SYNOPSIS
--------
Code generated by IDLJ is not thread-safe


OPERATING SYSTEMS
-----------------
All Platforms, but Windows appears to deadlock the testcase more consistently.


FULL JDK VERSIONS
-----------------
All 1.4.2, 5.0, 6 and 7. Note, JDK 7 seems to deadlock much less than 6.


PROBLEM DESCRIPTION
-------------------
Java code generated by IDLJ (%JAVA_HOME%/bin/idlj) from an IDL source has been determined to cause a deadlock. The deadlock occurs when one type is embedded in another, and initialization of these types is attempted (by calling the type() method) concurrently on two or more threads.

Example output:
------------------------------------------------------------------------
Found one Java-level deadlock:
=============================
"Thread-1":
  waiting to lock monitor 0x0afba774 (object 0x070439d0, a java.lang.Class),
  which is held by "Thread-0"
"Thread-0":
  waiting to lock monitor 0x0aff4e0c (object 0x07045d28, a java.lang.Class),
  which is held by "Thread-1"

Java stack information for the threads listed above:
===================================================
"Thread-1":
        at StructAHelper.type(StructAHelper.java:30)
        - waiting to lock <0x070439d0> (a java.lang.Class for StructAHelper)
        at StructBHelper.type(StructBHelper.java:43)
        - locked <0x07045d28> (a java.lang.Class for org.omg.CORBA.TypeCode)
        - locked <0x07044728> (a java.lang.Class for StructBHelper)
        at DeadlockTest.run(DeadlockTest.java:16)
        at java.lang.Thread.run(Thread.java:619)
"Thread-0":
        at StructAHelper.type(StructAHelper.java:34)
        - waiting to lock <0x07045d28> (a java.lang.Class for org.omg.CORBA.TypeCode)
        - locked <0x070439d0> (a java.lang.Class for StructAHelper)
        at DeadlockTest.run(DeadlockTest.java:13)
        at java.lang.Thread.run(Thread.java:619)

Found 1 deadlock.
------------------------------------------------------------------------

TESTCASE SOURCE
---------------
------------------------------------------------------------------------
Deadlock.idl
------------------------------------------------------------------------
struct StructA {
        long a;
};

struct StructB {
        StructA s;
};
------------------------------------------------------------------------

------------------------------------------------------------------------
DeadlockTest.java
------------------------------------------------------------------------
public class DeadlockTest implements Runnable {
    private int selectM;

    public DeadlockTest(int selectM) {
        this.selectM = selectM;
    }

    private DeadlockTest() {};

    public void run() {
        switch ( selectM ) {
        case 0:
            StructAHelper.type();
            break;
        case 1:
            StructBHelper.type();
            break;
        }
    }

    public static void main(String[] args) {
        DeadlockTest d1 = new DeadlockTest(0);
        DeadlockTest d2 = new DeadlockTest(1);
        Thread t1 = new Thread(d1);
        Thread t2 = new Thread(d2);
        t1.start();
        t2.start();
        try {
            System.out.print("Threads started, waiting for completion...");
            t1.join();
            t2.join();
            System.out.println("success");
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}
------------------------------------------------------------------------

REPRODUCTION INSTRUCTIONS
-------------------------
1. Place both testcase files in the same directory
2. Run "idlj Deadlock.idl"
3. Run "javac *.java"
4. Run java DeadlockTest
5. Observe that it will result in deadlock for at least one/two times in
   20 runs.

WORKAROUND
N/A