This is the result of some general bugginess in EOCustomObject and
EOGenericRecord classes. Their serialization is intertwined in such a way as to
cause null pointer exceptions.
When you add the persistent session storage framework to your build path, make
sure the framework is at the very top of your classpath just under
ERExtensions. If it is listed below the EOControl framework, it will not work
properly. It might work long enough to appear to be working properly, but
you'll definitely get the NPEs at some point :-)
If you still get NPEs after correctly ordering your build path, you may find
there is still some bugginess in those two classes. I fixed them so that they
work in all the cases I use them, but I have bumped into a couple of cases
where the NPE rears its ugly head. Usually I just slightly change the way I'm
doing something and it will disappear. For instance, in this case, you may try
storing your user in your session.objectStore instead of on an iVar.
If you hit a real blocker, or just feel like working on it, those two classes
may still need a couple of tweaks to make serialization of EOs bulletproof. By
the time I got to reimplementing them for persistent sessions, I was becoming
bored with it :-) Fixing serialization bugs is The Fun™
Ramsey
On Jul 29, 2013, at 5:57 AM, Christoph Wick wrote:
> Hi List,
>
> I was trying to use ERPersistentSessionStorage (looks otherwise very
> promising, thx Ramsey).
>
> I'm getting a silly NullPointerException (stacktrace below) in an application
> that was working perfectly before without using ERPersistantSessionStorage. I
> have no idea how to debug this to get more information.
>
> The problem may come from storing an EO object called PMSUser in the session
> (basically a user object with name, login, passwd ... PMS=prefix for the
> project's classes). The code is:
>
> public class Session extends ERXSession {
>
> private PMSUser currentUser = null;
>
> public PMSUser currentUser() {
> return currentUser;
> }
>
> public void setCurrentUser(PMSUser currentUser) {
> this.currentUser = currentUser;
> }
> ...
> }
>
> The page where the error occurs is the one where the user can change his/her
> personal data using a form like
>
> <wo:form>
> <wo:textfield id="inputGivenName" value =
> "$session.currentUser.firstName" />
> ...
> <wo:submitButton action="$saveAction" value="save" />
> </wo:form>
>
> but NOT AFTER saving, but directly before rendering the page with the form.
>
> Any ideas? Thanks in advance,
> C.U.CW
> --
>
> Christoph Wick - Diplom Informatiker, Managing Director
> i4innovation GmbH, Professor-Neu-Allee 39, 53225 Bonn, Germany
>
> T +49 2 28 28 62 97 93
> M +49 1 51 22 65 78 90
> F +49 2 28 28 62 97 99
> M [email protected]
> W www.i4innovation.de
>
> Geschäftsführer: Thomas Heep, Christoph Wick
> Sitz der Gesellschaft: Bonn | Amtsgericht Bonn HRB 18548 | USt-IdNr.:
> DE276502600
>
>
> Jul 29 14:41:01 PMS[65432] WARN NSLog -
> <er.extensions.appserver.ERXComponentRequestHandler>: Exception occurred
> while handling request:
> java.lang.NullPointerException
> [2013-7-29 14:41:1 MESZ] <WorkerThread0> java.lang.NullPointerException
> at
> com.webobjects.eocontrol.EOCustomObject.willReadRelationship(EOCustomObject.java:834)
> at
> er.extensions.eof.ERXGenericRecord.willReadRelationship(ERXGenericRecord.java:380)
> at
> com.webobjects.eocontrol._EOMutableKnownKeyDictionary$Initializer$_LazyGenericRecordBinding.valueInObject(_EOMutableKnownKeyDictionary.java:614)
> at
> er.extensions.eof.ERXGenericRecord$TouchingBinding.valueInObject(ERXGenericRecord.java:209)
> at
> com.webobjects.eocontrol.EOCustomObject.storedValueForKey(EOCustomObject.java:990)
> at
> com.webobjects.eocontrol.EOEditingContext._valuesForObject(EOEditingContext.java:790)
> at
> com.webobjects.eocontrol.EOCustomObject.writeObject(EOCustomObject.java:1125)
> at sun.reflect.GeneratedMethodAccessor42.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:601)
> at
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:975)
> at
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1480)
> at
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)
> at
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1528)
> at
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1493)
> at
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)
> at java.io.ObjectOutputStream.writeArray(ObjectOutputStream.java:1362)
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1170)
> at java.io.ObjectOutputStream.access$300(ObjectOutputStream.java:161)
> at
> java.io.ObjectOutputStream$PutFieldImpl.writeFields(ObjectOutputStream.java:1687)
> at java.io.ObjectOutputStream.writeFields(ObjectOutputStream.java:478)
> at
> com.webobjects.foundation.NSDictionary.writeObject(NSDictionary.java:594)
> at sun.reflect.GeneratedMethodAccessor19.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:601)
> at
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:975)
> at
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1480)
> at
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)
> at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:346)
> at
> com.webobjects.appserver.WOComponent.writeObject(WOComponent.java:314)
> at sun.reflect.GeneratedMethodAccessor35.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:601)
> at
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:975)
> at
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1480)
> at
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)
> at java.io.ObjectOutputStream.writeArray(ObjectOutputStream.java:1362)
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1170)
> at java.io.ObjectOutputStream.access$300(ObjectOutputStream.java:161)
> at
> java.io.ObjectOutputStream$PutFieldImpl.writeFields(ObjectOutputStream.java:1687)
> at java.io.ObjectOutputStream.writeFields(ObjectOutputStream.java:478)
> at
> com.webobjects.foundation.NSDictionary.writeObject(NSDictionary.java:594)
> at sun.reflect.GeneratedMethodAccessor19.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:601)
> at
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:975)
> at
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1480)
> at
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)
> at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:346)
> at
> com.webobjects.appserver.WOComponent.writeObject(WOComponent.java:314)
> at sun.reflect.GeneratedMethodAccessor35.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:601)
> at
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:975)
> at
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1480)
> at
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)
> at
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1528)
> at
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1493)
> at
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)
> at java.io.ObjectOutputStream.writeArray(ObjectOutputStream.java:1362)
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1170)
> at java.io.ObjectOutputStream.access$300(ObjectOutputStream.java:161)
> at
> java.io.ObjectOutputStream$PutFieldImpl.writeFields(ObjectOutputStream.java:1687)
> at java.io.ObjectOutputStream.writeFields(ObjectOutputStream.java:478)
> at
> com.webobjects.foundation.NSDictionary.writeObject(NSDictionary.java:594)
> at sun.reflect.GeneratedMethodAccessor19.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:601)
> at
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:975)
> at
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1480)
> at
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)
> at
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1528)
> at
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1493)
> at
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)
> at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:346)
> at
> er.persistentsessionstorage.model.ERSessionInfo.archiveDataFromSession(ERSessionInfo.java:61)
> at
> er.persistentsessionstorage.ERPersistentSessionStore.saveSessionForContext(ERPersistentSessionStore.java:46)
> at
> com.webobjects.appserver.WOSessionStore.checkInSessionForContext(WOSessionStore.java:234)
> at
> com.webobjects.appserver.WOApplication.saveSessionForContext(WOApplication.java:1892)
> at
> er.extensions.appserver.ERXApplication.saveSessionForContext(ERXApplication.java:2381)
> at
> er.extensions.appserver.ERXComponentRequestHandler._dispatchWithPreparedApplication(ERXComponentRequestHandler.java:273)
> at
> er.extensions.appserver.ERXComponentRequestHandler._handleRequest(ERXComponentRequestHandler.java:302)
> at
> er.extensions.appserver.ERXComponentRequestHandler.handleRequest(ERXComponentRequestHandler.java:378)
> at
> com.webobjects.appserver.WOApplication.dispatchRequest(WOApplication.java:1687)
> at
> er.extensions.appserver.ERXApplication.dispatchRequestImmediately(ERXApplication.java:2109)
> at
> er.extensions.appserver.ERXApplication.dispatchRequest(ERXApplication.java:2074)
> at
> com.webobjects.appserver._private.WOWorkerThread.runOnce(WOWorkerThread.java:144)
> at
> com.webobjects.appserver._private.WOWorkerThread.run(WOWorkerThread.java:226)
> at java.lang.Thread.run(Thread.java:722)
>
>
>
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