When I use Weblogic 6.0 sp2 on Windows2000 advanced server,I face big problem.After some time of using,the system shut down automatically.
But before thr on-site running.I have used Webload to simulate 30 persons accessing,no problem.

I once face this symptom,then I change the JDK from the embeded 1.3.0 to 1.3.1.But today this problem happens again.

the log file shows
An unexpected exception has been detected in native code outside the VM.
Unexpected Signal : EXCEPTION_ACCESS_VIOLATION occurred at PC=0x77fc9760
Function name=RtlSizeHeap
Library=C:\WINNT\System32\ntdll.dll

Current Java thread:
at java.io.FileInputStream.readBytes(Native Method)
at java.io.FileInputStream.read(FileInputStream.java:178)
at weblogic.utils.classloaders.FileSource.getBytes(FileSource.java:41)
at weblogic.utils.classloaders.GenericClassLoader.findLocalClass(GenericClassLo ader.java:270)
at weblogic.utils.classloaders.GenericClassLoader.findClass(GenericClassLoader. java:155)
at java.lang.ClassLoader.loadClass(ClassLoader.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:250)
at weblogic.servlet.internal.ServletStubImpl.prepareServlet(ServletStubImpl.jav a:521)
at weblogic.servlet.jsp.JspStub.prepareServlet(JspStub.java:191)
at weblogic.servlet.jsp.JspStub.prepareServlet(JspStub.java:148)
at weblogic.servlet.internal.ServletStubImpl.getServlet(ServletStubImpl.java:30 6)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java :208)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java :246)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletCo ntext.java:1265)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java :1631)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:137)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)

Dynamic libraries:
0x00400000 - 0x00405000 C:\jdk1.3.1_06\bin\java.exe
0x77F80000 - 0x77FF9000 C:\WINNT\System32\ntdll.dll
0x77D90000 - 0x77DEA000 C:\WINNT\system32\ADVAPI32.dll
0x77E60000 - 0x77F35000 C:\WINNT\system32\KERNEL32.DLL
0x77D20000 - 0x77D8F000 C:\WINNT\system32\RPCRT4.DLL
0x78000000 - 0x78046000 C:\WINNT\system32\MSVCRT.dll
0x6D420000 - 0x6D4F9000 C:\jdk1.3.1_06\jre\bin\hotspot\jvm.dll
0x77DF0000 - 0x77E54000 C:\WINNT\system32\USER32.dll
0x77F40000 - 0x77F7C000 C:\WINNT\system32\GDI32.DLL
0x77530000 - 0x77560000 C:\WINNT\System32\WINMM.dll
0x75E00000 - 0x75E1A000 C:\WINNT\System32\IMM32.DLL
0x6D220000 - 0x6D227000 C:\jdk1.3.1_06\jre\bin\hpi.dll
0x6D3B0000 - 0x6D3BD000 C:\jdk1.3.1_06\jre\bin\verify.dll
0x6D250000 - 0x6D266000 C:\jdk1.3.1_06\jre\bin\java.dll
0x6D3C0000 - 0x6D3CD000 C:\jdk1.3.1_06\jre\bin\zip.dll
0x6D340000 - 0x6D348000 C:\jdk1.3.1_06\jre\bin\net.dll
0x74FD0000 - 0x74FDA000 C:\WINNT\System32\WSOCK32.dll
0x74FB0000 - 0x74FC4000 C:\WINNT\System32\WS2_32.DLL
0x74FA0000 - 0x74FA8000 C:\WINNT\System32\WS2HELP.DLL
0x77800000 - 0x7780C000 C:\WINNT\System32\rnr20.dll
0x77960000 - 0x77984000 C:\WINNT\System32\DNSAPI.DLL
0x777A0000 - 0x777A8000 C:\WINNT\System32\winrnr.dll
0x77930000 - 0x77959000 C:\WINNT\system32\WLDAP32.DLL
0x777B0000 - 0x777B5000 C:\WINNT\System32\rasadhlp.dll
0x777F0000 - 0x777FE000 C:\WINNT\System32\RTUTILS.DLL
0x74F50000 - 0x74F61000 C:\WINNT\system32\msafd.dll
0x74F90000 - 0x74F97000 C:\WINNT\System32\wshtcpip.dll
0x25830000 - 0x25835000 D:\bea\wlserver6.0\bin\wlntio.dll
0x77900000 - 0x77922000 C:\WINNT\system32\imagehlp.dll
0x72960000 - 0x7298D000 C:\WINNT\system32\DBGHELP.dll
0x687E0000 - 0x687EB000 C:\WINNT\System32\PSAPI.DLL

Local Time = Thu Mar 13 15:51:02 2003
Elapsed Time = 1234
#
# The exception above was detected in native code outside the VM
#
# Java VM: Java HotSpot(TM) Client VM (1.3.1_06-b01 mixed mode)
#


Who can give me instruction will be mostly appreciated.

Thank you very much in advance