Fetch only first N lines of a Stack Trace

Question

I have a Factory method that returns an object from a ID call.

Mock code:

public static Object getById(String id) {
    Object o = CRUD.doRecovery(Class, id);
    if(o == null) {
         printLogMessage("recovery by ID returned Null: " + id);
         // would really like to show only a few lines of stack trace.
    }
    return o;
}

How can I show only the first N lines of the stack trace (so I know the caller of the method) without dumping the whole stack trace on the log or having to rely on external libs?

Answer 1

You can use the ex.getStackTrace() to get the stack elements, the StackTraceElement contains one line of the full stacks, then print print what ever you want.

StackTraceElement[] elements = ex.getStackTrace();
print(elements[0]);