How to handle JPA unique constraint violations?

Question

When a unique constraint is violated, a javax.persistence.RollbackException is thrown. But there could be multiple reasons to throw a RollbackException

Answer 1

You can do like this :

StringWriter writer=new StringWriter(); //remains the message from stack trace.
e.printStackTrace(new PrintWriter(writer));
String message=writer.toString(); // gets the message of full stack trace.

And then view the information of exception.