How do I troubleshoot Java exceptions?

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

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

I found a variable that could be null. How do I fix it?

You can add a null check before using the variable. For example: if (myVariable != null) { // use myVariable }.

What if I still get the exception after adding the null check?

If you're still encountering the exception, ensure that all paths leading to the variable assignment are properly initialized. You might also want to use debugging tools to trace the variable's state.

Thanks! Are there other common exceptions I should be aware of?

Yes, some common exceptions include ArrayIndexOutOfBoundsException, ClassCastException, and IOException. Each has its own troubleshooting steps.