我是JNI的新手并尝试使用Windows 7和cygwin的gcc编译器来使用简单的Hello World程序。以下是各个组成部分：
Hello.java：
public class Hello {
public static native void sayHello();
public static void main( String[] args ) {
System.loadLibrary( "Hello" );
sayHello();
} // end main
} // end class Hello
然后我执行以下命令列表来构建.h文件：
javac Hello.java
javah Hello
这会自动构建Hello.h文件。为了完整起见，请点击此处：
/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class Hello */
#ifndef _Included_Hello
#define _Included_Hello
#ifdef __cplusplus
extern "C" {
#endif
/*
* Class: Hello
* Method: sayHello
* Signature: ()V
*/
JNIEXPORT void JNICALL Java_Hello_sayHello
(JNIEnv *, jclass);
#ifdef __cplusplus
}
#endif
#endif
然后构建相应的Hello.c文件：
#include <stdio.h>
#include "Hello.h"
JNIEXPORT void JNICALL Java_Hello_sayHello( JNIEnv *env, jclass c ) {
printf( "Hello World\n" );
}
然后，我使用以下命令编译/链接c代码：
gcc -I/cygdrive/c/Java/jdk1.8.0_45/include -I/cygdrive/c/Java/jdk1.8.0_45/include/win32 -Wl,--add-stdcall-alias -shared -o Hello.dll Hello.c
最后，我重新编译了java文件。 （我真的需要这样做吗？）：
javac Hello.java
我使用这个Makefile（我也是构建Makefile的新手）用一个make命令完成所有步骤：
CC=gcc
CFLAGS=
LDFLAGS=
JAVALIB="/cygdrive/C/Java/jdk1.8.0_45/include"
JAVALIBWIN32="$(JAVALIB)/win32"
all: Hello.dll
javac Hello.java
Hello.dll: Hello.h
$(CC) -I$(JAVALIB) -I$(JAVALIBWIN32) -Wl,--add-stdcall-alias -shared -o Hello.dll Hello.c
Hello.h: Hello.class
rm -f Hello.h
javah Hello
Hello.class: Hello.java
javac Hello.java
clean:
@rm -f *.dll *.class
一旦我执行程序（使用命令＆＃34; java Hello＆＃34;），我收到此错误：
$ java Hello
#
# A fatal error has been detected by the Java Runtime Environment:
#
# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x00000001800f9309, pid=7292, tid=5616
#
# JRE version: Java(TM) SE Runtime Environment (8.0_45-b14) (build 1.8.0_45-b14)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (25.45-b02 mixed mode windows-amd64 compressed oops)
# Problematic frame:
# C [cygwin1.dll+0xb9309]
#
# 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:\dev\JNI\hs_err_pid7292.log
#
# If you would like to submit a bug report, please visit:
# http://bugreport.java.com/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#
并且，结果错误日志如下所示：
#
# A fatal error has been detected by the Java Runtime Environment:
#
# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x00000001800f9309, pid=7292, tid=5616
#
# JRE version: Java(TM) SE Runtime Environment (8.0_45-b14) (build 1.8.0_45-b14)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (25.45-b02 mixed mode windows-amd64 compressed oops)
# Problematic frame:
# C [cygwin1.dll+0xb9309]
#
# Failed to write core dump. Minidumps are not enabled by default on client versions of Windows
#
# If you would like to submit a bug report, please visit:
# http://bugreport.java.com/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 (0x000000000253e000): JavaThread "main" [_thread_in_native, id=5616, stack(0x0000000002830000,0x0000000002930000)]
siginfo: ExceptionCode=0xc0000005, reading address 0x0000000000000030
Registers:
RAX=0x00000000002c0000, RBX=0x0000000000000001, RCX=0x00000000002c0000, RDX=0x0000000000000000
RSP=0x000000000292f0e0, RBP=0x000000000292f1d0, RSI=0x000000000292f14c, RDI=0x000000000292f14c
R8 =0x000000000292f14c, R9 =0x8080808080808080, R10=0xfefefefefefefeff, R11=0x0000000551bc10ac
R12=0x0000000000000000, R13=0x000000000cf70258, R14=0x000000000292f258, R15=0x000000000253e000
RIP=0x00000001800f9309, EFLAGS=0x0000000000010206
Top of Stack: (sp=0x000000000292f0e0)
0x000000000292f0e0: 000000000cf70258 0000000000000000
0x000000000292f0f0: 000000000292f1b0 00000000701e8e37
0x000000000292f100: 000000000292f1b0 0000003200390032
0x000000000292f110: 000000000292d680 0000000180185145
0x000000000292f120: 000000000cf70258 000000000253e000
0x000000000292f130: 000000000253e000 0000000002577cd0
0x000000000292f140: 000000000cf70258 000000000292f258
0x000000000292f150: 000000000292f170 0000000000000002
0x000000000292f160: 000000000000000c 000000007013a904
0x000000000292f170: 0000000551bc3030 000000000000000b
0x000000000292f180: 00000001802653c0 0000000000000001
0x000000000292f190: 000000000cf70258 0000000040000020
0x000000000292f1a0: 000000000f017ced 000000018011ae5b
0x000000000292f1b0: 0000000040000000 000000000253e000
0x000000000292f1c0: 000000000cf70258 0000000040000020
0x000000000292f1d0: 000000000292f240 000000000f025e34
Instructions: (pc=0x00000001800f9309)
0x00000001800f92e9: 1f 84 00 00 00 00 00 56 53 48 83 ec 28 89 cb 48
0x00000001800f92f9: 89 d6 e8 d0 4b 04 00 48 8b 10 49 89 f0 48 89 c1
0x00000001800f9309: 4c 8b 4a 30 89 da 48 83 c4 28 5b 5e 49 ff e1 0f
0x00000001800f9319: 1f 84 00 00 00 00 00 56 53 48 83 ec 28 89 cb 48
Register to memory mapping:
RAX=0x00000000002c0000 is an unknown value
RBX=0x0000000000000001 is an unknown value
RCX=0x00000000002c0000 is an unknown value
RDX=0x0000000000000000 is an unknown value
RSP=0x000000000292f0e0 is pointing into the stack for thread: 0x000000000253e000
RBP=0x000000000292f1d0 is pointing into the stack for thread: 0x000000000253e000
RSI=0x000000000292f14c is pointing into the stack for thread: 0x000000000253e000
RDI=0x000000000292f14c is pointing into the stack for thread: 0x000000000253e000
R8 =0x000000000292f14c is pointing into the stack for thread: 0x000000000253e000
R9 =0x8080808080808080 is an unknown value
R10=0xfefefefefefefeff is an unknown value
R11=0x0000000551bc10ac is an unknown value
R12=0x0000000000000000 is an unknown value
R13={method} {0x000000000cf70260} 'sayHello' '()V' in 'Hello'
R14=0x000000000292f258 is pointing into the stack for thread: 0x000000000253e000
R15=0x000000000253e000 is a thread
Stack: [0x0000000002830000,0x0000000002930000], sp=0x000000000292f0e0, free space=1020k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
C [cygwin1.dll+0xb9309]
C [cygwin1.dll+0x145145]
C [cygwin1.dll+0xdae5a]
C 0x0000000040000000
Java frames: (J=compiled Java code, j=interpreted, Vv=VM code)
j Hello.sayHello()V+0
j Hello.main([Ljava/lang/String;)V+5
v ~StubRoutines::call_stub
--------------- P R O C E S S ---------------
Java Threads: ( => current thread )
0x000000001e093800 JavaThread "Service Thread" daemon [_thread_blocked, id=8452, stack(0x000000000ecc0000,0x000000000edc0000)]
0x000000001e011000 JavaThread "C1 CompilerThread2" daemon [_thread_blocked, id=2924, stack(0x000000001e460000,0x000000001e560000)]
0x000000000d56f000 JavaThread "C2 CompilerThread1" daemon [_thread_blocked, id=7784, stack(0x000000000ee60000,0x000000000ef60000)]
0x000000000d566800 JavaThread "C2 CompilerThread0" daemon [_thread_blocked, id=6812, stack(0x000000000eba0000,0x000000000eca0000)]
0x000000000d563000 JavaThread "Attach Listener" daemon [_thread_blocked, id=3936, stack(0x000000000e9c0000,0x000000000eac0000)]
0x000000000d561800 JavaThread "Signal Dispatcher" daemon [_thread_blocked, id=432, stack(0x000000000e590000,0x000000000e690000)]
0x000000000d507000 JavaThread "Finalizer" daemon [_thread_blocked, id=7632, stack(0x000000000e8b0000,0x000000000e9b0000)]
0x000000000d500000 JavaThread "Reference Handler" daemon [_thread_blocked, id=4284, stack(0x000000000e690000,0x000000000e790000)]
=>0x000000000253e000 JavaThread "main" [_thread_in_native, id=5616, stack(0x0000000002830000,0x0000000002930000)]
Other Threads:
0x000000000d4fa800 VMThread [stack: 0x000000000e490000,0x000000000e590000] [id=8520]
0x000000001e097800 WatcherThread [stack: 0x000000001e620000,0x000000001e720000] [id=3404]
VM state:not at safepoint (normal execution)
VM Mutex/Monitor currently owned by a thread: None
Heap:
PSYoungGen total 76288K, used 2621K [0x000000076b200000, 0x0000000770700000, 0x00000007c0000000)
eden space 65536K, 4% used [0x000000076b200000,0x000000076b48f680,0x000000076f200000)
from space 10752K, 0% used [0x000000076fc80000,0x000000076fc80000,0x0000000770700000)
to space 10752K, 0% used [0x000000076f200000,0x000000076f200000,0x000000076fc80000)
ParOldGen total 175104K, used 0K [0x00000006c1600000, 0x00000006cc100000, 0x000000076b200000)
object space 175104K, 0% used [0x00000006c1600000,0x00000006c1600000,0x00000006cc100000)
Metaspace used 2341K, capacity 4486K, committed 4864K, reserved 1056768K
class space used 261K, capacity 386K, committed 512K, reserved 1048576K
Card table byte_map: [0x0000000002fc0000,0x00000000037c0000] byte_map_base: 0xffffffffff9b5000
Marking Bits: (ParMarkBitMap*) 0x0000000070814040
Begin Bits: [0x0000000004420000, 0x00000000083c8000)
End Bits: [0x00000000083c8000, 0x000000000c370000)
Polling page: 0x0000000000250000
CodeCache: size=245760Kb used=1084Kb max_used=1084Kb free=244675Kb
bounds [0x000000000f010000, 0x000000000f280000, 0x000000001e010000]
total_blobs=247 nmethods=17 adapters=144
compilation: enabled
Compilation events (10 events):
Event: 0.050 Thread 0x000000001e011000 6 3 java.lang.AbstractStringBuilder::ensureCapacityInternal (16 bytes)
Event: 0.050 Thread 0x000000001e011000 nmethod 6 0x000000000f11bad0 code [0x000000000f11bc40, 0x000000000f11be88]
Event: 0.050 Thread 0x000000001e011000 14 3 java.lang.AbstractStringBuilder::append (29 bytes)
Event: 0.051 Thread 0x000000001e011000 nmethod 14 0x000000000f11d250 code [0x000000000f11d3c0, 0x000000000f11d6c8]
Event: 0.051 Thread 0x000000001e011000 15 s 3 java.lang.StringBuffer::append (13 bytes)
Event: 0.051 Thread 0x000000001e011000 nmethod 15 0x000000000f11d850 code [0x000000000f11d9e0, 0x000000000f11dee8]
Event: 0.051 Thread 0x000000001e011000 16 3 java.io.WinNTFileSystem::isSlash (18 bytes)
Event: 0.051 Thread 0x000000001e011000 nmethod 16 0x000000000f11e110 code [0x000000000f11e260, 0x000000000f11e450]
Event: 0.055 Thread 0x000000001e011000 17 3 java.lang.String::equals (81 bytes)
Event: 0.055 Thread 0x000000001e011000 nmethod 17 0x000000000f11e8d0 code [0x000000000f11ea60, 0x000000000f11efb0]
GC Heap History (0 events):
No events
Deoptimization events (0 events):
No events
Internal exceptions (2 events):
Event: 0.026 Thread 0x000000000253e000 Exception <a 'java/lang/NoSuchMethodError': Method sun.misc.Unsafe.defineClass(Ljava/lang/String;[BII)Ljava/lang/Class; name or signature does not match> (0x000000076b20cdf0) thrown at [C:\re\workspace\8-2-build-windows-amd64-cygwin\jdk8u45\3457\hotspot\srƒfÎÝ‘š?
Event: 0.026 Thread 0x000000000253e000 Exception <a 'java/lang/NoSuchMethodError': Method sun.misc.Unsafe.prefetchRead(Ljava/lang/Object;J)V name or signature does not match> (0x000000076b20d080) thrown at [C:\re\workspace\8-2-build-windows-amd64-cygwin\jdk8u45\3457\hotspot\src\share\vm\prims\jÐW
Events (10 events):
Event: 0.054 loading class java/security/BasicPermissionCollection
Event: 0.054 loading class java/security/BasicPermissionCollection done
Event: 0.054 loading class sun/launcher/LauncherHelper$FXHelper
Event: 0.054 loading class sun/launcher/LauncherHelper$FXHelper done
Event: 0.054 loading class java/lang/Class$MethodArray
Event: 0.054 loading class java/lang/Class$MethodArray done
Event: 0.054 loading class java/lang/Void
Event: 0.054 loading class java/lang/Void done
Event: 0.054 loading class java/lang/ClassLoaderHelper
Event: 0.054 loading class java/lang/ClassLoaderHelper done
Dynamic libraries:
0x000000013fbd0000 - 0x000000013fc07000 C:\Java\jdk1.8.0_45\bin\java.exe
0x0000000076df0000 - 0x0000000076f98000 C:\Windows\SYSTEM32\ntdll.dll
0x0000000076bd0000 - 0x0000000076cef000 C:\Windows\system32\kernel32.dll
0x000007fefcdd0000 - 0x000007fefce3c000 C:\Windows\system32\KERNELBASE.dll
0x00000000748b0000 - 0x0000000074945000 C:\Windows\System32\SYSFER.DLL
0x000007fefe7e0000 - 0x000007fefe8bb000 C:\Windows\system32\ADVAPI32.dll
0x000007fefdd00000 - 0x000007fefdd9f000 C:\Windows\system32\msvcrt.dll
0x000007fefeb10000 - 0x000007fefeb2f000 C:\Windows\SYSTEM32\sechost.dll
0x000007fefe6b0000 - 0x000007fefe7dd000 C:\Windows\system32\RPCRT4.dll
0x0000000076cf0000 - 0x0000000076dea000 C:\Windows\system32\USER32.dll
0x000007fefeaa0000 - 0x000007fefeb07000 C:\Windows\system32\GDI32.dll
0x000007fefe640000 - 0x000007fefe64e000 C:\Windows\system32\LPK.dll
0x000007fefef90000 - 0x000007feff059000 C:\Windows\system32\USP10.dll
0x000007fefb510000 - 0x000007fefb704000 C:\Windows\WinSxS\amd64_microsoft.windows.common-controls_6595b64144ccf1df_6.0.7601.17514_none_fa396087175ac9ac\COMCTL32.dll
0x000007fefe000000 - 0x000007fefe071000 C:\Windows\system32\SHLWAPI.dll
0x000007fefe320000 - 0x000007fefe34e000 C:\Windows\system32\IMM32.DLL
0x000007fefe080000 - 0x000007fefe189000 C:\Windows\system32\MSCTF.dll
0x000007fefcae0000 - 0x000007fefcb11000 C:\Windows\system32\nvinitx.dll
0x000007fefcad0000 - 0x000007fefcadc000 C:\Windows\system32\VERSION.dll
0x000000000f000000 - 0x000000000f006000 C:\Program Files\NVIDIA Corporation\CoProcManager\detoured.dll
0x000007fef9e90000 - 0x000007fef9ec1000 C:\Program Files\NVIDIA Corporation\CoProcManager\nvd3d9wrapx.dll
0x000007fefe8c0000 - 0x000007fefea97000 C:\Windows\system32\SETUPAPI.dll
0x000007fefcd90000 - 0x000007fefcdc6000 C:\Windows\system32\CFGMGR32.dll
0x000007fefe230000 - 0x000007fefe307000 C:\Windows\system32\OLEAUT32.dll
0x000007fefddf0000 - 0x000007fefdff3000 C:\Windows\system32\ole32.dll
0x000007fefce40000 - 0x000007fefce5a000 C:\Windows\system32\DEVOBJ.dll
0x000007fef9e60000 - 0x000007fef9e82000 C:\Program Files\NVIDIA Corporation\CoProcManager\nvdxgiwrapx.dll
0x000000005b3d0000 - 0x000000005b4a2000 C:\Java\jdk1.8.0_45\bin\msvcr100.dll
0x0000000070010000 - 0x0000000070893000 C:\Java\jdk1.8.0_45\bin\server\jvm.dll
0x000007fef6650000 - 0x000007fef6659000 C:\Windows\system32\WSOCK32.dll
0x000007fefdda0000 - 0x000007fefdded000 C:\Windows\system32\WS2_32.dll
0x000007fefe310000 - 0x000007fefe318000 C:\Windows\system32\NSI.dll
0x000007fefa7c0000 - 0x000007fefa7fb000 C:\Windows\system32\WINMM.dll
0x0000000076fc0000 - 0x0000000076fc7000 C:\Windows\system32\PSAPI.DLL
0x0000000071370000 - 0x000000007137f000 C:\Java\jdk1.8.0_45\bin\verify.dll
0x0000000071170000 - 0x0000000071199000 C:\Java\jdk1.8.0_45\bin\java.dll
0x0000000066750000 - 0x0000000066766000 C:\Java\jdk1.8.0_45\bin\zip.dll
0x000007fefcf70000 - 0x000007fefdcf9000 C:\Windows\system32\SHELL32.dll
0x000007fefcbb0000 - 0x000007fefcbbf000 C:\Windows\system32\profapi.dll
0x0000000551bc0000 - 0x0000000551bd8000 C:\dev\JNI\Hello.dll
0x0000000180040000 - 0x0000000180600000 C:\cygwin64\bin\cygwin1.dll
0x000007fef40d0000 - 0x000007fef41f5000 C:\Windows\system32\dbghelp.dll
VM Arguments:
java_command: Hello
java_class_path (initial): .
Launcher Type: SUN_STANDARD
Environment Variables:
JAVA_HOME=C:\Java\jdk1.8.0_45
PATH=C:\cygwin64\usr\local\bin;C:\cygwin64\bin;C:\ProgramData\Oracle\Java\javapath;C:\Java\jdk1.8.0_45\bin;C:\Program Files (x86)\Intel\iCLS Client;C:\Program Files\Intel\iCLS Client;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files\Intel\WiFi\bin;C:\Program Files\Common Files\Intel\WirelessCommon;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;C:\cygwin64\bin;C:\bin;.;C:\cygwin64\lib\lapack
USERNAME=gary.valley
SHELL=/bin/bash
OS=Windows_NT
PROCESSOR_IDENTIFIER=Intel64 Family 6 Model 69 Stepping 1, GenuineIntel
--------------- S Y S T E M ---------------
OS: Windows 7 , 64 bit Build 7601 (6.1.7601.18409)
CPU:total 4 (2 cores per cpu, 2 threads per core) family 6 model 69 stepping 1, cmov, cx8, fxsr, mmx, sse, sse2, sse3, ssse3, sse4.1, sse4.2, popcnt, avx, avx2, aes, clmul, erms, lzcnt, ht, tsc, tscinvbit, bmi1, bmi2
Memory: 4k page, physical 16680200k(12576164k free), swap 33358544k(28455468k free)
vm_info: Java HotSpot(TM) 64-Bit Server VM (25.45-b02) for windows-amd64 JRE (1.8.0_45-b14), built on Apr 10 2015 10:34:15 by "java_re" with MS VC++ 10.0 (VS2010)
time: Thu Apr 23 22:46:03 2015
elapsed time: 0 seconds (0d 0h 0m 0s)
我已经从这个site开始逐行地遵循指南了。我唯一无法复制的是-mno-cygwin选项，因为我使用gcc版本4.9.2并且该选项无法识别。
有人能指出我正确的方向吗？非常感谢！
答案 0 :(得分：2)
这绝对是Cygwin环境。我转到了Ubuntu发行版，链接指南就像宣传的一样。