Try catch transaction does not roll

In the spring mechanism, after a transaction is configured, if a try catch catches an exception, because the exception is already caught, the transaction does not roll, resulting in a lot of dirty data.
Workaround:
1. Throws an exception in the catch (throw new RuntimeException (")") and is run-time exception, throwing a normal exception will not roll.
2. If the annotation is configured, then the method of the Try (method) catch can be presented separately as a method, then add the annotation @transactional on this method, then this approach will be rolled,
and exceptions can be captured normally.
Use Try catch reasonably. When refactoring the code, many unreasonable uses are found, resulting in a lot of dirty data, which leads to occasional user protection, but the problem cannot be located.

Try catch transaction does not roll