What is BeanDefinitionRegistry?

public interface BeanDefinitionRegistry extends AliasRegistry. Interface for registries that hold bean definitions, for example RootBeanDefinition and ChildBeanDefinition instances. Typically implemented by BeanFactories that internally work with the AbstractBeanDefinition hierarchy.

What is Defaultlistablebeanfactory?

Default implementation of the ListableBeanFactory and BeanDefinitionRegistry interfaces: a full-fledged bean factory based on bean definition objects. Typical usage is registering all bean definitions first (possibly read from a bean definition file), before accessing beans.

How do you make beans dynamic in spring?

1. Overview. In this tutorial, We will learn about “dynamically register bean with spring” or “dynamically add the bean to spring-context” (at run time).
2. BeanDefinition. BeanDefinition describes a bean instance.
3. GenericBeanDefinition.
4. Dynamically register beans.
5. Unregistering the Bean at run time.
6. Conclusion.

How do you inject beans at runtime in spring?

Inject spring bean dynamically

1. The right implementation will be injected. For example when setting myinterface. type=implB ImplB will be injected where-ever MyInterface is used.
2. Spring Environment should be refreshed with the new values and re-injected as well to beans.

What is BeanFactoryPostProcessor?

BeanFactoryPostProcessor is an interface and beans that implement it are actually beans that undergo the Spring lifecycle (Example below) but these beans don’t take part of the other declared beans’ lifecycle.

What is XmlBeanDefinitionReader?

public class XmlBeanDefinitionReader extends AbstractBeanDefinitionReader. Bean definition reader for XML bean definitions. Delegates the actual XML document reading to an implementation of the BeanDefinitionDocumentReader interface. Typically applied to a DefaultListableBeanFactory or a GenericApplicationContext .

What is AutowireCapableBeanFactory?

public interface AutowireCapableBeanFactory extends BeanFactory. Extension of the BeanFactory interface to be implemented by bean factories that are capable of autowiring, provided that they want to expose this functionality for existing bean instances.

What is a Spring boot Bean?

A bean is an object that is instantiated, assembled, and otherwise managed by a Spring IoC container. Otherwise, a bean is simply one of many objects in your application. Beans, and the dependencies among them, are reflected in the configuration metadata used by a container.

How do I set dynamically Bean property value?

3 Answers

1. Use FactoryBean (as already suggested) to customize instantiation.
2. set scope=”prototype” on the bean, so that each time an instance is required, a new one should be created.
3. In case you want to inject the prototype bean into a singleton bean, use lookup-method (Search for lookup-method here)

What is the difference between Autowired and inject?

@Inject and @Autowired both annotations are used for autowiring in your application. @Inject annotation is part of Java CDI which was introduced in Java 6, whereas @Autowire annotation is part of spring framework. It is a part of Java CDI so it is not dependent on any DI framework. It makes your system loosely coupled.

Which dependency injection is better in Spring?

Use Setter injection when a number of dependencies are more or you need readability. Use Constructor Injection when Object must be created with all of its dependency.

When should I use BeanFactoryPostProcessor?

A bean implementing BeanFactoryPostProcessor is called when all bean definitions will have been loaded, but no beans will have been instantiated yet. This allows for overriding or adding properties even to eager-initializing beans.

How does beandefinitionregistrypostprocessor register more bean definitions?

In particular, BeanDefinitionRegistryPostProcessor may register further bean definitions which in turn define BeanFactoryPostProcessor instances. Creating another config class. This is a sub-interface of BeanFactoryPostProcessor (last example). It allows for the registration of bean definitions.

How to register a bean in spring application?

A Spring application can register a BeanDefinition by using the following method of BeanDefinitionRegistry: void registerBeanDefinition(String beanName, BeanDefinition beanDefinition)

When to call beanfactory postprocessbeanfactory in spring?

BeanFactoryPostProcessor allows client code to customize bean definitions. The method BeanFactoryPostProcessor.postProcessBeanFactory is called by Spring startup process just after all bean definitions have been loaded, but no beans have been instantiated yet.

Which is Bean definition does genericbeandefinition use?

GenericBeanDefinition is a one-stop-shop for standard bean definition purposes. Like any bean definition, it allows for specifying a class plus optionally constructor argument values and property values. Additionally, deriving from a parent bean definition can be flexibly configured through the ” parentName ” property.