/*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.jasper.runtime;
import javax.servlet.Servlet;
import javax.servlet.ServletContext;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.SingleThreadModel;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.HttpJspPage;
import javax.servlet.jsp.JspFactory;
import java.util.Hashtable;
import java.util.Enumeration;
import java.io.File;
import java.io.PrintWriter;
import java.io.IOException;
import java.io.FileNotFoundException;
import org.apache.jasper.JasperException;
import org.apache.jasper.Constants;
import org.apache.jasper.Options;
import org.apache.jasper.EmbededServletOptions;
import org.apache.jasper.JspCompilationContext;
import org.apache.jasper.JspEngineContext;
import org.apache.jasper.compiler.Compiler;
import org.apache.tomcat.logging.Logger;
/**
* The JSP engine (a.k.a Jasper)!
*
* @author Anil K. Vijendran
* @author Harish Prabandham
*/
public class JspServlet extends HttpServlet {
class JspServletWrapper {
Servlet theServlet;
String jspUri;
boolean isErrorPage;
JspServletWrapper(String jspUri, boolean isErrorPage) {
this.jspUri = jspUri;
this.isErrorPage = isErrorPage;
this.theServlet = null;
}
private void load() throws JasperException, ServletException {
try {
Class servletClass = (Class) loadedJSPs.get(jspUri);
// This is to maintain the original protocol.
destroy();
theServlet = (Servlet) servletClass.newInstance();
} catch (Exception ex) {
throw new JasperException(ex);
}
theServlet.init(JspServlet.this.config);
if (theServlet instanceof HttpJspBase) {
HttpJspBase h = (HttpJspBase) theServlet;
h.setClassLoader(JspServlet.this.parentClassLoader);
}
}
private void loadIfNecessary(HttpServletRequest req, HttpServletResponse res)
throws JasperException, ServletException, FileNotFoundException
{
// First try context attribute; if that fails then use the
// classpath init parameter.
// Should I try to concatenate them if both are non-null?
String cp = (String) context.getAttribute(Constants.SERVLET_CLASSPATH);
String accordingto;
if (cp == null || cp.equals("")) {
accordingto = "according to the init parameter";
cp = options.getClassPath();
} else
accordingto = "according to the Servlet Engine";
Constants.message("jsp.message.cp_is",
new Object[] {
accordingto,
cp == null ? "" : cp
},
Logger.INFORMATION);
if (loadJSP(jspUri, cp, isErrorPage, req, res)
|| theServlet == null) {
load();
}
}
public void service(HttpServletRequest request,
HttpServletResponse response,
boolean precompile)
throws ServletException, IOException, FileNotFoundException
{
try {
loadIfNecessary(request, response);
// If a page is to only to be precompiled return.
if (precompile)
return;
if (theServlet instanceof SingleThreadModel) {
// sync on the wrapper so that the freshness
// of the page is determined right before servicing
synchronized (this) {
theServlet.service(request, response);
}
} else {
theServlet.service(request, response);
}
} catch (FileNotFoundException ex) {
response.sendError(HttpServletResponse.SC_NOT_FOUND,
Constants.getString("jsp.error.file.not.found",
new Object[] {
jspUri
}));
return;
}
}
public void destroy() {
if (theServlet != null)
theServlet.destroy();
}
}
ServletContext context = null;
Hashtable jsps = new Hashtable();
Hashtable loadedJSPs = new Hashtable();
ServletConfig config;
JspLoader loader;
Options options;
ClassLoader parentClassLoader;
ServletEngine engine;
String serverInfo;
static boolean firstTime = true;
public void init(ServletConfig config)
throws ServletException
{
super.init(config);
this.config = config;
this.context = config.getServletContext();
this.serverInfo = context.getServerInfo();
options = new EmbededServletOptions(config, context);
parentClassLoader = (ClassLoader) context.getAttribute(Constants.SERVLET_CLASS_LOADER);
if (parentClassLoader == null)
parentClassLoader = this.getClass().getClassLoader();
// getClass().getClassLoader() returns null in JDK 1.1.6/1.1.8
if (parentClassLoader != null) {
Constants.message("jsp.message.parent_class_loader_is",
new Object[] {
parentClassLoader.toString()
}, Logger.DEBUG);
}
else {
Constants.message("jsp.message.parent_class_loader_is",
new Object[] {
"<none>"
}, Logger.DEBUG);
}
this.loader = new JspLoader(parentClassLoader,
options);
if (firstTime) {
firstTime = false;
Constants.message("jsp.message.scratch.dir.is",
new Object[] {
options.getScratchDir().toString()
}, Logger.INFORMATION );
Constants.message("jsp.message.dont.modify.servlets", Logger.INFORMATION);
}
JspFactory.setDefaultFactory(new JspFactoryImpl());
}
private void serviceJspFile(HttpServletRequest request,
HttpServletResponse response, String jspUri,
Throwable exception, boolean precompile)
throws ServletException, IOException
{
boolean isErrorPage = exception != null;
JspServletWrapper wrapper = (JspServletWrapper) jsps.get(jspUri);
if (wrapper == null) {
wrapper = new JspServletWrapper(jspUri, isErrorPage);
jsps.put(jspUri, wrapper);
}
wrapper.service(request, response, precompile);
}
final void unknownException(HttpServletResponse response,
Throwable t)
{
PrintWriter writer = new PrintWriter(System.err, true);
if (options.getSendErrorToClient()) {
try {
response.setContentType ("text/html");
writer = response.getWriter ();
} catch (IOException ioex) {
writer = new PrintWriter(System.err, true);
}
}
writer.println(Constants.getString("jsp.error.unknownException"));
if (options.getSendErrorToClient()) {
writer.println("<pre>");
}
if (t instanceof JasperException) {
Throwable x = ((JasperException) t).getRootCause();
(x != null ? x : t).printStackTrace (writer);
} else {
t.printStackTrace (writer);
}
if (options.getSendErrorToClient()) {
writer.println("</pre>");
}
if (!options.getSendErrorToClient()) {
try {
String message = t.getMessage ();
if (message == null)
message = "No detailed message";
response.sendError(HttpServletResponse.
SC_INTERNAL_SERVER_ERROR, message);
} catch (IOException ex) {
}
}
}
boolean preCompile(HttpServletRequest request)
throws ServletException
{
boolean precompile = false;
String precom = request.getParameter(Constants.PRECOMPILE);
String qString = request.getQueryString();
if (precom != null) {
if (precom.equals("true"))
precompile = true;
else if (precom.equals("false"))
precompile = false;
else {
// This is illegal.
throw new ServletException("Can't have request parameter " +
" jsp_precomile set to " + precom);
}
}
else if (qString != null && (qString.startsWith(Constants.PRECOMPILE) ||
qString.indexOf("&" + Constants.PRECOMPILE)
!= -1))
precompile = true;
return precompile;
}
public void service (HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException
{
try {
String includeUri
= (String) request.getAttribute(Constants.INC_REQUEST_URI);
String jspUri;
if (includeUri == null)
jspUri = request.getServletPath();
else
jspUri = includeUri;
boolean precompile = preCompile(request);
Logger jasperLog = Constants.jasperLog;
if (jasperLog != null && jasperLog.matchVerbosityLevel(Logger.INFORMATION))
{
jasperLog.log("JspEngine --> "+jspUri);
jasperLog.log("\t ServletPath: "+request.getServletPath());
jasperLog.log("\t PathInfo: "+request.getPathInfo());
jasperLog.log("\t RealPath: "
+getServletConfig().getServletContext().getRealPath(jspUri));
jasperLog.log("\t RequestURI: "+request.getRequestURI());
jasperLog.log("\t QueryString: "+request.getQueryString());
jasperLog.log("\t Request Params: ");
Enumeration e = request.getParameterNames();
while (e.hasMoreElements()) {
String name = (String) e.nextElement();
jasperLog.log("\t\t "+name+" = "+request.getParameter(name));
}
}
serviceJspFile(request, response, jspUri, null, precompile);
} catch (RuntimeException e) {
throw e;
} catch (ServletException e) {
throw e;
} catch (Exception e) {
throw new ServletException(e);
} catch (Throwable t) {
unknownException(response, t);
}
}
public void destroy() {
if (Constants.jasperLog != null)
Constants.jasperLog.log("JspServlet.destroy()", Logger.INFORMATION);
Enumeration servlets = jsps.elements();
while (servlets.hasMoreElements())
((JspServletWrapper) servlets.nextElement()).destroy();
}
/* Check if we need to reload a JSP page.
*
* Side-effect: re-compile the JSP page.
*
* @param classpath explicitly set the JSP compilation path.
* @return true if JSP files is newer
*/
public boolean loadJSP(String name, String classpath,
boolean isErrorPage, HttpServletRequest req, HttpServletResponse res)
throws JasperException, FileNotFoundException
{
Class jspClass = (Class) loadedJSPs.get(name);
boolean firstTime = jspClass == null;
JspCompilationContext ctxt = new JspEngineContext(loader, classpath,
context, name,
isErrorPage, options,
req, res);
boolean outDated = false;
Compiler compiler = ctxt.createCompiler();
try {
outDated = compiler.compile();
if ((jspClass == null) || (compiler.isOutDated())) {
synchronized ( this ) {
if ((jspClass == null) || (compiler.isOutDated() ))
outDated = compiler.compile();
}
}
} catch (FileNotFoundException ex) {
throw ex;
} catch (JasperException ex) {
throw ex;
} catch (Exception ex) {
throw new JasperException(Constants.getString("jsp.error.unable.compile"),
ex);
}
// Reload only if it's outdated
if((jspClass == null) || outDated) {
try {
if( null ==ctxt.getServletClassName() ) {
compiler.computeServletClassName();
}
jspClass = loader.loadClass(ctxt.getFullClassName());
//loadClass(ctxt.getFullClassName(), true);
} catch (ClassNotFoundException cex) {
throw new JasperException(Constants.getString("jsp.error.unable.load"),
cex);
}
loadedJSPs.put(name, jspClass);
}
return outDated;
}
}