There is outer class Actions and its static inner class Add. Actions creates instance of class Add in its static constructor:
private static final Add ADD = new Add ();
Inner class even if static keeps reference to outer class using $assertionsDisabled:Z
When class Actions and its inner class are loaded simultaneously by different thread it causes deadlock.

I will attach 2 thread dumps.
###@###.### 10/4/04 12:28 GMT

Here is a test case. Not able to reproduce it on single processor Linux machine but it happens always on 2 CPU machine with Solaris 9 both with JDK 1.4.2_05 and JDK 1.5.0. I attach new thread dumps for given test case. Test case consists of Main.java and MyOuter.java. Important: assert is necessary in inner class code to generate hidden link to outer class as mentioned above.

Main.java:
package javaapplication1;
 
public class Main {
     
    public Main() {
    }
     
    public static void main(String[] args) {
        Thread t1 = new Thread () {
            public void run() {
                System.out.println("Test thread 1 start th:" + Integer.toHexString(System.identityHashCode(this)));
                try {
                    Class c = Class.forName("javaapplication1.MyOuter");
                    System.out.println("c:" + c);
                } catch (ClassNotFoundException exc) {
                    System.out.println("exc:" + exc);
                }
                System.out.println("Test thread 1 end");
            }
        };
         
        Thread t2 = new Thread () {
            public void run() {
                System.out.println("Test thread 2 start th:" + Integer.toHexString(System.identityHashCode(this)));
                try {
                    Class c = Class.forName("javaapplication1.MyOuter$MyInner");
                    System.out.println("c:" + c);
                } catch (ClassNotFoundException exc) {
                    System.out.println("exc:" + exc);
                }
                System.out.println("Test thread 2 end");
            }
        };
         
        t1.start();
        t2.start();
        try {
            t1.join();
            t2.join();
        } catch (InterruptedException exc) {
            System.out.println("exc:" + exc);
        }
}
     
}

MyOuter.java:
package javaapplication1;
 
public class MyOuter {
     
    private static MyInner A = new MyInner();
     
    public MyOuter () {
        System.out.println("MyOuter constructor");
    }
     
    public static class MyInner {
        public MyInner () {
            System.out.println("MyInner constructor");
        }
         
        public void t () {
            assert(getClass().getName().length() > 20);
        }
    }
     
}
###@###.### 10/11/04 12:16 GMT