Hi,
once rendering of components via Ajax has started, you cannot update
components.
AbstractTree#expand() is a convenience method that updates the expanded
branch automatically, hence you get the IllegalStateException.
You should just add all expanded nodes to your tree's model. That's
faster and won't trigger any updates:
tree.getModel().addAll(addNodes);
If you always start with all nodes expanded, you might want to use a
custom set, which inverses its contents. See
org.apache.wicket.examples.tree.FooExpansion for inspiration.
Regards
Sven
On 12/09/2013 06:28 AM, Colin Rogers wrote:
Wicketeers,
I have another hard-to-track down issue.
To make matters worse, I've actually taken this code/pattern, put it into a
quickstart - and what do you know - it works fine...! This means I have no way
to recreate this error in a demonstrable way. Hopefully if I throw this out
there, someone might be able to describe the error and I can then determine
what I'm doing to cause it. Unfortunately google has zero results for;
+"Components can no longer be added" +wicket
Anyway... the exception I'm getting is;
java.lang.IllegalStateException: Components can no longer be added
at
org.apache.wicket.ajax.AbstractAjaxResponse.assertNotFrozen(AbstractAjaxResponse.java:740)
at
org.apache.wicket.ajax.AbstractAjaxResponse.assertComponentsNotFrozen(AbstractAjaxResponse.java:733)
at
org.apache.wicket.ajax.AbstractAjaxResponse.add(AbstractAjaxResponse.java:358)
at
org.apache.wicket.ajax.AjaxRequestHandler.add(AjaxRequestHandler.java:239)
at
org.apache.wicket.ajax.AjaxRequestHandler.add(AjaxRequestHandler.java:232)
at
org.apache.wicket.extensions.markup.html.repeater.tree.TableTree.updateBranch(TableTree.java:178)
at
org.apache.wicket.extensions.markup.html.repeater.tree.AbstractTree.expand(AbstractTree.java:204)
at myapp.TreeUtils.expandNode(TreeUtils.java:25)
at myapp.TreeUtils.expandAll(TreeUtils.java:19)
It is caused when refreshing a table-tree component, that had previous rendered
correctly and had successfully expanded the nodes. This problem happens when
the table-trees parent component is refreshed, in which the table is rebuilt
from new, and replaced the old table. Having debugged the code, it's something
to do with the AjaxRequestHandler that has been retrieved - in that it's
components are 'frozen'. It's odd as I'm in the onConfigure() part of the
lifecycle, and therefore components should be okay to be added - especially as
they are brand new components. Could the AjaxRequestHandler being retrieved be
the wrong one, stale one?
List I said - I can't recreate it in a Quickstart, so there is obviously
something else in the 100k+s of the projects code that is doing something else
to mess it up.
The 'Tree Utils' class looks like this;
public class TreeUtils {
@SuppressWarnings("unchecked")
public static void expandAll( AbstractTree<?> tree ) {
// stupid cast!! Has to happen for use to retrieve the roots,
generically.
AbstractTree<Object> castTree = (AbstractTree<Object>) tree;
Iterator<?> roots = tree.getProvider().getRoots();
while( roots.hasNext() ) {
Object root = roots.next();
expandNode( castTree, root );
}
}
private static void expandNode( AbstractTree<Object> tree, Object node) {
tree.expand(node);
Iterator<?> children = tree.getProvider().getChildren(node);
while( children.hasNext() ) {
Object child = children.next();
expandNode( tree, child );
}
}
}
Any pointers and tips would be greatly appreciated.
Cheers,
Col.
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