XPAges: "java.io.NotSerializableException: lotus.domino.local.Document" - jsf

Question

I have an XPage which holds one Notes document. The intention of this page is just to show some relevant fields of the document.
Accessing the page first time is ok. And also when showing later again without changing the underlaying document is ok.
But when I navigate from this to another XPage, and change the document there (yes, I have another page dedicated to edit the document), and then come back to the "show" page, I get the java.io.NotSerializableException in the render Response Phase.
Strange: it is for a lotus.domino.local.Document ... I never want to save/serialize a document ... :-o
What I've done to find the bug in my code:
I logged the viewScope content in beforeRenderResponse Event of the page, but there are only simple objects (strings and booleans).
I set the viewState of the page to "nostate".
I set the readonly attribute of the page to "true".
I removed every "on page loading" data-bindings (switched '${...}' to '#{...}')
So what else can I do to find the point of code, where some kind of document want to be saved?
What are typical error causes in this case?
Thanks for any help to help myself! :-)
My Stacktrace:
23.11.16 10:30: Exception Thrown
Context Path: /.../.../myApp.nsf
Page Name: /page_ShowData.xsp
com.ibm.xsp.FacesExceptionEx: java.io.NotSerializableException: lotus.domino.local.Document
at com.ibm.xsp.application.AbstractStateManager.saveSerializedView(AbstractStateManager.java:121)
at com.ibm.xsp.application.StateManagerImpl.saveSerializedView(StateManagerImpl.java:152)
at com.ibm.xsp.application.ViewHandlerExImpl._saveViewState(ViewHandlerExImpl.java:455)
at com.ibm.xsp.application.ViewHandlerExImpl.saveViewState(ViewHandlerExImpl.java:449)
at com.ibm.xsp.application.ViewHandlerExImpl._renderView(ViewHandlerExImpl.java:324)
at com.ibm.xsp.application.ViewHandlerExImpl.renderView(ViewHandlerExImpl.java:336)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:103)
at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:210)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:120)
at com.ibm.xsp.controller.FacesControllerImpl.render(FacesControllerImpl.java:270)
at com.ibm.xsp.webapp.FacesServlet.serviceView(FacesServlet.java:261)
at com.ibm.xsp.webapp.FacesServletEx.serviceView(FacesServletEx.java:157)
at com.ibm.xsp.webapp.FacesServlet.service(FacesServlet.java:160)
at com.ibm.xsp.webapp.FacesServletEx.service(FacesServletEx.java:138)
at com.ibm.xsp.webapp.DesignerFacesServlet.service(DesignerFacesServlet.java:103)
at com.ibm.designer.runtime.domino.adapter.ComponentModule.invokeServlet(ComponentModule.java:588)
at com.ibm.domino.xsp.module.nsf.NSFComponentModule.invokeServlet(NSFComponentModule.java:1335)
at com.ibm.designer.runtime.domino.adapter.ComponentModule$AdapterInvoker.invokeServlet(ComponentModule.java:865)
at com.ibm.designer.runtime.domino.adapter.ComponentModule$ServletInvoker.doService(ComponentModule.java:808)
at com.ibm.designer.runtime.domino.adapter.ComponentModule.doService(ComponentModule.java:577)
at com.ibm.domino.xsp.module.nsf.NSFComponentModule.doService(NSFComponentModule.java:1319)
at com.ibm.domino.xsp.module.nsf.NSFService.doServiceInternal(NSFService.java:662)
at com.ibm.domino.xsp.module.nsf.NSFService.doService(NSFService.java:482)
at com.ibm.designer.runtime.domino.adapter.LCDEnvironment.doService(LCDEnvironment.java:357)
at com.ibm.designer.runtime.domino.adapter.LCDEnvironment.service(LCDEnvironment.java:313)
at com.ibm.domino.xsp.bridge.http.engine.XspCmdManager.service(XspCmdManager.java:272)
Caused by: java.io.NotSerializableException: lotus.domino.local.Document
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1185)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:346)
at java.util.ArrayList.writeObject(ArrayList.java:728)
at sun.reflect.GeneratedMethodAccessor652.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
at java.lang.reflect.Method.invoke(Method.java:611)
at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1059)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1502)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:346)
at java.util.HashMap.writeObject(HashMap.java:942)
at sun.reflect.GeneratedMethodAccessor637.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
at java.lang.reflect.Method.invoke(Method.java:611)
at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1059)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1502)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179)
at java.io.ObjectOutputStream.writeUnshared(ObjectOutputStream.java:413)
at com.ibm.xsp.application.AbstractSerializingStateManager$FastObjectOutputStream.writeObjectEx(AbstractSerializingStateManager.java:438)
at com.ibm.xsp.application.AbstractSerializingStateManager$FastObjectOutputStream.writeObjectEx(AbstractSerializingStateManager.java:417)
at com.ibm.xsp.application.AbstractSerializingStateManager$FastObjectOutputStream.writeObjectEx(AbstractSerializingStateManager.java:417)
at com.ibm.xsp.application.AbstractSerializingStateManager$FastObjectOutputStream.writeObjectEx(AbstractSerializingStateManager.java:417)
at com.ibm.xsp.application.AbstractSerializingStateManager$FastObjectOutputStream.writeObjectEx(AbstractSerializingStateManager.java:417)
at com.ibm.xsp.application.AbstractSerializingStateManager.saveSerializedView(AbstractSerializingStateManager.java:294)
at com.ibm.xsp.application.AbstractSerializingStateManager.doSaveSerializedView(AbstractSerializingStateManager.java:269)
at com.ibm.xsp.application.FileStateManager.doSaveSerializedView(FileStateManager.java:290)
at com.ibm.xsp.application.FileStateManager.doSaveSerializedView(FileStateManager.java:270)
at com.ibm.xsp.application.AbstractStateManager.saveSerializedView(AbstractStateManager.java:114)
... 25 more
My page_ShowData.xsp:
<?xml version="1.0" encoding="UTF-8"?>
<xp:view xmlns:xp="http://www.ibm.com/xsp/core" pageTitle="Show Data"
xmlns:xc="http://www.ibm.com/xsp/custom"
xmlns:xe="http://www.ibm.com/xsp/coreex" readonly="true"
viewState="nostate"
afterPageLoad="#{javascript:print('page_ShowData.afterPageLoad()');}">
<!-- ... -->
<xp:this.data>
<xp:dominoDocument var="stamm" formName="Masterdata" ignoreRequestParams="false">
<xp:this.action>
<![CDATA[#{javascript:
// ensure to set the unid if known
if (viewScope.stammid == null){
viewScope.stammid = param.get('documentId');
}
if(typeof viewScope.stammid == "undefined" || viewScope.stammid == null || viewScope.stammid == ""){
return; // empty means 'create'
} else {
return 'openDocument';
}
}]]>
</xp:this.action>
<xp:this.documentId>
<![CDATA[#{javascript:return viewScope.stammid;}]]>
</xp:this.documentId>
<xp:this.postOpenDocument>
<![CDATA[#{javascript:
<!-- set some viewScope vars -->
}]]>
</xp:this.postOpenDocument>
<xp:this.postNewDocument>
<![CDATA[#{javascript:
<!-- set some viewScope vars -->
}]]>
</xp:this.postNewDocument>
</xp:dominoDocument>
</xp:this.data>
<!-- ... -->
<xp:this.beforeRenderResponse>
<![CDATA[#{javascript:
try{
// print all viewScope vars
var vsKeys:java.util.Set = viewScope.keySet();
for (var k in vsKeys){
var v = viewScope.get(k);
print('viewScope - ['+k.toString()+'] (serializable='+(k instanceof java.io.Serializable)+') = ['+v+'] (instance='+(typeof v)+', serializable='+(v instanceof java.io.Serializable)+')');
}
}]]>
</xp:this.beforeRenderResponse>
<!-- some UI content -->
</xp:view>

Answer 1

On one of those two XPages you're storing a NotesDocument (not DominoDocument datasource, but a NotesDocument object) in a scoped variable. Domino objects aren't serializable, which is what's throwing the error. The most likely place is the page you're moving from.
If you need access to a specific document, store the UNID of the document in the scoped variable and use database.getDocumentByUNID() to retrieve it. That's almost certainly what the DominoDocument datasource does.