Multiple JNI calls

I have created a class which calls my native c code. Just to test if everything was working fine I tested my class with one input file and one output file.
import java.io.*;
class JNIFoil {
     public native static void runFoilUsingJNI(String foilInput, String foilOutput);
     public static void main(String[] args) {
          JNIFoil.runFoilUsingJNI("./foil-log/add-R002S003-P01N00.d", "./foil-log/add-R002S003-P01N00-log.txt");
          System.out.println("Inside main");
          JNIFoil.runFoilUsingJNI("./foil-log/add-R004S006-P01N00.d", "./foil-log/add-R004S006-P01N00-log.txt");
     static {
          System.loadLibrary("foil");
}The native function implementation is as follows:
#include "JNIFoil.h"
#include <stdio.h>
const char* inFile;
const char* outFile;
void enter();
JNIEXPORT void JNICALL Java_JNIFoil_runFoilUsingJNI(JNIEnv * env, jclass cl, jstring inputFile, jstring outputFile) {
     jboolean incopy, outcopy;
     //printf("\nInside JNIFoil.c with input to foil");
     inFile = (*env)->GetStringUTFChars(env,inputFile,&incopy);
     outFile = (*env)->GetStringUTFChars(env, outputFile, &outcopy);
     printf("\n File for foil is %s %s", inFile, outFile);
     enter();
     printf("\nReturning now");
void enter() {
     printf("\nCalling main");
     int a = main(1, "", inFile, outFile);
     printf("\nAfter Calling main with %d", a);
}But when I added in the second call to my native function weird thing is happening. First of all I dont see "Inside main" getting printed on console and also the second call to my native function is not working properly. I have no clue what is causing this and how do I fix this? Any suggestions or help would be appreciated.

Actually I realized after seeing this output file that my JVM is crashing.
# A fatal error has been detected by the Java Runtime Environment:
# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x1000f52d, pid=1184, tid=3716
# JRE version: 6.0_20-b02
# Java VM: Java HotSpot(TM) Client VM (16.3-b01 mixed mode, sharing windows-x86 )
# Problematic frame:
# C [foil.dll+0xf52d]
# If you would like to submit a bug report, please visit:
#   http://java.sun.com/webapps/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
--------------- T H R E A D ---------------
Current thread (0x00bf9800): JavaThread "main" [_thread_in_native, id=3716, stack(0x001c0000,0x00210000)]
siginfo: ExceptionCode=0xc0000005, reading address 0x0000002e
Registers:
EAX=0x0000002e, EBX=0x03ed0478, ECX=0x00000001, EDX=0x00000000
ESP=0x0020fa00, EBP=0x0020fa28, ESI=0x00000014, EDI=0x00bf9800
EIP=0x1000f52d, EFLAGS=0x00010206
Top of Stack: (sp=0x0020fa00)
0x0020fa00:   00000014 00bf9800 0020fa28 1000f901
0x0020fa10:   03ed0528 03ed04d8 00000006 03ed0940
0x0020fa20:   03ed0478 00000006 0020fa58 1000fad6
0x0020fa30:   03ed0920 0000002e 00000000 00000000
0x0020fa40:   0000002e 00000000 00000006 0000002e
0x0020fa50:   0021be64 03ed0940 0020fa88 1000f085
0x0020fa60:   00000000 00000000 03ed0920 1000bb39
0x0020fa70:   00000006 03ed0920 00000013 00000002
Instructions: (pc=0x1000f52d)
0x1000f51d:   28 8b 45 10 8b 55 14 88 45 ff 88 55 fe 8b 45 0c
0x1000f52d:   83 38 00 0f 84 a6 00 00 00 8b 4d 0c 0f b6 45 ff
Stack: [0x001c0000,0x00210000], sp=0x0020fa00, free space=13e0020f51ck
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
C [foil.dll+0xf52d]
C [foil.dll+0xfad6]
C [foil.dll+0xf085]
C [foil.dll+0x1d1a]
C [foil.dll+0x1345]
C [foil.dll+0x129a]
j JNIFoil.runFoilUsingJNI(Ljava/lang/String;Ljava/lang/String;)V+0
j JNIFoil.main([Ljava/lang/String;)V+29
v ~StubRoutines::call_stub
V [jvm.dll+0xf049c]
V [jvm.dll+0x17fcf1]
V [jvm.dll+0xf051d]
V [jvm.dll+0xf9bc5]
V [jvm.dll+0x10181d]
C [java.exe+0x2155]
C [java.exe+0x85b4]
C [kernel32.dll+0x51194]
C [ntdll.dll+0x5b495]
C [ntdll.dll+0x5b468]
Java frames: (J=compiled Java code, j=interpreted, Vv=VM code)
j JNIFoil.runFoilUsingJNI(Ljava/lang/String;Ljava/lang/String;)V+0
j JNIFoil.main([Ljava/lang/String;)V+29
v ~StubRoutines::call_stub
--------------- P R O C E S S ---------------
Java Threads: ( => current thread )
0x01a55000 JavaThread "Low Memory Detector" daemon [_thread_blocked, id=112, stack(0x03e00000,0x03e50000)]
0x01a4d800 JavaThread "CompilerThread0" daemon [_thread_blocked, id=2996, stack(0x03db0000,0x03e00000)]
0x01a4c800 JavaThread "Attach Listener" daemon [_thread_blocked, id=900, stack(0x03d60000,0x03db0000)]
0x01a49800 JavaThread "Signal Dispatcher" daemon [_thread_blocked, id=4016, stack(0x03d10000,0x03d60000)]
0x01a45800 JavaThread "Finalizer" daemon [_thread_blocked, id=4040, stack(0x03cc0000,0x03d10000)]
0x01a40c00 JavaThread "Reference Handler" daemon [_thread_blocked, id=2584, stack(0x03c70000,0x03cc0000)]
=>0x00bf9800 JavaThread "main" [_thread_in_native, id=3716, stack(0x001c0000,0x00210000)]
Other Threads:
0x01a3f800 VMThread [stack: 0x03c20000,0x03c70000] [id=2568]
0x01a56c00 WatcherThread [stack: 0x03e50000,0x03ea0000] [id=2796]
VM state:not at safepoint (normal execution)
VM Mutex/Monitor currently owned by a thread: None
Heap
def new generation   total 4928K, used 281K [0x23af0000, 0x24040000, 0x29040000)
eden space 4416K,   6% used [0x23af0000, 0x23b365a8, 0x23f40000)
from space 512K,   0% used [0x23f40000, 0x23f40000, 0x23fc0000)
to   space 512K,   0% used [0x23fc0000, 0x23fc0000, 0x24040000)
tenured generation   total 10944K, used 0K [0x29040000, 0x29af0000, 0x33af0000)
   the space 10944K,   0% used [0x29040000, 0x29040000, 0x29040200, 0x29af0000)
compacting perm gen total 12288K, used 27K [0x33af0000, 0x346f0000, 0x37af0000)
   the space 12288K,   0% used [0x33af0000, 0x33af6d80, 0x33af6e00, 0x346f0000)
    ro space 10240K, 51% used [0x37af0000, 0x3801ae00, 0x3801ae00, 0x384f0000)
    rw space 12288K, 54% used [0x384f0000, 0x38b872d8, 0x38b87400, 0x390f0000)
Dynamic libraries:
0x00400000 - 0x00424000      C:\Windows\system32\java.exe
0x770d0000 - 0x7720c000      C:\Windows\SYSTEM32\ntdll.dll
0x76fa0000 - 0x77074000      C:\Windows\system32\kernel32.dll
0x754d0000 - 0x7551a000      C:\Windows\system32\KERNELBASE.dll
0x76a40000 - 0x76ae0000      C:\Windows\system32\ADVAPI32.dll
0x76b30000 - 0x76bdc000      C:\Windows\system32\msvcrt.dll
0x77210000 - 0x77229000      C:\Windows\SYSTEM32\sechost.dll
0x76d20000 - 0x76dc1000      C:\Windows\system32\RPCRT4.dll
0x7c340000 - 0x7c396000      C:\Program Files\Java\jre6\bin\msvcr71.dll
0x6d800000 - 0x6da97000      C:\Program Files\Java\jre6\bin\client\jvm.dll
0x76480000 - 0x76549000      C:\Windows\system32\USER32.dll
0x77080000 - 0x770ce000      C:\Windows\system32\GDI32.dll
0x77250000 - 0x7725a000      C:\Windows\system32\LPK.dll
0x77260000 - 0x772fd000      C:\Windows\system32\USP10.dll
0x738f0000 - 0x73922000      C:\Windows\system32\WINMM.dll
0x76550000 - 0x7656f000      C:\Windows\system32\IMM32.DLL
0x76ed0000 - 0x76f9c000      C:\Windows\system32\MSCTF.dll
0x75150000 - 0x7519b000      C:\Windows\system32\apphelp.dll
0x6d7b0000 - 0x6d7bc000      C:\Program Files\Java\jre6\bin\verify.dll
0x6d330000 - 0x6d34f000      C:\Program Files\Java\jre6\bin\java.dll
0x6d290000 - 0x6d298000      C:\Program Files\Java\jre6\bin\hpi.dll
0x77230000 - 0x77235000      C:\Windows\system32\PSAPI.DLL
0x6d7f0000 - 0x6d7ff000      C:\Program Files\Java\jre6\bin\zip.dll
0x10000000 - 0x1001b000      C:\Documents and Settings\roaan\Desktop\SimStudent FOIL\SimStudent\FOIL6(ORIGINAL)\FOIL6\foil.dll
VM Arguments:
java_command: JNIFoil
Launcher Type: SUN_STANDARD
Environment Variables:
CLASSPATH=.;C:\Program Files\Java\jre6\lib\ext\QTJava.zip
PATH=C:\cygwin\usr\local\bin;C:\cygwin\bin;C:\cygwin\bin;ommonProgramFiles\Microsoft Shared\Windows Live;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\QuickTime\QTSystem\;C:\Program Files\Microsoft SQL Server\100\Tools\Binn\;C:\Program Files\Microsoft SQL Server\100\DTS\Binn\;C:\Program Files\Java\jdk1.6.0_20\bin;C:\Program Files\Common Files\Microsoft Shared\Windows Live;C:\Program Files\Java\jdk1.6.0_20\bin\
USERNAME=roaan
OS=Windows_NT
PROCESSOR_IDENTIFIER=x86 Family 6 Model 23 Stepping 10, GenuineIntel
--------------- S Y S T E M ---------------
OS: Windows 7 Build 7600
CPU:total 2 (2 cores per cpu, 1 threads per core) family 6 model 23 stepping 10, cmov, cx8, fxsr, mmx, sse, sse2, sse3, ssse3, sse4.1
Memory: 4k page, physical 3107188k(1736804k free), swap 6212612k(4745612k free)
vm_info: Java HotSpot(TM) Client VM (16.3-b01) for windows-x86 JRE (1.6.0_20-b02), built on Apr 12 2010 13:52:23 by "java_re" with MS VC++ 7.1 (VS2003)
time: Sat Aug 21 01:31:48 2010
elapsed time: 0 secondsI have been searching on different replies about what to do..., Any suggestions ?????

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Hi,
I am using the JNI call CallLongMethod to return a jlongArray.
jlongArray itemArray = (jlongArray)env->CallLongMethod(jObjFilterCondition, JavaIDs::_mids[JMETHOD_FI_GETALLVALUES]);
Here method id is cached and it was retrieved as follows:
env->GetMethodID (env->FindClass("com/fujitsu/pureweb/valueobjects/FilterItem"), "getAllValues", "()[J");
After this if I try to call GetLongArrayElements(), it results in gpf. This occurs only in Solaris (compiler used is cc 5.0 and JDK 1.3.1_02. The problem does not occur in Windows.
What can be possible reason for this?
*** Interestingly, if I replace CallLongMethod with CallIntMethod, it works!!!!!!
Regards,
Harish

If you are trying to get a reference to an array, then you are using the wrong JNI subroutine. An array is an object, and you have to use CallObjectMethod...

Multiple JNI calls

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