PK26183: NOCLASSDEFFOUNDERROR SEEN WHEN HTTPSESSION DESERIALIZES AN OBJECT.

Fixes are available

APAR status

Closed as program error.

Error description

Symptoms:
The customer frequently faces NoClassDefFoundError at
reflection. There are two types of failures.

Case1)
----------------------------------------------------------------
-
SystemOut     O 1    [WebContainer : 1]
ERROR org.apache.struts.util.RequestUtils  -
 Error creating form bean of class
 java.lang.NoClassDefFoundError:
...
  org/apache/struts/validator/ValidatorForm
 at sun.reflect.NativeConstructorAccessorImpl.newInstance0
   (Native Method)
 at sun.reflect.NativeConstructorAccessorImpl.newInstance
   (NativeConstructorAccessorImpl.java(Compiled Code))
 at sun.reflect.DelegatingConstructorAccessorImpl.newInstance
   (DelegatingConstructorAccessorImpl.java(Compiled Code))
 at java.lang.reflect.Constructor.newInstance(Constructor.java
   (Compiled Code))
 at java.lang.Class.newInstance3(Class.java(Compiled Code))
 at java.lang.Class.newInstance(Class.java(Compiled Code))
 at org.apache.struts.util.RequestUtils.applicationInstance
   (RequestUtils.java:231)
----------------------------------------------------------------
-
.
Case2)
----------------------------------------------------------------
-
SystemOut     O 10186     WebContainer : 1]
ERROR jp.co.XXXXX_sales.logging.CabaLogging  -
 java.lang.NoClassDefFoundError:
....
 at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessor
Impl.j
 ava(Compiled Code))
  at
 sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccesso
rImpl.j
 ava(Compiled Code))
  at
 sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMetho
dAccess
 orImpl.java(Compiled Code))
  at java.lang.reflect.Method.invoke(Method.java(Compiled Code))
 ---------------------------------------------------------------
--


Analysis:
When an ExceptionInInitializerException is thrown while running
static initializers of a class, the class is marked as being
invalid. Subsequent attempts to use the class will result in a
NoClassDefFoundError.  I think that fixing the
ExceptionInInitializerError will fix the NoClassDefFoundError.

I believe that the problem is that the wrong context classloader
is in place when the httpsession deserializes an object.
Deserializing loads a class for the first time, which
initializes the ValidatorForm struts class, which initializes
commons logging, which attempts to load the Jdk14Logger class
from the (wrong) context classloader.

The stack trace of the error includes:

at com.ibm.ws.webcontainer.httpsession.BackedHashtable.
    oracleGetValue(BackedHashtable.java:3016)
at com.ibm.ws.webcontainer.httpsession.BackedHashtable.getValue
    (BackedHashtable.java:1331)
at com.ibm.ws.webcontainer.httpsession.DatabaseSessionData.
    fillAppData(DatabaseSessionData.java:812)
at com.ibm.ws.webcontainer.httpsession.DatabaseSessionData.
    getSwappableData(DatabaseSessionData.java:328)
at com.ibm.ws.webcontainer.httpsession.DatabaseSessionData.
    checkActivationListeners(DatabaseSessionData.java:355)
at com.ibm.ws.webcontainer.httpsession.SessionData.
    notifyActivateListeners(SessionData.java:1335)
at com.ibm.ws.webcontainer.httpsession.SessionContext.
    getIHttpSession(SessionContext.java:1509)
at com.ibm.ws.webcontainer.httpsession.SessionContext.
    getIHttpSession(SessionContext.java:2432)
at com.ibm.ws.webcontainer.httpsession.SessionContext.
    sessionPreInvoke(SessionContext.java:2695)
at com.ibm.ws.webcontainer.srt.SRTRequestContext.
     sessionPreInvoke(SRTRequestContext.java:56)
at com.ibm.ws.webcontainer.webapp.WebAppDispatcherContext.
    sessionPreInvoke(WebAppDispatcherContext.java:284)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest
    (ServletWrapper.java:467)

I believe that the context classloader needs to be set to the
application classloader while loading the application class.
This could either be done in ServletWrapper.handleRequest or
BackedHashtable.getValue.
  .

In looking at the traces, it appears we may need to set the
context classloader before the sessionPreInvoke which
deserializes the class that leads to the commons logging
exception.

Local fix

```
I-fix available from L2 support
```

Problem summary

****************************************************************
* USERS AFFECTED: WebSphere Application Server version 6 users *
*                                                              *
*                 who get an ExceptionInInitializerException   *
*                                                              *
*                 when running static initializer of a class.  *
****************************************************************
* PROBLEM DESCRIPTION: A NoClassDefFoundError exception is     *
*                      raised when deploying the application   *
*                      containing the class.                   *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
If an ExceptionInInitializerException is thrown while running
static initializers of a class, the class is marked as being
invalid.

A NoClassDefFoundError exception is then received when
deploying an application after server restart. The problem
goes away if the application is restarted.

There are two ways in which the NoClassDefFound error may be
reported:



Case1)
-------------------------------------------------------------
SystemOut     O 1    [WebContainer : 1]
ERROR org.apache.struts.util.RequestUtils  - Error creating
form
bean of class jp.co.comp_sales.ccrs.form.FbCcrsDispInfo
java.lang.NoClassDefFoundError:
org/apache/struts/validator/ValidatorForm
at sun.reflect.NativeConstructorAccessorImpl.newInstance0
(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance
(NativeConstructorAccessorImpl.java(Compiled Code))
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance
(DelegatingConstructorAccessorImpl.java(Compiled Code))
at java.lang.reflect.Constructor.newInstance(Constructor.java
(Compiled Code))
at java.lang.Class.newInstance3(Class.java(Compiled Code))
at java.lang.Class.newInstance(Class.java(Compiled Code))
at org.apache.struts.util.RequestUtils.applicationInstance
(RequestUtils.java:231)
-------------------------------------------------------------



Case 2)
-------------------------------------------------------------
SystemOut     O 10186     WebContainer : 1] ERROR
jp.co.comp_sales.logging.CabaLogging  -
jp.co.comp_sales.ccrs.action.CcrsDispInfoAction
java.lang.NoClassDefFoundError:
jp/co/comp_sales/ccrs/form/FbCcrsDispInfo
at
jp.co.comp_sales.ccrs.util.CcrsActionUtil.getInfoVOandGroupList
(CcrsActionUtil.java:4156)
at jp.co.comp_sales.ccrs.util.CcrsActionUtil.doInitDispInfo
(CcrsActionUtil.java:4097)
at  jp.co.comp_sales.ccrs.action.CcrsDispInfoAction.execute
(CcrsDispInfoAction.java:138)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
....

The problem is that the wrong context classloader is in place
when the httpsession deserializes an object. Deserializing
loads a class for the first time, which initializes the
ValidatorForm struts class, which initializes commons logging,
which attempts to load the Jdk14Logger class from the (wrong)
context classloader.



The stack trace of the error includes:



at com.ibm.ws.webcontainer.httpsession.BackedHashtable.
oracleGetValue(BackedHashtable.java:3016)
at com.ibm.ws.webcontainer.httpsession.BackedHashtable.
getValue (BackedHashtable.java:1331)
at com.ibm.ws.webcontainer.httpsession.DatabaseSessionData.
fillAppData(DatabaseSessionData.java:812)
at com.ibm.ws.webcontainer.httpsession.DatabaseSessionData.
getSwappableData(DatabaseSessionData.java:328)
at com.ibm.ws.webcontainer.httpsession.DatabaseSessionData.
checkActivationListeners(DatabaseSessionData.java:355)
at com.ibm.ws.webcontainer.httpsession.SessionData.
notifyActivateListeners(SessionData.java:1335)
at com.ibm.ws.webcontainer.httpsession.SessionContext.
getIHttpSession(SessionContext.java:1509)
at com.ibm.ws.webcontainer.httpsession.SessionContext.
getIHttpSession(SessionContext.java:2432)
at com.ibm.ws.webcontainer.httpsession.SessionContext.
sessionPreInvoke(SessionContext.java:2695)
at com.ibm.ws.webcontainer.srt.SRTRequestContext.
sessionPreInvoke(SRTRequestContext.java:56)
at com.ibm.ws.webcontainer.webapp.WebAppDispatcherContext.
sessionPreInvoke(WebAppDispatcherContext.java:284)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.
handleRequest (ServletWrapper.java:467)

Problem conclusion

To fix the problem the context classloader is set before
the sessionPreInvoke call which results in de-serialization
of the class and a commons logging exception. This is done
in ServletWrapper.handleRequest.

The fix for this APAR is currently targeted for inclusion
in fixpacks 6.0.2.17 and 6.1.0.3.
Please refer to the recommended updates page for delivery
information:
http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980

Temporary fix

Comments

APAR Information

APAR number
PK26183
Reported component name
WEBSPH APP SERV
Reported component ID
5724J0800
Reported release
60A
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2006-06-07
Closed date
2006-08-29
Last modified date
2013-08-22

APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:

Modules/Macros

```
ENGINE
```

Fix information

Fixed component name
WEBSPH APP SERV
Fixed component ID
5724J0800

Applicable component levels

R60A PSY
UP
R60H PSY
UP
R60I PSY
UP
R60P PSY
UP
R60S PSY
UP
R60W PSY
UP
R60Z PSY
UP
R61A PSY
UP
R61H PSY
UP
R61I PSY
UP
R61P PSY
UP
R61S PSY
UP
R61W PSY
UP
R61Z PSY
UP

[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSEQTP","label":"WebSphere Application Server"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"6.0","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
29 December 2021

Tips

PK26183: NOCLASSDEFFOUNDERROR SEEN WHEN HTTPSESSION DESERIALIZES AN OBJECT.

Fixes are available

Subscribe

APAR status

Closed as program error.

Error description

Local fix

Problem summary

Problem conclusion

Temporary fix

Comments

APAR Information

APAR number

Reported component name

Reported component ID

Reported release

Status

PE

HIPER

Special Attention

Submitted date

Closed date

Last modified date

APAR is sysrouted FROM one or more of the following:

APAR is sysrouted TO one or more of the following:

Modules/Macros

Fix information

Fixed component name

Fixed component ID

Applicable component levels

R60A PSY

R60H PSY

R60I PSY

R60P PSY

R60S PSY

R60W PSY

R60Z PSY

R61A PSY

R61H PSY

R61I PSY

R61P PSY

R61S PSY

R61W PSY

R61Z PSY

Document Information

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