Different behaviour between 1.4,1.5_05, 1.5_07.

Hi and thanks in advance for your help,
Looking for pointers to a solution for a problem I have.
A set of Java classes subscribe to a subscription service and listen for updates on a network. To do this the JVM uses JNI (actually a JIntegra vendor product) to talk to the Windows DLL files on the server, it�s these files that actually listen for the updates. The information is then passed back up to the JVM (via the JIntegra libraries). The strange behaviour i get is as follows:
1.     No problems with JDK 1.4.*
2.     JDK1.5_05: The program runs fine for a few minutes and then crashes out BUT with no stack trace or errors at all (it just terminates).
3.     JDK 1.5_07: The program runs ok to start with but then consumes all the file handles on the Windows server. After approx 4hrs the program hangs as it has consumed all the servers spare file handles (in fact 3,800,000 of them).
The added problem of debugging this, is that we use a vendor for the Java/COM+ interaction and we don�t have the source code, But I have tried different versions of the JIntergra without any change in the behaviour (so i don't think its that). It appears to be the JVM version that causes the change in behaviour.
I do not understand why I get such different behaviour from the different versions of Java? Although both JDK1.5 don't work.
I was wondering if someone can point me in the right direction for trying to get JVM information outputted when the JDK1.5_05 crashes out.
How can I put a hook in the JVM in my code to output information when it exits. I realise its doing it unexpectedly so this type of solution might not work but I find it strange that no error is thrown.
Also; Does anyone know of any bugs that might possibly explain any this behaviour?
Any ideas anyone.

Jintegra recommend using 1.5. I will check the JNI bugs database to see if anything like this has happened before:
Got this one stacktrace recently:
# An unexpected error has been detected by HotSpot Virtual Machine:
# Internal Error (4D555445583F57494E13120E4350500080), pid=1944, tid=1500
# Java VM: Java HotSpot(TM) Client VM (1.5.0_07-b03 mixed mode, sharing)
# Can not save log file, dump to screen..
# An unexpected error has been detected by HotSpot Virtual Machine:
# Internal Error (4D555445583F57494E13120E4350500080), pid=1944, tid=1500
# Java VM: Java HotSpot(TM) Client VM (1.5.0_07-b03 mixed mode, sharing)
--------------- T H R E A D ---------------
Current thread is native thread
Stack: [0x045e0000,0x04620000), sp=0x0461fb08, free space=254k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [jvm.dll+0x11f2eb]
V [jvm.dll+0x62f13]
V [jvm.dll+0xd1741]
V [jvm.dll+0xd18f0]
V [jvm.dll+0x90d16]
--------------- P R O C E S S ---------------
Java Threads: ( => current thread )
0x03029730 JavaThread "J-Integra COM initialization thread (please don't touch)" daemon [_thread_blocked, id=1684]
0x00237c28 JavaThread "DestroyJavaVM" [_thread_blocked, id=3112]
0x009fc7c8 JavaThread "Thread-0" [_thread_blocked, id=2996]
0x009a16a8 JavaThread "Low Memory Detector" daemon [_thread_blocked, id=2860]
0x00238478 JavaThread "CompilerThread0" daemon [_thread_blocked, id=1464]
0x0099f730 JavaThread "Signal Dispatcher" daemon [_thread_blocked, id=3168]
0x009998e0 JavaThread "Finalizer" daemon [_thread_blocked, id=2928]
0x0023fae0 JavaThread "Reference Handler" daemon [_thread_blocked, id=2268]
Other Threads:
0x009982d8 VMThread [id=2036]
0x009a2ce8 WatcherThread [id=532]
VM state:not at safepoint (normal execution)
VM Mutex/Monitor currently owned by a thread: None
Heap
def new generation total 576K, used 244K [0x22ab0000, 0x22b50000, 0x22f90000)
eden space 512K, 47% used [0x22ab0000, 0x22aec330, 0x22b30000)
from space 64K, 6% used [0x22b40000, 0x22b410a8, 0x22b50000)
to space 64K, 0% used [0x22b30000, 0x22b30000, 0x22b40000)
tenured generation total 1408K, used 917K [0x22f90000, 0x230f0000, 0x26ab0000)
the space 1408K, 65% used [0x22f90000, 0x23075430, 0x23075600, 0x230f0000)
compacting perm gen total 8192K, used 1354K [0x26ab0000, 0x272b0000, 0x2aab0000)
the space 8192K, 16% used [0x26ab0000, 0x26c02a20, 0x26c02c00, 0x272b0000)
ro space 8192K, 67% used [0x2aab0000, 0x2b00d9f8, 0x2b00da00, 0x2b2b0000)
rw space 12288K, 46% used [0x2b2b0000, 0x2b853808, 0x2b853a00, 0x2beb0000)
Not sure what 'Internal Error (4D555445583F57494E13120E4350500080)' represents.
Thanks for your advice.

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