We are running performance tests of the Sentences product using J2SE version 1.4.0_01, and Windows NT Server (will soon upgrade to Windows 2000). The hardware is a dual-processor 1GHz Dell server. Our current focus is to understand the importance of JVM parameters on Sentences performance. One option in particular is "-server", which offers significant benefits for a large server application such as ours. 

When we were still using Java 1.3.1, the combination of "-server" and two processors was unstable. We had a number of intermittent and unpredictable errors, which is why we upgraded to Java 1.4.0_01. Using this, the previous errors disappeared, and we were happy to recommend this combination to our customers.

This week, a data load program failed with a JVM error using Java 1.4.0_01 with the -server option. 

Unexpected Signal : EXCEPTION_ACCESS_VIOLATION occurred at PC=0x6D5459EA
Function=JVM_RegisterUnsafeMethods+0x19AEA
Library=C:\j2sdk1.4.0_01\jre\bin\server\jvm.dll

Current Java thread:
        at com.sentences.db.w.Hd(Unknown Source)
        at com.sentences.profile.distribution.di.Jk(Unknown Source)
        at com.sentences.profile.distribution.di.Ek(Unknown Source)
        at com.sentences.profile.distribution.pi.Ad(Unknown Source)
        at com.sentences.base.zr.hasNext(Unknown Source)
        at com.sentences.profile.distribution.ai.Qk(Unknown Source)
        at com.sentences.profile.distribution.ai.<init>(Unknown Source)
        at com.sentences.profile.distribution.ii.nm(Unknown Source)
        at com.sentences.profile.pl.Nq(Unknown Source)
        at com.sentences.server.things.gw.gbd(Unknown Source)
        at com.sentences.server.things.gw.fbd(Unknown Source)
        at com.sentences.server.things.zu.getByName(Unknown Source)
        at com.sentences.server.things.zu.getByName(Unknown Source)
        at com.sentences.server.things.zu.getOrCreateInstance(Unknown Source)
        at com.sentences.export.jo.JM(Unknown Source)
        at com.sentences.export.ImportCSV.OQ(Unknown Source)
        at com.sentences.export.ImportCSV.zQ(Unknown Source)
        at com.sentences.export.ImportCSV.yQ(Unknown Source)
        at com.sentences.export.ImportCSV.main(Unknown Source)

Dynamic libraries:
0x00400000 - 0x00406000         C:\j2sdk1.4.0_01\jre\bin\java.exe
0x77F60000 - 0x77FBE000         C:\WINNT\System32\ntdll.dll
0x77DC0000 - 0x77DFF000         C:\WINNT\system32\ADVAPI32.dll
0x77F00000 - 0x77F5E000         C:\WINNT\system32\KERNEL32.dll
0x77E70000 - 0x77EC5000         C:\WINNT\system32\USER32.dll
0x77ED0000 - 0x77EFC000         C:\WINNT\system32\GDI32.dll
0x77E10000 - 0x77E67000         C:\WINNT\system32\RPCRT4.dll
0x78000000 - 0x78044000         C:\WINNT\system32\MSVCRT.dll
0x6D450000 - 0x6D6AD000         C:\j2sdk1.4.0_01\jre\bin\server\jvm.dll
0x77FD0000 - 0x77FFA000         C:\WINNT\System32\WINMM.dll
0x6D1D0000 - 0x6D1D7000         C:\j2sdk1.4.0_01\jre\bin\hpi.dll
0x6D300000 - 0x6D30D000         C:\j2sdk1.4.0_01\jre\bin\verify.dll
0x6D210000 - 0x6D228000         C:\j2sdk1.4.0_01\jre\bin\java.dll
0x6D320000 - 0x6D32D000         C:\j2sdk1.4.0_01\jre\bin\zip.dll
0x6D2D0000 - 0x6D2DD000         C:\j2sdk1.4.0_01\jre\bin\net.dll
0x776D0000 - 0x776D8000         C:\WINNT\system32\WSOCK32.dll
0x776B0000 - 0x776C4000         C:\WINNT\system32\WS2_32.dll
0x776A0000 - 0x776A7000         C:\WINNT\system32\WS2HELP.dll
0x74FF0000 - 0x74FFE000         C:\WINNT\System32\rnr20.dll
0x77BF0000 - 0x77BF7000         C:\WINNT\System32\rpcltc1.dll
0x76AC0000 - 0x76ADD000         C:\WINNT\System32\imagehlp.dll
0x71DC0000 - 0x71DCA000         C:\WINNT\System32\PSAPI.DLL

Local Time = Mon Aug 05 15:58:22 2002
Elapsed Time = 31
#
# HotSpot Virtual Machine Error : EXCEPTION_ACCESS_VIOLATION
# Error ID : 4F530E43505002D5
# Please report this error at
# http://java.sun.com/cgi-bin/bugreport.cgi
#
# Java VM: Java HotSpot(TM) Server VM (1.4.0_01-b03 mixed mode)
#