How can I get a list of instantiated beans from Spring?

I am not sure whether this will help you or not.

You need to create your own annotation eg. MyAnnot. And place that annotation on the class which you want to get. And then using following code you might get the instantiated bean.

ClassPathScanningCandidateComponentProvider scanner = new ClassPathScanningCandidateComponentProvider(false);
scanner.addIncludeFilter(new AnnotationTypeFilter(MyAnnot.class));
for (BeanDefinition beanDefinition : scanner.findCandidateComponents("com.xxx.yyy")){
    System.out.println(beanDefinition.getBeanClassName());
}

This way you can get all the beans having your custom annotation.

For example:

 public static List<Object> getInstantiatedSigletons(ApplicationContext ctx) {
            List<Object> singletons = new ArrayList<Object>();

            String[] all = ctx.getBeanDefinitionNames();

            ConfigurableListableBeanFactory clbf = ((AbstractApplicationContext) ctx).getBeanFactory();
            for (String name : all) {
                Object s = clbf.getSingleton(name);
                if (s != null)
                    singletons.add(s);
            }

            return singletons;

    }

I had to improve it a little

@Resource
AbstractApplicationContext context;

@After
public void cleanup() {
    resetAllMocks();
}

private void resetAllMocks() {
    ConfigurableListableBeanFactory beanFactory = context.getBeanFactory();
    for (String name : context.getBeanDefinitionNames()) {
        Object bean = beanFactory.getSingleton(name);
        if (Mockito.mockingDetails(bean).isMock()) {
            Mockito.reset(bean);
        }
    }
}