Javah error while using it in JNI

Question

Command:

javah -jni JavaHowTo

Result:

error: cannot access JavaHowTo 
class file for JavaHowTo not found

javadoc: error -          


        

Answer 1

I am using Eclipse.

Command syntax:

javah -d  -classpath  

outputdir - The directory where the header file is generated.

classpath - Contains an absolute path to the directory containing the root package.

fully_qualified_class - The name of the class containing native methods WITHOUT .class extension

The following file is generated:

C:\Users\John\workspace\JNITest\bin\com\canessa\john\jnitest\com_canessa_john_jnitest_CallMyCLib.h

The contents of the generated header file:

/* DO NOT EDIT THIS FILE - it is machine generated */
#include 
/* Header for class com_canessa_john_jnitest_CallMyCLib */

#ifndef _Included_com_canessa_john_jnitest_CallMyCLib
#define _Included_com_canessa_john_jnitest_CallMyCLib
#ifdef __cplusplus
extern "C" {
#endif
/*
 * Class:     com_canessa_john_jnitest_CallMyCLib
 * Method:    helloInC
 * Signature: ()V
 */
JNIEXPORT void JNICALL Java_com_canessa_john_jnitest_CallMyCLib_helloInC
  (JNIEnv *, jobject);

#ifdef __cplusplus
}
#endif
#endif