I'm just getting started with Tacos and I'm trying to get a fairly
simple Tree working, but I've hit an issue I can't solve.
I have the tree rendering and working correctly, and though I haven't
figure out styles yet, it is at least working. But when I went to
configure it to do something server-side when the user clicks an
element in the tree, I get an error message.
The error message is this.
Failure invoking listener method 'public void
net.sf.tacos.ajax.components.tree.Tree.contentExpansion(org.apache.tapestry.IRequestCycle)'
on [EMAIL PROTECTED]/tree]: 0
java.lang.ArrayIndexOutOfBoundsException
0
Stack Trace:
* net.sf.tacos.ajax.components.tree.Tree.expansion(Tree.java:143)
* net.sf.tacos.ajax.components.tree.Tree.contentExpansion(Tree.java:160)
* 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:585)
*
org.apache.tapestry.listener.ListenerMethodInvokerImpl.invokeTargetMethod(ListenerMethodInvokerImpl.java:214)
*
org.apache.tapestry.listener.ListenerMethodInvokerImpl.invokeListenerMethod(ListenerMethodInvokerImpl.java:155)
*
org.apache.tapestry.listener.ListenerMethodInvokerImpl.searchAndInvoke(ListenerMethodInvokerImpl.java:124)
*
org.apache.tapestry.listener.ListenerMethodInvokerImpl.invokeListenerMethod(ListenerMethodInvokerImpl.java:69)
*
org.apache.tapestry.listener.SyntheticListener.actionTriggered(SyntheticListener.java:51)
*
org.apache.tapestry.listener.ListenerInvokerTerminator.invokeListener(ListenerInvokerTerminator.java:51)
*
$ListenerInvoker_10deb79afec.invokeListener($ListenerInvoker_10deb79afec.java)
*
$ListenerInvoker_10deb79afeb.invokeListener($ListenerInvoker_10deb79afeb.java)
* org.apache.tapestry.link.DirectLink.trigger(DirectLink.java:105)
*
net.sf.tacos.ajax.impl.AjaxDirectServiceImpl.triggerComponent(AjaxDirectServiceImpl.java:341)
*
net.sf.tacos.ajax.impl.AjaxDirectServiceImpl.service(AjaxDirectServiceImpl.java:202)
*
$AjaxDirectService_10deb79b03d.service($AjaxDirectService_10deb79b03d.java)
*
org.apache.tapestry.services.impl.EngineServiceInnerProxy.service(EngineServiceInnerProxy.java:77)
*
org.apache.tapestry.services.impl.EngineServiceOuterProxy.service(EngineServiceOuterProxy.java:66)
* org.apache.tapestry.engine.AbstractEngine.service(AbstractEngine.java:248)
*
org.apache.tapestry.services.impl.InvokeEngineTerminator.service(InvokeEngineTerminator.java:60)
*
$WebRequestServicer_10deb79b01f.service($WebRequestServicer_10deb79b01f.java)
*
$WebRequestServicer_10deb79b01b.service($WebRequestServicer_10deb79b01b.java)
*
org.apache.tapestry.services.impl.WebRequestServicerPipelineBridge.service(WebRequestServicerPipelineBridge.java:56)
*
$ServletRequestServicer_10deb79b001.service($ServletRequestServicer_10deb79b001.java)
*
org.apache.tapestry.request.DecodedRequestInjector.service(DecodedRequestInjector.java:55)
*
$ServletRequestServicerFilter_10deb79affd.service($ServletRequestServicerFilter_10deb79affd.java)
*
$ServletRequestServicer_10deb79b003.service($ServletRequestServicer_10deb79b003.java)
*
org.apache.tapestry.multipart.MultipartDecoderFilter.service(MultipartDecoderFilter.java:52)
*
$ServletRequestServicerFilter_10deb79affb.service($ServletRequestServicerFilter_10deb79affb.java)
*
$ServletRequestServicer_10deb79b003.service($ServletRequestServicer_10deb79b003.java)
*
org.apache.tapestry.services.impl.SetupRequestEncoding.service(SetupRequestEncoding.java:53)
*
$ServletRequestServicerFilter_10deb79afff.service($ServletRequestServicerFilter_10deb79afff.java)
*
$ServletRequestServicer_10deb79b003.service($ServletRequestServicer_10deb79b003.java)
*
$ServletRequestServicer_10deb79aff5.service($ServletRequestServicer_10deb79aff5.java)
*
org.apache.tapestry.ApplicationServlet.doService(ApplicationServlet.java:123)
* org.apache.tapestry.ApplicationServlet.doGet(ApplicationServlet.java:79)
* javax.servlet.http.HttpServlet.service(HttpServlet.java:596)
* javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
* org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:427)
*
org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(WebApplicationHandler.java:475)
* org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:567)
* org.mortbay.http.HttpContext.handle(HttpContext.java:1565)
*
org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplicationContext.java:635)
* org.mortbay.http.HttpContext.handle(HttpContext.java:1517)
* org.mortbay.http.HttpServer.service(HttpServer.java:954)
* org.mortbay.http.HttpConnection.service(HttpConnection.java:814)
* org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:981)
* org.mortbay.http.HttpConnection.handle(HttpConnection.java:831)
* org.mortbay.http.SocketListener.handleConnection(SocketListener.java:244)
* org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:357)
* org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:534)
The code is fairly simple and is modeled closely after the examples
from the Tacos demo.
------------------------------------------------------------------------------------------------------
Home.html:
<html>
<head></head>
<script type="text/javascript">
djConfig = { isDebug: false,
baseRelativePath: "js/dojo/",
preventBackButtonFix: false };
</script>
<script type="text/javascript" src="js/dojo/dojo.js"></script>
<body jwcid="@Body" title="Simple Tree">
<div jwcid="tree" id="tree" style="overflow: auto; width: auto; height:
auto;">
<span jwcid="nodeLink">
<span jwcid="@Insert" value="ognl:item.name"/>
</span>
</div>
-----------------------------------------------------------------------------------------------------------------
Home.page:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE page-specification PUBLIC
"-//Apache Software Foundation//Tapestry Specification 4.0//EN"
"http://jakarta.apache.org/tapestry/dtd/Tapestry_4_0.dtd";>
<page-specification class="mytacos.page.HomePage">
<description>Tree Demo</description>
<property name="item" />
<property name="selectedItem" persist="session"/>
<bean name="evenOdd" class="org.apache.tapestry.bean.EvenOdd"/>
<component id="nodeLink" type="tacos:AjaxDirectLink">
<binding name="listener"
value="ognl:components.tree.listeners.contentExpansion"/>
<binding name="updateComponents"
value="ognl:{item.name, 'selectedItem' }"/>
</component>
<component id="tree" type="tacos:Tree">
<binding name="contentProvider" value="new
mytacos.tree.SimpleTreeContentProvider()"/>
<binding name="value" value="item"/>
<binding name="linkListener" value="listener:select"/>
</component>
</page-specification>
-------------------------------------------------------------------------------------------
HomePage.java: (ideally the select() method would execute whenever the
tree is clicked).
package mytacos.page;
import mytacos.tree.Item;
import net.sf.tacos.ajax.AjaxWebRequest;
import org.apache.tapestry.IRequestCycle;
import org.apache.tapestry.html.BasePage;
public abstract class HomePage extends BasePage
{
public abstract Item getSelectedItem();
public abstract void setSelectedItem(Item item);
/** Injected ajax request */
public abstract AjaxWebRequest getAjaxWebRequest();
public void select(IRequestCycle cycle)
{
System.out.println("select");
for(int i=0; i < cycle.getListenerParameters().length; i++)
{
System.out.println(cycle.getListenerParameters()[i]);
}
}
}
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