Tim Ellison wrote:
Geir Magnusson Jr. wrote:
Oliver and Co :
I don't know if you caught this in another thread, but I recently
changed the launcher to pass the "-showversion" cmd line param through
to the VM after the launcher prints out its version, so that we can also
know the version of the VM.
The problem with this brilliant strategy is that J9 doesn't actually
deal with -showversion.
Can you add that to the list of things to tweak? Either silently
swallow it, or print something useful would be my suggestion...
geir
Hmm, I'm not convinced that you can expect each VM to respond to
-showversion, we may have to continue to handle that in the launcher.
I think the decision will be if we care about other unrelated VMs for
the launcher.
Certainly another VM in popular usage (Sun 5.0) doesn't recognise it
based on my test code below.
I'm not too worried about that. :)
We hacked the harmony launcher code to do the brain-dead thing of
printing out the launcher version, but I agree that it should print more
useful info like the VM + classlib versions.
Yep
A reasonable way to get the VM version info would be to create the VM
then print the 'java.vm.version' property value.
That's a good approach, I suppose. On the list... right now we can
survive as we took out the flag in the test suite, but would be nice to
get working again.
If you set the ignoreUnrecognized flag to JNI_TRUE then the VM is
created, but does not show the version info of course.
-------------------------------------------------
#include <stdio.h>
#include "jni.h"
int main (int argc, char* argv[]) {
JNIEnv *env;
JavaVM *vm;
JavaVMInitArgs vm_args;
JavaVMOption options[1];
int rc;
options[0].optionString = "-showversion";
vm_args.version = JNI_VERSION_1_2;
vm_args.options = options;
vm_args.nOptions = 1;
vm_args.ignoreUnrecognized = JNI_FALSE;
rc = JNI_CreateJavaVM(&vm, (void **)&env, &vm_args);
if (rc < 0) {
printf("Failed to create VM with rc=%d.", rc);
} else {
printf("Created VM successfully.");
(*vm)->DestroyJavaVM(vm);
}
return(0);
}
-------------------------------------------------
Regards,
Tim
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