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.
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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. Consider the following example where you declare a variable like this:Īs you can see, we did not initialize an instance of the StringBuilder class while declaring it. Null is the default value in Java assigned to the variables which are not initialized by the user after or with a declaration. This indicates that an attempt has been made to access a reference variable that currently points to null. The Null Pointer Exception is one of the several Exceptions supported by the Java language. In this article, we take a look at what is, why does it happen, how you can fix it, and some of the best practices to follow to avoid running into wild null pointers. This issue is not entirely a syntactical error, so it can get tricky to identify the problem at times.
This exception is usually the result of a human error, buttime can get wasted on debugging errors like this one. The Null Pointer Exception is one of the most common errors in Java application development. You must have come across something called a NullPointerException if you have worked on Java-based applications.
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