[WICKET-1130] Injection of Bound Instance Fails with Exception

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: 1.3.0-beta4
• Component/s: wicket-guice
• Assignee: Igor Vaynberg
• Reporter: Daniel Spiewak
• Created: 05/Nov/07 14:50
• Updated: 03/Jun/16 16:50
• Resolved: 20/Feb/11 20:08

Description

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...