Intelli J IDEA don't show JAVA error inside a cordova project plugin

Hi all, 

I have a cordova project that have a my own cordova plugin "cordova-plugin-hello-master" .

Inside this plugin I have a file called Hello.java with my android code... but the IDE don't show me error before i try to compile it...

for example here the code:

public class Hello extends CordovaPlugin {
  public static boolean foo(Context context){
       return "bar";
  }
}

This code must show me "Type mismatch" but nothing only when compile....

any advice?

thanks a lot !!