c++ - Java JNI UnsatisfiedLinkError C char pointer to pointer -

hi working on project c++ framework shall integrated java program, started exploring jni. struggling type conversions , argument types should declared in java native method since new c++.

in cpp-file have following method:

using namespace std;  int main(int argc,char**argv) {   //do stuff }  

my corresponding java class looks this:

public class jnitest {  static {     system.loadlibrary("plain2snt"); }  public jnitest() {      char[][] arguments = new char[][] {"resourcefile1.txt".tochararray(), "resourcefile2.txt".tochararray()};     main(2, arguments); }  public native int main(int argc, char[][] argv);  } 

and header file java class following:

#include <jni.h> /* header class testpackage_jnitest */  #ifndef _included_testpackage_jnitest #define _included_testpackage_jnitest #ifdef __cplusplus extern "c" { #endif /*  * class:     testpackage_jnitest  * method:    main  * signature: (i[[c)i  */ jniexport jint jnicall java_testpackage_jnitest_main   (jnienv *, jobject, jint, jobjectarray);  #ifdef __cplusplus } #endif #endif 

when try run following error:

exception in thread "main" java.lang.unsatisfiedlinkerror:  testpackage.jnitest.main(i[ljava/lang/string;)i     @ testpackage.jnitest.main(native method)     @ testpackage.jnitest.<init>(jnitest.java:14)     @ testpackage.main.main(main.java:6) 

i used google, jni api reference, etc. type matching between java , c++ not find how handle char pointer pointer type in java. actual type definition in java class argv argument match char** in cpp framework?

when jvm tries invoke native method - expects you've implemented function pointed @ header generated javah. i.e. library somewhere must contain

jniexport jint jnicall java_testpackage_jnitest_main   (jnienv *, jobject, jint, jobjectarray) {     /* stuff */ } 

and caught exception claim, there no implementation native method.

next, more convenient pass arguments not array-of-array-of-char array of string.

public jnitest() {      string[] arguments = new string[] {"resourcefile1.txt", "resourcefile2.txt"};     main(2, arguments); }  public native int main(int argc, string[] argv);  } 

in c++ can obtain args in next way:

jniexport jint jnicall java_testpackage_jnitest_main (jnienv *, jobject thiz, jint argc, jobjectarray argv) {     for(jsize = 0; < env->getarraylength(argv); i++) {         jstring str = (jstring)env->getobjectarrayelement(argv, i);         const char *c_str = env->getstringutfchars(str, null);         /* whatever want c_str */         env->releasestringutfchars(str, c_str);     }      /* ... */ }