Null Pointer Exception while using Java Compiler API
java, java-compiler-api, nullpointerexception
Solution
I suspect you're running into this problem - running the code with a JRE instead of a JDK.
When you run `SimpleCompileTest`, try explicitly specifying the version of java.exe you're using as the one in your JDK directory.
Problem
MyClass.java: ``` package test; public class MyClass { public void myMethod(){ System.out.println("My Method Called"); } } ``` Listing for SimpleCompileTest.java that compiles the MyClass.java file. SimpleCompileTest.java: ``` package test; import javax.tools.*; public class SimpleCompileTest { public static void main(String[] args) { String fileToCompile = "test" + java.io.File.separator +"MyClass.java"; JavaCompiler compiler = ToolProvider.getSystemJavaCompiler(); int compilationResult = compiler.run(null, null, null, fileToCompile); if(compilationResult == 0){ System.out.println("Compilation is successful"); }else{ System.out.println("Compilation Failed"); } } } ``` I am executing the SimpleCompileTest class and getting a NullPointerException. The ToolProvider.getSystemJavaCompiler() is returning null. Can someone tell me what is wrong with the code