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From: junyoung on 27 Apr 2010 01:02
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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