How to solve java lang NullPointerException error

Question

When I run my Java program  it gives me an error on this line   compiler getTask null  null  new DiagnosticCollector lt JavaFileObject gt     null  null  compilationUnits     Error I am getting is   Exception in thread  main  java lang NullPointerException     at AnotherClassLoader loadClass test java 58      at test main test java 30      at Main main Main java 68    Can you please tell me how can I solve this error

User · Answer

Just a shot in the dark since you did not share the compiler initialization code with us   the way you retrieve the compiler causes the issue  Point your JRE to be inside the JDK as unlike jdk  jre does not provide any tools hence  results in NPE

User · Answer

This error occures when you try to refer to a null object instance  I can t tell you what causes this error by your given information  but you can debug it easily in your IDE  I strongly recommend you that use exception handling to avoid unexpected program behavior

User · Answer

A NullPointerException means that one of the variables you are passing is null  but the code tries to use it like it is not   For example  If I do this   Integer myInteger   null  int n   myInteger intValue      The code tries to grab the intValue of myInteger  but since it is null  it does not have one  a null pointer exception happens   What this means is that your getTask method is expecting something that is not a null  but you are passing a null  Figure out what getTask needs and pass what it wants

[java] How to solve java.lang.NullPointerException error?

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