UnsatisfiedLinkError, Load Library Successfully, Native Method Not Found

Question

I am using JNI to call a ".dll" file I made on windows.
I got the exception:
Exception in thread "Thread-0" java.lang.UnsatisfiedLinkError: com.aspectgaming.core.io.JniInnocore.Dpci.waitEvent(Ljava/lang/Object;J)I
at com.aspectgaming.core.io.JniInnocore.Dpci.waitEvent(Native Method)
at com.aspectgaming.core.io.JniInnocore.IDLPThread.run(IDLPThread.java:19)
at java.lang.Thread.run(Unknown Source)
The code for loading c dll library:
URL url = Thread.currentThread().getContextClassLoader().getResource("");
String baseClassPath = url.getPath();
System.load(baseClassPath "com/aspectgaming/libjnidpcicore.dll");+
The  ".dll"  file is already loaded,  because when I changed the dll file name to any other ones,  a "library file not found" exception will be caught.
The problem is Dpci.waitEvent and all the native methods could not be found.
I used a PE viewer to view the dll exports I got:
Export table
Characteristics=0, TimeDateStamp=1237366066, MajorVersion=0, MinorVersion=0, Name=36994, Base=1, NumberOfFunctions=9, NumberOfNames=9, AddressOfFunctions=36904, AddressOfNames=36940, AddressOfNameOrdinals=36976,
TimeDateStamp:Wed Mar 18 16:47:46 GMT+08:00 2009
Java_com_aspectgaming_core_io_JniInnocore_Dpci_getEventName@12 (Ordinal: 1, Entry Point RVA: 147ah (5,242))
Java_com_aspectgaming_core_io_JniInnocore_Dpci_getNumOfEvents@8 (Ordinal: 2, Entry Point RVA: 11a5h (4,517))
Java_com_aspectgaming_core_io_JniInnocore_Dpci_getNumOfInputPorts@12 (Ordinal: 3, Entry Point RVA: 1789h (6,025))
Java_com_aspectgaming_core_io_JniInnocore_Dpci_getSramSize@8 (Ordinal: 4, Entry Point RVA: 1190h (4,496))
Java_com_aspectgaming_core_io_JniInnocore_Dpci_readEvent@12 (Ordinal: 5, Entry Point RVA: 11bah (4,538))
Java_com_aspectgaming_core_io_JniInnocore_Dpci_readPort@12 (Ordinal: 6, Entry Point RVA: 17a7h (6,055))
Java_com_aspectgaming_core_io_JniInnocore_Dpci_waitEvent@20 (Ordinal: 7, Entry Point RVA: 14b8h (5,304))
Java_com_aspectgaming_core_io_JniInnocore_Dpci_waitIOPort@24 (Ordinal: 8, Entry Point RVA: 17dbh (6,107))
Java_com_aspectgaming_core_io_JniInnocore_Dpci_writePort@16 (Ordinal: 9, Entry Point RVA: 182ch (6,188))
The java class "Dpci" is exactly in this package : com.aspectgaming.core.io.JniInnocore;
I compiled it by gcc on linux as a ".so" file and everything is working on linux.
On windows I am compiling this by Mingw gcc.
Here is the make file on Windows which is used by Mingw32-make:
dpci_core:
gcc -o ../../../java/com/aspectgaming/libjnidpcicore.dll -shared -IC:\jdk1.6.0_10\include -IC:\jdk1.6.0_10\include\win32 -I'D:\Program Files\Innocore Gaming Ltd\DirectPCI SDK & Run-time\include' dpci_core.c libdpci_static.lib
dpci_core.c is my code file and  libdpci_static.lib is the library that my c dll will depend on.
Any thought to this UnsatisfiedLinkError exception problem?
Thanks!

Answer 1

I recompile my codes under visual c++ 2008 express on Windows XP professional, and I have already got rid of this problem.
But when I move the compiled java jar application to windows xp embedded edition, an exception will be caught:
C:\AspectGamingCore>java -jar Aspect.jar
Exception in thread "main" java.lang.UnsatisfiedLinkError: C:\AspectGamingCore\l
ib\libjnidpcicore.dll: This application has failed to start because the applicat
ion configuration is incorrect. Reinstalling the application may fix this proble
m
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at java.lang.ClassLoader.loadLibrary0(Unknown Source)
at java.lang.ClassLoader.loadLibrary(Unknown Source)
at java.lang.Runtime.load0(Unknown Source)
at java.lang.System.load(Unknown Source)
at com.aspectgaming.core.io.JniInnocore.Dpci.loadLibraryOnWindows(Unknow
n Source)
at com.aspectgaming.core.io.JniInnocore.DpciTest.main(Unknown Source)
I don't know if there is any compatible problem bewteen xp and xpe but one possible reason is that xpe may be lack of some dll files like msvcr90.dll.
So I tried to compile the dll as static library in vc++2008, but this does not run even on my winxp professional:
Exception in thread "main" java.lang.UnsatisfiedLinkError: C:\AspectGamingCore\l
ib\libjnidpcicore.dll: %1 is not a valid Win32 application
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at java.lang.ClassLoader.loadLibrary0(Unknown Source)
at java.lang.ClassLoader.loadLibrary(Unknown Source)
at java.lang.Runtime.load0(Unknown Source)
at java.lang.System.load(Unknown Source)
at com.aspectgaming.core.io.JniInnocore.Dpci.loadLibraryOnWindows(Unknow
n Source)
at com.aspectgaming.core.io.JniInnocore.DpciTest.main(Unknown Source)
Could JNI call a c static library? Why it says "not a valid Win32 application"?