How to postpone Spring Application Context instantiation

We are first calling the two args application context constructor passing false as a flag:

 ApplicationContext context = new ClassPathXmlApplicationContext( new String[] {"config/myApplicationContext.xml"}, false );

then whenever we are done with our processing we handpick and load the beans we are interested to include:

context.getBeanFactory().registerSingleton("dataSource", myTestDataSource);

finally we initialise manually:

context.refresh();
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