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I have my webapp set up to use JSP's and ZK 3.0.7 as outlined in the SmallTalk Work with Legacy Web Applications, Part II - JSP. Everything has been working fine until I started trying to use a ListModel and ListitemRenderer in one of my Listboxes. I've narrowed down the issue to something with the setting of the model attribute on the Listbox.
Consider the following contents of my JSP, with the ZK portion taken directly from the [a href=http://www.zkoss.org/doc/devguide/ch07s11s11.html"]List Boxes Live Data section of the Developers Guide.
<?xml version="1.0" encoding="ISO-8859-1" ?>
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
<title>ZK ListModel JSP Test</title>
</head>
<body xmlns:zk="http://www.zkoss.org/2005/zul">
<zscript>
String[] data = new String[30];
for (int j=0; j < data.length; ++j) {
data = "option " + j;
}
final org.zkoss.zul.ListModel strset = new org.zkoss.zul.SimpleListModel(data);
</zscript>
<zk:listbox width="200px" rows="10" model="${strset}">
<zk:listhead>
<zk:listheader label="Load on demend"/>
</zk:listhead>
</zk:listbox>
</body>
</html>
The exception I receive when I try to open my page is the following:
[8/22/08 16:24:14:669 CDT] 0000002e WebApp E [Servlet Error]-[/listbox_model_test.jsp]: java.lang.ClassCastException: class java.lang.String cannot be converted to interface org.zkoss.zul.ListModel.
at org.zkoss.lang.Classes.coerce(Classes.java:1287)
at org.zkoss.zk.xel.ExValue.coerce(ExValue.java:116)
at org.zkoss.zk.xel.ExValue.getValue(ExValue.java:111)
at org.zkoss.zk.ui.metainfo.Property.assign(Property.java:161)
at org.zkoss.zk.ui.metainfo.ComponentInfo.applyProperties(ComponentInfo.java:613)
at org.zkoss.zk.ui.impl.AbstractUiFactory.newComponent(AbstractUiFactory.java:95)
at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild0(UiEngineImpl.java:537)
at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:520)
at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:481)
at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate(UiEngineImpl.java:465)
at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild0(UiEngineImpl.java:546)
at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:520)
at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:481)
at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate(UiEngineImpl.java:465)
at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild0(UiEngineImpl.java:546)
at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:520)
at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:481)
at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate(UiEngineImpl.java:465)
at org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage0(UiEngineImpl.java:359)
at org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage(UiEngineImpl.java:292)
at org.zkoss.zk.ui.http.DHtmlLayoutFilter.process(DHtmlLayoutFilter.java:104)
at org.zkoss.zk.ui.http.DHtmlLayoutFilter.doFilter(DHtmlLayoutFilter.java:189)
at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:190)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:130)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain._doFilter(WebAppFilterChain.java:87)
at com.ibm.ws.webcontainer.filter.WebAppFilterManager.doFilter(WebAppFilterManager.java:701)
at com.ibm.ws.webcontainer.filter.WebAppFilterManager.doFilter(WebAppFilterManager.java:646)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:475)
at com.ibm.ws.wswebcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:463)
at com.ibm.wsspi.webcontainer.servlet.GenericServletWrapper.handleRequest(GenericServletWrapper.java:115)
at com.ibm.ws.jsp.webcontainerext.AbstractJSPExtensionServletWrapper.handleRequest(AbstractJSPExtensionServletWrapper.java:168)
at com.ibm.ws.jsp.webcontainerext.AbstractJSPExtensionProcessor.handleRequest(AbstractJSPExtensionProcessor.java:270)
at com.ibm.ws.webcontainer.webapp.WebApp.handleRequest(WebApp.java:3129)
at com.ibm.ws.webcontainer.webapp.WebGroup.handleRequest(WebGroup.java:238)
at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:811)
at com.ibm.ws.wswebcontainer.WebContainer.handleRequest(WebContainer.java:1433)
at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:93)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:465)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewInformation(HttpInboundLink.java:394)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.ready(HttpInboundLink.java:274)
at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.sendToDiscriminators(NewConnectionInitialReadCallback.java:214)
at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.complete(NewConnectionInitialReadCallback.java:113)
at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:152)
at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:213)
at com.ibm.io.async.AbstractAsyncFuture.fireCompletionActions(AbstractAsyncFuture.java:195)
at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:136)
at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:194)
at com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:741)
at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:863)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1510)
Caused by: java.lang.InstantiationException: org.zkoss.zul.ListModel
at java.lang.Class.newInstanceImpl(Native Method)
at java.lang.Class.newInstance(Class.java:1263)
at org.zkoss.lang.Classes.coerce(Classes.java:1285)
... 49 more
I doubt this has anything to do with it, but I did notice that I can't use <zk:zscript>...</zk:zscript> to declare my zscript because it causes an error when accessing the page (but declaring it with <zkscript>...</zkscript> works). I also tried creating a window component that could be used by the page, and then creating the ListModel in there and accessing the ListModel directly from the EL expression in the Listbox tag. I get the same exception when I do that, but the getter method on the window class I created is never called. This leads me to believe that the filter isn't handling the model property of the Listbox tag correctly.
Any pointers or thoughts from anyone?
I just noticed that the code of the JSP is slightly wrong, but even the corrected JSP doesn't work. Use the following JSP contents instead.
<?xml version="1.0" encoding="ISO-8859-1" ?>
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
<title>ZK ListModel JSP Test</title>
</head>
<body xmlns:zk="http://www.zkoss.org/2005/zul">
<zscript>
String[] data = new String[30];
for (int j=0; j < data.length; ++j) {
data = "option " + j;
}
final org.zkoss.zul.ListModel strset = new org.zkoss.zul.SimpleListModel(data);
</zscript>
<zk:listbox width="200px" rows="10" model="${strset}">
<zk:listhead>
<zk:listheader label="Load on demend"/>
</zk:listhead>
</zk:listbox>
</body>
</html>
I've no expierence with JSP/ZK, but i think it should be:
<zk:zscript> instead of <zscript>
and of course </zk:zscript>
/Robert
Try this
<%@ taglib uri="http://www.zkoss.org/2005/zul/jsp" prefix="zk" %> <z:page zscriptLanguage="java">
See also: Docs
/Robert
Asked: 2008-08-22 21:34:58 +0800
Seen: 451 times
Last updated: Aug 25 '08
