Make sure the program you have written carries the correct logic that you had initially intended. The biggest reason why Null Pointer Exceptions occur is human error. Here are some of the top ways to fix common Null Pointer scenarios: Check Your Code For Manual Errors The exact fix for a Null Pointer Exception depends upon your situation and code. While some integrated development environments (IDEs) warn you if you are accessing a variable before initializing it with some compatible value, most IDEs can not figure this out in complex situations, such as when passing a variable through multiple method calls. How to Fix ErrorĬreating a Null Pointer Exception is easy, but avoiding or fixing it is tricky. Due to the exception being thrown, the JVM cannot execute any statements after this. This is where a NullPointerException gets thrown. When the sb.append() lines are executed, sb does not point to any object in reality, rather it points to null. As you can see, we did not initialize an instance of the StringBuilder class while declaring it.
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