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https://issues.apache.org/jira/browse/WICKET-6109?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15192326#comment-15192326
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Martin Grigorov commented on WICKET-6109:
-----------------------------------------
[~aaime] Please test with 7.3.0-SNAPSHOT if you can before we release it.
> Enclosure - "IllegalArgumentException: Argument 'markup' may not be null"
> after app restart
> -------------------------------------------------------------------------------------------
>
> Key: WICKET-6109
> URL: https://issues.apache.org/jira/browse/WICKET-6109
> Project: Wicket
> Issue Type: Bug
> Components: wicket
> Affects Versions: 7.2.0
> Reporter: Vlastimil
> Assignee: Andrea Del Bene
> Fix For: 7.3.0, 8.0.0-M1
>
> Attachments: enclosure-id-quickstart.zip
>
>
> I've debugged it a bit and this is what happens:
> # Open some page with enclosure
> # Markup is parsed - {{ComponentTag}} of enclosure gets id:
> {{wicket_enclosure1011}}
> # {{Enclosure}} component is created and gets id from {{ComponentTag}}:
> {{wicket_enclosure1011}}
> # Page is rendered in browser - everything ok sofar
> # Restart server
> # Hit F5 in browser
> # Markup is parsed - {{ComponentTag}} of enclosure gets different id than in
> the first request: {{wicket_enclosure112113}}
> # {{Enclosure}} component is not created again (it is taken from page map??)
> - but this component has id from first request: {{wicket_enclosure1011}}
> # {{Enclosure.getMarkup()}} is called which delegates search to
> {{AssociatedMarkupSourcingStrategy.getMarkup()}} and here on line 117 it
> tries to find markup of enclosure by wrong id.
> # This obviously fails and markup is not found which results in this exception
> {code}
> java.lang.IllegalArgumentException: Argument 'markup' may not be null.
> at org.apache.wicket.util.lang.Args.notNull(Args.java:41)
> ~[wicket-util-7.3.0-SNAPSHOT.jar:7.3.0-SNAPSHOT]
> at org.apache.wicket.markup.MarkupStream.<init>(MarkupStream.java:65)
> ~[wicket-core-7.3.0-SNAPSHOT.jar:7.3.0-SNAPSHOT]
> at
> org.apache.wicket.markup.html.internal.Enclosure.getChild(Enclosure.java:136)
> ~[wicket-core-7.3.0-SNAPSHOT.jar:7.3.0-SNAPSHOT]
> at
> org.apache.wicket.markup.html.internal.Enclosure.onConfigure(Enclosure.java:178)
> ~[wicket-core-7.3.0-SNAPSHOT.jar:7.3.0-SNAPSHOT]
> at org.apache.wicket.Component.configure(Component.java:1055)
> ~[wicket-core-7.3.0-SNAPSHOT.jar:7.3.0-SNAPSHOT]
> at org.apache.wicket.Component.internalBeforeRender(Component.java:940)
> ~[wicket-core-7.3.0-SNAPSHOT.jar:7.3.0-SNAPSHOT]
> at org.apache.wicket.Component.beforeRender(Component.java:1017)
> ~[wicket-core-7.3.0-SNAPSHOT.jar:7.3.0-SNAPSHOT]
> at
> org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1831)
> ~[wicket-core-7.3.0-SNAPSHOT.jar:7.3.0-SNAPSHOT]
> ... 55 common frames omitted
> {code}
> I will try to create a quickstart, but I don't know if I will be able to
> simulate this on simple page. Id of the enclosure is created by
> {{AbstractMarkupFilter.getRequestUniqueId()}} so the only way the id could be
> different is that another components call {{getRequestUniqueId()}} in
> different order each time. (or maybe I'am wrong.. :) )
> *EDIT:*
> Please see the attached quickstart. Steps to reproduce:
> # Start quickstart
> # Go to {{localhost:8888}}
> # Click on Go to page 2
> # Restart the server
> # Hit F5 in the browser
> Note that session persistance is enabled.
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