@Nullable
 protected VirtualFile findClassFile(String className) {
   final CompilerModuleExtension extension =
       ModuleRootManager.getInstance(myModule).getModuleExtension(CompilerModuleExtension.class);
   //noinspection ConstantConditions
   return extension.getCompilerOutputPath().findChild(className + ".class");
 }
 @Nullable
 protected VirtualFile findClassFile(String className, Module module) {
   //noinspection ConstantConditions
   VirtualFile path =
       ModuleRootManager.getInstance(module)
           .getModuleExtension(CompilerModuleExtension.class)
           .getCompilerOutputPath();
   path.getChildren();
   assert path != null;
   path.refresh(false, true);
   return path.findChild(className + ".class");
 }