Java Null Pointer Exception Stack Trace

The stack trace tells you exactly where the exception happened, providing a line number and a reference to the method or code block. For example, Exception in thread quotmainquot java.lang.NullPointerException at com.example.MyClass.myMethodMyClass.java10 In this example, the exception occurred in MyClass.java at line 10.

java.lang.NullPointerException at com.company.product.MyTest.testMyTest.java37 This stack trace was printed when running the test via Maven's surefire. On the other hand, when running the test in IntelliJ, a different stack trace was printed java.lang.NullPointerException at com.company.product.library.ArgumentChecker.nonNull

Main.mainMain.java5 This points to the offending line in the source code. The JVM uses metadata from the compiled bytecode to correlate the exception with the source code. MOV EAX, str

I see the following message below in the app.log repeatedly and I believe it is also shown to users in a pop up stating quotNullPointerExceptionquot. There is no associated stack trace so I can't work out what is happening - has anyone else seen this? 2018-08-23 120623.572 ERROR http-nio-8080-exec-12 com.haulmont.cuba.web.log.AppLog - Exception java.lang.NullPointerException null

Just look at all the above examples, it's very clear from stack trace what is causing null pointer exception. How to fix NullPointerException. java.lang.NullPointerException is an unchecked exception, so we don't have to catch it. The null pointer exceptions can be prevented using null checks and preventive coding techniques.

Debugging Null Pointer Exceptions A common exception in Java is the Null Pointer Exception. By following a few simple steps, you can quickly narrow down the cause of a Null Pointer Exception NPE, often to the exact spot in the code. Reading the Stack Trace The stack trace will tell you on which line of the program the problem occurred.

MethodsTools to Determine and Prevent NullPointerException 1. Understand the Stack Trace. When a NullPointerException is thrown, the JVM provides a stack trace pointing to the exact line where the exception occurred. Examine the line and identify the expression that evaluates to null. Example Stack Trace

The system's exception logging mechanism might be compromised. The exception is being caught and re-thrown without adding original stack trace information. Daemon threads throwing exceptions may not have a stack trace reported in certain configurations. Using a JRE version or logging framework that does not properly handle stack traces. Solutions

The starting point of the investigation phase would often be your application logs and the the exception's corresponding stack trace. There's also the possibility that the exception wasn't logged - we like to call these the silent killers of Java applications. java.lang.NullPointerException null at com.sparktale.bugtale.server.app

This can be done by examining the exception stack trace, which provides information about the sequence of method calls that led to the exception. Look for the line number in the stack trace that corresponds to your code and identify the variable or object reference that is null. Related Article Resolving MySQL Connection Issues in Java. 2.