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From "Daniel Kulp (JIRA)" <j...@apache.org>
Subject [jira] Updated: (CXF-2689) Classloader not GC'ed after undeploying the applications. Reference from SingleElementLeafProperty
Date Tue, 09 Mar 2010 01:25:27 GMT

     [ https://issues.apache.org/jira/browse/CXF-2689?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Daniel Kulp updated CXF-2689:
-----------------------------

    CXF Fields: [Blocked on External]


This is a bug in JAXB.   I've logged an issue with them:


https://jaxb.dev.java.net/issues/show_bug.cgi?id=742

> Classloader not GC'ed after undeploying the applications. Reference from SingleElementLeafProperty
> --------------------------------------------------------------------------------------------------
>
>                 Key: CXF-2689
>                 URL: https://issues.apache.org/jira/browse/CXF-2689
>             Project: CXF
>          Issue Type: Bug
>          Components: JAX-WS Runtime
>    Affects Versions: 2.2.6
>         Environment: Windows XP / Solaris 10
> JBoss 5.1.0.GA
>            Reporter: Danny Blazejczak
>
> I found that after undeploying my applications from JBoss 5.1.0.GA the classloaders remain
hanging and are never garbage collected. These are the items I have tried so far:
> - JVM options : -XX:+UseConcMarkSweepGC -XX:+CMSPermGenSweepingEnabled -XX:+CMSClassUnloadingEnabled
 
>   These make that the permgen gets collected periodically.
> - I have verified that after several redeployments there is indeed the PermGen OOM error.
> The applications consist of a war package, containing the JSP frontend. and an EAR containing
all the backend services (it includes CXF 2.2.6 and JAXB 2.1.12 within the EAR). I use CXF
as a jaxws:client:
> Analyzing a memory dump several minutes after undeployment, and after manually triggering
GC, I extracted this with Eclipse MAT. 
> It contains the "Path to GC (Excluding all weak, soft and phantom references)":
> Class Name                                                                          
                   | Shallow Heap | Retained Heap 
> ---------------------------------------------------------------------------------------------------------------------------------------
> org.jboss.classloader.spi.base.BaseClassLoader @ 0xdf9e538                          
                   |           96 |    10,484,208 
> '- <classloader> class com.sun.xml.bind.v2.runtime.property.SingleElementLeafProperty
@ 0x2711fde0      |            8 |             8 
>    |- <class> com.sun.xml.bind.v2.runtime.property.SingleElementLeafProperty @
0xeeb0140                |           40 |         1,336 
>    |  |- value java.lang.ThreadLocal$ThreadLocalMap$Entry @ 0x10173b88              
                   |           32 |            32 
>    |  |  '- [39] java.lang.ThreadLocal$ThreadLocalMap$Entry[128] @ 0xf7ca2f8        
                   |          528 |        23,240 
>    |  |     '- table java.lang.ThreadLocal$ThreadLocalMap @ 0xf6647a8               
                   |           24 |        23,264 
>    |  |        '- threadLocals java.lang.Thread @ 0xf4856c0  http-127.0.0.1-8080-14 Native
Stack, Thread|          104 |        23,928 
>    |  |- value java.lang.ThreadLocal$ThreadLocalMap$Entry @ 0x101d8f98              
                   |           32 |            32 
>    |  |- value java.lang.ThreadLocal$ThreadLocalMap$Entry @ 0x101d9240              
                   |           32 |            32 
>    |  |- value java.lang.ThreadLocal$ThreadLocalMap$Entry @ 0x101e8df0              
                   |           32 |            32 
>    |  |- value java.lang.ThreadLocal$ThreadLocalMap$Entry @ 0x103c01f8              
                   |           32 |            32 
>    |  |- value java.lang.ThreadLocal$ThreadLocalMap$Entry @ 0x104c1b20              
                   |           32 |            32 
>    |  |- value java.lang.ThreadLocal$ThreadLocalMap$Entry @ 0x10567780              
                   |           32 |            32 
>    |  '- Total: 7 entries                                                           
                   |              |               
>    |- <class> com.sun.xml.bind.v2.runtime.property.SingleElementLeafProperty @
0xed70788                |           40 |         1,280 
>    |  |- value java.lang.ThreadLocal$ThreadLocalMap$Entry @ 0xf8dcc78               
                   |           32 |            32 
>    |  |  '- [9] java.lang.ThreadLocal$ThreadLocalMap$Entry[128] @ 0xf7bca90         
                   |          528 |        22,520 
>    |  |     '- table java.lang.ThreadLocal$ThreadLocalMap @ 0xf515ca8               
                   |           24 |        22,544 
>    |  |        '- threadLocals java.lang.Thread @ 0xf35e078  http-127.0.0.1-8080-8 Native
Stack, Thread |          104 |        23,208 
>    |  |- value java.lang.ThreadLocal$ThreadLocalMap$Entry @ 0xf8dcd18               
                   |           32 |            32 
>    |  |- value java.lang.ThreadLocal$ThreadLocalMap$Entry @ 0xf8e7628               
                   |           32 |            32 
>    |  |- value java.lang.ThreadLocal$ThreadLocalMap$Entry @ 0xfd624d0               
                   |           32 |            32 
>    |  |- value java.lang.ThreadLocal$ThreadLocalMap$Entry @ 0xfd6d480               
                   |           32 |            32 
>    |  |- value java.lang.ThreadLocal$ThreadLocalMap$Entry @ 0xfd77710               
                   |           32 |            32 
>    |  |- value java.lang.ThreadLocal$ThreadLocalMap$Entry @ 0xfd96740               
                   |           32 |            32 
>    |  |- value java.lang.ThreadLocal$ThreadLocalMap$Entry @ 0xfd9d5c0               
                   |           32 |            32 
>    |  |- value java.lang.ThreadLocal$ThreadLocalMap$Entry @ 0xff51780               
                   |           32 |            32 
>    |  |- value java.lang.ThreadLocal$ThreadLocalMap$Entry @ 0x10145a28              
                   |           32 |            32 
>    |  |- value java.lang.ThreadLocal$ThreadLocalMap$Entry @ 0x106537c8              
                   |           32 |            32 
>    |  '- Total: 11 entries                                                          
                   |              |               
>    '- Total: 2 entries                                                              
                   |              |               
> ---------------------------------------------------------------------------------------------------------------------------------------
> It shows the SingleElementLeafProperty from JAXBImpl holding references to the classloader
(of the EAR packaged application). the instance SingleElementLeafProperty  contains a fieldName
which holds one of the parameter names of the invoked operation.
> When I open a JPDA debug session to JBoss and suspend the Threads, I found indeed they
included hard references to the SingleElementLeafProperty. This is a dump of the variables
in the suspended Thread threadLocals:
> [25]	ThreadLocal$ThreadLocalMap$Entry  (id=229)	
> 	discovered	null	
> 	next	ThreadLocal$ThreadLocalMap$Entry  (id=229)	
> 	queue	ReferenceQueue$Null  (id=215)	
> 	referent	null	
> 	value	SingleElementLeafProperty<BeanT>  (id=239)	
> 		acc	AdaptedAccessor<BeanT,InMemValueT,OnWireValueT>  (id=240)	
> 		defaultValue	null	
> 		fieldName	"msisdn" (id=244)	
> 		nillable	false	
> 		propertyInfo	null	
> 		tagName	Name  (id=245)	
> 		xacc	TransducedAccessor$CompositeTransducedAccessorImpl<BeanT,ValueT>  (id=247)

> 			acc	AdaptedAccessor<BeanT,InMemValueT,OnWireValueT>  (id=240)	
> 				adapter	Class<T> (javax.xml.bind.annotation.adapters.NormalizedStringAdapter)
(id=253)	
> 					annotations	null	
> 					annotationType	null	
> 					cachedConstructor	null	
> 					classRedefinedCount	0	
> 					declaredAnnotations	null	
> 					declaredConstructors	SoftReference<T>  (id=349)	
> 					declaredFields	null	
> 					declaredMethods	null	
> 					declaredPublicFields	null	
> 					declaredPublicMethods	null	
> 					enumConstantDirectory	null	
> 					enumConstants	null	
> 					genericInfo	ClassRepository  (id=279)	
> 					lastRedefinedCount	0	
> 					name	"javax.xml.bind.annotation.adapters.NormalizedStringAdapter" (id=283)	
> 					newInstanceCallerCache	null	
> 					publicConstructors	null	
> 					publicFields	null	
> 					publicMethods	null	
> 				core	Accessor$FieldReflection<BeanT,ValueT>  (id=254)	
> 					f	Field  (id=294)	
> 						annotations	byte[20]  (id=298)	
> 						clazz	Class<T> (com.al.apc.generated.services.customeraccount.BaseAccountRequest)
(id=300)	
> 						declaredAnnotations	LinkedHashMap<K,V>  (id=301)	
> 						fieldAccessor	null	
> 						genericInfo	null	
> 						modifiers	4	
> 						name	"msisdn" (id=244)	
> 						override	true	
> 						overrideFieldAccessor	UnsafeObjectFieldAccessorImpl  (id=303)	
> 						root	Field  (id=305)	
> 						securityCheckCache	null	
> 						securityCheckTargetClassCache	null	
> 						signature	null	
> 						slot	7	
> 						type	Class<T> (java.lang.String) (id=209)	
> 					valueType	Class<T> (java.lang.String) (id=209)	
> 				staticAdapter	null	
> 				valueType	Class<T> (java.lang.String) (id=209)	
> 			xducer	RuntimeBuiltinLeafInfoImpl$1  (id=260)	
> I have seen an old bug reference CXF-457 which clears the threadlocal at the end of invoke()
method in JaxWsMethodInvoker.  The proxy used in my case is JaxWsClientProxy. I found that
after the method invocation the response is cleared from the threadlocals, but several parameter
names remain there.
> I think my setup is OK. We passed a lot of tests, including 3M successful generated (test)load
transactions.
> Any suggestions?
> Kind Regards,
> Danny

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