Memory leak within FOProcessor class

Hi all,
I'm trying to use the XML Publisher API (5.6.2 and 5.6.3) to generate PDF documents from XSL templates and XML data in a J2EE environment (Jboss 4.0.5) with Struts but a memory leak occurs.
It seems not to be a multithreading issue because the leak is there even if the PDF documents are generated one by one.
I made many tests to isolate the leak and I have simplified my code as much as possible: it seems to happen within the FOProcessor class.
One of the tests generates 4,500 PDF documents (one at a time) from an XML file (3 KB) and an XSL file (74 KB with blanks). Nothing else is done with the Jboss server during this test. The XSL file was created before the test from a RTF file with XML Publisher. The memory leak is around 70 KB for each PDF document (around 300 MB for the whole test).
As you can see below from the heap histogram (taken at end of test after a full garbage collection) it seems that the XSL and XML elements/attributes are not released (and thus never garbage collected).
Did I miss something or is there an actual problem with the XML/XSL parsing within the XML Publisher API?
Thanks for your help.

Object Histogram:
Size    Count     Class description
131376968 2353450 java.lang.Object[]
60389464 937300 char[]
48260304 335141 oracle.xml.parser.v2.XSLResultElement
35690000 2230625 oracle.xml.util.FastVector
24127104 1005296 java.lang.String
16539120 413478 oracle.xml.parser.v2.XSLNode$AttrValueTmpl
14757064 128058 int[]
13348768 417149 java.lang.ref.Finalizer
12701776 102220 * ConstMethodKlass
12544808 23433   byte[]
12204080 108965 oracle.xml.parser.v2.XSLText
8344600 86584   java.util.Hashtable$Entry[]
7363768 102220 * MethodKlass
5592784 138700 * SymbolKlass
5362256 335141 oracle.xml.parser.v2.XSLAttributeSet[]
5267336 8135    * ConstantPoolKlass
5234016 163563 java.util.TreeMap$Entry
5121744 213406 java.util.Hashtable$Entry
4900480 61256   oracle.xml.parser.v2.XPathStep
4087120 51089   java.lang.reflect.Method
3823216 40276   java.util.HashMap$Entry[]
3524696 8135    * InstanceKlassKlass
3378000 84450   java.util.Hashtable
3064872 127703 java.util.HashMap$Entry
2971904 6880    * ConstantPoolCacheKlass
2968560 26505   oracle.xml.parser.v2.XSLValueOf
2770656 24738   oracle.xml.parser.v2.XSLVariable
2167520 27094   oracle.xml.parser.v2.XPathFunctionCall
1880088 33573   oracle.xml.parser.v2.PathExpr
1726360 61482   java.lang.String[]
1573720 39343   java.util.HashMap
1476576 30762   oracle.xml.parser.v2.XSLExprValue
1460840 36521   java.util.TreeMap
1319360 23560   oracle.xml.parser.v2.XPathConstantExpr
1054976 16484   org.jboss.mx.server.InvocationContext
1001264 3546    * MethodDataKlass
887424 11049   short[]
835680 8705    java.lang.Class
830208 25944   oracle.xml.util.NSNameImpl
705816 29409   java.util.ArrayList
684152 4501    org.jboss.web.tomcat.tc5.session.SessionBasedClusteredSession
670288 14071   java.lang.Object[]
640832 10013   oracle.xml.parser.v2.XPathVarReference
561056 35066   javax.management.modelmbean.DescriptorSupport
556272 23178   EDU.oswego.cs.dl.util.concurrent.ConcurrentReaderHashMap$Entry
552984 30451   java.lang.Class[]
494760 2945    oracle.xml.parser.v2.XSLTemplate
480792 20033   antlr.ANTLRHashString
442576 27661   java.lang.Integer
432096 4501    org.jboss.web.tomcat.statistics.ReplicationStatistics$TimeStatistic
429040 10726   org.hibernate.hql.ast.tree.Node
369880 9247    javax.management.modelmbean.ModelMBeanOperationInfo
312384 19524   java.util.TreeMap$3
305368 5453    java.net.URL
287392 8981    org.jboss.mx.interceptor.ReflectedDispatcher
259264 338     EDU.oswego.cs.dl.util.concurrent.ConcurrentReaderHashMap$Entry[]
252280 4505    org.jboss.cache.lock.ReadWriteLockWithUpgrade
238600 5965    org.jboss.mx.interceptor.PersistenceInterceptor
238600 5965    org.jboss.mx.interceptor.AttributeDispatcher
236616 9859    org.jboss.mx.server.AbstractMBeanInvoker$OperationKey
219776 3434    java.lang.reflect.Constructor
206880 6465    javax.management.modelmbean.ModelMBeanAttributeInfo
193168 2259    java.lang.reflect.Method[]
173184 5412    java.lang.ref.SoftReference
164920 589     oracle.xml.parser.v2.XSLStylesheet
164464 541     * ObjArrayKlassKlass
152832 6368    org.dom4j.tree.DefaultAttribute
149472 2076    java.lang.reflect.Field
144160 4505    org.jboss.cache.Node
143160 5965    org.jboss.mx.interceptor.ModelMBeanAttributeInterceptor
140600 3515    org.apache.xerces.dom.DeferredTextImpl
140224 2740    javax.management.modelmbean.ModelMBeanAttributeInfo[]
139056 7658    boolean[]
134664 3359    java.lang.String[][]
131936 1178    oracle.xml.parser.v2.XSLCondition
131936 1178    oracle.xml.parser.v2.XSLForEach
129072 2668    javax.management.modelmbean.ModelMBeanOperationInfo[]
128952 5373    EDU.oswego.cs.dl.util.concurrent.ConcurrentHashMap$Entry
124776 1733    org.hibernate.hql.ast.tree.IdentNode
115200 1800    javax.management.modelmbean.ModelMBeanInfoSupport
113088 2356    oracle.xml.parser.v2.AdditiveExpr
109416 4559    java.beans.PropertyChangeSupport
108960 1135    java.io.ObjectStreamClass
108120 4505    org.jboss.cache.lock.IdentityLock
105864 345     long[]
98752   3086    java.io.ObjectStreamClass$WeakClassKey
97968   4082    java.util.Vector
96672   2014    java.util.Properties
94240   589     oracle.xml.parser.v2.XSLOutput
90072   3753    javax.management.ObjectName$Property
87432   3643    javax.management.MBeanParameterInfo
82368   858     org.hibernate.hql.ast.tree.DotNode
81248   5078    java.lang.Long
78656   1229    org.hibernate.mapping.Column
77664   4854    java.util.Collections$SynchronizedSet
77448   3227    java.util.LinkedList$Entry
73824   769     org.jboss.mx.modelmbean.XMBean
73536   4596    java.util.Hashtable$KeySet
72144   4509    EDU.oswego.cs.dl.util.concurrent.CopyOnWriteArraySet
72144   4509    EDU.oswego.cs.dl.util.concurrent.CopyOnWriteArrayList
72144   4509    org.jboss.cache.Fqn
72080   4505    org.jboss.cache.lock.ReadWriteLockWithUpgrade$WriterLock
72080   4505    org.jboss.cache.lock.LockStrategyRepeatableRead
72080   4505    org.jboss.cache.lock.ReadWriteLockWithUpgrade$ReaderLock
72080   4505    org.jboss.cache.lock.LockMap
72016   4501    org.apache.catalina.session.StandardSessionFacade
71776   4486    java.io.FileDescriptor
70680   589     oracle.xml.parser.v2.XSLCallTemplate
70680   589     oracle.xml.parser.v2.XSLApplyTemplates
70224   154     org.hibernate.persister.entity.SingleTableEntityPersister
68296   2774    javax.management.ObjectName$Property[]
68160   1065    org.apache.xerces.dom.DeferredElementNSImpl
67760   770     org.hibernate.loader.entity.EntityLoader
66992   19      EDU.oswego.cs.dl.util.concurrent.ConcurrentHashMap$Entry[]
65968   1178    oracle.xml.parser.v2.XPathFilterExpr
65968   589     oracle.xml.parser.v2.XMLUTF8Reader
64432   4027    java.util.HashSet
63648   1326    oracle.xml.parser.v2.XMLNode[]
63440   1586    org.hibernate.loader.DefaultEntityAliases
61256   589     oracle.xml.parser.v2.XSLNode
61256   589     oracle.xml.parser.v2.XMLReader
60816   2534    org.apache.xerces.xni.QName
57360   478     org.hibernate.hql.ast.tree.FromElement
56976   1187    org.hibernate.mapping.Property
56544   1178    oracle.xml.parser.v2.XSLNodeSetExpr
56544   1178    oracle.xml.parser.v2.MultiplicativeExpr
56544   1178    oracle.xml.parser.v2.EqualExpr
54384   618     oracle.xml.parser.v2.XMLError
49392   2783    javax.management.MBeanParameterInfo[]
47648   1489    java.util.LinkedHashMap$Entry
47120   589     oracle.xml.parser.v2.XMLByteReader[]
...

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Decompile it using jad. Find leak.Yes, I too got the idea and tried to decompile those classes and recompile. I had some problems while recompiling. Is this is the only way to get rid of this problem?
I was refering to powersoft.datawindow.DataStore class. Does any body here has worked on these?
Can you suggest me how to find the memory leak causes? if you were needed to find out memory leak causes, what would be your approach?
Madhav

HTTPService + XML Load + Memory Leak

Hi all....
I have noticed a memory leak in my application. This leak was
not apparent when the application was completed some months back
which is what left me a little confused as all I have done since
was upgrade to Flex 3 and possibly updated / changed my Flash
player.
I think I have found the cause to this problem (below) but am
not 100% sure that it is the "actual" problem or any reasons to
back my thoughts up, so have listed what I have checked / tried
along the way (maybe I have missed something)....
My Discovery Process:
I started profiling my application but did not find anything
out of the ordinary. I did a code walk-through double checking I
had cleaned up after myself, removing and even nulling all items
etc but still to now success - the leak is still there.
I have profiled the app in the profiler for reasonably long
periods of time.
All the classes etc being used within the app are consistent
in size and instance amount and there is no sign of any apparent
leak.
I am using a HTTPService that is loading XML data which I am
refreshing every 5 seconds. On this 5 second data refresh some
class instances are incremented but are restored to the expected
amount after a GC has occurred. The GC seems to take longer, the
longer the app is running, therefore more and more instances are
being added to the app, but when the GC eventually runs it "seems"
to clear these instances to the expected amount.
After scratching my head for a while I decided to make a copy
of my application, rip everything out, and focus in my data load,
where I found a problem!
I have now just a HTTPService that loads an XML file every 5
seconds, and this is all I currently have in the app (as I ripped
the rest of the code out), e.g:
Code:
<mx:Application xmlns:mx="
http://www.adobe.com/2006/mxml"
....... creationComplete="initApp()" >
<mx:HTTPService
id="httpServiceResults"
url="
http://myIP:myPort/myRoot/myXML.cfm"
resultFormat="e4x"
result="httpResultHandler(event)" />
<script....... >
private var timerPulse:Timer;
private function initApp():void
httpServiceResults.send();
timerPulse = new Timer(5000, 0);
private function httpResultHandler(event:ResultEvent):void
timerPulse.start();
timerPulse.addEventListener(TimerEvent.TIMER, timerRefresh);
public function timerRefresh(eventObj:TimerEvent):void
timerPulse.stop();
timerPulse.removeEventListener(TimerEvent.TIMER,
timerRefresh);
timerPulse.reset();
httpServiceResults.send();
</script>
</mx:Application>
This is pretty much the code I am currently using and it
leaks.
I ran and monitored this in both the profiler and the
activity / task manager, and after running the app for 1800 seconds
(30 min) in the profiler, the memory size grew from 50mg to 165mg
just sending the HTTPService.
I tried loading the service in multiple ways including in AS
rather than MXML creating new instances of it each time, resetting
it, nulling it etc... but nothing prevented this memory increase.
I then tried to load the XML using different methods such as
using the URLRequest and URLLoader which again caused a memory
leak.
What still confuses me is that this leak did not exist in the
previous version and not a great deal has changed since then apart
from upgrading to Flex 3 and possibly upgrading my Flash payer
(which I believe is a possible cause)
After looking into this issue a bit more deeply, I read a few
blogs / forums and other people are experiencing the same problems
- even with a lot bigger leaks in some cases all when reloading
large sets of XML data into Flex - however, I as of yet found no
solution to this leak - people with a similar problem believe it is
not due to a memory leak more a GC error, and others pointing
towards the Flash Player itself that is leaking - I don't really
know.
Findings so far during investigation of this issue:
* App leaks for both HTTPService and ULRRequest / URLLoader
methods
* App only leaks when calling a data loader
* The size of the leak seems to depend on the size of the
XML being loaded
* The size of the leak also seems to be affected by the
applications heaviness - the greater seems to enhance the leak
An interesting factor I have noticed is that if I copy the
XML from my "myXML.cfm" that I link to in my HTTPService and copy
the contents of the file into my own XML file stored within the
Flex project root itself: ""myXML.xml"" the leak disappears... like
it seems to link when loading the XML over a network, however as my
network knowledge is not great I am not sure what to make of this -
any ideas???
Could the connection to the XML document cause leaks??? is
there anything else that could cause this leak??? have I something
in my code sample that could cause this leak??? or could any of the
other things I have mentioed cause this leak???
Any help / ideas would be greatly appreciated.
Thanks,
Jon.

I also observed heavy memory leak from using httpservice with
XML data. I am using Flex3 builder under Linux. My Flex application
polls httpservice every 10 seconds. The reply is a short XML
message less than 100 bytes. This simple polling will consume 30+
MB of memory every hour. I leave it idling for several hours and it
took 200 MB of memory. No sign of garbage collection at all.

Memory leak on SunOne Web Server 6.1 on application reload

Hi!
I am pretty sure that i have found a memory management problem in
SunOne Web Server 6.1 .
It started with an OutOfMemory error we got under heavy load . After
some profiling with Jprofiler i didn't find any memory leaks in the
application.Even under heavy load (generated by myself) i can't find
anything ,more, i can't reproduce the error! The memory usage is
about 20Mb and does not go up .
However it is pretty simple to see the following behavior:
[1] Restart the server (to have a clear picture) and wait a little for
memory usage to stabilize.
[2] In the application dir. touch .reload or one of the classes:
The memory usage goes up by another 50Mb (huge amount of mem. taking
into account the fact that it used only 20Mb under any load befor).
Do this another time and another 20Mb gone etc..
The JProfiler marks the memory used by classes . And it can be
clearly seen the GC can't release most of it.
I AM sure this is not the application that takes all the memory.
Another hint : after making the server to reload application i can see
that the number of threads ON EVERY RELOAD is going up by ~10-20
threads .The # of threads goes lower over time but not the mem usage.
My system:
Sparc Solaris 9 ,Java 1.4.2_04-b05, Sun ONE Web Server 6.1SP5
Evgeny

my guess is that - because of '.reload' , web container tries to
recompile all the classes that you use within your web application and
hence the memory growth is spiking up.What do you mean by "tries to recompile"?The classes in
Web-inf are already compiled! And i have only ~5 jsp's .
(the most part of the applic. is a complicated business logic)
If you are talking about reloading them ,yes,that's the purpose of .reload,
isn't it? :).But it seems that container uses the memory for it's own
classes: the usage of memory for my classes don't really grow
that much (if at all) after reload (according to profiler)
Also the real problem is that the memory usage grows to much for
too long (neither seen it going down) and thus ends with OutOfMemory.
if you are seeing the memory growth to be flat in stress environment,
then I am not sure that why do you think that there is a memory leak ?There is no memory leak in stress environment.
There is memory leak while reloading the application.
It is a memory hog for sure (~20-30Mb for every reload).
Memory leak?It seems that way because i can't see memory usage go
down and after a lot of reloads OutOfMemory is thrown.
also, what is jvm heap that you use ? did you try jvm tune options like -
XX:+AggressiveHeap ?256Mb.I can set it bigger ,but how do i know that it will not just delay
the problem ?
Thanks for response.
Evgeny

Memory leak within FOProcessor class

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