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https://issues.apache.org/jira/browse/WICKET-5904?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14545552#comment-14545552
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Guillaume Smet commented on WICKET-5904:
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I still have the issue with the latest snapshots. Working on a quick start.
> NPE after editing a markup file in debug mode
> ---------------------------------------------
>
> Key: WICKET-5904
> URL: https://issues.apache.org/jira/browse/WICKET-5904
> Project: Wicket
> Issue Type: Bug
> Components: wicket
> Affects Versions: 7.0.0-M5
> Reporter: Guillaume Smet
> Assignee: Andrea Del Bene
>
> Hi,
> I have a weird behavior with 7.0.0-SNAPSHOT: if I update the markup in
> Eclipse debug mode (just add a class in a class attribute for instance,
> nothing fancy), I get the following exception when I reload the page without
> removing the ?version parameter:
> java.lang.IllegalArgumentException: Argument 'markup' may not be null.
> at org.apache.wicket.util.lang.Args.notNull(Args.java:41)
> at org.apache.wicket.markup.MarkupStream.<init>(MarkupStream.java:65)
> at
> org.apache.wicket.markup.html.internal.Enclosure.getChild(Enclosure.java:133)
> at
> org.apache.wicket.markup.html.internal.Enclosure.onConfigure(Enclosure.java:148)
> at org.apache.wicket.Component.configure(Component.java:1055)
> at org.apache.wicket.Component.internalBeforeRender(Component.java:940)
> at org.apache.wicket.Component.beforeRender(Component.java:1017)
> at
> org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1712)
> at org.apache.wicket.Component.onBeforeRender(Component.java:3876)
> at org.apache.wicket.Component.internalBeforeRender(Component.java:949)
> at org.apache.wicket.Component.beforeRender(Component.java:1017)
> at
> org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1712)
> at org.apache.wicket.Component.onBeforeRender(Component.java:3876)
> at org.apache.wicket.Page.onBeforeRender(Page.java:801)
> at org.apache.wicket.Component.internalBeforeRender(Component.java:949)
> at org.apache.wicket.Component.beforeRender(Component.java:1017)
> at
> org.apache.wicket.Component.internalPrepareForRender(Component.java:2214)
> at org.apache.wicket.Page.internalPrepareForRender(Page.java:242)
> I can reproduce it every time.
> If the issue isn't obvious, I can try to extract a quick start.
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