Java HotSpot Virtual Machine

Hi,

Before someone tells me to do a search first, believe me: I have! I just still dont have a definite answer :)

I have a program that might be suffering from a memory leak, the non-JNI part of the program is large but extremelly simple so i think im doing something wrong with regards to releasing JNI resources.

For example, consider this:
...
char* str = new char[100];
jstring jstr = env->NewStringUTF(str);
env->DeleteLocalRef(jstr);
...

Should i clean up str manually using delete[] str or will the JVM GC take care of this? Is DeleteLocalRef the correct way to clean up after NewStringUTF? Will the new jstring be a copy or a pointer to the native string?

A similar situation arises with GetStringUTFChars:

...
char* str = env->GetStringUTFChars(someJstring,NULL);
env->ReleaseStringUTFChars(someJstring,str);
...
Should i do something about str, or has it already been deleted/cleaned up? And does this behavior depend on the isCopy return value?

What about stuff returned from calling java method. Say i from java call a native method which in its operation calls a Java method which returns some object. I assume this will keep the returned object from being gc'ed until the reference i have is released, but is the returned value a localref which will disappear once my JNI method returns?

I would really appreciate some definite answers to this, ESPECIALLY the first question.

thanks for reading