Build: NetBeans IDE Dev (Build 20131125-d473cd33358e)
VM: Java HotSpot(TM) 64-Bit Server VM, 25.0-b49, Java(TM) SE Runtime Environment, 1.8.0-ea-b107
OS: Windows 7

User Comments:
jiriprox: NPE when editing following code:

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

package javaapplication224;

import static javaapplication224.SubClass.test;
import static javaapplication224.SuperClass.test;
/**
 *
 * @author jprox
 */
public class Hello implements Comparable<Hello>{
    
    int value;
    
    public static void main(String[] args) {
        test();
    }

    public Hello() {
    }

    public Hello(int x) {
        this();
    }

    public Hello(String xx) {
        this(1);
        Comparable<String> c = new Comparable<String>() {

            public int compareTo(String input) {
                if(input > this.) return 1;
                return -1;
            }
        };
        }
    }
    
    
    
}




Stacktrace: 
java.lang.NullPointerException
   at com.sun.tools.javac.code.Types$DescriptorCache.findDescriptorInternal(Types.java:416)
   at com.sun.tools.javac.code.Types$DescriptorCache.get(Types.java:396)
   at com.sun.tools.javac.code.Types.findDescriptorSymbol(Types.java:564)
   at com.sun.tools.javac.comp.Check.checkFunctionalInterface(Check.java:3605)
   at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4405)
   at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4333)