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| mqmhr |
 Posted: Tue Jan 09, 2007 1:28 pm Post subject: Client triggering Java program in HP-UX |
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We have configured a process definition to trigger a java program on the MQ client machine (runmqtmc). Both the MQ server and client are in HP-UX Itanium boxes. When we put a message, the java app is not getting triggered and we are getting the error "Unable to find library 'libjvm.so'.
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I am able to locate the .so in the client and tried specifying the directory name in classpath as well as path, still the triggering wont work. When invoked from the command prompt in the client machine, the java program gets invoked successfully.
Could you please tell me if I am missing something here ? Do we need to set any environment variables specifically for triggering a java program in a client machine in Hp-UX Itanium ? |
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| jefflowrey |
| Posted: Tue Jan 09, 2007 1:39 pm Post subject: |
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| mqmhr |
| Posted: Tue Jan 09, 2007 3:39 pm Post subject: |
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Joined: 28 Dec 2004
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Hello Jeff
Triggering a .sh and invoking java from within it, doesnt seem to work either. The shell script gets triggered but the java app is not getting invoked, with the same error.
When I placed the java app in the server machine and used server trigger monitor runmqtrm, it was triggered successfully. But the issue with runmqtmc still persists. Any pointers ???
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| jefflowrey |
| Posted: Tue Jan 09, 2007 3:56 pm Post subject: |
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The advantage of the shell script is that you can customize it to match the required environment - for example to match the one that is in effect when you successfully run the program from the command prompt - rather than being stuck with the environment that is in effect for runmqtmc.
It sounds like you have replicated your non-working environment into your shell script. This is a good first step - now you can work on fixing the shell script so it sets the environment correctly.
Secondly, when using a client triggered application, you need to configure all the trigger information for the CLIENT MACHINE, and not for the server machine. That means all paths, all libraries, etc must be valid on the CLIENT side.
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| ashly |
| Posted: Tue Jan 09, 2007 5:12 pm Post subject: |
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Joined: 10 Oct 2006
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seems like the JRE is having an issue in loading the jvm dll.
check path/ld_library_path is set correctly. |
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| mqmhr |
| Posted: Tue Jan 09, 2007 6:46 pm Post subject: |
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The path and the library path (tried giving both LD_LIBRARY_PATH and SHLIB_PATH) is set correctly to point to the directory containing jvmlib.so file in the client machine.
Jeff, I mentioned the server triggering to bring out the fact that the problem is occuring only when runmqtmc is trying to invoke the java program.
So now I have a situation where the shell script has all the required environment variables set to the correct values and still, runmqtmc throws the error "Unable to find library jvmlib.so". The java app runs fine when executed from the command prompt of the client machine. |
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| fjb_saper |
| Posted: Tue Jan 09, 2007 7:40 pm Post subject: |
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| mqmhr wrote: |
The path and the library path (tried giving both LD_LIBRARY_PATH and SHLIB_PATH) is set correctly to point to the directory containing jvmlib.so file in the client machine.
Jeff, I mentioned the server triggering to bring out the fact that the problem is occuring only when runmqtmc is trying to invoke the java program.
So now I have a situation where the shell script has all the required environment variables set to the correct values and still, runmqtmc throws the error "Unable to find library jvmlib.so". The java app runs fine when executed from the command prompt of the client machine. |
Read this post about java triggering in a unix environment. Maybe it will clarify a thing or 2.
Enjoy 
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| ashly |
| Posted: Tue Jan 09, 2007 7:45 pm Post subject: |
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| check the user who fires the trigger has it set . that should seal it. |
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| jefflowrey |
| Posted: Wed Jan 10, 2007 2:28 am Post subject: |
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So the shell script runs just fine from the command prompt, when logged in as the same user that starts runmqtmc?
And you still have the same problem when you start runmqtmc manually, from an interactive login prompt while logged in as the same user that starts runmqtmc?
How are you starting runmqtmc?
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| Nigelg |
| Posted: Wed Jan 10, 2007 3:33 am Post subject: |
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| Quote: |
The path and the library path (tried giving both LD_LIBRARY_PATH and SHLIB_PATH) is set correctly to point to the directory containing jvmlib.so file in the client machine.
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These env vars are set to their default values when a process is exec'ed from a setuid/setgid app like runmqtmc. Either install the required lib on the default path, or set the env vars in the triggered shell script before running the java app.
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| mqmhr |
| Posted: Wed Jan 10, 2007 8:32 am Post subject: |
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| jefflowrey wrote: |
And you still have the same problem when you start runmqtmc manually, from an interactive login prompt while logged in as the same user that starts runmqtmc?
How are you starting runmqtmc? |
I am starting runmqtmc from the command prompt in an interactive manner. I am using only one user id in the entire sequence of operations. Still the problem persists.
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| or set the env vars in the triggered shell script before running the java app. |
I have explicitly the environment variables in the shell script, before I call the java program. Still the same error is obtained. |
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| fjb_saper |
| Posted: Wed Jan 10, 2007 5:58 pm Post subject: |
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| mqmhr wrote: |
I have explicitly the environment variables in the shell script, before I call the java program. Still the same error is obtained. |
Sure you've Set the variable value in the script. But did you EXPORT the variable in the script before calling the process that needs it?
Enjoy
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| mqmhr |
| Posted: Thu Jan 25, 2007 5:37 pm Post subject: |
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Joined: 28 Dec 2004
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We have resolved this issue now.
From the HP site for JRE 1.4.2.07,
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| Java requires dynamic loading (SHLIB_PATH, LD_LIBRARY_PATH) which are disabled in setuid or setgid executables. Therefore Java cannot run with setuid or setgid. |
runmqtmc being a setuid program, was unable to launch JRE 1.4.2.07
We upgraded JRE version to 1.4.2.10 and runmqtmc was able to launch the JVM without any issues.
It was a good lesson to learn and hope this thread benefits others with a similar problem. |
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| Nigelg |
| Posted: Mon Jan 29, 2007 1:53 am Post subject: |
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Joined: 02 Aug 2004
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| It was a good lesson to learn and hope this thread benefits others with a similar problem. |
I gave that answer on Jan 10th. Shame you did not read the replies to your question back then, then this thread might have helped you with your problem...
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