Threading with Java 1.4.2_05-b04??

Question

Hi!
Could some please tell me that what has happened with the threading model on Java 1.4.2?? I mean, I have applications that has been developed with 1.3.1_b24, and everything worked OK. Now that I updated to this newer Java version 1.4.2_05-b04, my applications just don�t seem to work, they crash instantly after the startup without throwing any exceptions. So everything SEEMS to go OK, but in fact nothing works! I used a profiler to solve things out, and noticed that there is a huge amount of deadlocks with my communication threads, and I really can't figure out why!!??
I haven't been able to find any documentation if there really is something new with this Java version. I would expect that if Sun has changed something important concerning threading, my application should not even compile with the new Java. Now anyway, all the code compiles ok, and don't even throw any errors, it just crashes..:=(
Could someone please give me a hint that what's wrong?? Does somebody have same kind of problems with Java 1.4.2??

Answer 1

Hi,
Just as Peter said, you wouldn't need to do any changes at all if your application had been correctly implemented. The deadlocks is probably not a direct cause of the changes in the threading model, but rather a cause due to changes in the behaviour in the program. E.g. execution times could have decreased/increased in some methods, and that exposes a bug in your application. Do you always aquire the locks in the same order in all methods/classes?
/Kaj