RFR: JNI: Return the correct error code when a VM is already created

[Sylvestre Ledru]

Hello,

I initially proposed this attached patch 3 years ago [1]
I was wondering if this patch could be applied against the version 8. I
tested it against the JDK 7 and 8 (the patch applies without any problem
to both forest).

This would save a lot of time for people who are getting this bug.
Without it, it is hard to find out what is wrong in the JNI code.

Thanks,
Sylvestre
[1]
http://mail.openjdk.java.net/pipermail/hotspot-dev/2010-September/003340.html
PS: please C/C me

-------------- next part --------------
A non-text attachment was scrubbed...
Name: JNI_EEXIST-usage.diff
Type: text/x-patch
Size: 888 bytes
Desc: not available
Url : http://mail.openjdk.java.net/pipermail/hotspot-runtime-dev/attachments/20130702/851a78bc/JNI_EEXIST-usage-0001.diff