what is the difference between @component and @bean in spring?
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@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.
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A component is a factory for creating elements. React Element - It is a simple object that describes a DOM node and its attributes or properties you can say. It is an immutable description object and you can not apply any methods on it.
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Hibernate is a JPA implementation, while Spring Data JPA is a JPA Data Access Abstraction. Spring Data offers a solution to GenericDao custom implementations. ... Hibernate provides a reference implementation of the Java Persistence API that makes it a great choice as an ORM tool with benefits of loose coupling.
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1 Answer. @model is used to "import" a model in the view page while the @Model represents the imported model and is where you retrieve its properties. Here you see that @model simply imports the Model object to the page while the @Model you get actual value from the retrieved model.
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7. Which one of the following is not an annotation used by Junit with Junit4? Explanation: @Test, @Before, @BeforeClass, @After, @AfterClass and @Ignores are the annotations used by Junit with Junit4. 8.
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Class XmlBeanFactory Convenience extension of DefaultListableBeanFactory that reads bean definitions from an XML document. ... This class registers each bean definition with the DefaultListableBeanFactory superclass, and relies on the latter's implementation of the BeanFactory interface.
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@Input() and @Output() allow Angular to share data between the parent context and child directives or components. An @Input() property is writable while an @Output() property is observable.
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Both @Service and @Repository annotations are the specializations over the @Component annotation. @Repository is a stereotype used for persistence layer. It translates any persistence related exceptions into a Spring's DataAccessException. @Service is used for the beans at the service layer.
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PureComponent is exactly the same as Component except that it handles the shouldComponentUpdate method for you . When props or state changes, PureComponent will do a shallow comparison on both props and state. Component on the other hand won't compare current props and state to next out of the box.
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Spring is an open-source, light-weight and cross-platform application framework for easy application development as it takes care of infrastructure and developers need to concentrate on business logic whereas Hibernate is an entirely different framework for ORM (object-relational mapping) between Java classes and ...
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Spring AOP is proxy-based. Spring uses either JDK proxies (preferred wheneven the proxied target implements at least one interface) or CGLIB proxies (if the target object does not implement any interfaces) to create the proxy for a given target bean.
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In summation, Spring guarantees exactly one shared bean instance for the given id per IoC container, unlike Java Singletons, where the Singleton hardcodes the scope of an object such that one and only one instance of a particular class will ever be created per ClassLoader.
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Spring singleton beans are NOT thread-safe just because Spring instantiates them. Sorry. Spring just manage the life cycle of singleton bean and maintains single instance of object. Thread safety has nothing to do with it.
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What is the difference between Java and Spring? Java is a programming language, while Spring is an open source application framework. Therefore, they cannot be directly compared. However, Java EE (which is Java's own server programming platform) is often compared against Spring framework.
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8.6 Proxying mechanisms. Spring AOP uses either JDK dynamic proxies or CGLIB to create the proxy for a given target object. (JDK dynamic proxies are preferred whenever you have a choice). If the target object to be proxied implements at least one interface then a JDK dynamic proxy will be used.
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1.1. singleton is default bean scope in spring container. It tells the container to create and manage only one instance of bean class, per container. This single instance is stored in a cache of such singleton beans, and all subsequent requests and references for that named bean return the cached instance.
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If you want to create a JSP with multiple forms, and the forms' fields need to be prepopulated with form bean data before the JSP is loaded and displayed to the user, you need to create the form bean objects and add these to the Forward object that loads the JSP.