Portal stability - "what is the portal doing?"

We have a portal running with the latest JDK (Linux X86_64, IBM JDK SR9), recommended parameters set and still facing lots of stability problems. The portal has three server processes, what we see actually is, that two of them consume each 100 % CPU. Actually no one is logged into the portal. I can see "strange" messages in the default trace such as
predecessor system -
com.sap.engine.services.applocking.exception.AppLockingTechnicalLockException: The lifetime can not be th
e user-session, because currently no user is logged in. Creating locks for the system-user is not allowed
        at com.sap.engine.services.applocking.AbstractBaseLocking.getObjectForLifetime(AbstractBaseLockin
g.java:483)
        at com.sap.engine.services.applocking.LogicalLockingImpl.getCurrentLifetimeDescription(LogicalLoc
kingImpl.java:193)
        at com.sap.engine.services.applocking.AbstractBaseLocking.lockInternal(AbstractBaseLocking.java:1
28)
        at com.sap.engine.services.applocking.LogicalLockingImpl.lock(LogicalLockingImpl.java:43)
        at com.sap.engine.services.applocking.NamespaceLogicalLockingImpl.lock(NamespaceLogicalLockingImp
l.java:47)
        at com.sap.engine.services.applocking.LogicalLocking_Stub.lock(LogicalLocking_Stub.java:65)
        at com.sapportals.wcm.service.taskqueue.TaskQueue$Lock.lock(TaskQueue.java:316)
        at com.sapportals.wcm.service.taskqueue.TaskQueue$Lock.writeLock(TaskQueue.java:293)
        at com.sapportals.wcm.service.taskqueue.TaskQueue.writeLock(TaskQueue.java:467)
        at com.sapportals.wcm.service.taskqueue.TaskQueue.get(TaskQueue.java:122)
        at com.sapportals.wcm.service.taskqueue.TaskQueueReader.get(TaskQueueReader.java:68)
        at com.sapportals.wcm.service.taskqueue.TaskQueueReader.get(TaskQueueReader.java:58)
        at com.sapportals.wcm.service.jobprocessor.LocalDispatcher.stopJobs(LocalDispatcher.java:161)
        at com.sapportals.wcm.service.jobprocessor.LocalDispatcher.run(LocalDispatcher.java:101)
        at java.lang.Thread.run(Thread.java:838)
the two server processes are "looping" somewhere, the filesystem gets trashed with those logfiles, 4 or 5 of default.trc.X each minute.
Restarting the portal is NOT an option since that problem will arise sooner or later again.
What can we as a CUSTOMER do aside from creating thread dumps and attach them to an OSS call and "wait"? How to find out, what the system is doing?
Markus

David, I really do appreciate your help - thank your for your time.
It´s 4 am here in Germany and I just got a reply from another J2EE-ESS-Portal Prio-1 call, that´s why I´m awake...
Meanwhile I have found out a possible "reason" for this. A collegue responsible for the "BI Portal" (we have meanwhile about 18 or 19 J2EE instances due to the fact, that you can´t install everything on one due to interdependencies - all-in-all a big mess) did today some configuration in federated portal infrastructure (I wasn´t aware of that) and apparently a configuration change invalidates the/a/some (of those dozend) buffers/caches on both portals and implictly triggers a GC. Since the parameter "-Xdisableexplicitgc" was not set, it may be ran around in circles.
I finally deleted the the logfiles today due to other problems we had because SAP is still unable to provide a usefull logging mechanism by default and your logfiles are getting trashed with 99,9 % garbage making finding other non-fatal errors almost impossible without stopping the engine, deleting all *.trc and *.log, starting again and trying to reproduce the error - on the production system, including massive user interruption (who´s logged on? one doesn´t know).
I am really thankful for your offer to help but I´m at the point, where I just open OSS calls, (including ABAP) 16 are running, 2 prio-1, several prio-2 - just plain frustration and no more motivation to do one step more than necessary.
I got today a note from a supporter about "JMS" - what the heck is that and why do I need to know anything about that? I´m at the point: "Either educate me and give me the possibility to do so without the necessity of becoming a Java developer - or leave me alone with that boring detail and fix the error."
You are absolutely correct, one need to work "together" but doing so by opening OSS calls and talking to seven different people in one call and giving me notes that are greek or other notes with "click here and click there" is not "working together", it´s just a very typical example of distributed development, where distributed is so distributed, that the right hand doesn´t know what the left hand does - limitation of damage.
Build once - debug everywhere.
sigh
Markus

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