Here are a few title options that fit the ask: Direct and Clear: * How to Inject Dependencies into Self-Instantiated Objects in Spring? * Spring Dependency Injection: Autowiring Objects Outside the

Injecting Dependencies into Self-Instantiated Objects with Spring

In Spring development, it may arise where dependencies need to be injected into an object that was instantiated outside of the Spring application context. Unlike Google Guice, which offers an injectMembers method, Spring requires a more nuanced approach.

Autowiring Dependencies

To manually inject dependencies into a self-instantiated object in Spring, you can utilize the autowireBean method provided by the AutowireCapableBeanFactory. This method allows you to pass an arbitrary object to Spring, which will then apply autowiring functionality and inject any configured dependencies.

Implementation

To use this method, follow these steps:

1. Autowire the AutowireCapableBeanFactory into your bean.
2. Instantiate the target object outside of the Spring context.
3. Call beanFactory.autowireBean(obj) to inject dependencies.

Example

Consider the following code:

<code class="java">@Autowired
private AutowireCapableBeanFactory beanFactory;

public void doStuff() {
   MyBean obj = new MyBean();
   beanFactory.autowireBean(obj);
   // obj now has its dependencies autowired.
}</code>

In this example, MyBean is instantiated manually but will still receive injected dependencies through the autowireBean method.

Note: It is important to ensure that the target object adheres to Spring bean conventions, including proper class naming and the presence of appropriate annotations (e.g., @Component or @Autowired) for dependency injection to work correctly.

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