Sounds like I need to add a better error message, that exception comes from
this line of code:
public TreeManager(Set state, ITreeContentProvider contentProvider,
IKeyProvider keyProvider)
{
if (state == null || contentProvider == null || keyProvider == null) { throw
new IllegalArgumentException(
"Null parameter passed."); }
this.state = state;
this.contentProvider = contentProvider;
this.keyProvider = keyProvider;
}
Which means that one of three things that the tree requires ended up being
null. Either the treeState , IContentProvider, or IKeyProvider parameters
were null. Double check that you are definitely setting all three of these
parameters on the tree. If you have doubts check out the demo source code,
as it has examples of a very very basic tree as well as a rather complicated
tree.
The basic tree setup in the page specification looks like this:
<property name="item" />
<component id="tree" type="tacos:Tree">
<binding name="contentProvider" value="new
net.sf.tacos.demo.tree.SimpleTreeContentProvider()"/>
<binding name="value" value="item"/>
</component>
jesse
On 9/13/05, Vano <[EMAIL PROTECTED]> wrote:
>
> Hello everybody.
>
> After fail of attempt to use contrib:TreeView component, I try to use
> tacos:Tree
> component. Tree nodes which are child for root node (child nodes for
> contentProvider) are displayed, but when I try to expand any of this
> nodes, I'm
> confronted with following exception:
>
> Failure invoking listener method 'public void net.sf.tacos.tree.Tree.
> expansion(org.apache.tapestry.IRequestCycle)' on
> [EMAIL PROTECTED]/
> tree]: Null parameter passed.
>
> More detailed:
>
> java.lang.IllegalArgumentException
> Null parameter passed.
> Stack Trace:
> net.sf.tacos.tree.TreeManager.<init>(TreeManager.java:22)
> net.sf.tacos.tree.Tree.getManager(Tree.java:167)
> net.sf.tacos.tree.Tree.expansion(Tree.java:91)
> sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java
> :39)
> sun.reflect.DelegatingMethodAccessorImpl.invoke
> (DelegatingMethodAccessorImpl.
> java:25)
> java.lang.reflect.Method.invoke(Method.java:324)
> org.apache.tapestry.listener.ListenerMethodInvokerImpl.
> invokeTargetMethod(ListenerMethodInvokerImpl.java:214)
> .............
>
> Can anybody help me to resolve this problem?
>
> Tahks in advance,
> Vano
>
>
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