Debugging Code Assistant

Based on your provided code snippet and problem description, the NullPointerException is occurring because you're trying to call a method on a null object. In your code, `str` is a static String that isn't initialized, hence it defaults to `null`. When you try to call `toString()` on `str`, a NullPointerException is thrown. Here's how you can resolve the issue: ```java public class Test { private static String str = ""; public static void main(String[] args) { System.out.println(str.toString()); } } ``` In this revised version, `str` is initialized to an empty string `""`. This prevents the NullPointerException as `str` is no longer `null`. If you're still facing issues after initializing `str`, the problem could be elsewhere in your code. Make sure all objects are properly initialized before you attempt to call methods on them. Always remember, a NullPointerException means that an object was not initialized (i.e., it is `null`) and a method or attribute was invoked on that object.