M02 Q05 How many advice types does Spring support?

How many advice types does Spring support?

Spring supports the following advice types:

• @Before – executed before join point matched by pointcut is executed

• @After – executed after join point matched by pointcut is executed

• @AfterThrowing – executed when an exception is thrown from join point matched by pointcut. Throwing field informs us that we want to get the original exception.

• @AfterReturning – executed after join point matched by pointcut is executed successfully without any exception. Returning field says that we want to get the return object.

• @Around – allows you to take full control over join point matched by pointcut, most powerful advice, allows you to implement all advices from above, you need to call ProceedingJoinPoint::proceed() to execute original code and change arguments that are being passed to the original method.

What are they used for?

Some examples of usage for each Advice type:

@Before

• Authorization, Security
• Logging
• Data Validation

@After

• Logging
• Resource Cleanup

@AfterThrowing

• Logging
• Error Handling

@AfterReturning

• Logging
• Data Validation for method result

@Around

• Transactions
• Distributed Call Tracing
• Authorization, Security

Which advices can you use to try and catch exceptions?

To catch exceptions you can use two advices:

• @AfterThrowing with throwing fieldset and exception passed as an argument
• @Around with try … catch block implemented