call jni function dynamically without getting a JNIEnv handle as an argument.

From:
junyoung <juneng603@gmail.com>
Newsgroups:
comp.lang.java.programmer
Date:
Mon, 26 Apr 2010 22:02:56 -0700 (PDT)
Message-ID:
<ce8ce94c-6af9-4de0-9ed0-9c2099a3778a@s22g2000prd.googlegroups.com>
My application is using the jni interface to link java with c.

but, there is problem to use it. that is,

in side of the jni, I set a callback function to catch errors and
print it. this callback function tasks error informations.
and additionally, I can't expect the time this callback function wil
be called.

this is the simple structure of my code.

java:

ret = SetErrorHandle();

private native SetErrorHandle();

c:
static int generateException(void *aArg)
{
  JNIEnv *sEnv = (JNIEnv *)aArg;
  jclass sClass = (*aEnv)->FindClass("MyException");

  sClass->ThrowNew(sEnv, "Error is here");
}

JNIEXPORT jint SetErrorHandle(JNIEnv *aEnv, jclass aClass)
{
   /* this function will be called if there is an error */
   /* first argument : function pointer
      second argument : argument for function pointer
   */
   setCallback(generateException, aEnv)
}

in this code, there are critical problems.
first one is sEnv variable pointer is not available in
generateException function.
whenever this function is called, it generated a segmentation fault
because the pointer is not AVAILABLE.

so my idea is to create new JNIEnv variable dynamically in
generateException function.

how do u think? if it is possible, how APIs I can reference?

thanks u.

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