How to Inject Dependencies into Self-Instantiated Objects in Spring Using AutowireCapableBeanFactory?

Using AutowireCapableBeanFactory to Inject Dependencies in Self-Instantiated Objects

In Spring, you can create objects yourself and inject dependencies into them even after their creation. This is possible through the AutowireCapableBeanFactory class. Let's explore how to achieve this:

Consider the following class:

<code class="java">public class MyClass {
    @Autowired private AnotherBean anotherBean;
}</code>

You can instantiate this class and attempt to manually inject dependencies yourself:

<code class="java">MyClass obj = new MyClass();</code>

However, this approach won't automatically inject the AnotherBean dependency. To address this, you can utilize the autowireBean() method provided by AutowireCapableBeanFactory.

To access AutowireCapableBeanFactory, simply autowire it as a dependency yourself:

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

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

By calling autowireBean(), Spring recognizes the obj instance as if it had created it itself. It then injects the necessary dependencies based on the annotations (e.g., @Autowired) present on the object's properties. In this case, the obj instance will have its AnotherBean dependency autowired.

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