It should be in any good JNI ressource.

Some code attached below.

Arne

================================================

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <jni.h>

void start_java(int maxmem, char *classpath, char *mainclass,int
nargs,char **args)
{
    JavaVMOption options[2];
    JavaVMInitArgs vm_args;
    JNIEnv *env;
    JavaVM *jvm;
    jint res;
    jclass mainclassptr;
    jmethodID mainmethod;
    jobjectArray mainargs;
    jstring *mainargsptr;
    int i;
    char maxmemopt[16];
    char classpathopt[1024];
    char mainclass2[128];
    sprintf(maxmemopt,"-Xmx%dm",maxmem);
    sprintf(classpathopt,"-Djava.class.path=%s",classpath);
    options[0].optionString = maxmemopt;
    options[1].optionString = classpathopt;
    vm_args.version = JNI_VERSION_1_4;
    vm_args.nOptions = 2;
    vm_args.options = options;
    vm_args.ignoreUnrecognized = JNI_FALSE;
    res = JNI_CreateJavaVM(&jvm,(void **)&env,&vm_args);
    if(res<0)
    {
        printf("Error creating JVM\n");
        return;
    }
    strcpy(mainclass2,mainclass);
    for(i=0;i<strlen(mainclass2);i++)
    {
        if(mainclass2[i]=='.')
        {
            mainclass2[i]='/';
        }
    }
    mainclassptr = (*env)->FindClass(env,mainclass2);
    if(mainclassptr==NULL)
    {
        printf("Error finding class %s\n",mainclass);
        return;
    }
    mainmethod = (*env)->GetStaticMethodID(env,mainclassptr,"main",
"([Ljava/lang/String;)V");
    if (mainmethod==NULL)
    {
        printf("Error getting main method in class %s\n",mainclass);
        return;
    }
    mainargs =
(*env)->NewObjectArray(env,nargs,(*env)->FindClass(env,"java/lang/String"),NULL);
    mainargsptr = (jstring *)malloc(nargs*sizeof(jstring));
    for(i=0;i<nargs;i++)
    {
        mainargsptr[i] = (*env)->NewStringUTF(env,args[i]);
        (*env)->SetObjectArrayElement(env,mainargs,i,mainargsptr[i]);
    }
    (*env)->CallStaticVoidMethod(env,mainclassptr,mainmethod,mainargs);
    free(mainargsptr);
    (*jvm)->DestroyJavaVM(jvm);
    return;
}

int main(int argc,char *argv[])
{
    /*
     * java -Xmx128m -classpath test.jar test.Test A BB CCC
     */
    char *args[] = { "A", "BB", "CCC" };
    start_java(128, "test.jar", "test.Test", 3, args);
    return 0;
}

see http://mindprod.com/jgloss/nativecode.html

here is a little wrapper I use for JAWS:

/**
* setup.cpp :
* invokes corresponding replicatorreceivercd?.jnlp file when invoked
from a CD
* setup.exe usually trigged by autorun.inf
* Need a different version depending on which drive letter is the CD
ROM drive.
* For windows only.
*
* copyright (c) 2003-2007 Roedy Green, Canadian Mind Products
* #101 - 2536 Wark Street
* Victoria, BC Canada V8T 4G8
* tel:(250) 361-9093
* http://mindprod.com
*/

#include "stdafx.h"  /* standard precompiled header */

#include <direct.h>  /* chdir, mkdir */
#include <process.h> /* exec, spawn */
#include <stdio.h>   /* fclose, fgetc, printf, remove, rename, setvbuf
*/
#include <stdlib.h>  /* exit, putenv, _splitpath */
#include <string.h>  /* strcpy, strcat, strcmp, strupr */

/* Configure root name of all the jnlp files we might invoke */
const char* jnlpBaseName = "replicatorreceivercd";

/**
* Invoke JNLP file corresponding to drive letter
* running from.
*
* @param argc   not used
* @param argv   not used
*
* @return system error code
*/
int main( int argc, char* argv[] )
  {
  // get current drive letter, the CD-ROM drive letter.
  char curDrive = 'A' +  _getdrive() - 1;

  // generate name of jnlp file corresponding to CD drive letter
  // e.g. replicatorreceiverR.jnlp
  int baseLength = strlen( jnlpBaseName );
  char* jnlpName = new char[ baseLength + 7];
  strcpy( jnlpName, jnlpBaseName );
  // tack on drive letter A..Z
  jnlpName[ baseLength ] = curDrive;
  jnlpName[ baseLength + 1 ] = 0;
  strcat ( jnlpName, ".jnlp" );

  // Java webstart is usually in
  // C:\Program Files\Java\j2re1.4.2_06\javaws\javaws.exe
  // but we can't count on it.
  // Find command processor shell that knows jnlp-to-javaws.exe
association.
  // Shell usually c:\winnt\system32\cmd.exe though
  // might be 4NT.exe or COMMAND.COM
  char* shell = getenv( "ComSpec" );
  if ( shell == NULL )
     {
     shell = "cmd.exe";
     }

  printf( "Installing %s with Java Web Start via the %s shell.\n",
jnlpName, shell );

  // This won't work if the *.jnlp -> javaws.exe association is
broken.

  // start up Java Web Start with, for example,
replicatorreceiverR.jnlp.
  if ( _spawnlp( _P_OVERLAY, shell, shell, "/C", jnlpName, NULL ) )
     {
     // ENOENT = 2 = not found
     // EINVAL = 22 = invalid arg
     printf ( "Java Web Start, part of the Java JRE, must be
installed first.  Error %u\n", errno );
     }
  delete jnlpName;
  return 0;
  }

--
Roedy Green Canadian Mind Products
The Java Glossary
http://mindprod.com