Preventing the Java stack crashing due to memory issues

Hi all,
We have a SAP PI 7.0 installation and we have encountered issues with Java mappings utilizing all available memory on the Java stack and causing the server to slow and eventually crash. The original issue was caused by a poorly coded map, but as this is a large installation we want to protect ourselves against any other poor coding that may be on the system or introduced later.
Are there any configuration options within the WEB AS whereby we can either limit the amount of memory available to the execution of any one mapping, or that will enable the server to stop processing once a set limit is reached?
Any help will be much appreciated.
Many thanks
Ian

HI,
Pls find the below links about javastack
http://help.sap.com/saphelp_nw04/helpdata/en/14/80243b4a66ae0ce10000000a11402f/frameset.htm
http://help.sap.com/saphelp_nw04/helpdata/en/14/80243b4a66ae0ce10000000a11402f/frameset.htm
pls find the below links for java stack trouble shooting.
https://www.sdn.sap.com/irj/sdn/wiki?path=/display/jsts/(Kernel)OOM
https://www.sdn.sap.com/irj/sdn/wiki?path=/display/jsts/commonissues__vmsettings
Reward points if needful.
Thanks,
RamuV

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HI,
Pls find the below links about javastack
http://help.sap.com/saphelp_nw04/helpdata/en/14/80243b4a66ae0ce10000000a11402f/frameset.htm
http://help.sap.com/saphelp_nw04/helpdata/en/14/80243b4a66ae0ce10000000a11402f/frameset.htm
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https://www.sdn.sap.com/irj/sdn/wiki?path=/display/jsts/(Kernel)OOM
https://www.sdn.sap.com/irj/sdn/wiki?path=/display/jsts/commonissues__vmsettings
Reward points if needful.
Thanks,
RamuV

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Hi All
I have a Java application that calls APIs in a 3rd party DLL(I don't have access to its source code or logs) through my VC++ DLL(Win32) that acts as the wrapper DLL.
The Application has many functionalities and is based on multithreading (both on Java layer as well as C++ layer). Most of the functionalities are working , but when I try to close the application, it crashes.
Moreover the crashing occurs inconstently, sometimes it does not crash. Instead of showing any debug information , it simply creates a error file with disassembly code that I am not able to understand.
Though the error seems like an java error, but actually it seems to be due to native code. I have try catch blocks in my code and also implemented settranslator functionality to get hold of structured/C exceptions. But still I am not able to catch any exceptions.
I am pasting the the contents of the file here:
# An unexpected error has been detected by HotSpot Virtual Machine:
# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x7c9111de, pid=488, tid=1848
# Java VM: Java HotSpot(TM) Client VM (1.4.2_14-b05 mixed mode)
# Problematic frame:
# C [ntdll.dll+0x111de]
--------------- T H R E A D ---------------
Current thread (0x009d1790): JavaThread "CompilerThread0" daemon [_thread_in_native, id=1848]
siginfo: ExceptionCode=0xc0000005, reading address 0x00000001
Registers:
EAX=0x00000001, EBX=0x00030000, ECX=0x02d17a18, EDX=0x00030278
ESP=0x02c2f8e8, EBP=0x02c2fb08, ESI=0x02d17a10, EDI=0x00000001
EIP=0x7c9111de, EFLAGS=0x00010202
Top of Stack: (sp=0x02c2f8e8)
0x02c2f8e8: 009fa9a0 000000c0 00000008 0811d3d8
0x02c2f8f8: 0000000c 00a2c0e0 00000003 00000004
0x02c2f908: 08018216 00000001 02c2fcc4 08018385
0x02c2f918: 00000002 00000001 02c2f93c 02d06d0c
0x02c2f928: 0802a50a 00000000 00000001 02c2f93c
0x02c2f938: 04a3cb4c 02d01008 02c2f964 0802a850
0x02c2f948: 02c2f96e 00000000 00000007 00000000
0x02c2f958: 04a3cb38 00000004 08018216 00000001
Instructions: (pc=0x7c9111de)
0x7c9111ce: 39 89 bd 0c ff ff ff 8b 46 0c 89 85 68 ff ff ff
0x7c9111de: 8b 10 3b 57 04 0f 85 8c 31 02 00 3b d1 0f 85 84
Stack: [0x02bf0000,0x02c30000), sp=0x02c2f8e8, free space=254k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
C [ntdll.dll+0x111de]
C [MSVCRT.dll+0x1c3c9]
C [MSVCRT.dll+0x1c3e7]
C [MSVCRT.dll+0x1c42e]
V [jvm.dll+0xacda9]
V [jvm.dll+0x17102]
V [jvm.dll+0x16c8d]
V [jvm.dll+0x16dca]
V [jvm.dll+0x170a7]
V [jvm.dll+0x172e8]
V [jvm.dll+0x4dc65]
V [jvm.dll+0x4d894]
V [jvm.dll+0xd3a36]
V [jvm.dll+0xd3a04]
C [MSVCRT.dll+0x2a3b0]
C [kernel32.dll+0xb683]
Current CompileTask:
HotSpot Client Compiler:423 b sun.awt.AWTAutoShutdown.isReadyToShutdown()Z (33 bytes)
--------------- P R O C E S S ---------------
Java Threads: ( => current thread )
0x049d6328 JavaThread "Thread-19" [_thread_blocked, id=1440]
0x049d24d0 JavaThread "Thread-18" [_thread_blocked, id=3620]
0x049d40c8 JavaThread "Thread-17" [_thread_blocked, id=2476]
0x02df0538 JavaThread "TimerQueue" daemon [_thread_blocked, id=3876]
0x00036a78 JavaThread "DestroyJavaVM" [_thread_blocked, id=2448]
0x02e43768 JavaThread "Thread-6" [_thread_blocked, id=3664]
0x02e23130 JavaThread "Thread-4" [_thread_blocked, id=2816]
0x02e21d08 JavaThread "Thread-2" [_thread_blocked, id=3344]
0x02da3f78 JavaThread "Java2D Disposer" daemon [_thread_blocked, id=2528]
0x02da3268 JavaThread "AWT-EventQueue-0" [_thread_in_native, id=4008]
0x02d91f90 JavaThread "AWT-Windows" daemon [_thread_blocked, id=648]
0x02d3a478 JavaThread "AWT-Shutdown" [_thread_blocked, id=2988]
=>0x009d1790 JavaThread "CompilerThread0" daemon [_thread_in_native, id=1848]
0x009d0a90 JavaThread "Signal Dispatcher" daemon [_thread_blocked, id=3568]
0x009ce128 JavaThread "Finalizer" daemon [_thread_blocked, id=1824]
0x009ccda0 JavaThread "Reference Handler" daemon [_thread_blocked, id=3280]
Other Threads:
0x00a0b6e8 VMThread [id=608]
0x00a0d620 WatcherThread [id=3012]
VM state:not at safepoint (normal execution)
VM Mutex/Monitor currently owned by a thread: None
Heap
def new generation total 640K, used 583K [0x10010000, 0x100c0000, 0x104f0000)
eden space 576K, 90% used [0x10010000, 0x10091e40, 0x100a0000)
from space 64K, 99% used [0x100b0000, 0x100bfff8, 0x100c0000)
to space 64K, 0% used [0x100a0000, 0x100a0000, 0x100b0000)
tenured generation total 7772K, used 5451K [0x104f0000, 0x10c87000, 0x14010000)
the space 7772K, 70% used [0x104f0000, 0x10a42d80, 0x10a42e00, 0x10c87000)
compacting perm gen total 8192K, used 8137K [0x14010000, 0x14810000, 0x18010000)
the space 8192K, 99% used [0x14010000, 0x148024e8, 0x14802600, 0x14810000)
Dynamic libraries:
0x00400000 - 0x0040b000 c:\dcsthick\jre\bin\java.exe
0x7c900000 - 0x7c9b0000 C:\WINDOWS\system32\ntdll.dll
0x7c800000 - 0x7c8f5000 C:\WINDOWS\system32\kernel32.dll
0x77dd0000 - 0x77e6b000 C:\WINDOWS\system32\ADVAPI32.dll
0x77e70000 - 0x77f01000 C:\WINDOWS\system32\RPCRT4.dll
0x77c10000 - 0x77c68000 C:\WINDOWS\system32\MSVCRT.dll
0x08000000 - 0x08143000 c:\dcsthick\jre\bin\client\jvm.dll
0x7e410000 - 0x7e4a1000 C:\WINDOWS\system32\USER32.dll
0x77f10000 - 0x77f57000 C:\WINDOWS\system32\GDI32.dll
0x76b40000 - 0x76b6d000 C:\WINDOWS\system32\WINMM.dll
0x76390000 - 0x763ad000 C:\WINDOWS\system32\IMM32.DLL
0x10000000 - 0x10007000 c:\dcsthick\jre\bin\hpi.dll
0x76bf0000 - 0x76bfb000 C:\WINDOWS\system32\PSAPI.DLL
0x00390000 - 0x0039e000 c:\dcsthick\jre\bin\verify.dll
0x003b0000 - 0x003c9000 c:\dcsthick\jre\bin\java.dll
0x003d0000 - 0x003de000 c:\dcsthick\jre\bin\zip.dll
0x02e70000 - 0x02f84000 C:\dcsthick\jre\bin\awt.dll
0x73000000 - 0x73026000 C:\WINDOWS\system32\WINSPOOL.DRV
0x774e0000 - 0x7761d000 C:\WINDOWS\system32\ole32.dll
0x5ad70000 - 0x5ada8000 C:\WINDOWS\SYSTEM32\uxtheme.dll
0x02fe0000 - 0x03031000 C:\dcsthick\jre\bin\fontmanager.dll
0x73760000 - 0x737a9000 C:\WINDOWS\system32\ddraw.dll
0x73bc0000 - 0x73bc6000 C:\WINDOWS\system32\DCIMAN32.dll
0x73940000 - 0x73a10000 C:\WINDOWS\system32\D3DIM700.DLL
0x74720000 - 0x7476b000 C:\WINDOWS\system32\MSCTF.dll
0x755c0000 - 0x755ee000 C:\WINDOWS\system32\msctfime.ime
0x03320000 - 0x0333c000 C:\dcsthick\lib\CrewsDmApiJniNt.dll
0x031b0000 - 0x031bb000 c:\dcsthick\lib\CRWNT_DM.dll
0x03240000 - 0x03249000 c:\dcsthick\lib\BAT_API.dll
0x03340000 - 0x03352000 c:\dcsthick\lib\DC_DSM32.dll
0x03360000 - 0x03369000 c:\dcsthick\lib\CRWTOOLS.dll
0x77c00000 - 0x77c08000 C:\WINDOWS\system32\VERSION.dll
0x03370000 - 0x0337a000 c:\dcsthick\lib\PMAPI.dll
0x5d090000 - 0x5d12a000 C:\WINDOWS\system32\COMCTL32.dll
0x03790000 - 0x037b2000 c:\dcsthick\ResaDLL\DC_DSMNB.dll
0x5b860000 - 0x5b8b4000 C:\WINDOWS\system32\NETAPI32.dll
0x038d0000 - 0x038f2000 c:\dcsthick\ResaDLL\DC_DSMIP.dll
0x71ad0000 - 0x71ad9000 C:\WINDOWS\system32\WSOCK32.dll
0x71ab0000 - 0x71ac7000 C:\WINDOWS\system32\WS2_32.dll
0x71aa0000 - 0x71aa8000 C:\WINDOWS\system32\WS2HELP.dll
0x71a50000 - 0x71a8f000 C:\WINDOWS\system32\mswsock.dll
0x662b0000 - 0x66308000 C:\WINDOWS\system32\hnetcfg.dll
0x71a90000 - 0x71a98000 C:\WINDOWS\System32\wshtcpip.dll
0x76f20000 - 0x76f47000 C:\WINDOWS\system32\DNSAPI.dll
0x76fb0000 - 0x76fb8000 C:\WINDOWS\System32\winrnr.dll
0x76f60000 - 0x76f8c000 C:\WINDOWS\system32\WLDAP32.dll
0x66580000 - 0x6658f000 C:\WINDOWS\system32\pnrpnsp.dll
0x76fc0000 - 0x76fc6000 C:\WINDOWS\system32\rasadhlp.dll
0x032e0000 - 0x0330a000 C:\dcsthick\lib\ResaHostConnection.dll
0x03250000 - 0x03257000 c:\dcsthick\lib\CRWNT_GWALC.dll
0x03310000 - 0x03319000 c:\dcsthick\lib\ALCAPI.dll
0x763b0000 - 0x763f9000 C:\WINDOWS\system32\comdlg32.dll
0x77f60000 - 0x77fd6000 C:\WINDOWS\system32\SHLWAPI.dll
0x7c9c0000 - 0x7d1d7000 C:\WINDOWS\system32\SHELL32.dll
0x773d0000 - 0x774d3000 C:\WINDOWS\WinSxS\x86_Microsoft.Windows.Common-Controls_6595b64144ccf1df_6.0.2600.2982_x-ww_ac3f9c03\comctl32.dll
VM Arguments:
jvm_args: -Dcfdynaproppath=c:\dcsthick/config/ -Dcfdynapropxml=RESA_KCOdynamicproperties.xml -DConfigPath=c:\dcsthick/config/RESA_KCOConfig.xml -DResolution=High -DWorkstationID=GWGTE -DMode=GateBoarding -DlogPath=c:\temp\kcologs -DlogInformation=0 -DGateway=ALCSQ1 -DNetBiosPort=A
java_command: com.singaporeair.dcs.standalone.application.model.ApplicationModel SQ/IGATEADXX
Launcher Type: SUN_STANDARD
Environment Variables:
JAVA_HOME=c:\dcsthick\jre\bin
PATH=c:\dcsthick\jre\bin;c:\dcsthick/lib;c:\dcsthick/ResaDLL
USERNAME=USER
OS=Windows_NT
PROCESSOR_IDENTIFIER=x86 Family 6 Model 15 Stepping 13, GenuineIntel
--------------- S Y S T E M ---------------
OS: Windows XP Build 2600 Service Pack 2
CPU:total 2 family 6, cmov, cx8, fxsr, mmx, sse, sse2
Memory: 4k page, physical 1039600k(565656k free), swap 2501208k(2091128k free)
vm_info: Java HotSpot(TM) Client VM (1.4.2_14-b05) for windows-x86, built on Mar 14 2007 16:46:11 by "java_re" with MS VC++ 6.0
The JAVA Application during initialisation establishes a connection with the host server for various devices. For each of the device it establishes a separate connection and keeps listening on these connections using multithreading.
During App close, we need to close each of these connections one by one for each device.
The opening /closing of connection is done by 3rd party DLL and call to there APIs is done through a C++ Wrapper DLL that I have built between the Java layer and their DLL.
When we close the Application, I am always able to close the connections on the first 2 devices. Then all of a sudden it crashes either for the 3rd device conn. close or for the 4th one. The code is the same for all the devices . That too sometimes it just goes fine without crashing. If its a null pointer exception, why is it that it crashes on some occassions and not in other times. More importantly, why is it that it does not fail for the first 2 devices , but fails for the 3rd or 4th device connection close?
Can please anyone help me. Please suggest me as to how I can determine the cause of the error.
And is this error really coming in ntdll.dll or is it getting caused of my dll?

The opening /closing of connection is done by 3rd party DLL and call to there APIs is done through a C++ Wrapper DLL that I have built between the Java layer and their DLL.The specific error indicates a pointer/memory problem.
The first place that is likely is in your code.
The second most likely place for the cause is because you are using the third party library incorrectly. For example before exiting you are supposed to clean up resources and you are not doing so.
As a remote possibility, much less likely that either of the above, there is a bug in jnative or in the 3rd party library.

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moorthy

What are the applications run on the Java Stack ?

Hi all,
Our SAP System is being upgraded to 6.o . Basis team is telling that they will not install a java stack as it need more time & extra resources. Just we want to know the list of applications OR Functionality which need java stack . And also in future if we want to go for new technologies which avaliable on SAP , Would this affect( missing java stack ) ? Advanced thanks for all your suggestions.
Thanks
Suds

Hi,
For what purpose you want Java stack ?
Thanks
Sunny

Preventing the Java stack crashing due to memory issues

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