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How to throw Exceptions in JNI

Posted on 2004-08-16
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Last Modified: 2013-11-23
Hello all,

How to throw Exceptions in JNI??

class  TestException
{
      public native String getFileType(String magicFile,String strFile)throws Exception;
      public static void main(String[] args)
      {
            System.out.println("Hello World!");
      }
}


javah generated code

/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class TestException */

#ifndef _Included_TestException
#define _Included_TestException
#ifdef __cplusplus
extern "C" {
#endif
/*
 * Class:     TestException
 * Method:    getFileType
 * Signature: (Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;
 */
JNIEXPORT jstring JNICALL Java_TestException_getFileType
  (JNIEnv *, jobject, jstring, jstring);

#ifdef __cplusplus
}
#endif
#endif


JNIEXPORT jstring JNICALL Java_TestException_getFileType
  (JNIEnv *env, jobject object , jstring str1, jstring str2)
{
//some blah blah blah
 
 //now assume exception raised here. then how should c source should return exception object to JVM.
}

Thanks and Best Regards
Sudhakar
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Question by:sudhakar_koundinya
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9 Comments
 
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girionis earned 125 total points
ID: 11807568
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by:sudhakar_koundinya
ID: 11807587
thanks. take ur A
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by:expertmb
ID: 11807591
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Gigs: Get Your Project Delivered by an Expert

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by:expertmb
ID: 11807597
oooooooooopss!!!
forgot to reload the question
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Expert Comment

by:girionis
ID: 11807602
Thank you for accepting, glad I was of help :)
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Author Comment

by:sudhakar_koundinya
ID: 11807962
girionis

one quick question

after throwing error if i don't return anything JVM is raising exception. Is it must to return some thing
if(strlen(getError())>0)
      {
            jclass excCls = (*env)->FindClass(env,"java/lang/Exception");
            if (excCls != 0)
            {
                  (*env)->ThrowNew(env, excCls, getError());
                  return ""; //ok ->Is this must here??
                  //return ""; //not ok
            }
      }

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Expert Comment

by:girionis
ID: 11808008
Are you calling it from a C function that returns something? If yes then I'd expect that you need to return something anyway.
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Author Comment

by:sudhakar_koundinya
ID: 11808286
ok, I understand that

Thanks for nice links :-)
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Expert Comment

by:girionis
ID: 11808308
:)
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