Grails 3.0.2 Reloading of Java classes doesn't work

[olavgg]

When I save a regular Java class with modifications I get the following error:

Spring Loaded: Cannot reload new version of com.example.Bar
 Reason: Interfaces changed from [] to [groovy/lang/GroovyObject]

This happen also if I just change the method body.

Java class example:

public class Bar {

    public static long sum(long a, long b){
        long sum = a + b;
        return sum;
    }
}

This happen on both Linux and OSX. JDK 7 and 8 and OpenJDK