Help with production jvm issues at customer site

Following is a brief overview of two production issues experienced by an Oracle customer. Customer is currently running 32 bit Java 1.5_20 on Solaris 64 bit OS.
1)     OOM heap issues – SR #3-2611053901 – Recently we have been seeing OOM errors due to heap space. What we have seen is that some of the instances are not able to free up any memory space even after full GC, which results into a series of full GC’s back to back and eventually leads to OOM. During this time when continuous full GC is going on, we have seen the TCP connections and active JDBC connections shoot up and also lots of stuck threads. This error occurs during peak hours.
This is the output just before OOM. Just to be clear, this line is printed as last line of Full GC which meant that OOM happened right after Full GC:
[PSYoungGen: 111616K->82323K(172544K)] [PSOldGen: 1865727K->1865727K(1865728K)] 1977343K->1948051K(2038272K) [PSPermGen: 209111K->209061K(210944K)] GC time is exceeding GCTimeLimit of 98%, 13.3644395 secs]
2)     OOM swap space- SR: #3-1724941721 – From time to time, we get Exception in thread "CompilerThread0" java.lang.OutOfMemoryError: requested 32756 bytes for ChunkPool::allocate. Out of swap space?’ error in our production. Mostly this error occurs during off hours or off-peak hours. When this happen, there is plenty of heap and perm memory available which indicates that this is a native memory error. We already put two workarounds suggested by Oracle i.e. -XX:CodeCacheMinimumFreeSpace=8m -XX:ReservedCodeCacheSize=128m but still running into this problem.
What we are looking for:
1)     Recommendations on tuning our config parameters -
These are some recommendations we discussed internally. Please validate these recommendations and provide us the recommended values. We would also welcome any new recommendation on updating other parameters if that will help with our issues.
•     Change Xmx to 2048m and MaxPermSize to 512m
•     Specify ratio of young generation to old generation (-XX:NewRatio), and possibly survivor spaces.
•     Use Concurrent old generation collector (-XX:+UseConcMarkSweepGC), with a compatible parallel young generation collector (-XX:+UseParNewGC)
Our current config settings are:
JAVA Memory arguments: -Did=chaserels-cm21 -Xms1024m -Xmx2048m -XX:MaxPermSize=1024m -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:CodeCacheMinimumFreeSpace=8m -XX:ReservedCodeCacheSize=128m -verbose:gc -Dcom.sun.management.jmxremote=true -Dcom.sun.management.jmxremote.port=1641 -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false -Djava.awt.headless=true -Dfile.encoding=ISO646-US
In a subset of servers, the settings are same as above but for MaxPermSIze, which is set to -XX:MaxPermSize=512m
2)     Diagnostic help in how to further narrow down to the problem and what tool to use to gather heap dumps
We have tried to take heap dump using jmap on our production servers when OOM occurs due to heap but most of the time, we run into an exception (attached - which is probably an unresolved jvm bug). While we researched some alternatives to jmap for taking heap dumps, most of these require changing the start-up scripts or installing the tool on production system which may have a performance overhead. What we want is a least intrusive tool which could provide us heap dumps/snapshots without much overhead and could be preferably used remotely. If there are other ways of collecting data than heap dump, we could also use them.
Let me know if you have any questions or need any data.
Thanks for your help.
Error from heap dump :
Exception in thread "main" sun.jvm.hotspot.debugger.UnalignedAddressException: Trying to read at address: 0xfec080a7 with alignment: 4
at sun.jvm.hotspot.debugger.DebuggerUtilities.checkAlignment(DebuggerUtilities.java:40)
at sun.jvm.hotspot.debugger.proc.ProcDebuggerLocal.readCInteger(ProcDebuggerLocal.java:309)
at sun.jvm.hotspot.debugger.DebuggerBase.readAddressValue(DebuggerBase.java:425)
at sun.jvm.hotspot.debugger.proc.ProcDebuggerLocal.readOopHandle(ProcDebuggerLocal.java:326)
at sun.jvm.hotspot.debugger.proc.ProcAddress.getOopHandleAt(ProcAddress.java:96)
at sun.jvm.hotspot.oops.Oop.getKlassForOopHandle(Oop.java:198)
at sun.jvm.hotspot.oops.ObjectHeap.newOop(ObjectHeap.java:346)
at sun.jvm.hotspot.runtime.JavaThread.getThreadObj(JavaThread.java:333)
at sun.jvm.hotspot.utilities.AbstractHeapGraphWriter.writeJavaThreads(AbstractHeapGraphWriter.java:113)
at sun.jvm.hotspot.utilities.AbstractHeapGraphWriter.write(AbstractHeapGraphWriter.java:98)
at sun.jvm.hotspot.utilities.HeapHprofBinWriter.write(HeapHprofBinWriter.java:399)
at sun.jvm.hotspot.tools.JMap.writeHeapHprofBin(JMap.java:133)
at sun.jvm.hotspot.tools.JMap.writeHeapHprofBin(JMap.java:143)
at sun.jvm.hotspot.tools.JMap.run(JMap.java:71)
at sun.jvm.hotspot.tools.Tool.start(Tool.java:204)
at sun.jvm.hotspot.tools.JMap.main(JMap.java:126)

1) OOM heap issues – SR #3-2611053901 – Recently we have been seeing OOM errors due to heap space. What we have seen is that some of the instances are not able to free up any memory space even after full GC, which results into a series of full GC’s back to back and eventually leads to OOM. Which would be exactly what would happen if there were many objects which were not eligible for collection.
Causes would be either a bug (something not releasing something it should) or because the server is overloaded.
If there were no code changes it could still be a bug that has now only become apparent due to changes in usage patterns.
If that is the case then such bugs can usually be made more apparent by reducing the maximum heap. Doing that will cause it to occur faster.

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> Can someone help with this CSS issue....
>
>
http://66.162.81.144/cms400min/default.aspx
>
> If you view the main page you will see that our
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> In the limited research and reading I've done in the
last few
> years I've never heard anyone say this about APdivs.
Your limited research has failed to uncover the essence of
proper technique
in creating web pages. Layers are NOT a general layout tool
and will cause
you much more grief than you ever imagined. Here's one big
reason -
http://www.great-web-sights.com/g_layer-overlap.asp
> divs/layers are an excellent tool in Dreamweaver
They are, but only for specialty applications.
> "Is this true or is this
> bregent's personal opinion?"
It is my personal opinion based on seeing hundreds (if not
thousands) of new
users throw themselves on their swords as a result of having
committed to
pages built with layers, on this very forum.
> Starting over from
> scratch isn't an option and the owner of the website
likes my work.
Starting over from scratch need not involve a redesign of the
graphics. But
on a site built from layers, it would certainly involve a
rethinking of the
layout method. Read this -
http://apptools.com/examples/pagelayout101.php
Murray --- ICQ 71997575
Adobe Community Expert
(If you *MUST* email me, don't LAUGH when you do so!)
==================
http://www.projectseven.com/go
- DW FAQs, Tutorials & Resources
http://www.dwfaq.com - DW FAQs,
Tutorials & Resources
==================
"Mark 8:36" <[email protected]> wrote in
message
news:[email protected]...
>
quote:
Originally posted by:
bregent
> >I'm in the process of building a website for a
friend who owns a retail
> >gift
> store.
> >The site has a total of 41 pages. The URL is
> >
http://www.southerncharmgifts.net
>
> It is unfortunate that you started working on a
production site without
> first
> having a grasp of the techniques and tools required. You
wouldn't start
> building cabinets until you had a basic knowledge and
experience with wood
> and
> woodworking tools, or you'd end up with a large pile of
sawdust. And
> unfortunately that's where you are heading with this
site. You've made the
> basic mistake of laying out the site using AP divs. AP
Divs should be used
> rarely if ever, and only for special purposed. They are
not a primary
> layout
> tool. Honestly, I would start over from scratch. But
first, spend the next
> few
> weeks or months learning proper layout techniques and
working through
> tutorials
> before actually starting on a production site. Good
luck.
>
> Ok, forgive me for doubting what you said here, but this
is the first I've
> heard of this. In the limited research and reading I've
done in the last
> few
> years I've never heard anyone say this about APdivs.
Because I think
> divs/layers are an excellent tool in Dreamweaver. And
with the exception
> of my
> background image problem, which probably can be fixed by
changing the
> perameters, the only problems with the website are the
menus. Everything
> else
> looks good on both IE and Firefox.
>
> So my question for the rest of the forum is: "Is this
true or is this
> bregent's personal opinion?" No offense meant bregent,
but equating a
> months+
> worth of extremely hard work to sawdust is rather
disturbing. I just want
> to
> make sure what you're saying is the general consensus
before I take this
> too
> seriously.
>
> Thanks for your input, though. I appreciate your
honesty. Starting over
> from
> scratch isn't an option and the owner of the website
likes my work. But
> I'll
> keep these things in mind for the future. Take care.
>
>

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select Name, MYFile, Description, CategoryID
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</CFQUERY>
<head>
</head>
<body>
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endRow="#endRow#"><cfoutput>
<img src="../img/cat/#MYFile#" width="50" height="50">
<a
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#Description#
</cfoutput></cfloop>

Page2 code:
<CFQUERY name="getProjects"
datasource="#APPLICATION.dataSource#">
SELECT Projects.ProjectID, Projects.Name, Projects.Body,
Projects.CategoryID,
Categories.CategoryID AS catID, Categories.Name AS cat_name
FROM Projects
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WHERE Projects.CategoryID = #categoryID#
ORDER BY ProjectID
</CFQUERY>
<cfif getProjects.recordCount is 0>
No projects in this category.
<cfabort>
</cfif>
<head>

<script language="Javascript">
function changeRecord(){
document.category.submit();
</script>
</head>
<body>

<cfoutput
query="getProjects">#cat_name#</cfoutput>
<form Name="category" method="post"
Action="portfolio-detail.cfm?CategoryID=true">
<select name="CategoryID" size="1"
onChange="category.submit();">
<option value=""> --Select a Category--
</option>
<CFOUTPUT query= "getProjects">
<option value="#CategoryID#">#cat_name#</option>
</CFOUTPUT>
</select>
</form>

<cfoutput query="GetProjects" startRow="#startRow#"
maxRows="#maxRows#">
#Name#
#Body#
</cfoutput>

<cfmodule
template="../CFdocs/PageNav.cfm"
totalItems="#numRows#"
numPerPage="#maxRows#"
startRow="#startRow#"
url="#cgi.script_name#?categoryID=#categoryID#&startRow=#startRow#">
The main part that is not working properly is the select, and
category name. How to I get those to work independantly from my
where clause? (I need the where clause for the numbered nav and
cycling through the projects tied to the category you called up
from page 1.
Can someone help me tweek my code from this point? I am
stumped, I looked at the cf docs and I can't find a solution. I am
using CF 8.
Any help would be appreciated. Thank you!
CFmonger

I fixed a lot of this since I posted it this morning. Now all
that isn't working properly is the select, it isn't passing the
proper variable to make the query work.
This is what I have now:
Page 2:
<CFQUERY name="getProjects"
datasource="#APPLICATION.dataSource#">
SELECT Projects.ProjectID, Projects.Name, Projects.Body,
Projects.CategoryID,
Categories.CategoryID AS catID, Categories.Name AS cat_name
FROM Projects
INNER JOIN Categories
ON Categories.CategoryID = Projects.CategoryID
WHERE Projects.CategoryID = #categoryID#
ORDER BY ProjectID
</CFQUERY>

<cfif getProjects.recordCount is 0>
No projects in this category.
<cfabort>
</cfif>

<CFQUERY name="cata"
datasource="#APPLICATION.dataSource#">
select Name, MYFile, Description, CategoryID
FROM Categories
</CFQUERY>
<head>
<script language="Javascript">
function changeRecord(){
document.category.submit();
</script>
</head>
<body>

<cfoutput query="getProjects"
maxrows="1">#cat_name#</cfoutput>

<form Name="category" method="post"
Action="portfolio-detail.cfm?CategoryID=#CategoryID#">
<select name="CategoryID" size="1"
onChange="category.submit();">
<option value=""> --Select a Category--
</option>
<CFOUTPUT query= "cata">
<option value="#CategoryID#">#Name#</option>
</CFOUTPUT>
</select>
</form>

The error I get when using the select is this:
Error Executing Database Query.
[Macromedia][SequeLink JDBC Driver][ODBC
Socket][Microsoft][ODBC Microsoft Access Driver] Syntax error
(missing operator) in query expression 'Projects.CategoryID ='.
The error occurred in C:\Websites\folio\portfolio-detail.cfm:
line 12
10 : INNER JOIN Categories
11 : ON Categories.CategoryID = Projects.CategoryID
12 : WHERE Projects.CategoryID = #categoryID#
13 : ORDER BY ProjectID
14 : </CFQUERY>
I also tried doing it this way:
<form Name="category" method="post"
Action="portfolio-detail.cfm?CategoryID=true"
This way didn't work at all, it only made the numbered nav on
the page cycle through all the projects in all the categories.
What do I need to change to pass the proper variable from the
select nav to the innerjoin query and my where statement?

Can you pls help with theis OIM issue

1. How can I assign as APPROVER dynamically without using the OIM defaul approval process. Is there any way to use custom process?
Any Code/Help will be hioghly appreciated.

There are two ways you can do this (actually three if you want to use process determination rules and route the object to a completely different approval process - those are developed in the role designer and placed in the "process determination rules" tab on the Resource Object).
The easiest way to do it is to build a couple of task assignment rules (also in the rule designer). Assuming you want to use some value in the object form to determine which approver is assigned, you just make sure you build the rule with the type = Task Assignment, subtype = user provisioning and the object and process fields filled in (process should be the approval process). Then you will be able to build a role using the object form data.
example: Object form field A == "value A".
Build as many of these as you need and place them in the task assignment tab of the approval task, selecting the proper approver for each rule.
Note that you can also write the rule to route based on user data, only be aware that some versions of oim (actually all that I have tried, but it may be fixed in 9.1, not sure) will not process this correctly if there is a request submitted for multiple users. Rather than route each correctly it will assign all of them to approver determined for the last user submitted (this also holds true if you are assigning to user's manager). Oracle added an option in 9.0.3.1.6 to restrict requests to one user to get around this issue.
The other alternative is to write a task assignment adapter in the adapter factory. I've done this in cases where I need to lookup the approver in an external data source. Write the adapter to take in any user or object form data it needs to make the assignment. These adapters return two parameters (which do not need to be mapped in the task assignment tab where you map the input parameters). One return value is a string containing the Target Type ("User", "Group", etc) and the other containing either the user key or group key the approval is being routed to.
Note that for some reason you cannot just set the target type string in the adapter with a "Set Variable" adapter task, you actually have to call java code that returns the string you want to set this to.

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