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Commit 0fdacba

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Add example for registering an existing object as a singleton bean in Spring Core docs
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‎framework-docs/modules/ROOT/pages/core/beans/definition.adoc

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@@ -63,6 +63,54 @@ supports this registration through the `registerSingleton(..)` and `registerBean
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methods. However, typical applications work solely with beans defined through regular
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bean definition metadata.
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[[beans-factory-register-singleton]]
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=== Registering an Existing Object as a Singleton Bean
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In some cases, you might need to register an object that was created outside of the Spring container as a bean. You can achieve this using the `ConfigurableListableBeanFactory`:
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[source,java]
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----
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import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
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import org.springframework.context.annotation.AnnotationConfigApplicationContext;
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public class DynamicBeanRegistrationExample {
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public static void main(String[] args) {
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AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext();
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// Refresh context (required before accessing BeanFactory)
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context.refresh();
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// Create an object outside Spring
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MyService myService = new MyService("Hello from custom object!");
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// Get BeanFactory and register the object as a singleton bean
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ConfigurableListableBeanFactory beanFactory = context.getBeanFactory();
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beanFactory.registerSingleton("myServiceBean", myService);
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// Retrieve the bean from the context
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MyService bean = context.getBean("myServiceBean", MyService.class);
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System.out.println(bean.getMessage());
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context.close();
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}
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static class MyService {
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private final String message;
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public MyService(String message) {
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this.message = message;
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}
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public String getMessage() {
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return message;
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}
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}
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}
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----
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This approach is useful when integrating legacy code or dynamically adding beans at runtime.
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[NOTE]
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====
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Bean metadata and manually supplied singleton instances need to be registered as early

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