Every once in a while I get these classnotfoundexceptions for some odd reason
which I cant figure out why. The class does exist (its a panel as you can
tell from the classname) and is serializeable with one of the members
IClusterable. It happens atleast few times a day and dont know why - 

Will appreciate any pointers or how to go about debugging these kind of
issues...

Here is the stacktrace.

The URL that causes this
http://localhost/search/bizfon 4000/true/

THe resulting URL in the browser
http://localhost/?wicket:interface=:16:bodyContentContainer:leftBarPanel:searchForm::IFormSubmitListener::

Exception report

message

description The server encountered an internal error () that prevented it
from fulfilling this request.

exception

javax.servlet.ServletException: Filter execution threw an exception

root cause

java.lang.NoClassDefFoundError:
com/neobits/web/panels/VerticalLinkItemListWithCountPanel
    java.lang.Class.getDeclaredFields0(Native Method)
    java.lang.Class.privateGetDeclaredFields(Class.java:2259)
    java.lang.Class.getDeclaredField(Class.java:1852)
    java.io.ObjectStreamClass.getDeclaredSUID(ObjectStreamClass.java:1582)
    java.io.ObjectStreamClass.access$700(ObjectStreamClass.java:52)
    java.io.ObjectStreamClass$2.run(ObjectStreamClass.java:408)
    java.security.AccessController.doPrivileged(Native Method)
    java.io.ObjectStreamClass.<init>(ObjectStreamClass.java:400)
    java.io.ObjectStreamClass.lookup(ObjectStreamClass.java:297)
    java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:531)
    java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1552)
    java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1466)
    java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1552)
    java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1466)
   
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1699)
    java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
    java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
    org.apache.wicket.util.lang.Objects.byteArrayToObject(Objects.java:393)
   
org.apache.wicket.protocol.http.pagestore.AbstractPageStore.deserializePage(AbstractPageStore.java:228)
   
org.apache.wicket.protocol.http.pagestore.DiskPageStore.getPage(DiskPageStore.java:706)
   
org.apache.wicket.protocol.http.SecondLevelCacheSessionStore$SecondLevelCachePageMap.get(SecondLevelCacheSessionStore.java:311)
    org.apache.wicket.Session.getPage(Session.java:751)
   
org.apache.wicket.request.AbstractRequestCycleProcessor.resolveRenderedPage(AbstractRequestCycleProcessor.java:448)
   
org.apache.wicket.protocol.http.WebRequestCycleProcessor.resolve(WebRequestCyclePr
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