Wicket trunk build fails?

[Major Péter]

Hi,

I'm trying to build Wicket trunk (mvn -Dmaven.test.skip=true install),
but keep getting the following build error:
org/apache/wicket/markup/html/form/FormComponent.java:[987,39]
incompatible types
found   : java.lang.Object
required: java.lang.Boolean

with JDK1.6.0_18 64bit
Am I doing something wrong, or this code compiles with 1.5 flawlessly?

Thanks,
Peter