Multiple instances of the same application under OC4J

Hello,
I've currently deployed three copies (differently named deployments, differently named EARs) of the exact same application (using the BC4J framework) on OC4J. One version is the stand-alone distribution of OC4J 9.0.2.* running under UNIX. I have an identical deployment running under the JDeveloper 9iRC-bundled OC4J 9.0.2.* under Windows NT.
So far, I've had no problems running the three instances on the Windows NT servers concurrently. The UNIX server, however, allows access to whatever instance is accessed first, and fails on access to all other instances with a "cannot create application module" exception (a java.lang.ClassCastException is listed as cause, if that tells anyone anything).
This behavior is consistent, even when the java virtual machine is passed the jbo.server.in_oc4j=true flag on the command-line. Does anyone have an idea as to why? Has anyone been successful in deploying multiple applications on stand alone OC4J 9.0.2.* under unix?
Thanks in advance,
Gard Westrum

Your best bet to prevent this is to detach or unmount this drive; however, you can also try resetting your Mac's launch services, to have it re-scan only the Applications folders on your boot drive for programs to associate with documents and services you are using. Running the following command in the OS X Terminal will kill the current launch services database (its long, but copy and paste the entire line):
/System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -kill
Following this, run the following command to seed the database with the apps you currently have installed:
/System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -seed
Note that these changes will only apply when opening documents that have not been specifically assigned to a program. If you find a specific document continues to open the program on the external drive, then you can get info on it and change the associated program in the "Open With" section of the info window. After doing this, you might need to re-run these commands above, as opening the program will register it with OS X's launch services and have it now be available for automatically handling other documents.

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    Why? But okay.Because the the different applets show information about different items.
    Now, with multiple applets running at the same time the parsing no loger works. If one applet is doing some parsing and a
    taskswitch takes place to let another applet run, the applet which is interrupted is not able to continue the
    parsing as it looses its "incoming data" when another applet reads from the server.
    How did you determine that's what's happening?By printing out debuginformation.
    Each applet prints out a message (System.out.println) when it creates an instance of Document (ie. connects to the server) and the applet also prints out XML-information as the XML-file is processed.
    But, actually, I was a bit quick in my first post; The applet doesen't neccesarily loose its "incoming data", but the parser looses the data it is parsing. I can download the data from the server first, and then start parsing it. If a taskswitch happens while one applet is parsing, it looses its data, even if the data is allready downloaded.
    I see this since I see another applet making a printout, and when first applet starts again, the parser has lost track of its data.
    It works fine if only one applet is running. And everything is fine until the next applets starts; I can see this from the printout.
    Again, the appet prints out data as it parses the document. I see the next applet starting to work, and when the first one continues parsing again the printout shows that data is no longer there. It happens everytime the runtime switches to another applet, and it never happens if just one applet is running.
    Googeling a little tells me that DocumentBuilder.parse() isn't thread-safe, but this shouldn't have anything to do with it, should it?
    Each applet is a separate process, and not different threads in the same process, aren't they? (Not sure how the runtime treats multiple applets...)And secondly, the applets create their own instance of Document anyways.

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