What is context annotation config /

<context:annotation-config> is used to activate annotations in beans already registered in the application context (no matter if they were defined with XML or by package scanning).

What is the use of context annotation config?

<context:annotation-config> is used to activate annotations in beans already registered in the application context (no matter if they were defined with XML or by package scanning).

What is annotation based configuration?

What is Spring Annotation Based Configuration? In Spring Framework annotation-based configuration instead of using XML for describing the bean wiring, you have the choice to move the bean configuration into component class. It is done by using annotations on the relevant class, method or the field declaration.

What is the difference between context annotation config and component scan?

Moreover, <context:component-scan> recognizes bean annotations that <context:annotation-config> doesn’t detect. Basically, <context:component-scan> detects the annotations by package scanning. To put it differently, it tells Spring which packages need to be scanned to look for the annotated beans or components.

What does @required annotation mean?

Advertisements. The @Required annotation applies to bean property setter methods and it indicates that the affected bean property must be populated in XML configuration file at configuration time. Otherwise, the container throws a BeanInitializationException exception.

Which is better annotation or XML in Spring?

Spring used to be heavily configured with XML. It was known as XML hell. Annotations are much cleaner and easier to use. Annotation based config is also the direction the framework is moving.

What is Tx annotation-driven?

tx:annotation-driven element is used to tell Spring context that we are using annotation based transaction management configuration. transaction-manager attribute is used to provide the transaction manager bean name. transaction-manager default value is transactionManager but I am still having it to avoid confusion.

How do I use REF in Spring framework?

In Spring we need to use <ref> element to inform spring container about the object dependency. In Spring, beans can “access” to each other by specify the bean references in the same or different bean configuration file.In spring we can write multiple configuration xml file.

How do I use context component scan in Spring?

Put this “ context:component ” in bean configuration file, it means, enable auto scanning feature in Spring. The base-package is indicate where are your components stored, Spring will scan this folder and find out the bean (annotated with @Component) and register it in Spring container.

What is @component annotation in Spring boot?

@Component is an annotation that allows Spring to automatically detect our custom beans. In other words, without having to write any explicit code, Spring will: Scan our application for classes annotated with @Component. Instantiate them and inject any specified dependencies into them. Inject them wherever needed.

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What is the correct syntax of annotation wiring?

What is the correct syntax for annotation wiring? <annotation-context:config /> to bean configuration.

What does annotation mean in Java?

Java Annotation is a tag that represents the metadata i.e. attached with class, interface, methods or fields to indicate some additional information which can be used by java compiler and JVM.

What is difference between Java based configuration and annotation-based configuration?

They are similar, but have subtle differences. Instead of having an @Component annotation on your class( which is annotation-based configuration ), you can skip the @Component and instead have a @Bean annotated method which returns a new instance of this class. ( this is Java-based configuration).

Is @autowired required?

Is @Autowired annotation mandatory for a constructor? No. After Spring 4.3 If your class has only single constructor then there is no need to put @Autowired .

How do you turn on annotation wiring?

Annotation wiring is not turned on in the Spring container by default. So, before we can use annotation-based wiring, we will need to enable it in our Spring configuration file by configuring <context:annotation-config/>.

What is configuration annotation in spring?

@Configuration annotation indicates that a class declares one or more @Bean methods and may be processed by the Spring container to generate bean definitions and service requests for those beans at runtime. … This is called Spring Java Config feature (using @Configuration annotation).

What is Tx advice?

In-short, <tx:advice> mean what to do or which behavior of transaction we want to apply.

Is it sufficient to annotate @transactional?

However, please note that the mere presence of the @Transactional annotation is not enough to actually turn on the transactional behavior – the @Transactional annotation is simply metadata that can be consumed by something that is @Transactional -aware and that can use the metadata to configure the appropriate beans …

Is it sufficient to annotate the classes with @transactional annotation?

You can place the @Transactional annotation before an interface definition, a method on an interface, a class definition, or a public method on a class. However, the mere presence of the @Transactional annotation is not enough to activate the transactional behavior.

What is difference between XML and annotation in Spring?

Xml configuration is very good to get a bigger picture of application but it maybe cumbersome to find some errors until runtime. In this case Spring @Configuration annotation sounds as a better choice since it let you see a bigger picture as well and also allows to validate configuration on compile time.

What is Java Bean ID?

Every bean has one or more ids (also called identifiers, or names; these terms refer to the same thing). These ids must be unique within the container the bean is hosted in. A bean will almost always have only one id, but if a bean has more than one id, the extra ones can essentially be considered aliases.

Why we use XML in Spring?

I would say that the reason Spring favors XML over Java is that the two languages are for two different tasks. Java is a programming language. Its purpose is to describe algorithms, programs, control flow, etc. If deducing the structure of your program requires complex control flow, Java would be a good choice.

What annotation is used for auto scans?

@ComponentScan annotation enables component scanning in Spring. Java classes that are decorated with stereotypes such as @Component , @Configuration , @Service are auto-detected by Spring. The @ComponentScan’s basePackages attribute specifies which packages should be scanned for decorated beans.

What is the use of annotation-driven in Spring?

mvc:annotation-driven is used for enabling the Spring MVC components with its default configurations. If you dont include mvc:annotation-driven also your MVC application would work if you have used the context:component-scan for creating the beans or defined the beans in your XML file.

On which can the @transactional annotation be applied?

At a high level, Spring creates proxies for all the classes annotated with @Transactional, either on the class or on any of the methods. The proxy allows the framework to inject transactional logic before and after the running method, mainly for starting and committing the transaction.

What is ref attribute in Spring?

Spring ref attribute The ref attribute is a shortcut to the <ref> tag, used to refer to other beans for injection.

What is Ref local in Spring?

<ref bean=”someBean”/> Specifying the target bean by using the local attribute leverages the ability of the XML parser to validate XML id references within the same file. The value of the local attribute must be the same as the id attribute of the target bean.

What is ref in Spring XML?

If you are referring to a bean in different XML file, you can reference it with a ‘ ref ‘ tag, ‘ bean ‘ attribute. … xml ‘ can access to other beans in ‘ Spring-Output. xml ‘ – “CsvOutputGenerator” or “JsonOutputGenerator“, by using a ‘ref’ attribute in property tag.

What is difference between @bean and @component?

@Component is a class level annotation whereas @Bean is a method level annotation and name of the method serves as the bean name. @Component need not to be used with the @Configuration annotation where as @Bean annotation has to be used within the class which is annotated with @Configuration.

What does @repository annotation do?

The @Repository annotation is a marker for any class that fulfils the role or stereotype of a repository (also known as Data Access Object or DAO). Among the uses of this marker is the automatic translation of exceptions, as described in Exception Translation.

What is @bean annotation in spring boot?

Spring @Bean annotation tells that a method produces a bean to be managed by the Spring container. It is a method-level annotation. During Java configuration ( @Configuration ), the method is executed and its return value is registered as a bean within a BeanFactory .