A method annotated with Spring’s @Async, @Cacheable or @Transactional annotations will not work as expected
if invoked directly from within its class.
This is because Spring generates a proxy class with wrapper code to manage the method’s asynchronicity (@Async), to cache methods
invocations (@Cacheable), or to handle the transaction (@Transactional). However, when called using this, the
proxy instance is bypassed, and the method is invoked directly without the required wrapper code.
