I am using the DynamicSelectionList (Tap 3) component managed at the
Tassel site http://equalitylearning.org/Tassel/app?service=direct/1/
Search/viewComponent&sp=SmatmshDynamicSelectionList
I followed the BikeMaker demo with source code at http://
lombok.demon.co.uk/tapestryDemo/welcome
The BikeMaker example above uses StringPropertySelectionModel and
String[] objects for the drop-down selection lists. However, I
modified my program to use custom PropertySelectionModel(s) and
custom objects as value objects in the models.
On the first render of the page, the DynamicSelectionList component
works exactly what I want to achieve. The options and their labels
are displayed correctly in the selection lists, and selecting an
option in the parent list reflects the correct items in the child
list. The problem is there is an ArrayIndexOutOfBoundsException while
trying the submit the form. Following the trace and component source
tells me that it is trying to retrieve an object at -1 position. I am
not sure why.
Has anyone encountered this problem before using custom objects for
the DynamicSelectionList component (Tap 3)? I have attached the
source code of the page and also the stack trace. Please let me know
if there's anything you need to figure out this problem. Thanks.
-waimun
/* start of source */
public abstract class AddReferral extends BasePage implements
PageRenderListener {
public abstract UserDepartmentDao getUserDepartmentDao();
public abstract IPropertySelectionModel getDepartmentSelectionModel();
public abstract void setDepartmentSelectionModel(
IPropertySelectionModel selectionModel);
public abstract UserAccountDao getUserAccountDao();
public abstract List getUsersByDepartmentList();
public abstract void setUsersByDepartmentList(List users);
public void pageBeginRender(PageEvent event) {
List allDepartments = getUserDepartmentDao().findAll();
if (getDepartmentSelectionModel() == null) {
setDepartmentSelectionModel(new
DepartmentSelectionModel(
allDepartments));
}
// get users by department from the department selection model.
DepartmentSelectionModel deptModel = (DepartmentSelectionModel)
getDepartmentSelectionModel();
for (Iterator it = deptModel.getDepartmentList().iterator(); it
.hasNext();) {
List usersByDepartment = null;
UserDepartment d = (UserDepartment) it.next();
usersByDepartment =
getUserAccountDao().findByDepartment(d);
getUsersByDepartmentList().add(
new
UsersByDepartmentSelectionModel(usersByDepartment));
}
}
}
/* end of source */
/*
Stack Trace:
* java.util.ArrayList.get(ArrayList.java:323)
*
man.library.components.dynamicSelectionList.DynamicSelectionList.getChil
dModel(DynamicSelectionList.java:309)
*
man.library.components.dynamicSelectionList.DynamicSelectionList.updateV
alue(DynamicSelectionList.java:189)
*
man.library.components.dynamicSelectionList.DynamicSelectionList.renderC
omponent(DynamicSelectionList.java:126)
* org.apache.tapestry.AbstractComponent.render
(AbstractComponent.java:857)
* org.apache.tapestry.AbstractComponent.renderBody
(AbstractComponent.java:624)
* org.apache.tapestry.form.Form.renderComponent(Form.java:362)
* org.apache.tapestry.AbstractComponent.render
(AbstractComponent.java:857)
* org.apache.tapestry.form.Form.rewind(Form.java:568)
* org.apache.tapestry.engine.RequestCycle.rewindForm
(RequestCycle.java:432)
* org.apache.tapestry.form.Form.trigger(Form.java:582)
* org.apache.tapestry.engine.DirectService.service
(DirectService.java:169)
* org.apache.tapestry.engine.AbstractEngine.service
(AbstractEngine.java:889)
* org.apache.tapestry.ApplicationServlet.doService
(ApplicationServlet.java:198)
* org.apache.tapestry.ApplicationServlet.doPost
(ApplicationServlet.java:327)
* javax.servlet.http.HttpServlet.service(HttpServlet.java:154)
* javax.servlet.http.HttpServlet.service(HttpServlet.java:92)
* com.caucho.server.dispatch.ServletFilterChain.doFilter
(ServletFilterChain.java:99)
* com.caucho.server.webapp.WebAppFilterChain.doFilter
(WebAppFilterChain.java:163)
* com.caucho.server.dispatch.ServletInvocation.service
(ServletInvocation.java:208)
* com.caucho.server.http.HttpRequest.handleRequest
(HttpRequest.java:259)
* com.caucho.server.port.TcpConnection.run(TcpConnection.java:363)
* com.caucho.util.ThreadPool.runTasks(ThreadPool.java:490)
* com.caucho.util.ThreadPool.run(ThreadPool.java:423)
* java.lang.Thread.run(Thread.java:613)
*/
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