Unusual ClassCastException (SimpleAttributeModifier to IBehaviorListener)
processing onError.
---------------------------------------------------------------------------------------------
Key: WICKET-1483
URL: https://issues.apache.org/jira/browse/WICKET-1483
Project: Wicket
Issue Type: Bug
Components: wicket
Affects Versions: 1.3.2, 1.3.1, 1.3.0-final
Environment: Microsoft Windows XP [Version 5.1.2600] (Server & Client)
Reporter: Miguel Munoz
Priority: Minor
Build the application from the four class files and one html file below. Run
class Start as an application. Go to your browser, to this URL:
http://localhost:4280/behaviorbug/
Type some text into the text field. After six characters, it will throw a
ClassCastException.
Source:
package com.bugs.behaviorBug;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.ajax.form.AjaxFormComponentUpdatingBehavior;
import org.apache.wicket.behavior.SimpleAttributeModifier;
import org.apache.wicket.markup.html.form.TextField;
import org.apache.wicket.model.IModel;
public class BehaviorBug extends TextField {
public BehaviorBug(String id, IModel model) {
super( id, model );
init();
}
private int kc = 0;
private int cc = 0;
private final SimpleAttributeModifier blackBorder = new
SimpleAttributeModifier(
"border-color", "black" );
private final SimpleAttributeModifier redBorder = new SimpleAttributeModifier(
"border-color", "red" );
private SimpleAttributeModifier currentBorder = null;
private void init() {
setBorder( this.blackBorder );
AjaxFormComponentUpdatingBehavior changeWarningBehavior = new
AjaxFormComponentUpdatingBehavior(
"onchange" ) {
@Override
protected void onUpdate(AjaxRequestTarget target) {
System.err.println( "WarningTextField onUpdate onChange "
+ BehaviorBug.this.cc++ );
reColor();
}
};
// I'm trying to do something tricky here. I want it to validate after every
// keystroke, so the user can get instant feedback on when the data is good.
AjaxFormComponentUpdatingBehavior keyUpWarningBehavior = new
AjaxFormComponentUpdatingBehavior(
"onkeyup" ) {
@Override
protected void onUpdate(AjaxRequestTarget target) {
System.err.println( "WarningTextField onUpdate onKeyUp "
+ BehaviorBug.this.kc++ );
reColor();
// Thread.dumpStack();
}
// The implementation of AjaxFormComponentUpdatingBehavior only calls
// onUpdate
// when the field is valid. Since it won't update when the field is
// invalid, I
// can't get my instant feedback unless I call onUpdate() when there's an
// error.
// Since I can't override onEvent() (It's final), I override onError to
// force
// an update even when the field is invalid. This should be safe, since
// onError()
// is only called on invalid data with a null exception, in which case it
// does
// nothing.
// This, however, seems to be what causes the bug. I have no idea why this
// would cause the bug.
@Override
protected void onError(AjaxRequestTarget target, RuntimeException e) {
// Called on validation error with a null e.
super.onError( target, e ); // Throws e, if it's not null. Does nothing
// otherwise.
onUpdate( target );
}
};
add( changeWarningBehavior );
add( keyUpWarningBehavior );
}
private void reColor() {
if ( isValid() ) {
setBorder( BehaviorBug.this.blackBorder );
} else {
setBorder( BehaviorBug.this.redBorder );
}
}
private void setBorder(SimpleAttributeModifier border) {
if ( this.currentBorder != null && this.currentBorder != border ) {
remove( this.currentBorder );
}
this.currentBorder = border;
add( this.currentBorder );
}
}
package com.bugs.behaviorBug;
import org.apache.wicket.Application;
import org.apache.wicket.Page;
import org.apache.wicket.Request;
import org.apache.wicket.Response;
import org.apache.wicket.Session;
import org.apache.wicket.protocol.http.WebApplication;
import org.apache.wicket.protocol.http.WebSession;
/**
*
* @author Miguel Muñoz
* @version $Id$
*
*/
public class BehaviorBugApplication extends WebApplication {
/**
* Constructor
*/
public BehaviorBugApplication() {
// empty
}
@Override
protected void init() {
// empty
}
@Override
public Class<? extends Page> getHomePage() {
return Index.class;
}
/*
* (non-Javadoc)
*
* @see
org.apache.wicket.protocol.http.WebApplication#newSession(org.apache.wicket.Request,
* org.apache.wicket.Response)
*/
@Override
public Session newSession(Request request, Response response) {
return new BugSession( this, request );
}
public class BugSession extends WebSession {
public BugSession(Application application, Request request) {
super(request);
setApplication( application );
}
}
}
package com.bugs.behaviorBug;
import org.apache.wicket.markup.html.WebPage;
import org.apache.wicket.markup.html.form.Form;
import org.apache.wicket.markup.html.form.TextField;
import org.apache.wicket.model.Model;
import org.apache.wicket.validation.IValidator;
import org.apache.wicket.validation.validator.StringValidator;
/**
*
* @author Miguel Muñoz
* @version $Id$
*
*/
public class Index extends WebPage {
/**
*
*/
public Index() {
Form form = new Form("form");
TextField textField = new BehaviorBug("testfield", new Model());
IValidator lengthValidator = new StringValidator.MaximumLengthValidator(4);
textField.add( lengthValidator );
form.add( textField );
add(form);
}
}
package com.bugs.behaviorBug;
import org.mortbay.jetty.Connector;
import org.mortbay.jetty.Server;
import org.mortbay.jetty.nio.SelectChannelConnector;
import org.mortbay.jetty.webapp.WebAppContext;
/**
*
* @author Miguel Muñoz
* @version $Id$
*
*/
public class Start {
private static final int defaultPort = 4280;
/**
*
* @param args
*/
public static void main(String[] args) {
int port = defaultPort;
if (args.length != 0) {
try {
port = Integer.valueOf( args[0] );
} catch ( NumberFormatException e ) {
System.err.println("Unable to parse port parameter \"" + args[0] + "\"
as an integer.");
System.err.println("Using default value of x " + defaultPort);
}
}
Server server = new Server();
SelectChannelConnector connector = new SelectChannelConnector();
connector.setPort( port );
server.setConnectors( new Connector[] { connector } );
WebAppContext web = new WebAppContext();
// web.setContextPath( "/workspace/WicketTutorial" );
web.setContextPath( "/behaviorbug" );
System.out.println( "CP: " + web.getContextPath() );
web.setWar( "src/main/webapp" + port );
server.addHandler( web );
try {
server.start(); // Who was the bozo who declared this to throw Exception?
server.join();
} catch ( Exception e ) {
e.printStackTrace();
System.exit( 1 );
}
}
}
<html>
<head>
<title>Behavior Bug</title>
<link href="style.css" rel="stylesheet" />
</head>
<body>
<div id="container">
<div id="header">Behavior Bug</div>
<div id="content">
Type some text into the field below. After six characters,
you'll get a stack trace.
<form wicket:id="form">
<input type="text" wicket:id="testfield" name="txt"
width="35" size="25" /><p>
submit: <input type="submit" value="That's all,
Folks!"/></p>
</form>
End of form.
</div>
</div>
Test of Build Process.
</body>
</html>
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
