Re: Jawin failing after large number of object creations/uses

What JVM are you using?

Josh

>
>Hi
>
>I've been testing Jawin with the view to using it in some applications
>that run in app-servers.
>The key point for me is that the applications will run for a very long
>time, without being restarted.
>
>I've run a few tests with various common COM components where objects
>are repeatedly created, used and released.
>All of the tests I've run eventually fail after a large number of
>executions (depending on the particular COM object this can be 200,000
>-> 50,000,000).
>
>In all cases when the programme fails, the JVM locks.
>Dumping the threads for the process reveals that the JVM is stuck in a
>native method trying to print an exception stack trace, although any
>attempts to print anything at this point fail (even String constants).
>Running in a debugger reveals that a ComError is the error being thrown
>- after which the running Thread gets deadlocked in
>ClassLoader.findBootstrapClass( "java.util.Arrays" ) <native>.
>My guess is that this is some kind of native resource exhaustion for the
>process, which is why the JVM native methods are blocking.
>The memory and virtual memory for the JVM process is pretty much static
>throughout the run, and the Threads, Handles, GDI Object and User Object
>counts are also static.
>The Access Violation address (0x6D64A9DE) is inside the jvm.dll range
>(0x6D640000)  (i.e. not in jawin.dll).
>
>Has anyone seen this behaviour before, or have any ideas as to the cause?
>
>Some other (fairly unsubstantiated) observations:
>- failure seems to happen earlier when an STA thread is used (object is
>Both threaded).
>- failure seems to happen later when the thread is
>CoInitialize/CoUnitialized for each object creation, and later still if
>a single object is allocated and used repeatedly.
>
>tim
>
>
>ComError:
>-----------
>detailMessage= "Access Violation at 0x6D64A9DE, thread attempts to write
>at 0x830bec (description: The thread attempted to read from or write to
>a virtual address for which it does not have the appropriate access)"
>hresult= -2147418113
>
>Test method:
>--------------
>    public static void main(String[] args) throws Exception {
>        Ole32.CoInitialize(COINIT.MULTITHREADED);
>        try {
>
>            int i = 0;
>            while (true) {
>                DispatchPtr xr = new DispatchPtr("Msxml2.DOMDocument.5.0");
>
>                Boolean load = (Boolean)xr.invoke( "loadXML",
>"<foo>stuff</foo>" );
>
>//                System.out.println( load );
>//                System.out.println( xr.get( "xml" ) );
>
>                if (i % 100000 == 0) {
>                    System.out.println(i);
>                }
>                i++;
>                xr.close();
>            }
>        } catch (Error e) {
>            e.printStackTrace();
>        }
>        Ole32.CoUninitialize();
>    }