CreateJavaVM fails with JNI_ENOMEM (-4) even though there is enogh memory

Hi,
I am creating a VM on Win XP using JNI_CreateJavaVM. It fails when I add an option "-Xmx1024M", error code being JNI_ENOMEM (-4). It works with "-Xmx500M". The system has 2GB memory, other java processes (non-JNI) start without problems even with more than "-Xmx1024M".
Any ideas?
Bye,
Michael

I have a similar, but I think much simpler problem. Namely, I get ENOMEM's when as far as I can tell there's plenty of memory available. It seems to have something to do with how Windows is configured, although I've never been able to determine what it could be.FWIW, in my case, I found that if I loaded my JNI dll into a console process, the max heap requested was always allocated. But when loading into Excel, the same amount would be too much. This was partly due to the fact that Excel has its own memory management, limiting the amount of memory workbooks can use. Also, it could be due to the vm not being able to reserve a contiguous chunk of memory for the max heap space.
Why (and how) separate the permanent generation space from the rest of the max heap? It seems you'll fail if you can't get that much space (which is the why) but how did you determine what it is?The VM uses the perm gen space plus the requested max heap space when attempting the VirtualAlloc call to verify that it can allocate the specified amount. The default perm gen is 64MB, but that can be changed via the -XX:MaxPermSize vm parameter, so I allow for any requested value.
What's CRUSH_JNI_VERSION? It's not in any .h file I have.That's just my own constant defined to be either JNI_VERSION_1_4 or JNI_VERSION_1_6.
Why are you messing with the bootclasspath? (I suspect you're adding something to it. Generally the VM can find it's own damn classpath).Yep, I'm adding the 2.1 JAXB jar to the bootclasspath because earlier 1.6 distributions included JAXB 2.0 and I needed 2.1.
-sarah

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