Hasmap.put,get infinite loop, 27.6 optimizer problem
Helo,
We have a very busy (3000 users) Weblogic Portal and Weblogic Integration instance.
We found that some times (once a week) weblogic server threads go to infinite loop doing hasmap.get, hashmap put or hashmap remove operations.
Our developers found that there are synchronization problems with hashmap operations in the portal and wli code, (in 5 classes until today) they patched (synchronized) it and now the instances are stable.
We contacted oracle support, but they only recommended us some wlw.. setting, none of them worked.
The strange thing that the code that we patched is existed in weblogic server for years, so I tried to exclude the hasmap class from the optimizer in jrockit.opt file. Now the instances are also stable without the inhouse patches.
So I suspect theh the jrockit optimizer optimize the hasmap class after some time in a wrong way; how can I find some evidence about it?
The thead dumps showing only the hasmap operations and very high cpu usage.
We are on Jrockit 27.6, JVM 1.5, Portal and WLI 9.2MP3
Regards,
LJ
Not sure if it is relevant to the issues you describe in this thread, but a common problem with HashMaps is incorrect (missing) synchronization on concurrent operations. If you do have several threads concurrently accessing a HashMap without synchronization, it might mess up the internal data structures in the HashMap object. This can lead to infiinite loops when trying to iterate through the HashMap at some later time. This problem is not JVM-specific but changes in timing due to different JVM versions, JIT compilation/optimization or different HW etc can cause a previous "stable" program to become "unstable".
I've seen a number of JRockit support issues related to this problem over the years, and in almost all cases it's been a problem in the Java code (which could be WLS, or the user application).
Unfortunately it's far from trivial to troubleshoot concurrency issues. One (slow) way of checking your own code is to wrap all HashMaps in a SynchronizedMap. This will slow down your application but if the problem goes away then it's a good indication of the root cause. Not very useful if the problem is in 3rd party code that you don't have the source for, of course. In that case you have to open a ticket with the vendor (Oracle or other 3rd party).
Cheers,
Henrik
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You might be able to fix it, but if not then you'd better ring Apple to get your iMac repaired.
Message was edited by: chazdaspaz
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