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multiple JVM from a single process  RSS feed

 
priyat
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Hi,

Has anyone tried creating multiple JVMs in a single process? I am using jdk 1.4. and using C++ native methods to invoke the JVM.

To test, I tried 2 successive calls to

jint ret1 = JNI_CreateJavaVM(&_jvm1, (void **)&localJNIEnv1, &javaVMArgs);
jint ret2 = JNI_CreateJavaVM(&_jvm2, (void **)&localJNIEnv2, &javaVMArgs);

javaVMArgs is initialized correctly. ret1 = 0 indicating success. ret2 = -1 (JNI_ERR in jni.h, which is an unknown error). If there is a limitiation to create more than one JVM, then I'd have expected error returned to be -5 (JNI_EEXIST which means VM already created).

Java Invocation API doc http://java.sun.com/j2se/1.4.2/docs/guide/jni/spec/invocation.html mentions that "JDK 1.1.2 does not support creating more than one VM in a single process." in one place and "JDK 1.1 does not support creating more than one VM in a single process. " in another place. No mention of jdk 1.4 however.

If anyone has tried this successfully or has any ideas, I'd appreciate feedback. Thanks.
 
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