Why can I load Image from jar?

hi,all:
I've packed all gif images into a jar file,it works well on jdk1.4.2_05 with this command:
java -jar pos.jar
but failed on other jdk versions lower than jdk1.4.2_05.
here is the package structure:
├─resource
│ ├─configfile
│ └─images
here is the code getting url:
package resource
public class ResourceLoader {
public ResourceLoader() {
public URL getResource(String fileName){
URL url=ResourceLoader.class.getResource(fileName);
if(null==url){
throw new NullPointerException(fileName+" not found");
return url;
with this url, I will use
toolkit.getImage(url);
to load the image.
exception on 1.4.1_01:
An unexpected exception has been detected in native code outside the VM.
Unexpected Signal : EXCEPTION_ACCESS_VIOLATION occurred at PC=0x6D2835EB
Function=JNI_OnLoad+0x249
Library=C:\j2sdk1.4.1_01\jre\bin\jpeg.dll
Current Java thread:
at sun.awt.image.JPEGImageDecoder.readImage(Native Method)
at sun.awt.image.JPEGImageDecoder.produceImage(JPEGImageDecoder.java:144
at sun.awt.image.InputStreamImageSource.doFetch(InputStreamImageSource.j
ava:257)
at sun.awt.image.ImageFetcher.fetchloop(ImageFetcher.java:168)
at sun.awt.image.ImageFetcher.run(ImageFetcher.java:136)
Dynamic libraries:
0x00400000 - 0x00406000 C:\j2sdk1.4.1_01\bin\java.exe
0x77F80000 - 0x77FFA000 C:\WINNT\system32\ntdll.dll
0x77D90000 - 0x77DEB000 C:\WINNT\system32\ADVAPI32.dll
0x77E60000 - 0x77F32000 C:\WINNT\system32\KERNEL32.dll
0x786F0000 - 0x7875E000 C:\WINNT\system32\RPCRT4.dll
0x78000000 - 0x78046000 C:\WINNT\system32\MSVCRT.dll
0x6D330000 - 0x6D45A000 C:\j2sdk1.4.1_01\jre\bin\client\jvm.dll
0x77DF0000 - 0x77E4F000 C:\WINNT\system32\USER32.dll
0x77F40000 - 0x77F79000 C:\WINNT\system32\GDI32.dll
0x77530000 - 0x77560000 C:\WINNT\system32\WINMM.dll
0x75E00000 - 0x75E1A000 C:\WINNT\system32\IMM32.DLL
0x6C330000 - 0x6C338000 C:\WINNT\system32\LPK.DLL
0x65D20000 - 0x65D74000 C:\WINNT\system32\USP10.dll
0x6D1D0000 - 0x6D1D7000 C:\j2sdk1.4.1_01\jre\bin\hpi.dll
0x6D300000 - 0x6D30D000 C:\j2sdk1.4.1_01\jre\bin\verify.dll
0x6D210000 - 0x6D229000 C:\j2sdk1.4.1_01\jre\bin\java.dll
0x6D320000 - 0x6D32D000 C:\j2sdk1.4.1_01\jre\bin\zip.dll
0x6D000000 - 0x6D0FB000 C:\j2sdk1.4.1_01\jre\bin\awt.dll
0x777C0000 - 0x777DE000 C:\WINNT\system32\WINSPOOL.DRV
0x75010000 - 0x75020000 C:\WINNT\system32\MPR.dll
0x77A30000 - 0x77B1C000 C:\WINNT\system32\ole32.dll
0x6D180000 - 0x6D1D0000 C:\j2sdk1.4.1_01\jre\bin\fontmanager.dll
0x51000000 - 0x51044000 C:\WINNT\system32\ddraw.dll
0x72800000 - 0x72806000 C:\WINNT\system32\DCIMAN32.dll
0x72CF0000 - 0x72D63000 C:\WINNT\system32\D3DIM.DLL
0x6DD30000 - 0x6DD36000 C:\WINNT\system32\INDICDLL.dll
0x53000000 - 0x53007000 C:\PROGRA~1\3721\helper.dll
0x70BD0000 - 0x70C34000 C:\WINNT\system32\SHLWAPI.dll
0x37210000 - 0x3723E000 C:\WINNT\DOWNLO~1\CnsMin.dll
0x777E0000 - 0x777E7000 C:\WINNT\system32\VERSION.dll
0x75950000 - 0x75956000 C:\WINNT\system32\LZ32.DLL
0x12F10000 - 0x12F25000 D:\JBuilder7\lib\ext\jbWheel.dll
0x6D280000 - 0x6D29E000 C:\j2sdk1.4.1_01\jre\bin\jpeg.dll
0x77900000 - 0x77923000 C:\WINNT\system32\imagehlp.dll
0x72960000 - 0x7298D000 C:\WINNT\system32\DBGHELP.dll
0x687E0000 - 0x687EB000 C:\WINNT\system32\PSAPI.DLL
Local Time = Fri Jul 16 10:06:45 2004
Elapsed Time = 2
# The exception above was detected in native code outside the VM
# Java VM: Java HotSpot(TM) Client VM (1.4.1_01-b01 mixed mode)
# An error report file has been saved as hs_err_pid2320.log.
# Please refer to the file for further information.

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