Problems with jlaunch process - high CPU consumption

[Former Member]

I have created an OSS Message concerning this problem and SAP identified two problematic threads. I would appreciate any assistance you could provide. Thank you. Steve Baker

The only problematic threads are:

"SAPEngine_Application_Thread[impl:3]_12" (TID:0x700000010896A00,

sys_thread_t:0x1160EBCC0, state:MW, native ID:0x1C1E) prio=5

at org.apache.xml.utils.SuballocatedIntVector.setElementAt(SuballocatedIntVector.java(Compiled Code))

at org.apache.xml.dtm.ref.dom2dtm.DOM2DTM.addNode(DOM2DTM.java(Compiled

Code))

at org.apache.xml.dtm.ref.dom2dtm.DOM2DTM.nextNode(DOM2DTM.java(CompiledCode))

at org.apache.xml.dtm.ref.dom2dtm.DOM2DTM.getHandleFromNode(DOM2DTM.java(Compiled Code))

at org.apache.xml.dtm.ref.dom2dtm.DOM2DTM.getHandleOfNode(DOM2DTM.java(Compiled Code))

at org.apache.xml.dtm.ref.DTMManagerDefault.getDTMHandleFromNode(DTMManagerDefault.java(Compiled Code))

at org.apache.xpath.XPathContext.getDTMHandleFromNode(XPathContext.java(Compiled Code))

at org.apache.xpath.XPathAPI.eval(XPathAPI.java(Compiled Code))

at org.apache.xpath.XPathAPI.selectNodeIterator(XPathAPI.java(Compiled

Code))

at org.apache.xpath.XPathAPI.selectSingleNode(XPathAPI.java(Compiled

Code))

at org.apache.xpath.XPathAPI.selectSingleNode(XPathAPI.java(Compiled

Code))

at com.openHR.OpenHR.xmlSelectSingleNode(OpenHR.java(Compiled Code))

at jsp_TimeMPlanning1148393680219.sortNodeList(jsp_TimeMPlanning1148393680219.java(Compiled Code))

at jsp_TimeMPlanning1148393680219._jspService(jsp_TimeMPlanning1148393680219.java:260)

at com.sap.engine.services.servlets_jsp.server.servlet.JSPServlet.service(JSPServlet.java:541)

and

"SAPEngine_Application_Thread[impl:3]_9" (TID:0x700000010896C28,

sys_thread_t:0x1155918C0, state:MW, native ID:0x191B) prio=5

at org.apache.xml.utils.SuballocatedIntVector.setElementAt(SuballocatedIntVector.java(Compiled Code))

at org.apache.xml.dtm.ref.dom2dtm.DOM2DTM.addNode(DOM2DTM.java(Compiled

Code))

at org.apache.xml.dtm.ref.dom2dtm.DOM2DTM.nextNode(DOM2DTM.java(CompiledCode))

at org.apache.xml.dtm.ref.dom2dtm.DOM2DTM.getHandleFromNode(DOM2DTM.java(Compiled Code))

at org.apache.xml.dtm.ref.dom2dtm.DOM2DTM.getHandleOfNode(DOM2DTM.java(Compiled Code))

at org.apache.xml.dtm.ref.DTMManagerDefault.getDTMHandleFromNode(DTMManagerDefault.java(Compiled Code))

at org.apache.xpath.XPathContext.getDTMHandleFromNode(XPathContext.java(Compiled Code))

at org.apache.xpath.XPathAPI.eval(XPathAPI.java(Compiled Code))

at org.apache.xpath.XPathAPI.selectNodeIterator(XPathAPI.java(Compiled

Code))

at org.apache.xpath.XPathAPI.selectSingleNode(XPathAPI.java(Compiled

Code))

at org.apache.xpath.XPathAPI.selectSingleNode(XPathAPI.java(Compiled

Code))

at com.openHR.OpenHR.xmlSelectSingleNode(OpenHR.java(Compiled Code))

at jsp_TimeMPlanning1148393680219.sortNodeList(jsp_TimeMPlanning1148393680219.java(Compiled Code))

at jsp_TimeMPlanning1148393680219._jspService(jsp_TimeMPlanning1148393680219.java:260)

at com.sap.engine.services.servlets_jsp.server.servlet.JSPServlet.service(JSPServlet.java:541)

[former_member197561 · Accepted solution]

Dear Steve,

I have checked the implementation under

http://grepcode.com/file/repo1.maven.org/maven2/xalan/xalan/2.7.1/org/apache/xml/utils/SuballocatedI...

and it seems to me that neither the class , or the method is "synchronized".

Based on my previous experience you are facing there an endless loop due to corrupted pointers in the "setElementAt" method. Same issue happens in java.util.Hashmap and other similar unprotected  for concurrent "put/add" classes.

I would recomment to think how to protect the "setElementAt" that you do not fall into this issue or address to the provideer of the code for solution.

Best Regards,

Sylvia

[Former Member]

Hello Steve, I have a long term contract for a SAP Netweaver administrator to start immediately in Brussels. Would you be available and interrested?

Thanks for your feedback.

Alban

[kohlerm]

Hi Steve,

From your stack trace it seems to me that this is a problem in a custom jsp not developed by SAP :

at org.apache.xpath.XPathAPI.selectSingleNode(XPathAPI.java(Compiled

Code))

at com.openHR.OpenHR.xmlSelectSingleNode(OpenHR.java(Compiled Code))

It seems to do some heavy work on an xml document using the xpath api.

Regards,

Markus