Use of NewString and NewStringUTF to create a jstring

Hi, I try to use NewString() and NewStringUTF() to create a jstring to pass to SetObjectField().
I see that these 2 methods don't creany anything!
C++ code
jstring jstr1=env->NewStringUTF("my test");
if (!jstr1) printf("Warning ERROR\n");
printf("value of jstr1 is %s\n",,jstr1);
env->SetObjectField(ilContatore,fid1,jstr1);
when arrive at SetObjectField invocation, there is an error:
# HotSpot Virtual Machine Error, EXCEPTION_ACCESS_VIOLATION
# Please report this error at
# http://java.sun.com/cgi-bin/bugreport.cgi
# Error ID: 4F533F57494E13120E43505002D4
abnormal program termination
I see that the jstr1 have a NULL value, but I assign it!!!
Is there anyone knowing why it's goes on?
Thanks!!

If jstr1 is really NULL, then your program will crash when you attempt to printf its value just before the call to SetObjectField. In other words, printf is crashing, not SetObjectField.
You have to find out why the call to env->NewStringUTF is returning NULL. If it returns NULL, you can't use the return value in any other JNI calls.
Do other calls to env functions work properly? Perhaps your initialization is incorrect.

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