@ImportTestcontainers doesn't work with AOT

[nosan]

#42875

Since Bean's InstanceSupplier cannot be used during the AOT process, I added BeanRegistrationAotProcessor to replace it.

If a container's field is inaccessible, the generated code will be:

@Generated
public class GraalmavenApplicationTests__TestContext001_BeanDefinitions {

	/**
	 * Get the bean instance for 'importTestContainer.task.graalmaven.GraalmavenApplicationTests.mongoDbContainer'.
	 */
	private static MongoDBContainer getMongoDbContainerInstance() {
		try {
			Class<?> clazz = ClassUtils.forName("task.graalmaven.GraalmavenApplicationTests",
					GraalmavenApplicationTests__TestContext001_BeanDefinitions.class.getClassLoader());
			Field field = ReflectionUtils.findField(clazz, "mongoDbContainer");
			Assert.notNull(field, "Field 'mongoDbContainer' is not found");
			ReflectionUtils.makeAccessible(field);
			Object container = ReflectionUtils.getField(field, null);
			Assert.notNull(container, "Container field 'mongoDbContainer' must not have a null value");
			return (MongoDBContainer) container;
		} catch (ClassNotFoundException ex) {
			throw new RuntimeException(ex);
		}
	}

	/**
	 * Get the bean definition for 'mongoDbContainer'.
	 */
	public static BeanDefinition getMongoDbContainerBeanDefinition() {
		RootBeanDefinition beanDefinition = new RootBeanDefinition(MongoDBContainer.class);
		beanDefinition.setRole(BeanDefinition.ROLE_INFRASTRUCTURE);
		beanDefinition.setInstanceSupplier(
				GraalmavenApplicationTests__TestContext001_BeanDefinitions::getMongoDbContainerInstance);
		return beanDefinition;
	}

}

If a container's field is accessible, the generated code will be:

@Generated
public class GraalmavenApplicationTests__TestContext001_BeanDefinitions {
  /**
   * Get the bean definition for 'mongoDbContainer'.
   */
  public static BeanDefinition getMongoDbContainerBeanDefinition() {
    RootBeanDefinition beanDefinition = new RootBeanDefinition(MyContainer.class);
    beanDefinition.setRole(BeanDefinition.ROLE_INFRASTRUCTURE);
    beanDefinition.setInstanceSupplier(() -> GraalmavenApplicationTests.mongoDbContainer);
    return beanDefinition;
  }
}

An alternative way is FactoryBean instead of InstanceSupplier.

The target branch is 3.2.x

[nosan]

Unfortunately, handling the bean instance supplier for container fields only addresses
half of the issue. The more problematic part involves handling @DynamicPropertySource
methods. These @DynamicPropertySource methods need to be generated and invoked within
the AOT environment. To achieve this, I introduced
DynamicPropertySourceBeanFactoryInitializationAotProcessor

[nosan]

@philwebb
Could I kindly ask you to do a quick review of this PR, and let me know if I'm in the right direction?

[philwebb]

Sorry for the delay @nosan, I haven't had the chance to look in detail at this one yet.

[nosan]

@philwebb
No worries! I completely understand that you’ve been focusing on higher-priority tasks.