jni4net return value from c# to java
I'm using jni4net to call a library i made in C# (using visual studio 2013) from Java (Eclipse). Here is the code of my C# library :
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace ClassLibrary2
{
public class Class1
{
// Simple method that just prints a hard-coded string.
public void Hello()
{
Console.WriteLine("Hello Java, from .NET!");
}
// Parameterized method that accepts a string
public void Repeat(string line)
{
Console.WriteLine(line);
}
public int mult(int n)
{
return n*2;
}
}
}
and here is my java code :
import net.sf.jni4net.Bridge;
import net.sf.jni4net.Ref;
public class jni {
public static void main(String[] args) {
try {
//Bridge.setVerbose(true);
Bridge.init();
Bridge.LoadAndRegisterAssemblyFrom(new File("ClassLibrary2.j4n.dll"));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Class1 c = new Class1();
c.Hello();
c.Repeat("pippo");
c.mult(2);
}
}
I'm using "proxygen" script that was included into jni4net packet to wrap mt C# code into Java.
when i call the functions "Hello" and "Repeat" everything works just fine. I get the correct output, but when calling the function "mult" I get the following error :
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (0xe0434352), pid=6808, tid=7100
#
# JRE version: Java(TM) SE Runtime Environment (8.0_11-b12) (build 1.8.0_11- b12)
# Java VM: Java HotSpot(TM) Client VM (25.11-b03 mixed mode, sharing windows-x86 )
# Problematic frame:
# C [KERNELBASE.dll+0xc42d]
#
# Failed to write core dump. Minidumps are not enabled by default on client versions of Windows
#
# An error report file with more information is saved as:
# C:\ws\DLL\jni4net\hs_err_pid6808.log
#
# If you would like to submit a bug report, please visit:
# http://bugreport.sun.com/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#
It also generates a log file, here it is :
--------------- T H R E A D ---------------
Current thread (0x00dcc000): JavaThread "main" [_thread_in_native, id=7100, stack(0x00e60000,0x00eb0000)]
siginfo: ExceptionCode=0xe0434352, ExceptionInformation=0x80131513 0x00000000 0x00000000 0x00000000 0x72450000
Registers:
EAX=0x00eae5ec, EBX=0x00000005, ECX=0x00000005, EDX=0x00000000
ESP=0x00eae5ec, EBP=0x00eae63c, ESI=0x00eae6ac, EDI=0x00000001
EIP=0x7566c42d, EFLAGS=0x00000202
Top of Stack: (sp=0x00eae5ec)
0x00eae5ec: e0434352 00000001 00000000 7566c42d
0x00eae5fc: 00000005 80131513 00000000 00000000
0x00eae60c: 00000000 72450000 00000001 00000000
0x00eae61c: 006d235c 001f0178 00000000 001f0150
0x00eae62c: 72461865 006d235c 00239dc0 00eae5f4
0x00eae63c: 00eae6e0 725a2a42 e0434352 00000001
0x00eae64c: 00000005 00eae6ac d1e7f1fc 1665aae0
0x00eae65c: 002a7da8 00eae798 00239dc0 00000001
Instructions: (pc=0x7566c42d)
0x7566c40d: 02 50 ff 75 14 8d 45 c4 50 e8 57 ad 02 00 83 c4
0x7566c41d: 0c eb 03 89 45 c0 8d 45 b0 50 ff 15 5c 11 66 75
0x7566c42d: c9 c2 10 00 cc cc cc cc cc 8b ff 55 8b ec 56 8b
0x7566c43d: 75 08 83 fe f4 72 18 83 fe f6 77 13 8d 45 08 50
Register to memory mapping:
EAX=0x00eae5ec is pointing into the stack for thread: 0x00dcc000
EBX=0x00000005 is an unknown value
ECX=0x00000005 is an unknown value
EDX=0x00000000 is an unknown value
ESP=0x00eae5ec is pointing into the stack for thread: 0x00dcc000
EBP=0x00eae63c is pointing into the stack for thread: 0x00dcc000
ESI=0x00eae6ac is pointing into the stack for thread: 0x00dcc000
EDI=0x00000001 is an unknown value
Stack: [0x00e60000,0x00eb0000], sp=0x00eae5ec, free space=313k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
C [KERNELBASE.dll+0xc42d]
C [clr.dll+0x152a42]
C [clr.dll+0x2255ef]
C [clr.dll+0x22de52]
C [clrjit.dll+0x28df]
C [clrjit.dll+0x290b]
C [clrjit.dll+0x1d53]
C [clrjit.dll+0x1f48]
C [clrjit.dll+0x3405]
C [clrjit.dll+0x3635]
C [clrjit.dll+0x3823]
C [clrjit.dll+0x36f6]
C [clrjit.dll+0x385f]
C [clr.dll+0x34710]
C [clr.dll+0x347a9]
C [clr.dll+0x347eb]
C [clr.dll+0x33684]
C [clr.dll+0x33920]
C [clr.dll+0x41e5e]
C [clr.dll+0x150b6]
C [clr.dll+0x4279]
C 0x151d4d03
j classlibrary2.Class1.mult(I)I+0
j jni4net.jni.main([Ljava/lang/String;)V+43
v ~StubRoutines::call_stub
V [jvm.dll+0x142295]
V [jvm.dll+0x2073ae]
V [jvm.dll+0x14232e]
V [jvm.dll+0xce7c7]
V [jvm.dll+0xd6d6f]
C [javaw.exe+0x20d8]
C [javaw.exe+0xab91]
C [javaw.exe+0xac1b]
C [kernel32.dll+0x1338a]
C [ntdll.dll+0x39f72]
C [ntdll.dll+0x39f45]
Java frames: (J=compiled Java code, j=interpreted, Vv=VM code)
j classlibrary2.Class1.mult(I)I+0
j jni4net.jni.main([Ljava/lang/String;)V+43
v ~StubRoutines::call_stub
--------------- P R O C E S S ---------------
Java Threads: ( => current thread )
0x15c0ac00 JavaThread "Thread-0" daemon [_thread_in_native, id=5404, stack(0x15ef0000,0x15f40000)]
0x007b9000 JavaThread "Service Thread" daemon [_thread_blocked, id=5452, stack(0x15ad0000,0x15b20000)]
0x00788400 JavaThread "C1 CompilerThread0" daemon [_thread_blocked, id=7312, stack(0x04700000,0x04750000)]
0x00787400 JavaThread "Attach Listener" daemon [_thread_blocked, id=6992, stack(0x01240000,0x01290000)]
0x00779400 JavaThread "Signal Dispatcher" daemon [_thread_blocked, id=568, stack(0x15940000,0x15990000)]
0x00776c00 JavaThread "Finalizer" daemon [_thread_blocked, id=4412, stack(0x15390000,0x153e0000)]
0x00771c00 JavaThread "Reference Handler" daemon [_thread_blocked, id=5608, stack(0x151f0000,0x15240000)]
=>0x00dcc000 JavaThread "main" [_thread_in_native, id=7100, stack(0x00e60000,0x00eb0000)]
Other Threads:
0x0076fc00 VMThread [stack: 0x04790000,0x047e0000] [id=5488]
0x007ba800 WatcherThread [stack: 0x15a50000,0x15aa0000] [id=6180]
VM state:not at safepoint (normal execution)
VM Mutex/Monitor currently owned by a thread: None
Heap:
def new generation total 4928K, used 3145K [0x04800000, 0x04d50000, 0x09d50000)
eden space 4416K, 71% used [0x04800000, 0x04b12798, 0x04c50000)
from space 512K, 0% used [0x04c50000, 0x04c50000, 0x04cd0000)
to space 512K, 0% used [0x04cd0000, 0x04cd0000, 0x04d50000)
tenured generation total 10944K, used 0K [0x09d50000, 0x0a800000, 0x14800000)
the space 10944K, 0% used [0x09d50000, 0x09d50000, 0x09d50200, 0x0a800000)
Metaspace used 532K, capacity 2664K, committed 2752K, reserved 4480K
Card table byte_map: [0x00ce0000,0x00d70000] byte_map_base: 0x00cbc000
Polling page: 0x000c0000
CodeCache: size=32768Kb used=748Kb max_used=748Kb free=32020Kb
bounds [0x02700000, 0x027c0000, 0x04700000]
total_blobs=203 nmethods=59 adapters=76
compilation: enabled
Compilation events (10 events):
Event: 0.371 Thread 0x00788400 54 java.nio.DirectLongBufferU::ix (10 bytes)
Event: 0.371 Thread 0x00788400 nmethod 54 0x027ba008 code [0x027ba100, 0x027ba190]
Event: 0.382 Thread 0x00788400 56 java.lang.AbstractStringBuilder::expandCapacity (50 bytes)
Event: 0.383 Thread 0x00788400 nmethod 56 0x027ba448 code [0x027ba560, 0x027ba798]
Event: 0.400 Thread 0x00788400 57 java.lang.String::endsWith (17 bytes)
Event: 0.401 Thread 0x00788400 nmethod 57 0x027ba8c8 code [0x027ba9d0, 0x027baa7c]
Event: 0.424 Thread 0x00788400 58 java.lang.String::indexOf (25 bytes)
Event: 0.424 Thread 0x00788400 nmethod 58 0x027bab48 code [0x027bac50, 0x027bad1c]
Event: 0.424 Thread 0x00788400 59 java.util.HashMap::hash (20 bytes)
Event: 0.424 Thread 0x00788400 nmethod 59 0x027bae08 code [0x027baf00, 0x027baf9c]
GC Heap History (0 events):
No events
Deoptimization events (0 events):
No events
Internal exceptions (10 events):
Event: 0.423 Thread 0x00dcc000 Exception <a 'java/security/PrivilegedActionException'> (0x04adeeb0) thrown at [D:\re\puppet\workspace\8-2-build-windows-i586-cygwin\jdk8u11\648\hotspot\src\share\vm\prims\jvm.cpp, line 1248]
Event: 0.423 Thread 0x00dcc000 Exception <a 'java/security/PrivilegedActionException'> (0x04ae0e20) thrown at [D:\re\puppet\workspace\8-2-build-windows-i586-cygwin\jdk8u11\648\hotspot\src\share\vm\prims\jvm.cpp, line 1248]
Event: 0.424 Thread 0x00dcc000 Exception <a 'java/security/PrivilegedActionException'> (0x04ae2d68) thrown at [D:\re\puppet\workspace\8-2-build-windows-i586-cygwin\jdk8u11\648\hotspot\src\share\vm\prims\jvm.cpp, line 1248]
Event: 0.425 Thread 0x00dcc000 Exception <a 'java/security/PrivilegedActionException'> (0x04ae4b50) thrown at [D:\re\puppet\workspace\8-2-build-windows-i586-cygwin\jdk8u11\648\hotspot\src\share\vm\prims\jvm.cpp, line 1248]
Event: 0.425 Thread 0x00dcc000 Exception <a 'java/security/PrivilegedActionException'> (0x04afceb0) thrown at [D:\re\puppet\workspace\8-2-build-windows-i586-cygwin\jdk8u11\648\hotspot\src\share\vm\prims\jvm.cpp, line 1248]
Event: 0.426 Thread 0x00dcc000 Exception <a 'java/security/PrivilegedActionException'> (0x04afef48) thrown at [D:\re\puppet\workspace\8-2-build-windows-i586-cygwin\jdk8u11\648\hotspot\src\share\vm\prims\jvm.cpp, line 1248]
Event: 0.426 Thread 0x00dcc000 Exception <a 'java/security/PrivilegedActionException'> (0x04b00ef0) thrown at [D:\re\puppet\workspace\8-2-build-windows-i586-cygwin\jdk8u11\648\hotspot\src\share\vm\prims\jvm.cpp, line 1248]
Event: 0.429 Thread 0x00dcc000 Exception <a 'java/security/PrivilegedActionException'> (0x04b03080) thrown at [D:\re\puppet\workspace\8-2-build-windows-i586-cygwin\jdk8u11\648\hotspot\src\share\vm\prims\jvm.cpp, line 1248]
Event: 0.430 Thread 0x00dcc000 Exception <a 'java/security/PrivilegedActionException'> (0x04b05ee0) thrown at [D:\re\puppet\workspace\8-2-build-windows-i586-cygwin\jdk8u11\648\hotspot\src\share\vm\prims\jvm.cpp, line 1248]
Event: 0.444 Thread 0x00dcc000 Exception <a 'java/security/PrivilegedActionException'> (0x04b099f8) thrown at [D:\re\puppet\workspace\8-2-build-windows-i586-cygwin\jdk8u11\648\hotspot\src\share\vm\prims\jvm.cpp, line 1248]
Events (10 events):
Event: 0.425 loading class system/IFormattable_
Event: 0.425 loading class system/IFormattable_ done
Event: 0.426 loading class system/__IFormattable
Event: 0.426 loading class system/__IFormattable done
Event: 0.429 loading class system/NotSupportedException
Event: 0.429 loading class system/NotSupportedException done
Event: 0.430 loading class system/NullReferenceException
Event: 0.430 loading class system/NullReferenceException done
Event: 0.444 loading class classlibrary2/Class1
Event: 0.444 loading class classlibrary2/Class1 done
Dynamic libraries:
0x012d0000 - 0x01300000 C:\Program Files (x86)\Java\jre8\bin\javaw.exe
0x77710000 - 0x77890000 C:\Windows\SysWOW64\ntdll.dll
0x75fc0000 - 0x760d0000 C:\Windows\syswow64\kernel32.dll
0x75660000 - 0x756a7000 C:\Windows\syswow64\KERNELBASE.dll
0x760d0000 - 0x76170000 C:\Windows\syswow64\ADVAPI32.dll
0x757a0000 - 0x7584c000 C:\Windows\syswow64\msvcrt.dll
0x75770000 - 0x75789000 C:\Windows\SysWOW64\sechost.dll
0x75560000 - 0x75650000 C:\Windows\syswow64\RPCRT4.dll
0x750b0000 - 0x75110000 C:\Windows\syswow64\SspiCli.dll
0x750a0000 - 0x750ac000 C:\Windows\syswow64\CRYPTBASE.dll
0x75440000 - 0x75540000 C:\Windows\syswow64\USER32.dll
0x752a0000 - 0x75330000 C:\Windows\syswow64\GDI32.dll
0x75430000 - 0x7543a000 C:\Windows\syswow64\LPK.dll
0x751a0000 - 0x7523d000 C:\Windows\syswow64\USP10.dll
0x6f920000 - 0x6fabe000 C:\Windows\WinSxS\x86_microsoft.windows.common-controls_6595b64144ccf1df_6.0.7601.17514_none_41e6975e2bd6f2b2\COMCTL32.dll
0x75330000 - 0x75387000 C:\Windows\syswow64\SHLWAPI.dll
0x75c30000 - 0x75c90000 C:\Windows\system32\IMM32.DLL
0x75b60000 - 0x75c2c000 C:\Windows\syswow64\MSCTF.dll
0x52640000 - 0x526ff000 C:\Program Files (x86)\Java\jre8\bin\msvcr100.dll
0x68230000 - 0x685c7000 C:\Program Files (x86)\Java\jre8\bin\client\jvm.dll
0x74d40000 - 0x74d47000 C:\Windows\system32\WSOCK32.dll
0x753f0000 - 0x75425000 C:\Windows\syswow64\WS2_32.dll
0x75540000 - 0x75546000 C:\Windows\syswow64\NSI.dll
0x74cd0000 - 0x74d02000 C:\Windows\system32\WINMM.dll
0x758e0000 - 0x758e5000 C:\Windows\syswow64\PSAPI.DLL
0x6b830000 - 0x6b83c000 C:\Program Files (x86)\Java\jre8\bin\verify.dll
0x68200000 - 0x68221000 C:\Program Files (x86)\Java\jre8\bin\java.dll
0x681e0000 - 0x681f3000 C:\Program Files (x86)\Java\jre8\bin\zip.dll
0x76520000 - 0x7716a000 C:\Windows\syswow64\SHELL32.dll
0x75e60000 - 0x75fbc000 C:\Windows\syswow64\ole32.dll
0x75280000 - 0x7528b000 C:\Windows\syswow64\profapi.dll
0x52de0000 - 0x52dea000 C:\ws\DLL\jni4net\jni4net.n.w32.v40-0.8.8.0.dll
0x74420000 - 0x7446a000 C:\Windows\SYSTEM32\MSCOREE.DLL
0x743a0000 - 0x7441b000 C:\Windows\Microsoft.NET\Framework\v4.0.30319\mscoreei.dll
0x72450000 - 0x72aeb000 C:\Windows\Microsoft.NET\Framework\v4.0.30319\clr.dll
0x72370000 - 0x72443000 C:\Windows\system32\MSVCR110_CLR0400.dll
0x711b0000 - 0x721de000 C:\Windows\assembly\NativeImages_v4.0.30319_32\mscorlib\ce5f61c5754789df97be8dc991c47d07\mscorlib.ni.dll
0x72250000 - 0x72266000 C:\Windows\system32\CRYPTSP.dll
0x72210000 - 0x7224b000 C:\Windows\system32\rsaenh.dll
0x71060000 - 0x710dd000 C:\Windows\Microsoft.NET\Framework\v4.0.30319\clrjit.dll
0x75ad0000 - 0x75b5f000 C:\Windows\syswow64\OLEAUT32.dll
0x763d0000 - 0x7651a000 C:\Windows\syswow64\urlmon.dll
0x75270000 - 0x75274000 C:\Windows\syswow64\api-ms-win-downlevel-ole32-l1-1-0.dll
0x776e0000 - 0x776e4000 C:\Windows\syswow64\api-ms-win-downlevel-shlwapi-l1-1-0.dll
0x75720000 - 0x75725000 C:\Windows\syswow64\api-ms-win-downlevel-advapi32-l1-1-0.dll
0x75730000 - 0x75734000 C:\Windows\syswow64\api-ms-win-downlevel-user32-l1-1-0.dll
0x75290000 - 0x75294000 C:\Windows\syswow64\api-ms-win-downlevel-version-l1-1-0.dll
0x74e80000 - 0x74e89000 C:\Windows\system32\version.DLL
0x75650000 - 0x75653000 C:\Windows\syswow64\api-ms-win-downlevel-normaliz-l1-1-0.dll
0x75790000 - 0x75793000 C:\Windows\syswow64\normaliz.DLL
0x76170000 - 0x763a2000 C:\Windows\syswow64\iertutil.dll
0x758f0000 - 0x75ac6000 C:\Windows\syswow64\WININET.dll
0x763b0000 - 0x763c7000 C:\Windows\syswow64\USERENV.dll
0x705f0000 - 0x705f8000 C:\Windows\system32\Secur32.dll
0x6c170000 - 0x6c174000 C:\Windows\system32\api-ms-win-downlevel-advapi32-l2-1-0.dll
0x70000000 - 0x70012000 C:\Windows\Microsoft.NET\Framework\v4.0.30319\nlssorting.dll
0x70600000 - 0x70fa4000 C:\Windows\assembly\NativeImages_v4.0.30319_32\System\17a393b77ae757f0768501fb95ff5af6\System.ni.dll
0x70520000 - 0x7052e000 C:\Windows\system32\RpcRtRemote.dll
0x6f820000 - 0x6f90b000 C:\Windows\system32\dbghelp.dll
VM Arguments:
jvm_args: -Dfile.encoding=Cp1252
java_command: jni4net.jni
java_class_path (initial): C:\ws\DLL\jni4net\bin;C:\ws\DLL\jni4net\jni4net.j-0.8.8.0.jar;C:\ws\DLL\jni4net\ClassLibrary2.j4n.jar
Launcher Type: SUN_STANDARD
Environment Variables:
CLASSPATH=.;C:\Program Files (x86)\Java\jre7\lib\ext\QTJava.zip
PATH=C:/Program Files (x86)/Java/jre8/bin/client;C:/Program Files (x86)/Java/jre8/bin;C:/Program Files (x86)/Java/jre8/lib/i386;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\CodeBlocks\MinGW\bin;C:\Program Files (x86)\QuickTime\QTSystem\;C:\Program Files\Microsoft SQL Server\110\Tools\Binn\ ;C:\Program Files\Microsoft SQL Server\110\Tools\Binn\;C:\Program Files (x86)\GitExtensions\;C:\Program Files (x86)\Windows Kits\8.1\Windows Performance Toolkit\;C:\Program Files (x86)\Microsoft SDKs\TypeScript\1.0\;C:\Users\Marco\Desktop\eclipse;
USERNAME=Marco
OS=Windows_NT
PROCESSOR_IDENTIFIER=Intel64 Family 6 Model 42 Stepping 7, GenuineIntel
--------------- S Y S T E M ---------------
OS: Windows 7 , 64 bit Build 7601 Service Pack 1
CPU:total 4 (2 cores per cpu, 2 threads per core) family 6 model 42 stepping 7, cmov, cx8, fxsr, mmx, sse, sse2, sse3, ssse3, sse4.1, sse4.2, popcnt, avx, aes, clmul, ht, tsc, tscinvbit
Memory: 4k page, physical 4072380k(1064400k free), swap 8142896k(4029200k free)
vm_info: Java HotSpot(TM) Client VM (25.11-b03) for windows-x86 JRE (1.8.0_11-b12), built on Jun 16 2014 18:18:58 by "java_re" with MS VC++ 10.0 (VS2010)
time: Wed Feb 04 15:24:40 2015
elapsed time: 0 secondsThe problem is that I can't figure out how to return a value from c# library to Java...
I have also tried to modify the parameter of the function :
public int mult(ref int n)
and then in Java :
Ref<Integer> a = new Ref<Integer>(4);
c.mult(a);
but I seem to get the same error..How can I do?
Thanks in advice, Stefano
asked on Stack Overflow Feb 4, 2015 by 
Stefano Franchini
Stefano Franchini1 Answer
Usually this happens is you changed the signature of the method but forgot to re-generate it with proxygen and recompile the proxy dll/jar. If that doesn't help, please post the generated code as well.
answered on Stack Overflow Feb 4, 2015 by 
Pavel Savara
Pavel SavaraUser contributions licensed under CC BY-SA 3.0