JCTest.java

package org.foo;

import javax.tools.JavaCompiler;
import javax.tools.JavaFileObject;
import javax.tools.StandardJavaFileManager;
import javax.tools.ToolProvider;
import java.io.File;
import java.util.Arrays;

class JCTest {
  public static void main(String[] args) {
    String javaFile = "/tmp/MyClass.java";
    JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
    StandardJavaFileManager fileManager = compiler.getStandardFileManager(null, null, null);
    Iterable<? extends JavaFileObject> compilationUnits1 =
          fileManager.getJavaFileObjectsFromFiles(Arrays.asList(new File(javaFile)));
    compiler.getTask(null, fileManager, null, null, null, compilationUnits1).call();    
  }
}