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https://issues.apache.org/jira/browse/WICKET-1130?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12635343#action_12635343
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Tuomas Karkkainen commented on WICKET-1130:
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Yes, adding the noarg constructor is a solution. Finding it, based on the
error message thrown is some trouble, especially given it works when the
injection is in an injected child. In our case its a third party class too,
which adds some trouble for us.
I agree the patch is lousy.
> Injection of Bound Instance Fails with Exception
> ------------------------------------------------
>
> Key: WICKET-1130
> URL: https://issues.apache.org/jira/browse/WICKET-1130
> Project: Wicket
> Issue Type: Bug
> Components: wicket-guice
> Affects Versions: 1.3.0-beta4
> Reporter: Daniel Spiewak
> Assignee: Alastair Maw
> Fix For: 1.5-M1
>
>
> If I try to inject an explicitly bound instance into a component, injection
> fails with an exception in the creation of the CGLIB proxy:
> java.lang.IllegalArgumentException: Superclass has no null constructors but
> no arguments were given
> Stupidly, I forgot to save the whole stack trace and the code is now gone
> from my codebase (since I needed it to work). To repeat:
> @Override
> public void configure() {
> bind(EntityManager.class).toInstance(manager);
> }
> Seems wicket-guice is assuming that it needs to create a new instance of
> everything that's injected, and since EntityManager doesn't have a no-args
> constructor, such an action fails. Just an assumption anyway...
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