I'm getting a WicketNotSerializableException on a couple of my pages. The
field that seems to be not serializable appears to be a Wicket class,
org.apache.wicket.util.value.ValueMap$NullSafeKeyComparator. Any
suggestions? I saw a posting on the list earlier today that I though may
have something to do with it, but I cannot find the reference now.
Here's the stacktrace for the exception I'm getting:
ERROR Objects:1114 - Error serializing object class
com.mycompany.MyPage[object=[Page class = com.mycompany.MyPage, id = 3,
version = 0, ajax = 0]]
org.apache.wicket.util.io.SerializableChecker$WicketNotSerializableException:
Unable to serialize class:
org.apache.wicket.util.value.ValueMap$NullSafeKeyComparator
Field hierarchy is:
3 [class=com.mycompany.MyPage, path=3]
java.lang.Object org.apache.wicket.Component.data
[class=[Ljava.lang.Object;]
private org.apache.wicket.spring.ISpringContextLocator
org.apache.wicket.spring.SpringBeanLocator.springContextLocator[1]
[class=[Lorg.apache.wicket.MetaDataEntry;]
private org.apache.wicket.spring.ISpringContextLocator
org.apache.wicket.spring.SpringBeanLocator.springContextLocator[1][0]
[class=org.apache.wicket.MetaDataEntry]
java.lang.Object org.apache.wicket.MetaDataEntry.object
[class=org.apache.wicket.PageParameters]
private java.util.Comparator java.util.TreeMap.comparator
[class=org.apache.wicket.util.value.ValueMap$NullSafeKeyComparator] <-----
field that is not serializable
at
org.apache.wicket.util.io.SerializableChecker.check(SerializableChecker.java:349)
at
org.apache.wicket.util.io.SerializableChecker.checkFields(SerializableChecker.java:618)
at
org.apache.wicket.util.io.SerializableChecker.check(SerializableChecker.java:541)
at
org.apache.wicket.util.io.SerializableChecker.checkFields(SerializableChecker.java:618)
at
org.apache.wicket.util.io.SerializableChecker.check(SerializableChecker.java:541)
at
org.apache.wicket.util.io.SerializableChecker.check(SerializableChecker.java:395)
at
org.apache.wicket.util.io.SerializableChecker.check(SerializableChecker.java:395)
at
org.apache.wicket.util.io.SerializableChecker.checkFields(SerializableChecker.java:618)
at
org.apache.wicket.util.io.SerializableChecker.check(SerializableChecker.java:541)
at
org.apache.wicket.util.io.SerializableChecker.writeObjectOverride(SerializableChecker.java:687)
at java.io.ObjectOutputStream.writeObject(Unknown Source)
at
org.apache.wicket.util.io.IObjectStreamFactory$DefaultObjectStreamFactory$2.writeObjectOverride(IObjectStreamFactory.java:127)
at java.io.ObjectOutputStream.writeObject(Unknown Source)
at
org.apache.wicket.util.lang.Objects.objectToByteArray(Objects.java:1100)
at
org.apache.wicket.protocol.http.pagestore.AbstractPageStore.serializePage(AbstractPageStore.java:200)
at
org.apache.wicket.protocol.http.pagestore.DiskPageStore.storePage(DiskPageStore.java:814)
at
org.apache.wicket.protocol.http.SecondLevelCacheSessionStore$SecondLevelCachePageMap.put(SecondLevelCacheSessionStore.java:327)
at org.apache.wicket.Session.requestDetached(Session.java:1391)
at org.apache.wicket.RequestCycle.detach(RequestCycle.java:1113)
at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1384)
at org.apache.wicket.RequestCycle.request(RequestCycle.java:499)
at
org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:387)
at
org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:199)
at
org.mortbay.jetty.servlet.WebApplicationHandler$Chain.doFilter(WebApplicationHandler.java:334)
at
org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:174)
at
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:77)
at
org.mortbay.jetty.servlet.WebApplicationHandler$Chain.doFilter(WebApplicationHandler.java:334)
at
org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(WebApplicationHandler.java:286)
at
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:558)
at org.mortbay.http.HttpContext.handle(HttpContext.java:1714)
at
org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplicationContext.java:507)
at org.mortbay.http.HttpContext.handle(HttpContext.java:1664)
at org.mortbay.http.HttpServer.service(HttpServer.java:863)
at org.mortbay.http.HttpConnection.service(HttpConnection.java:775)
at org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:939)
at org.mortbay.http.HttpConnection.handle(HttpConnection.java:792)
at
org.mortbay.http.SocketListener.handleConnection(SocketListener.java:201)
at org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:289)
at org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:455)
Caused by: java.io.NotSerializableException:
org.apache.wicket.util.value.ValueMap$NullSafeKeyComparator
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
at java.io.ObjectOutputStream.defaultWriteObject(Unknown Source)
at java.util.TreeMap.writeObject(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
--
Matthew Rollins Hanlon
http://squareoftwo.org
_____________________
Hanlon's Razor:
"Never attribute to malice that which can be adequately explained by
stupidity."
http://wikipedia.org/wiki/Hanlon's_razor<http://wikipedia.org/wiki/Hanlon%27s_razor>
