framework/src/org/apache/click/util/ErrorReport.java - click - Git at Google

 /*
  * 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.click.util;

 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.io.LineNumberReader;
 import java.io.PrintWriter;
 import java.io.StringWriter;
 import java.util.Enumeration;
 import java.util.Locale;
 import java.util.Map;
 import java.util.ResourceBundle;
 import java.util.StringTokenizer;
 import java.util.TreeMap;

 import javax.servlet.ServletContext;
 import javax.servlet.ServletException;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpSession;

 import org.apache.click.Page;
 import org.apache.click.service.TemplateException;
 import org.apache.commons.lang.StringUtils;

 /**
  * Provides an HTML &lt;div&gt; error report for the display of page error
  * information. This class is used by ErrorPage and ClickServlet for the
  * display of error information.
  */
 public class ErrorReport {

     /** The Java language keywords. Used to render Java source code. */
     private static final String[] JAVA_KEYWORDS = { "package", "import",
             "class", "public", "protected", "private", "extends", "implements",
             "return", "if", "while", "for", "do", "else", "try", "new", "void",
             "catch", "throws", "throw", "static", "final", "break", "continue",
             "super", "finally", "true", "false", "true;", "false;", "null",
             "boolean", "int", "char", "long", "float", "double", "short" };

     /** The column number of the error, or -1 if not defined. */
     protected int columnNumber;

     /** The cause of the error. */
     protected final Throwable error;


     /** The line number of the error, or -1 if not defined. */
     protected int lineNumber;

     /** The error is Velocity parsing exception. */
     protected final boolean isParseError;

     /** The application is in "production" mode flag. */
     protected final boolean isProductionMode;

     /** The page class which caused the error. */
     protected final Class<? extends Page> pageClass;

     /** The servlet request. */
     protected final HttpServletRequest request;

     /** The servlet context. */
     protected final ServletContext servletContext;

     /** The name of the error source. */
     protected final String sourceName;

     /** The error source LineNumberReader. */
     protected LineNumberReader sourceReader;

     // Constructor ------------------------------------------------------------

     /**
      * Create a ErrorReport instance from the given error and page.
      *
      * @param error the cause of the error
      * @param pageClass the Page class which caused the error
      * @param isProductionMode the application is in "production" mode
      * @param request the page request
      * @param servletContext the servlet context
      */
     public ErrorReport(Throwable error, Class<? extends Page> pageClass,
             boolean isProductionMode, HttpServletRequest request,
             ServletContext servletContext) {

         this.error = error;
         this.pageClass = pageClass;
         this.isProductionMode = isProductionMode;
         this.request = request;
         this.servletContext = servletContext;

         if (error instanceof TemplateException
             && ((TemplateException) error).isParseError()) {

             TemplateException te = (TemplateException) error;

             if (te.getTemplateName().charAt(0) == '/') {
                 sourceName = te.getTemplateName();
             } else {
                 sourceName =  '/' + te.getTemplateName();
             }
             lineNumber = te.getLineNumber();
             columnNumber = te.getColumnNumber();

             InputStream is =
                 servletContext.getResourceAsStream(sourceName);

             sourceReader = new LineNumberReader(new InputStreamReader(is));
             isParseError = true;

         } else {
             isParseError = false;
             sourceName = null;
             columnNumber = -1;

             StringWriter sw = new StringWriter();
             PrintWriter pw = new PrintWriter(sw);
             getCause().printStackTrace(pw);

             StringTokenizer tokenizer =
                 new StringTokenizer(sw.toString(), "\n");

             try {
                 tokenizer.nextToken();
                 String line = tokenizer.nextToken();
                 if (getCause() instanceof IllegalArgumentException) {
                     line = tokenizer.nextToken();

                     if (line.contains("org.apache.commons.lang.Validate")) {
                         line = tokenizer.nextToken();
                     }
                 }

                 int nameStart = line.indexOf("at ");
                 int nameEnd = line.indexOf("(");
                 nameEnd = line.lastIndexOf(".", nameEnd);
                 if (line.contains("$")) {
                     nameEnd = line.indexOf("$");
                 }

                 if (nameStart != -1 && nameEnd != -1) {
                     String classname = line.substring(nameStart + 3, nameEnd);

                     int lineStart = line.indexOf(":");
                     if (lineStart != -1) {
                         int lineEnd = line.indexOf(")");
                         String lineNumber = line.substring(lineStart + 1, lineEnd);

                         this.lineNumber = Integer.parseInt(lineNumber);

                         String filename =
                             "/" + classname.replace('.', '/') + ".java";

                         sourceReader = getJavaSourceReader(filename);
                     }
                 }

             } catch (Exception e) {
                 e.printStackTrace();
             }
         }
     }

     // Public Methods ---------------------------------------------------------

     /**
      * Return a error report HTML &lt;div&gt; element for the given error and
      * page. The HTML &lt;div&gt; element 'id' and 'class' attribute values are
      * 'errorReport'.
      *
      * @return a error HTML display string
      */
     @SuppressWarnings("unchecked")
     public String toString() {

         if (isProductionMode()) {
             Locale locale = request.getLocale();
             ResourceBundle bundle = ClickUtils.getBundle("click-control", locale);
             return bundle.getString("production-error-message");
         }

         HtmlStringBuffer buffer = new HtmlStringBuffer(10 * 1024);

         Throwable cause = getCause();

         buffer.append("<div id='errorReport' class='errorReport'>\n");

         // Exception table
         buffer.append("<table border='1' cellspacing='1' cellpadding='4' width='100%' style='background-color: white;'>");
         if (isParseError()) {
             buffer.append("<tr><td colspan='2' style='color:white; background-color: navy; font-weight: bold'>Page Parsing Error</td></tr>");
             buffer.append("<tr><td width='12%'><b>Source</b></td><td>");
             buffer.append(getSourceName());
             buffer.append("</td></tr>");
         } else {
             buffer.append("<tr><td colspan='2' style='color:white; background-color: navy; font-weight: bold'>Exception</td></tr>");
             buffer.append("<tr><td width='12%'><b>Class</b></td><td>");
             buffer.append(cause.getClass().getName());
             buffer.append("</td></tr>");
         }
         buffer.append("<tr><td valign='top' width='12%'><b>Message</b></td><td>");
         buffer.append(getMessage());
         buffer.append("</td></tr>");
         if (getSourceReader() != null) {
             buffer.append("<tr><td valign='top' colspan='2'>\n");
             buffer.append(getRenderedSource());
             buffer.append("</td></tr>");
         }
         if (!isParseError()) {
             buffer.append("<tr><td valign='top' colspan='2'>\n");
             buffer.append(getStackTrace());
             buffer.append("</td></tr>");
         }
         buffer.append("</table>");
         buffer.append("<br/>");

         // Page table
         buffer.append("<table border='1' cellspacing='1' cellpadding='4' width='100%' style='background-color: white;'>");
         buffer.append("<tr><td colspan='2' style='color:white; background-color: navy; font-weight: bold'>Page</td></tr>");
         buffer.append("<tr><td width='12%'><b>Classname</b></td><td>");
         if (pageClass != null) {
             buffer.append(pageClass.getName());
         }
         buffer.append("</td></tr>");
         buffer.append("<tr><td width='12%'><b>Path</b></td><td>");
         buffer.append(ClickUtils.getResourcePath(request));
         buffer.append("</td></tr>");
         buffer.append("</table>");
         buffer.append("<br/>");

         // Request table
         buffer.append("<table border='1' cellspacing='1' cellpadding='4' width='100%' style='background-color: white;'>");
         buffer.append("<tr><td colspan='2' style='color:white; background-color: navy; font-weight: bold'>Request</td></tr>");

         Map<String, Object> requestAttributes = new TreeMap<String, Object>();
         Enumeration attributeNames = request.getAttributeNames();
         while (attributeNames.hasMoreElements()) {
             String name = attributeNames.nextElement().toString();
             requestAttributes.put(name, request.getAttribute(name));
         }
         buffer.append("<tr><td width='12%' valign='top'><b>Attributes</b></td><td>");
         writeMap(requestAttributes, buffer);
         buffer.append("</td></tr>");

         buffer.append("<tr><td width='12%'><b>Auth Type</b></td><td>");
         buffer.append(request.getAuthType());
         buffer.append("</td></tr>");

         buffer.append("<tr><td width='12%'><b>Context Path</b></td><td>");
         buffer.append("<a href='");
         buffer.append(request.getContextPath());
         buffer.append("'>");
         buffer.append(request.getContextPath());
         buffer.append("</a>");
         buffer.append("</td></tr>");

         Map<String, Object> requestHeaders = new TreeMap<String, Object>();
         Enumeration headerNames = request.getHeaderNames();
         while (headerNames.hasMoreElements()) {
             String name = headerNames.nextElement().toString();
             requestHeaders.put(name, request.getHeader(name));
         }
         buffer.append("<tr><td width='12%' valign='top'><b>Headers</b></td><td>");
         writeMap(requestHeaders, buffer);
         buffer.append("</td></tr>");

         buffer.append("<tr><td width='12%'><b>Query</b></td><td>");
         String escapedQueryString = ClickUtils.escape(request.getQueryString());
         buffer.append(escapedQueryString);
         buffer.append("</td></tr>");

         buffer.append("<tr><td width='12%'><b>Method</b></td><td>");
         buffer.append(request.getMethod());
         buffer.append("</td></tr>");

         Map<String, Object> requestParams = new TreeMap<String, Object>();
         Enumeration paramNames = request.getParameterNames();
         while (paramNames.hasMoreElements()) {
             String name = paramNames.nextElement().toString();
             requestParams.put(name, request.getParameter(name));
         }
         buffer.append("<tr><td width='12%' valign='top'><b>Parameters</b></td><td>");
         writeMap(requestParams, buffer);
         buffer.append("</td></tr>");

         buffer.append("<tr><td width='12%'><b>Remote User</b></td><td>");
         buffer.append(request.getRemoteUser());
         buffer.append("</td></tr>");

         buffer.append("<tr><td width='12%' valign='top'><b>URI</b></td><td>");
         buffer.append("<a href='");
         String requestURI = ClickUtils.getRequestURI(request);
         buffer.append(requestURI);
         buffer.append("'>");
         buffer.append(requestURI);
         buffer.append("</a>");
         buffer.append("</td></tr>");

         buffer.append("<tr><td><b width='12%'>URL</b></td><td>");
         buffer.append("<a href='");
         buffer.append(request.getRequestURL());
         buffer.append("'>");
         buffer.append(request.getRequestURL());
         buffer.append("</a>");
         buffer.append("</td></tr>");

         Map<String, Object> sessionAttributes = new TreeMap<String, Object>();
         if (request.getSession(false) != null) {
             HttpSession session = request.getSession();
             attributeNames = session.getAttributeNames();
             while (attributeNames.hasMoreElements()) {
                 String name = attributeNames.nextElement().toString();
                 sessionAttributes.put(name, session.getAttribute(name));
             }
         }
         buffer.append("<tr><td width='12%' valign='top'><b>Session</b></td><td>");
         writeMap(sessionAttributes, buffer);
         buffer.append("</td></tr>");
         buffer.append("</table>\n");

         buffer.append("</div>\n");

         return buffer.toString();
     }

     // Protected Methods ------------------------------------------------------

     /**
      * Return the cause of the error.
      *
      * @return the cause of the error
      */
     protected Throwable getCause() {
         Throwable cause = null;
         if (error instanceof ServletException) {
             cause = ((ServletException) error).getRootCause();
             if (cause == null) {
                 cause = error.getCause();
             }
         } else {
             cause = error.getCause();
         }
         if (cause != null && cause.getCause() != null) {
             cause = cause.getCause();
         }
         if (cause == null) {
             cause = error;
         }
         return cause;
     }

     /**
      * Return the error source column number, or -1 if not determined.
      *
      * @return the error source column number, or -1 if not determined
      */
     protected int getColumnNumber() {
         return columnNumber;
     }

     /**
      * Return true if the error was a Velocity parsing exception.
      *
      * @return true if the error was a Velocity parsing exception
      */
     protected boolean isParseError() {
         return isParseError;
     }

     /**
      * Return true if the application is in "production" mode.
      *
      * @return true if the application is in "production" mode
      */
     protected boolean isProductionMode() {
         return isProductionMode;
     }

     /**
      * Return the error source line number, or -1 if not determined.
      *
      * @return the error source line number, or -1 if not determined
      */
     protected int getLineNumber() {
         return lineNumber;
     }

     /**
      * Return the error message.
      *
      * @return the error message
      */
     protected String getMessage() {
         if (isParseError()) {
             String message = error.getMessage();

             String parseMsg = message;
             int startIndex = message.indexOf('\n');
             int endIndex = message.lastIndexOf("...");

             if (startIndex != -1 && endIndex > startIndex) {
                 parseMsg = message.substring(startIndex + 1, endIndex);
             }

             parseMsg = ClickUtils.escapeHtml(parseMsg);

             parseMsg = StringUtils.replace(parseMsg, "...", ", &#160;");

             return parseMsg;

         } else {
             Throwable cause = getCause();

             String value =
                 (cause.getMessage() != null) ? cause.getMessage() : "null";

             return ClickUtils.escapeHtml(value);
         }
     }

     /**
      * Return the error source name.
      *
      * @return the error source name
      */
     protected String getSourceName() {
         return sourceName;
     }

     /**
      * Return a LineNumberReader for the error source file, or null if not
      * defined.
      *
      * @return LineNumberReader for the error source file, or null if not
      *      defined
      */
     protected LineNumberReader getSourceReader() {
         return sourceReader;
     }

     /**
      * Return Java Source LineNumberReader for the given filename, or null if
      * not found.
      *
      * @param filename the name of the Java source file, e.g. /examples/Page.java
      * @return LineNumberReader for the given source filename, or null if
      *      not found
      * @throws FileNotFoundException if file could not be found
      */
     protected LineNumberReader getJavaSourceReader(String filename)
         throws FileNotFoundException {

         if (pageClass == null) {
             return null;
         }

         // Look for source file on classpath
         InputStream is = pageClass.getResourceAsStream(filename);
         if (is != null) {
             return new LineNumberReader(new InputStreamReader(is));
         }

         // Else search for source file under WEB-INF
         String rootPath = servletContext.getRealPath("/");

         String webInfPath = rootPath + File.separator + "WEB-INF";

         File sourceFile = null;

         File webInfDir = new File(webInfPath);
         if (webInfDir.isDirectory() && webInfDir.canRead()) {
             File[] dirList = webInfDir.listFiles();
             if (dirList != null) {
                 for (File file : dirList) {
                     if (file.isDirectory() && file.canRead()) {
                         String sourcePath = file.toString() + filename;
                         sourceFile = new File(sourcePath);
                         if (sourceFile.isFile() && sourceFile.canRead()) {

                             FileInputStream fis = new FileInputStream(sourceFile);
                             return new LineNumberReader(new InputStreamReader(fis));
                         }
                     }
                 }
             }
         }

         return null;
     }

     /**
      * Return a HTML rendered section of the source error with the error
      * line highlighted.
      *
      * @return a HTML rendered section of the parsing error page template
      */
     protected String getRenderedSource() {

         HtmlStringBuffer buffer = new HtmlStringBuffer(5 * 1024);

         buffer.append("<pre style='font-family: Courier New, courier;'>");

         if (sourceReader == null) {
             buffer.append("Source is not available.</span>");
             return buffer.toString();
         }

         final String errorLineStyle =
             "style='background-color:yellow;'";

         final String errorCharSpan =
             "<span style='color:red;text-decoration:underline;font-weight:bold;'>";

         try {
             String line = sourceReader.readLine();

             while (line != null) {
                 if (skipLine()) {
                     line = sourceReader.readLine();
                     continue;
                 }

                 boolean isErrorLine =
                     sourceReader.getLineNumber() == lineNumber;

                 // Start div tag
                 buffer.append("<div ");
                 if (isErrorLine) {
                     buffer.append(errorLineStyle);
                 }
                 buffer.append(">");

                 // Write out line number
                 String lineStr = "" + sourceReader.getLineNumber();
                 int numberSpace = 3 - lineStr.length();
                 for (int i = 0; i < numberSpace; i++) {
                     buffer.append(" ");
                 }
                 if (isErrorLine) {
                     buffer.append("<b>");
                 }
                 buffer.append(sourceReader.getLineNumber());
                 if (isErrorLine) {
                     buffer.append("</b>");
                 }
                 buffer.append(":  ");

                 // Write out line content
                 if (isErrorLine) {
                     if (isParseError()) {
                         HtmlStringBuffer htmlLine =
                             new HtmlStringBuffer(line.length() * 2);

                         for (int i = 0; i < line.length(); i++) {
                             if (i == getColumnNumber() - 1) {
                                 htmlLine.append(errorCharSpan);
                                 htmlLine.append(line.charAt(i));
                                 htmlLine.append("</span>");
                             } else {
                                 htmlLine.append(line.charAt(i));
                             }
                         }
                         buffer.append(htmlLine.toString());

                     } else {
                         buffer.append(getRenderJavaLine(line));
                     }

                 } else {
                     if (isParseError()) {
                         buffer.append(ClickUtils.escapeHtml(line));
                     } else {
                         buffer.append(getRenderJavaLine(line));
                     }
                 }

                 // Close div tag
                 buffer.append("</div>");

                 line = sourceReader.readLine();
             }

         } catch (IOException ioe) {
             buffer.append("Could not load page source: ");
             buffer.append(ClickUtils.escapeHtml(ioe.toString()));
         } finally {
             try {
                 sourceReader.close();
             } catch (IOException ioe) {
                 // do nothing
             }
         }

         buffer.append("</pre>");

         return buffer.toString();
     }

     /**
      * Return a HTML encode stack trace string from the given error.
      *
      * @return a HTML encode stack trace string.
      */
     protected String getStackTrace() {

         StringWriter sw = new StringWriter();
         PrintWriter pw = new PrintWriter(sw);
         getCause().printStackTrace(pw);

         HtmlStringBuffer buffer
             = new HtmlStringBuffer(sw.toString().length() + 80);
         buffer.append("<pre><tt style='font-size:10pt;'>");
         buffer.append(ClickUtils.escapeHtml(sw.toString().trim()));
         buffer.append("</tt></pre>");

         return buffer.toString();
     }

     /**
      * Write out the map name value pairs as name=value lines to the string
      * buffer.
      *
      * @param map the Map of name value pairs
      * @param buffer the string buffer to write out the values to
      */
     protected void writeMap(Map<String, Object> map, HtmlStringBuffer buffer) {
         for (Map.Entry<String, Object> entry : map.entrySet()) {
             String key = entry.getKey();
             Object value = entry.getValue();

             buffer.append(key);
             buffer.append("=");
             if (value != null) {
                 buffer.append(ClickUtils.escapeHtml(value.toString()));
             } else {
                 buffer.append("null");
             }
             buffer.append("<br/>");
         }
         if (map.isEmpty()) {
             buffer.append("&#160;");
         }
     }

     /**
      * Return a HTML rendered Java source line with keywords highlighted
      * using the given line.
      *
      * @param line the Java source line to render
      * @return HTML rendered Java source line
      */
     protected String getRenderJavaLine(String line) {
         line = ClickUtils.escapeHtml(line);

         for (String keyword : JAVA_KEYWORDS) {
             line = renderJavaKeywords(line, keyword);
         }

         return line;
     }

     /**
      * Render the HTML rendered Java source line with the given keyword
      * highlighted.
      *
      * @param line the given Java source line to render
      * @param keyword the Java keyword to highlight
      * @return the HTML rendered Java source line with the given keyword
      *      highlighted
      */
     protected String renderJavaKeywords(String line, String keyword) {
         String markupToken =
             "<span style='color:#7f0055;font-weight:bold;'>" + keyword + "</span>";

         line = StringUtils.replace(line,
                                    " " + keyword + " ",
                                    " " + markupToken + " ");

         if (line.startsWith(keyword)) {
             line = markupToken + line.substring(keyword.length());
         }

         if (line.endsWith(keyword)) {
             line = line.substring(0, line.length() - keyword.length())
                     + markupToken;
         }

         return line;
     }

     /**
      * Return true if the current line read from the source line reader, should
      * be skipped, or false if the current line should be rendered.
      *
      * @return true if the current line from the source reader should be skipped
      */
     protected boolean skipLine() {
         final int currentLine = getSourceReader().getLineNumber();
         final int errorLine = getLineNumber();

         if (Math.abs(currentLine - errorLine) <= 10) {
             return false;
         } else {
             return true;
         }
     }
 }
	/*
	* 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.click.util;

	import java.io.File;
	import java.io.FileInputStream;
	import java.io.FileNotFoundException;
	import java.io.IOException;
	import java.io.InputStream;
	import java.io.InputStreamReader;
	import java.io.LineNumberReader;
	import java.io.PrintWriter;
	import java.io.StringWriter;
	import java.util.Enumeration;
	import java.util.Locale;
	import java.util.Map;
	import java.util.ResourceBundle;
	import java.util.StringTokenizer;
	import java.util.TreeMap;

	import javax.servlet.ServletContext;
	import javax.servlet.ServletException;
	import javax.servlet.http.HttpServletRequest;
	import javax.servlet.http.HttpSession;

	import org.apache.click.Page;
	import org.apache.click.service.TemplateException;
	import org.apache.commons.lang.StringUtils;

	/**
	* Provides an HTML <div> error report for the display of page error
	* information. This class is used by ErrorPage and ClickServlet for the
	* display of error information.
	*/
	public class ErrorReport {

	/** The Java language keywords. Used to render Java source code. */
	private static final String[] JAVA_KEYWORDS = { "package", "import",
	"class", "public", "protected", "private", "extends", "implements",
	"return", "if", "while", "for", "do", "else", "try", "new", "void",
	"catch", "throws", "throw", "static", "final", "break", "continue",
	"super", "finally", "true", "false", "true;", "false;", "null",
	"boolean", "int", "char", "long", "float", "double", "short" };

	/** The column number of the error, or -1 if not defined. */
	protected int columnNumber;

	/** The cause of the error. */
	protected final Throwable error;


	/** The line number of the error, or -1 if not defined. */
	protected int lineNumber;

	/** The error is Velocity parsing exception. */
	protected final boolean isParseError;

	/** The application is in "production" mode flag. */
	protected final boolean isProductionMode;

	/** The page class which caused the error. */
	protected final Class<? extends Page> pageClass;

	/** The servlet request. */
	protected final HttpServletRequest request;

	/** The servlet context. */
	protected final ServletContext servletContext;

	/** The name of the error source. */
	protected final String sourceName;

	/** The error source LineNumberReader. */
	protected LineNumberReader sourceReader;

	// Constructor ------------------------------------------------------------

	/**
	* Create a ErrorReport instance from the given error and page.
	*
	* @param error the cause of the error
	* @param pageClass the Page class which caused the error
	* @param isProductionMode the application is in "production" mode
	* @param request the page request
	* @param servletContext the servlet context
	*/
	public ErrorReport(Throwable error, Class<? extends Page> pageClass,
	boolean isProductionMode, HttpServletRequest request,
	ServletContext servletContext) {

	this.error = error;
	this.pageClass = pageClass;
	this.isProductionMode = isProductionMode;
	this.request = request;
	this.servletContext = servletContext;

	if (error instanceof TemplateException
	&& ((TemplateException) error).isParseError()) {

	TemplateException te = (TemplateException) error;

	if (te.getTemplateName().charAt(0) == '/') {
	sourceName = te.getTemplateName();
	} else {
	sourceName = '/' + te.getTemplateName();
	}
	lineNumber = te.getLineNumber();
	columnNumber = te.getColumnNumber();

	InputStream is =
	servletContext.getResourceAsStream(sourceName);

	sourceReader = new LineNumberReader(new InputStreamReader(is));
	isParseError = true;

	} else {
	isParseError = false;
	sourceName = null;
	columnNumber = -1;

	StringWriter sw = new StringWriter();
	PrintWriter pw = new PrintWriter(sw);
	getCause().printStackTrace(pw);

	StringTokenizer tokenizer =
	new StringTokenizer(sw.toString(), "\n");

	try {
	tokenizer.nextToken();
	String line = tokenizer.nextToken();
	if (getCause() instanceof IllegalArgumentException) {
	line = tokenizer.nextToken();

	if (line.contains("org.apache.commons.lang.Validate")) {
	line = tokenizer.nextToken();
	}
	}

	int nameStart = line.indexOf("at ");
	int nameEnd = line.indexOf("(");
	nameEnd = line.lastIndexOf(".", nameEnd);
	if (line.contains("$")) {
	nameEnd = line.indexOf("$");
	}

	if (nameStart != -1 && nameEnd != -1) {
	String classname = line.substring(nameStart + 3, nameEnd);

	int lineStart = line.indexOf(":");
	if (lineStart != -1) {
	int lineEnd = line.indexOf(")");
	String lineNumber = line.substring(lineStart + 1, lineEnd);

	this.lineNumber = Integer.parseInt(lineNumber);

	String filename =
	"/" + classname.replace('.', '/') + ".java";

	sourceReader = getJavaSourceReader(filename);
	}
	}

	} catch (Exception e) {
	e.printStackTrace();
	}
	}
	}

	// Public Methods ---------------------------------------------------------

	/**
	* Return a error report HTML <div> element for the given error and
	* page. The HTML <div> element 'id' and 'class' attribute values are
	* 'errorReport'.
	*
	* @return a error HTML display string
	*/
	@SuppressWarnings("unchecked")
	public String toString() {

	if (isProductionMode()) {
	Locale locale = request.getLocale();
	ResourceBundle bundle = ClickUtils.getBundle("click-control", locale);
	return bundle.getString("production-error-message");
	}

	HtmlStringBuffer buffer = new HtmlStringBuffer(10 * 1024);

	Throwable cause = getCause();

	buffer.append("<div id='errorReport' class='errorReport'>\n");

	// Exception table
	buffer.append("<table border='1' cellspacing='1' cellpadding='4' width='100%' style='background-color: white;'>");
	if (isParseError()) {
	buffer.append("<tr><td colspan='2' style='color:white; background-color: navy; font-weight: bold'>Page Parsing Error</td></tr>");
	buffer.append("<tr><td width='12%'><b>Source</b></td><td>");
	buffer.append(getSourceName());
	buffer.append("</td></tr>");
	} else {
	buffer.append("<tr><td colspan='2' style='color:white; background-color: navy; font-weight: bold'>Exception</td></tr>");
	buffer.append("<tr><td width='12%'><b>Class</b></td><td>");
	buffer.append(cause.getClass().getName());
	buffer.append("</td></tr>");
	}
	buffer.append("<tr><td valign='top' width='12%'><b>Message</b></td><td>");
	buffer.append(getMessage());
	buffer.append("</td></tr>");
	if (getSourceReader() != null) {
	buffer.append("<tr><td valign='top' colspan='2'>\n");
	buffer.append(getRenderedSource());
	buffer.append("</td></tr>");
	}
	if (!isParseError()) {
	buffer.append("<tr><td valign='top' colspan='2'>\n");
	buffer.append(getStackTrace());
	buffer.append("</td></tr>");
	}
	buffer.append("</table>");
	buffer.append("<br/>");

	// Page table
	buffer.append("<table border='1' cellspacing='1' cellpadding='4' width='100%' style='background-color: white;'>");
	buffer.append("<tr><td colspan='2' style='color:white; background-color: navy; font-weight: bold'>Page</td></tr>");
	buffer.append("<tr><td width='12%'><b>Classname</b></td><td>");
	if (pageClass != null) {
	buffer.append(pageClass.getName());
	}
	buffer.append("</td></tr>");
	buffer.append("<tr><td width='12%'><b>Path</b></td><td>");
	buffer.append(ClickUtils.getResourcePath(request));
	buffer.append("</td></tr>");
	buffer.append("</table>");
	buffer.append("<br/>");

	// Request table
	buffer.append("<table border='1' cellspacing='1' cellpadding='4' width='100%' style='background-color: white;'>");
	buffer.append("<tr><td colspan='2' style='color:white; background-color: navy; font-weight: bold'>Request</td></tr>");

	Map<String, Object> requestAttributes = new TreeMap<String, Object>();
	Enumeration attributeNames = request.getAttributeNames();
	while (attributeNames.hasMoreElements()) {
	String name = attributeNames.nextElement().toString();
	requestAttributes.put(name, request.getAttribute(name));
	}
	buffer.append("<tr><td width='12%' valign='top'><b>Attributes</b></td><td>");
	writeMap(requestAttributes, buffer);
	buffer.append("</td></tr>");

	buffer.append("<tr><td width='12%'><b>Auth Type</b></td><td>");
	buffer.append(request.getAuthType());
	buffer.append("</td></tr>");

	buffer.append("<tr><td width='12%'><b>Context Path</b></td><td>");
	buffer.append("<a href='");
	buffer.append(request.getContextPath());
	buffer.append("'>");
	buffer.append(request.getContextPath());
	buffer.append("</a>");
	buffer.append("</td></tr>");

	Map<String, Object> requestHeaders = new TreeMap<String, Object>();
	Enumeration headerNames = request.getHeaderNames();
	while (headerNames.hasMoreElements()) {
	String name = headerNames.nextElement().toString();
	requestHeaders.put(name, request.getHeader(name));
	}
	buffer.append("<tr><td width='12%' valign='top'><b>Headers</b></td><td>");
	writeMap(requestHeaders, buffer);
	buffer.append("</td></tr>");

	buffer.append("<tr><td width='12%'><b>Query</b></td><td>");
	String escapedQueryString = ClickUtils.escape(request.getQueryString());
	buffer.append(escapedQueryString);
	buffer.append("</td></tr>");

	buffer.append("<tr><td width='12%'><b>Method</b></td><td>");
	buffer.append(request.getMethod());
	buffer.append("</td></tr>");

	Map<String, Object> requestParams = new TreeMap<String, Object>();
	Enumeration paramNames = request.getParameterNames();
	while (paramNames.hasMoreElements()) {
	String name = paramNames.nextElement().toString();
	requestParams.put(name, request.getParameter(name));
	}
	buffer.append("<tr><td width='12%' valign='top'><b>Parameters</b></td><td>");
	writeMap(requestParams, buffer);
	buffer.append("</td></tr>");

	buffer.append("<tr><td width='12%'><b>Remote User</b></td><td>");
	buffer.append(request.getRemoteUser());
	buffer.append("</td></tr>");

	buffer.append("<tr><td width='12%' valign='top'><b>URI</b></td><td>");
	buffer.append("<a href='");
	String requestURI = ClickUtils.getRequestURI(request);
	buffer.append(requestURI);
	buffer.append("'>");
	buffer.append(requestURI);
	buffer.append("</a>");
	buffer.append("</td></tr>");

	buffer.append("<tr><td><b width='12%'>URL</b></td><td>");
	buffer.append("<a href='");
	buffer.append(request.getRequestURL());
	buffer.append("'>");
	buffer.append(request.getRequestURL());
	buffer.append("</a>");
	buffer.append("</td></tr>");

	Map<String, Object> sessionAttributes = new TreeMap<String, Object>();
	if (request.getSession(false) != null) {
	HttpSession session = request.getSession();
	attributeNames = session.getAttributeNames();
	while (attributeNames.hasMoreElements()) {
	String name = attributeNames.nextElement().toString();
	sessionAttributes.put(name, session.getAttribute(name));
	}
	}
	buffer.append("<tr><td width='12%' valign='top'><b>Session</b></td><td>");
	writeMap(sessionAttributes, buffer);
	buffer.append("</td></tr>");
	buffer.append("</table>\n");

	buffer.append("</div>\n");

	return buffer.toString();
	}

	// Protected Methods ------------------------------------------------------

	/**
	* Return the cause of the error.
	*
	* @return the cause of the error
	*/
	protected Throwable getCause() {
	Throwable cause = null;
	if (error instanceof ServletException) {
	cause = ((ServletException) error).getRootCause();
	if (cause == null) {
	cause = error.getCause();
	}
	} else {
	cause = error.getCause();
	}
	if (cause != null && cause.getCause() != null) {
	cause = cause.getCause();
	}
	if (cause == null) {
	cause = error;
	}
	return cause;
	}

	/**
	* Return the error source column number, or -1 if not determined.
	*
	* @return the error source column number, or -1 if not determined
	*/
	protected int getColumnNumber() {
	return columnNumber;
	}

	/**
	* Return true if the error was a Velocity parsing exception.
	*
	* @return true if the error was a Velocity parsing exception
	*/
	protected boolean isParseError() {
	return isParseError;
	}

	/**
	* Return true if the application is in "production" mode.
	*
	* @return true if the application is in "production" mode
	*/
	protected boolean isProductionMode() {
	return isProductionMode;
	}

	/**
	* Return the error source line number, or -1 if not determined.
	*
	* @return the error source line number, or -1 if not determined
	*/
	protected int getLineNumber() {
	return lineNumber;
	}

	/**
	* Return the error message.
	*
	* @return the error message
	*/
	protected String getMessage() {
	if (isParseError()) {
	String message = error.getMessage();

	String parseMsg = message;
	int startIndex = message.indexOf('\n');
	int endIndex = message.lastIndexOf("...");

	if (startIndex != -1 && endIndex > startIndex) {
	parseMsg = message.substring(startIndex + 1, endIndex);
	}

	parseMsg = ClickUtils.escapeHtml(parseMsg);

	parseMsg = StringUtils.replace(parseMsg, "...", ",  ");

	return parseMsg;

	} else {
	Throwable cause = getCause();

	String value =
	(cause.getMessage() != null) ? cause.getMessage() : "null";

	return ClickUtils.escapeHtml(value);
	}
	}

	/**
	* Return the error source name.
	*
	* @return the error source name
	*/
	protected String getSourceName() {
	return sourceName;
	}

	/**
	* Return a LineNumberReader for the error source file, or null if not
	* defined.
	*
	* @return LineNumberReader for the error source file, or null if not
	* defined
	*/
	protected LineNumberReader getSourceReader() {
	return sourceReader;
	}

	/**
	* Return Java Source LineNumberReader for the given filename, or null if
	* not found.
	*
	* @param filename the name of the Java source file, e.g. /examples/Page.java
	* @return LineNumberReader for the given source filename, or null if
	* not found
	* @throws FileNotFoundException if file could not be found
	*/
	protected LineNumberReader getJavaSourceReader(String filename)
	throws FileNotFoundException {

	if (pageClass == null) {
	return null;
	}

	// Look for source file on classpath
	InputStream is = pageClass.getResourceAsStream(filename);
	if (is != null) {
	return new LineNumberReader(new InputStreamReader(is));
	}

	// Else search for source file under WEB-INF
	String rootPath = servletContext.getRealPath("/");

	String webInfPath = rootPath + File.separator + "WEB-INF";

	File sourceFile = null;

	File webInfDir = new File(webInfPath);
	if (webInfDir.isDirectory() && webInfDir.canRead()) {
	File[] dirList = webInfDir.listFiles();
	if (dirList != null) {
	for (File file : dirList) {
	if (file.isDirectory() && file.canRead()) {
	String sourcePath = file.toString() + filename;
	sourceFile = new File(sourcePath);
	if (sourceFile.isFile() && sourceFile.canRead()) {

	FileInputStream fis = new FileInputStream(sourceFile);
	return new LineNumberReader(new InputStreamReader(fis));
	}
	}
	}
	}
	}

	return null;
	}

	/**
	* Return a HTML rendered section of the source error with the error
	* line highlighted.
	*
	* @return a HTML rendered section of the parsing error page template
	*/
	protected String getRenderedSource() {

	HtmlStringBuffer buffer = new HtmlStringBuffer(5 * 1024);

	buffer.append("<pre style='font-family: Courier New, courier;'>");

	if (sourceReader == null) {
	buffer.append("Source is not available.</span>");
	return buffer.toString();
	}

	final String errorLineStyle =
	"style='background-color:yellow;'";

	final String errorCharSpan =
	"<span style='color:red;text-decoration:underline;font-weight:bold;'>";

	try {
	String line = sourceReader.readLine();

	while (line != null) {
	if (skipLine()) {
	line = sourceReader.readLine();
	continue;
	}

	boolean isErrorLine =
	sourceReader.getLineNumber() == lineNumber;

	// Start div tag
	buffer.append("<div ");
	if (isErrorLine) {
	buffer.append(errorLineStyle);
	}
	buffer.append(">");

	// Write out line number
	String lineStr = "" + sourceReader.getLineNumber();
	int numberSpace = 3 - lineStr.length();
	for (int i = 0; i < numberSpace; i++) {
	buffer.append(" ");
	}
	if (isErrorLine) {
	buffer.append("<b>");
	}
	buffer.append(sourceReader.getLineNumber());
	if (isErrorLine) {
	buffer.append("</b>");
	}
	buffer.append(": ");

	// Write out line content
	if (isErrorLine) {
	if (isParseError()) {
	HtmlStringBuffer htmlLine =
	new HtmlStringBuffer(line.length() * 2);

	for (int i = 0; i < line.length(); i++) {
	if (i == getColumnNumber() - 1) {
	htmlLine.append(errorCharSpan);
	htmlLine.append(line.charAt(i));
	htmlLine.append("</span>");
	} else {
	htmlLine.append(line.charAt(i));
	}
	}
	buffer.append(htmlLine.toString());

	} else {
	buffer.append(getRenderJavaLine(line));
	}

	} else {
	if (isParseError()) {
	buffer.append(ClickUtils.escapeHtml(line));
	} else {
	buffer.append(getRenderJavaLine(line));
	}
	}

	// Close div tag
	buffer.append("</div>");

	line = sourceReader.readLine();
	}

	} catch (IOException ioe) {
	buffer.append("Could not load page source: ");
	buffer.append(ClickUtils.escapeHtml(ioe.toString()));
	} finally {
	try {
	sourceReader.close();
	} catch (IOException ioe) {
	// do nothing
	}
	}

	buffer.append("</pre>");

	return buffer.toString();
	}

	/**
	* Return a HTML encode stack trace string from the given error.
	*
	* @return a HTML encode stack trace string.
	*/
	protected String getStackTrace() {

	StringWriter sw = new StringWriter();
	PrintWriter pw = new PrintWriter(sw);
	getCause().printStackTrace(pw);

	HtmlStringBuffer buffer
	= new HtmlStringBuffer(sw.toString().length() + 80);
	buffer.append("<pre><tt style='font-size:10pt;'>");
	buffer.append(ClickUtils.escapeHtml(sw.toString().trim()));
	buffer.append("</tt></pre>");

	return buffer.toString();
	}

	/**
	* Write out the map name value pairs as name=value lines to the string
	* buffer.
	*
	* @param map the Map of name value pairs
	* @param buffer the string buffer to write out the values to
	*/
	protected void writeMap(Map<String, Object> map, HtmlStringBuffer buffer) {
	for (Map.Entry<String, Object> entry : map.entrySet()) {
	String key = entry.getKey();
	Object value = entry.getValue();

	buffer.append(key);
	buffer.append("=");
	if (value != null) {
	buffer.append(ClickUtils.escapeHtml(value.toString()));
	} else {
	buffer.append("null");
	}
	buffer.append("<br/>");
	}
	if (map.isEmpty()) {
	buffer.append(" ");
	}
	}

	/**
	* Return a HTML rendered Java source line with keywords highlighted
	* using the given line.
	*
	* @param line the Java source line to render
	* @return HTML rendered Java source line
	*/
	protected String getRenderJavaLine(String line) {
	line = ClickUtils.escapeHtml(line);

	for (String keyword : JAVA_KEYWORDS) {
	line = renderJavaKeywords(line, keyword);
	}

	return line;
	}

	/**
	* Render the HTML rendered Java source line with the given keyword
	* highlighted.
	*
	* @param line the given Java source line to render
	* @param keyword the Java keyword to highlight
	* @return the HTML rendered Java source line with the given keyword
	* highlighted
	*/
	protected String renderJavaKeywords(String line, String keyword) {
	String markupToken =
	"<span style='color:#7f0055;font-weight:bold;'>" + keyword + "</span>";

	line = StringUtils.replace(line,
	" " + keyword + " ",
	" " + markupToken + " ");

	if (line.startsWith(keyword)) {
	line = markupToken + line.substring(keyword.length());
	}

	if (line.endsWith(keyword)) {
	line = line.substring(0, line.length() - keyword.length())
	+ markupToken;
	}

	return line;
	}

	/**
	* Return true if the current line read from the source line reader, should
	* be skipped, or false if the current line should be rendered.
	*
	* @return true if the current line from the source reader should be skipped
	*/
	protected boolean skipLine() {
	final int currentLine = getSourceReader().getLineNumber();
	final int errorLine = getLineNumber();

	if (Math.abs(currentLine - errorLine) <= 10) {
	return false;
	} else {
	return true;
	}
	}
	}