Working with Wicket 1.2.6. Having trouble with the implementation of
Component toString() - it has been implemented by wicket framework to
use an overloaded 'detailed' version that contains the following:
.append((isRenderAllowed() && isVisible())
The repercussions of this is that where component.toString() is called
from within an overridden instance of component isVisible() method we
get ourselves into a recursive loop. Eventually, this leads to a
java.lang.StackOverflowError with varying results depending on app
server. In IBM Websphere version 6.0.2.2 it actually crashes the server
altogether.
Unfortunately, the wicket framework itself unwittingly corroborates in
this situation arising. A contrived example code and scenario where this
can occur is in wicket.model.AbstractDetachableModel :-
public final Object getObject(final Component component)
{
attach();
try
{
return onGetObject(component);
}
catch (RuntimeException e)
{
throw new WicketRuntimeException("unable to get
object, model: " + this
+ ", called with component " +
component, e);
}
}
Above the WicketRuntimeException message string calls the
component.toString() method. Below is an overridden isVisible()
implementation (from within MyPage component) where a PropertyModel
fails to find the appropriate getXXX for the expression XXX leading to a
WicketRuntimeException in wicket.util.lang.PropertyResolver. For
instance:-
final PropertyModel model = new PropertyModel(this,
"incorrectNameOfListGetMethod");
Panel myPanel = new MyPanel("myPanel") {
public boolean isVisible() {
return
((List)model.getObject(this)).size() > 0;
}
};
Stacktrace of error:-
at
wicket.util.lang.PropertyResolver.findGetter(PropertyResolver.java:374)
at
wicket.util.lang.PropertyResolver.getGetAndSetter(PropertyResolver.java:
233)
at
wicket.util.lang.PropertyResolver.getObjectAndGetSetter(PropertyResolver
.java:200)
at
wicket.util.lang.PropertyResolver.getValue(PropertyResolver.java:88)
at
wicket.model.AbstractPropertyModel.onGetObject(AbstractPropertyModel.jav
a:132)
at
wicket.model.AbstractDetachableModel.getObject(AbstractDetachableModel.j
ava:104)
at com.arcs.spike.page.MyPage$1.isVisible(MyPage.java:29)
Is there some way we can work easily around this sort of issue? Eg. A
hook in the framework etc to create our own versions of components (with
overridden implementaiton of toString() via a factory? Would rather
avoid patching the wicket jar if possible. Thanks in advance for any
help.
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