Java Exception Handling Best Practices

Java Exception Handling Best Practices :

1. Never swallow the exception in catch block
2. Declare the specific checked exceptions that your method can throw
3. Do not catch the Exception class rather catch specific sub classes
4. Never catch Throwable class
5. Always correctly wrap the exceptions in custom exceptions so that stack trace is not lost
6. Either log the exception or throw it but never do the both
7. Never throw any exception from finally block
8. Always catch only those exceptions that you can actually handle
9. Don't use printStackTrace() statement or similar methods
10. Use finally blocks instead of catch blocks if you are not going to handle exception
11. Remember "Throw early catch late" principle
12. Always clean up after handling the exception
13. Throw only relevant exception from a method
14. Never use exceptions for flow control in your program
15. Validate user input to catch adverse conditions very early in request processing
16. Always include all information about an exception in single log message
17. Pass all relevant information to exceptions to make them informative as much as possible
18. Always terminate the thread which it is interrupted
19. Use template methods for repeated try-catch
20. Document all exceptions in your application in javadoc