Question

I have a java app that try to insert a row into the table and com.​ibatis.​common.​jdbc.​exception.NestedSQLException is thrown with the Cause com.mysql.jdbc.exceptions.MySQLIntegrityConstraintViolationException
When I try to insert dublicate data for a unique-key constraint.

How do I catch that exception?

Answer 1

To get to the root cause you can do something like this:

try {
    //insert
} catch (NestedSQLException e) {
    Throwable t = e;
    while(t.getCause() != null) {
        t = t.getCause();
    }
    //in your situation, now t should be MySQLIntegrityConstraintViolationException 
    if (t instanceOf MySQLIntegrityConstraintViolationException) {
        //do something
    }
}