/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.wicket.markup.html.pages;
import java.util.List;
import javax.servlet.http.HttpServletResponse;
import org.apache.wicket.Page;
import org.apache.wicket.WicketRuntimeException;
import org.apache.wicket.markup.MarkupException;
import org.apache.wicket.markup.MarkupStream;
import org.apache.wicket.markup.html.WebMarkupContainer;
import org.apache.wicket.markup.html.basic.Label;
import org.apache.wicket.markup.html.basic.MultiLineLabel;
import org.apache.wicket.markup.html.debug.PageView;
import org.apache.wicket.markup.html.link.Link;
import org.apache.wicket.request.http.WebResponse;
import org.apache.wicket.util.lang.Generics;
/**
* Shows a runtime exception on a nice HTML page.
*
* @author Jonathan Locke
*/
public class ExceptionErrorPage extends AbstractErrorPage
{
private static final long serialVersionUID = 1L;
/** Keep a reference to the root cause. WicketTester will use it */
private final transient Throwable throwable;
/**
* Constructor.
*
* @param throwable
* The exception to show
* @param page
* The page being rendered when the exception was thrown
*/
public ExceptionErrorPage(final Throwable throwable, final Page page)
{
this.throwable = throwable;
// Add exception label
add(new MultiLineLabel("exception", getErrorMessage(throwable)));
add(new MultiLineLabel("stacktrace", getStackTrace(throwable)));
// Get values
String resource = "";
String markup = "";
MarkupStream markupStream = null;
if (throwable instanceof MarkupException)
{
markupStream = ((MarkupException)throwable).getMarkupStream();
if (markupStream != null)
{
markup = markupStream.toHtmlDebugString();
resource = markupStream.getResource().toString();
}
}
// Create markup label
final MultiLineLabel markupLabel = new MultiLineLabel("markup", markup);
markupLabel.setEscapeModelStrings(false);
// Add container with markup highlighted
final WebMarkupContainer markupHighlight = new WebMarkupContainer("markupHighlight");
markupHighlight.add(markupLabel);
markupHighlight.add(new Label("resource", resource));
add(markupHighlight);
// Show container if markup stream is available
markupHighlight.setVisible(markupStream != null);
add(new Link<Void>("displayPageViewLink")
{
private static final long serialVersionUID = 1L;
@Override
public void onClick()
{
ExceptionErrorPage.this.replace(new PageView("componentTree", page));
setVisible(false);
}
});
add(new Label("componentTree", ""));
}
/**
* Converts a Throwable to a string.
*
* @param throwable
* The throwable
* @return The string
*/
public String getErrorMessage(final Throwable throwable)
{
if (throwable != null)
{
StringBuilder sb = new StringBuilder(256);
// first print the last cause
List<Throwable> al = convertToList(throwable);
int length = al.size() - 1;
Throwable cause = al.get(length);
sb.append("Last cause: ").append(cause.getMessage()).append('\n');
if (throwable instanceof WicketRuntimeException)
{
String msg = throwable.getMessage();
if ((msg != null) && (msg.equals(cause.getMessage()) == false))
{
if (throwable instanceof MarkupException)
{
MarkupStream stream = ((MarkupException)throwable).getMarkupStream();
if (stream != null)
{
String text = "\n" + stream.toString();
if (msg.endsWith(text))
{
msg = msg.substring(0, msg.length() - text.length());
}
}
}
sb.append("WicketMessage: ");
sb.append(msg);
sb.append("\n\n");
}
}
return sb.toString();
}
else
{
return "[Unknown]";
}
}
/**
* Converts a Throwable to a string.
*
* @param throwable
* The throwable
* @return The string
*/
public String getStackTrace(final Throwable throwable)
{
if (throwable != null)
{
List<Throwable> al = convertToList(throwable);
StringBuilder sb = new StringBuilder(256);
// first print the last cause
int length = al.size() - 1;
Throwable cause = al.get(length);
sb.append("Root cause:\n\n");
outputThrowable(cause, sb, false);
if (length > 0)
{
sb.append("\n\nComplete stack:\n\n");
for (int i = 0; i < length; i++)
{
outputThrowable(al.get(i), sb, true);
sb.append("\n");
}
}
return sb.toString();
}
else
{
return "<Null Throwable>";
}
}
/**
* @param throwable
* @return xxx
*/
private List<Throwable> convertToList(final Throwable throwable)
{
List<Throwable> al = Generics.newArrayList();
Throwable cause = throwable;
al.add(cause);
while ((cause.getCause() != null) && (cause != cause.getCause()))
{
cause = cause.getCause();
al.add(cause);
}
return al;
}
/**
* Outputs the throwable and its stacktrace to the stringbuffer. If stopAtWicketSerlvet is true
* then the output will stop when the org.apache.wicket servlet is reached. sun.reflect.
* packages are filtered out.
*
* @param cause
* @param sb
* @param stopAtWicketServlet
*/
private void outputThrowable(Throwable cause, StringBuilder sb, boolean stopAtWicketServlet)
{
sb.append(cause);
sb.append("\n");
StackTraceElement[] trace = cause.getStackTrace();
for (int i = 0; i < trace.length; i++)
{
String traceString = trace[i].toString();
if (!(traceString.startsWith("sun.reflect.") && i > 1))
{
sb.append(" at ");
sb.append(traceString);
sb.append("\n");
if (stopAtWicketServlet &&
(traceString.startsWith("org.apache.wicket.protocol.http.WicketServlet") || traceString.startsWith("org.apache.wicket.protocol.http.WicketFilter")))
{
return;
}
}
}
}
@Override
protected void setHeaders(final WebResponse response)
{
response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
}
/**
* Get access to the exception
*
* @return The exception
*/
public Throwable getThrowable()
{
return throwable;
}
}