I can't call more than 1 Java method from C

Question

Hi friends,
I my program written in C i call two Java methods, but the first method execute correct but the second display a error message:
Unexpected Signal : EXCEPTION_ACCESS_VIOLATION occurred at PC=0x6d475879
Function name=JVM_FindSignal
Library=d:\jdk1.3.1\jre\bin\hotspot\jvm.dll
I inverted the functions, but ever the second function makes a error.
This is my C program:
#include "jni.h"
#include <stdio.h>
#include <windows.h>
#include <stdlib.h>
#include <string.h>
char *getclasspath()
char ambiente[100000];
static char result[200000];
strcpy(ambiente,"-Djava.class.path=");
strcat(ambiente,getenv("CLASSPATH"));
int tam=strlen(ambiente),i,tamresult=0;
for(i=0;i<tam;i++)
if(ambiente!='\\')
result[tamresult++]=ambiente[i];
else
result[tamresult++]='\\';
result[tamresult++]='\\';
result[tamresult]=0;
return result;
char **__stdcall getServerList(int sessionId)
     JavaVM *vm;
     JNIEnv *env;
     JavaVMInitArgs vm_args;
     JavaVMOption options[1];
     options[0].optionString = getclasspath();
     vm_args.version = JNI_VERSION_1_2;
     vm_args.options = options;
     vm_args.nOptions = 1;
     vm_args.ignoreUnrecognized = 1;
     jclass cls;
     jmethodID mid;
     char *retorno;
     int i=0;
     int k=0;
     int j=0;
     char aux[100][100];
     char *lista_server[20];
     char **lista_server_ret;
     /* Invoca a m�quina virtual Java */
     jint res = JNI_CreateJavaVM(&vm, (void **)&env, &vm_args);
     if (res < 0)
          printf("Can't create Java VM\n");
          exit(1);
     /* Procura pela classe */
     cls = (jclass) env->NewGlobalRef(env->FindClass("br.com.cpqd.sagre.security.argus.SagreWebWrapper"));
     if (cls == 0)
          printf("Can't found br.com.cpqd.sagre.security.argus.SagreWebWrapper class\n");
          exit(1);
     /* Procurando o metodo Java getListServerStr */
     if ((mid = env->GetStaticMethodID (cls,"getServerListStr","(I)Ljava/lang/String;")) == 0)
          fprintf (stderr,"Metodo nao encontrado Str\n");
          exit(1);
     jint param = (jint) sessionId;
     /* Executa o m�todo */
     jstring str_java = (jstring) env->CallStaticObjectMethod(cls,mid,param);
     retorno = (char *) env->GetStringUTFChars(str_java,0);
     vm->DestroyJavaVM ();
     int len = strlen(retorno);
     for(i=0;i<len;i++)
     if(retorno[i]!=' ')
          aux[k][j]= retorno[i];
          j++;
     else
          aux[k][j]='\0';
          k++;
          j=0;
     for(i=0;i<k;i++)
          lista_server[i] = aux[i];
     lista_server_ret=(char**)lista_server;
     return lista_server_ret;
char __stdcall encrypt(char clearText)
static JavaVM *vm;
static JNIEnv *env;
JavaVMInitArgs vm_args;
JavaVMOption options[1];
options[0].optionString = getclasspath();
/*     "-Djava.class.path=.;.\\SagreUtil.jar";*/
vm_args.version = JNI_VERSION_1_2;
vm_args.options = options;
vm_args.nOptions = 1;
vm_args.ignoreUnrecognized = 1;
jclass cls;
jobject obj;
jmethodID mid;
char *retorno;
/* Invoca a m�quina virtual Java */
jint res = JNI_CreateJavaVM(&vm, (void **)&env, &vm_args);
if (res < 0)
printf("Can't create Java VM\n");
/* Procura pela classe */
cls = env->FindClass("br.com.cpqd.sagre.security.argus.SagreWebWrapper");
if (cls == 0)
printf("Can't find br.com.cpqd.sagre.security.argus.SagreWebWrapper class\n");
/* Procurando o metodo Java encrypt */
if ((mid = env->GetMethodID (cls,"encrypt","(Ljava/lang/String;)Ljava/lang/String;")) == 0)
fprintf (stderr,"Can't find the encrypt method\n");
exit(1);
jstring param = (jstring) env->NewStringUTF (clearText);
/* Instancia o metodo */
obj = env->NewObject(cls,mid,param);
/* Executa o m�todo encrypt */
jstring str_java = (jstring) env->CallObjectMethod(obj,mid,param);
if(str_java!=0)
retorno = (char *) env->GetStringUTFChars(str_java, 0);
else
     vm->DestroyJavaVM ();
     return NULL;
/* Destroi JVM */
vm->DestroyJavaVM ();
return retorno;
int main()
     char **teste;
     char *wilson;
     teste = getServerList(-1);
     printf("Fine %s",teste[1]);
     wilson = encrypt("blablabla");
     printf("%s",wilson);
I appreciate for any reply.
[ ]'s
Bruno

Answer 1

vikram ..
if u r using ms vc++ then there is an option in the directories tab to specify various include files.
if this doesn't work then u can use the command line compiler for vc++ , cl.exe. using cl u can give the -I option and specify the path of whatever file u want to add.
as for the specific file <jni.h> u can find it at :
driveletter:\jdk1.x\include
though i have never used this file as an include statement in .c files that i use for jni.
Dum Spiro Spero