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https://issues.apache.org/jira/browse/WICKET-3050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12913223#action_12913223
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Igor Vaynberg commented on WICKET-3050:
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we call the method so we can replace objects while we are serializing them. we
replace objects while serializing them so that we can replace references to
pages with points to the pagestore so we do not have two different instances of
a page with the same id.
> AccessControlException thrown when security manager denies access
> -----------------------------------------------------------------
>
> Key: WICKET-3050
> URL: https://issues.apache.org/jira/browse/WICKET-3050
> Project: Wicket
> Issue Type: Bug
> Environment: Google App Engine
> Reporter: Clint Checketts
> Priority: Trivial
> Fix For: 1.4.13, 1.5-M3
>
> Attachments: enableReplaceObject_patch.txt
>
>
> Google App Engine locks down various environmental pieces. The ModelChange
> class tries to do some serialization which causes the exception.
> Caused by: java.security.AccessControlException: access denied
> (java.io.SerializablePermission enableSubstitution)
> at
> java.security.AccessControlContext.checkPermission(AccessControlContext.java:355)
> at
> java.security.AccessController.checkPermission(AccessController.java:567)
> at java.lang.SecurityManager.checkPermission(SecurityManager.java:549)
> at
> java.io.ObjectOutputStream.enableReplaceObject(ObjectOutputStream.java:609)
> at
> org.apache.wicket.util.lang.Objects$ReplaceObjectOutputStream.<init>(Objects.java:183)
> at
> org.apache.wicket.util.lang.Objects$ReplaceObjectOutputStream.<init>(Objects.java:174)
> at org.apache.wicket.util.lang.Objects.cloneModel(Objects.java:461)
> at
> org.apache.wicket.version.undo.ModelChange.<init>(ModelChange.java:103)
> at
> org.apache.wicket.version.undo.ChangeList.componentModelChanging(ChangeList.java:64)
> at
> org.apache.wicket.version.undo.UndoPageVersionManager.componentModelChanging(UndoPageVersionManager.java:123)
> at org.apache.wicket.Page.componentModelChanging(Page.java:1598)
> at org.apache.wicket.Component.modelChanging(Component.java:2206)
> at
> org.apache.wicket.Component.setDefaultModelObject(Component.java:3046)
> at
> org.apache.wicket.extensions.markup.html.tabs.TabbedPanel.setSelectedTab(TabbedPanel.java:338)
> at
> org.apache.wicket.extensions.markup.html.tabs.TabbedPanel$5.onClick(TabbedPanel.java:319)
> at org.apache.wicket.markup.html.link.Link.onLinkClicked(Link.java:224)
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