[ 
https://issues.apache.org/jira/browse/ISIS-2398?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Andi Huber reassigned ISIS-2398:
--------------------------------

    Assignee: Andi Huber

> Rendering a StandaloneCollectionPage in Wicket throws Optional not 
> serializable exception
> -----------------------------------------------------------------------------------------
>
>                 Key: ISIS-2398
>                 URL: https://issues.apache.org/jira/browse/ISIS-2398
>             Project: Isis
>          Issue Type: Improvement
>    Affects Versions: 2.0.0-M3
>            Reporter: Daniel Keir Haywood
>            Assignee: Andi Huber
>            Priority: Minor
>             Fix For: 2.0.0-M4
>
>
> For demo app, this occurs when Prototyping > Run Fixture Script.  See 
> stacktrace
> This seems to be just noise in the logs, but even so....
> {code:java}
> 2020-07-09 06:36:13.588 ERROR 3524 --- [ageSavingThread] 
> o.a.w.s.j.JavaSerializer                 : Error serializing object class 
> org.apache.isis.viewer.wicket.ui.pages.standalonecollection.StandaloneCollectionPage
>  [object=[Page class = 
> org.apache.isis.viewer.wicket.ui.pages.standalonecollection.StandaloneCollectionPage,
>  id = 4, render count = 
> 1]]org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream$ObjectCheckException:
>  The object type is not Serializable!
> A problem occurred while checking object with type: java.util.Optional
> Field hierarchy is:
>   4 
> [class=org.apache.isis.viewer.wicket.ui.pages.standalonecollection.StandaloneCollectionPage,
>  path=4]
>     private java.lang.Object org.apache.wicket.MarkupContainer.children 
> [class=java.util.ArrayList]
>       private java.lang.String 
> org.apache.isis.viewer.wicket.ui.components.widgets.favicon.Favicon.contentType[write:6][write:7][write:8]
>  [class=org.apache.wicket.markup.html.WebMarkupContainer, path=4:theme]
>         private java.lang.Object org.apache.wicket.MarkupContainer.children 
> [class=java.util.ArrayList]
>           private org.apache.isis.viewer.wicket.ui.ComponentType 
> org.apache.isis.viewer.wicket.ui.panels.PanelAbstract.componentType[write:12][write:13][write:20]
>  
> [class=org.apache.isis.viewer.wicket.ui.components.actionprompt.ActionPromptModalWindow,
>  path=4:theme:actionPromptModalWindow]
>             private java.lang.Object 
> org.apache.wicket.MarkupContainer.children [class=java.util.ArrayList]
>               private java.lang.Object 
> org.apache.wicket.MarkupContainer.children[write:3][write:5][write:8] 
> [class=org.apache.isis.viewer.wicket.ui.components.actions.ActionParametersPanel,
>  path=4:theme:actionPromptModalWindow:content]
>                 private java.lang.Object 
> org.apache.wicket.MarkupContainer.children [class=java.util.ArrayList]
>                   java.lang.Object 
> org.apache.wicket.Component.data[write:8][write:4][write:7] 
> [class=org.apache.isis.viewer.wicket.ui.components.actions.ActionParametersFormPanel,
>  path=4:theme:actionPromptModalWindow:content:parameters]
>                     private java.lang.Object 
> org.apache.wicket.MarkupContainer.children 
> [class=org.apache.isis.viewer.wicket.ui.components.actions.ActionParametersForm,
>  path=4:theme:actionPromptModalWindow:content:parameters:inputForm]
>                       private java.lang.Object 
> org.apache.wicket.MarkupContainer.children [class=java.util.ArrayList]
>                         private java.lang.Object 
> org.apache.wicket.MarkupContainer.children[write:1] 
> [class=org.apache.wicket.markup.repeater.RepeatingView, 
> path=4:theme:actionPromptModalWindow:content:parameters:inputForm:parameters]
>                           private java.lang.Object 
> org.apache.wicket.MarkupContainer.children [class=java.util.ArrayList]
>                             private java.lang.Object 
> org.apache.wicket.MarkupContainer.children[write:1] 
> [class=org.apache.wicket.markup.html.WebMarkupContainer, 
> path=4:theme:actionPromptModalWindow:content:parameters:inputForm:parameters:1]
>                               private java.lang.Object 
> org.apache.wicket.MarkupContainer.children 
> [class=org.apache.isis.viewer.wicket.ui.components.scalars.valuechoices.ValueChoicesSelect2Panel,
>  
> path=4:theme:actionPromptModalWindow:content:parameters:inputForm:parameters:1:scalarNameAndValue]
>                                 java.lang.Object 
> org.apache.wicket.Component.data [class=[Ljava.lang.Object;]
>                                   java.lang.Object 
> org.apache.wicket.Component.data[0] 
> [class=org.apache.isis.viewer.wicket.model.models.ScalarParameterModel]
>                                     private 
> org.apache.isis.viewer.wicket.model.models.InlinePromptContext 
> org.apache.isis.viewer.wicket.model.models.ScalarModel.inlinePromptContext 
> [class=org.apache.isis.viewer.wicket.model.models.InlinePromptContext]
>                                       private final 
> org.apache.wicket.Component 
> org.apache.isis.viewer.wicket.model.models.InlinePromptContext.scalarIfRegular
>  
> [class=org.apache.isis.viewer.wicket.ui.components.widgets.bootstrap.FormGroup,
>  
> path=4:theme:actionPromptModalWindow:content:parameters:inputForm:parameters:1:scalarNameAndValue:scalarTypeContainer:scalarIfRegular]
>                                         private java.lang.Object 
> org.apache.wicket.MarkupContainer.children [class=java.util.ArrayList]
>                                           private java.lang.Object 
> org.apache.wicket.MarkupContainer.children[write:1] 
> [class=org.apache.isis.viewer.wicket.ui.components.widgets.select2.Select2ChoiceExt,
>  
> path=4:theme:actionPromptModalWindow:content:parameters:inputForm:parameters:1:scalarNameAndValue:scalarTypeContainer:scalarIfRegular:scalarValue]
>                                             private 
> org.wicketstuff.select2.ChoiceProvider 
> org.wicketstuff.select2.AbstractSelect2Choice.provider 
> [class=org.apache.isis.viewer.wicket.ui.components.widgets.select2.providers.ObjectAdapterMementoProviderForValueChoices]
>                                               private final 
> org.apache.isis.core.commons.collections.Can 
> org.apache.isis.viewer.wicket.ui.components.widgets.select2.providers.ObjectAdapterMementoProviderForValueChoices.choiceMementos
>  [class=org.apache.isis.core.commons.collections.Can_Singleton]
>                                                 private final 
> java.util.concurrent.atomic.AtomicReference 
> org.apache.isis.core.commons.collections.Can_Singleton.singleton 
> [class=java.util.concurrent.atomic.AtomicReference]
>                                                   private volatile 
> java.lang.Object java.util.concurrent.atomic.AtomicReference.value 
> [class=java.util.Optional] <----- field that is causing the problem
>  {code}
>  



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