTest annotation will only provide the autoconfiguration required to test Spring Data JPA using an in-memory database such as H2.

This annotation is used instead of @SpringBootTest

@DataMongoTest

The @DataMongoTest will provide a minimal autoconfiguration and an embedded MongoDB for running integration tests with Spring Data MongoDB.

@WebMVCTest

The @WebMVCTest will bring up a mock servlet context for testing the MVC layer. Services and components are not loaded into the context. To provide these dependencies for testing, the @MockBean annotation is typically used.

@AutoConfigureMockMVC

The @AutoConfigureMockMVC annotation works very similarly to the @WebMVCTest annotation, but the full Spring Boot context is started.

@MockBean

Creates and injects a Mockito Mock for the given dependency.

@JsonTest

Will limit the auto-configuration of Spring Boot to components relevant to processing JSON.

This annotation will also autoconfigure an instance of JacksonTester or GsonTester.

@TestPropertySource

Class level annotation used to specify property sources for the test class.

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TIA [3 Certification Exam(s) ]
Tibco [18 Certification Exam(s) ]
Trainers [3 Certification Exam(s) ]
Trend [1 Certification Exam(s) ]
TruSecure [1 Certification Exam(s) ]
USMLE [1 Certification Exam(s) ]
VCE [6 Certification Exam(s) ]
Veeam [2 Certification Exam(s) ]
Veritas [33 Certification Exam(s) ]
Vmware [58 Certification Exam(s) ]
Wonderlic [2 Certification Exam(s) ]
Worldatwork [2 Certification Exam(s) ]
XML-Master [3 Certification Exam(s) ]
Zend [6 Certification Exam(s) ]

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References :

Box.net : https://app.box.com/s/rf1u1rzjm9qdbx2hwnco1onhurm43u1m
zoho.com : https://docs.zoho.com/file/67jzbdd0c24ce8c5744dba45d9bbe8aba8d0d