How do I debug exceptions in Java?

I'm getting a NullPointerException in my Java code. How can I debug it?

A NullPointerException usually means you're trying to use an object reference that hasn't been initialized. Check your code for any variables that might be null.

I see. But how do I find out which variable is null?

You can use a debugger to step through your code line by line, or add print statements to log the values of your variables before the exception occurs.

What if I can't use a debugger? Any other tips?

You can also check the stack trace of the exception. It will show you the line number where the exception occurred, which can help you identify the problematic variable.