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JSP2.1 Jasper implementation from Glassfish
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright 1997-2008 Sun Microsystems, Inc. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can obtain
* a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
* or glassfish/bootstrap/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
* Sun designates this particular file as subject to the "Classpath" exception
* as provided by Sun in the GPL Version 2 section of the License file that
* accompanied this code. If applicable, add the following below the License
* Header, with the fields enclosed by brackets [] replaced by your own
* identifying information: "Portions Copyrighted [year]
* [name of copyright owner]"
*
* Contributor(s):
*
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*
*
* This file incorporates work covered by the following copyright and
* permission notice:
*
* Copyright 2004 The Apache Software Foundation
*
* Licensed 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.jasper.servlet;
// START PWC 6300204
import java.io.FileNotFoundException;
// END PWC 6300204
import java.io.IOException;
import java.io.InputStream;
import java.util.Enumeration;
// START GlassFish 750
import java.net.URL;
import java.util.concurrent.ConcurrentHashMap;
// END GlassFish 750
// START SJSWS 6232180
import java.util.HashSet;
import java.util.StringTokenizer;
// END SJSWS 6232180
// START GlassFish 747
import java.util.HashMap;
// END GlassFish 747
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
// START GlassFish 750
import javax.servlet.jsp.tagext.TagLibraryInfo;
// END GlassFish 750
import com.sun.org.apache.commons.logging.Log;
import com.sun.org.apache.commons.logging.LogFactory;
import org.apache.jasper.Constants;
import org.apache.jasper.EmbeddedServletOptions;
import org.apache.jasper.Options;
import org.apache.jasper.compiler.JspRuntimeContext;
import org.apache.jasper.compiler.Localizer;
import org.apache.jasper.runtime.JspApplicationContextImpl;
import org.apache.jasper.runtime.ResourceInjector;
/**
* The JSP engine (a.k.a Jasper).
*
* The servlet container is responsible for providing a
* URLClassLoader for the web application context Jasper
* is being used in. Jasper will try get the Tomcat
* ServletContext attribute for its ServletContext class
* loader, if that fails, it uses the parent class loader.
* In either case, it must be a URLClassLoader.
*
* @author Anil K. Vijendran
* @author Harish Prabandham
* @author Remy Maucherat
* @author Kin-man Chung
* @author Glenn Nielsen
*/
public class JspServlet extends HttpServlet {
// Logger
private static Log log = LogFactory.getLog(JspServlet.class);
private ServletContext context;
private ServletConfig config;
private Options options;
private JspRuntimeContext rctxt;
// START S1AS
// jsp error count
private int countErrors;
private Object errorCountLk = new Object();
// END S1AS
// START SJSWS 6232180
private String httpMethodsString = null;
private HashSet httpMethodsSet = null;
// END SJSWS 6232180
// START GlassFish 750
private ConcurrentHashMap taglibs;
private ConcurrentHashMap tagFileJarUrls;
// END GlassFish 750
/*
* Initializes this JspServlet.
*/
public void init(ServletConfig config) throws ServletException {
super.init(config);
this.config = config;
this.context = config.getServletContext();
// Initialize the JSP Runtime Context
options = new EmbeddedServletOptions(config, context);
rctxt = new JspRuntimeContext(context,options);
// Instantiate and init our resource injector
String resourceInjectorClassName = config.getInitParameter(
Constants.JSP_RESOURCE_INJECTOR_CONTEXT_ATTRIBUTE);
if (resourceInjectorClassName != null) {
try {
ResourceInjector ri = (ResourceInjector)
Class.forName(resourceInjectorClassName).newInstance();
ri.setContext(this.context);
this.context.setAttribute(
Constants.JSP_RESOURCE_INJECTOR_CONTEXT_ATTRIBUTE, ri);
} catch (Exception e) {
throw new ServletException(e);
}
}
// START SJSWS 6232180
// Determine which HTTP methods to service ("*" means all)
httpMethodsString = config.getInitParameter("httpMethods");
if (httpMethodsString != null
&& !httpMethodsString.equals("*")) {
httpMethodsSet = new HashSet();
StringTokenizer tokenizer = new StringTokenizer(
httpMethodsString, ", \t\n\r\f");
while (tokenizer.hasMoreTokens()) {
httpMethodsSet.add(tokenizer.nextToken());
}
}
// END SJSWS 6232180
// START GlassFish 750
taglibs = new ConcurrentHashMap();
context.setAttribute(Constants.JSP_TAGLIBRARY_CACHE, taglibs);
tagFileJarUrls = new ConcurrentHashMap();
context.setAttribute(Constants.JSP_TAGFILE_JAR_URLS_CACHE,
tagFileJarUrls);
// END GlassFish 750
if (log.isTraceEnabled()) {
log.trace(Localizer.getMessage("jsp.message.scratch.dir.is",
options.getScratchDir().toString()));
log.trace(Localizer.getMessage("jsp.message.dont.modify.servlets"));
}
}
/**
* Returns the number of JSPs for which JspServletWrappers exist, i.e.,
* the number of JSPs that have been loaded into the webapp with which
* this JspServlet is associated.
*
* This info may be used for monitoring purposes.
*
* @return The number of JSPs that have been loaded into the webapp with
* which this JspServlet is associated
*/
public int getJspCount() {
return this.rctxt.getJspCount();
}
/**
* Resets the JSP reload counter.
*
* @param count Value to which to reset the JSP reload counter
*/
public void setJspReloadCount(int count) {
this.rctxt.setJspReloadCount(count);
}
/**
* Gets the number of JSPs that have been reloaded.
*
*
This info may be used for monitoring purposes.
*
* @return The number of JSPs (in the webapp with which this JspServlet is
* associated) that have been reloaded
*/
public int getJspReloadCount() {
return this.rctxt.getJspReloadCount();
}
// START S1AS
/**
* Gets the number of errors triggered by JSP invocations.
*
* @return The number of errors triggered by JSP invocations
*/
public int getJspErrorCount() {
return this.countErrors;
}
// END S1AS
/**
*
Look for a precompilation request as described in
* Section 8.4.2 of the JSP 1.2 Specification. WARNING -
* we cannot use request.getParameter() for this, because
* that will trigger parsing all of the request parameters, and not give
* a servlet the opportunity to call
* request.setCharacterEncoding() first.
*
* @param request The servlet requset we are processing
*
* @exception ServletException if an invalid parameter value for the
* jsp_precompile parameter name is specified
*/
boolean preCompile(HttpServletRequest request) throws ServletException {
String queryString = request.getQueryString();
if (queryString == null) {
return (false);
}
int start = queryString.indexOf(Constants.PRECOMPILE);
if (start < 0) {
return (false);
}
queryString =
queryString.substring(start + Constants.PRECOMPILE.length());
if (queryString.length() == 0) {
return (true); // ?jsp_precompile
}
if (queryString.startsWith("&")) {
return (true); // ?jsp_precompile&foo=bar...
}
if (!queryString.startsWith("=")) {
return (false); // part of some other name or value
}
int limit = queryString.length();
int ampersand = queryString.indexOf("&");
if (ampersand > 0) {
limit = ampersand;
}
String value = queryString.substring(1, limit);
if (value.equals("true")) {
return (true); // ?jsp_precompile=true
} else if (value.equals("false")) {
// Spec says if jsp_precompile=false, the request should not
// be delivered to the JSP page; the easiest way to implement
// this is to set the flag to true, and precompile the page anyway.
// This still conforms to the spec, since it says the
// precompilation request can be ignored.
return (true); // ?jsp_precompile=false
} else {
throw new ServletException("Cannot have request parameter " +
Constants.PRECOMPILE + " set to " +
value);
}
}
public void service (HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
// START SJSWS 6232180
if (httpMethodsSet != null) {
String method = request.getMethod();
if (method == null) {
return;
}
boolean isSupportedMethod = httpMethodsSet.contains(method);
if (!isSupportedMethod) {
if (method.equals("OPTIONS")) {
response.addHeader("Allow", httpMethodsString);
} else {
super.service(request, response);
}
return;
}
}
// END SJSWS 6232180
String jspUri = null;
String jspFile = (String) request.getAttribute(Constants.JSP_FILE);
if (jspFile != null) {
// JSP is specified via in declaration
jspUri = jspFile;
request.removeAttribute(Constants.JSP_FILE);
} else {
/*
* Check to see if the requested JSP has been the target of a
* RequestDispatcher.include()
*/
jspUri = (String) request.getAttribute(Constants.INC_SERVLET_PATH);
if (jspUri != null) {
/*
* Requested JSP has been target of
* RequestDispatcher.include(). Its path is assembled from the
* relevant javax.servlet.include.* request attributes
*/
String pathInfo = (String) request.getAttribute(
"javax.servlet.include.path_info");
if (pathInfo != null) {
jspUri += pathInfo;
}
} else {
/*
* Requested JSP has not been the target of a
* RequestDispatcher.include(). Reconstruct its path from the
* request's getServletPath() and getPathInfo()
*/
jspUri = request.getServletPath();
String pathInfo = request.getPathInfo();
if (pathInfo != null) {
jspUri += pathInfo;
}
}
}
if (log.isDebugEnabled()) {
StringBuffer msg = new StringBuffer();
msg.append("JspEngine --> [" + jspUri);
msg.append("] ServletPath: [" + request.getServletPath());
msg.append("] PathInfo: [" + request.getPathInfo());
msg.append("] RealPath: [" + context.getRealPath(jspUri));
msg.append("] RequestURI: [" + request.getRequestURI());
msg.append("] QueryString: [" + request.getQueryString());
msg.append("]");
log.debug(msg);
}
try {
boolean precompile = preCompile(request);
serviceJspFile(request, response, jspUri, null, precompile);
} catch (RuntimeException e) {
// STARTS S1AS
incrementErrorCount();
// END S1AS
throw e;
} catch (ServletException e) {
// STARTS S1AS
incrementErrorCount();
// END S1AS
throw e;
} catch (IOException e) {
// STARTS S1AS
incrementErrorCount();
// END S1AS
throw e;
} catch (Throwable e) {
// STARTS S1AS
incrementErrorCount();
// END S1AS
throw new ServletException(e);
}
}
public void destroy() {
if (log.isDebugEnabled()) {
log.debug("JspServlet.destroy()");
}
rctxt.destroy();
JspApplicationContextImpl.removeJspApplicationContext(context);
// START GlassFish 750
taglibs.clear();
tagFileJarUrls.clear();
// END GlassFish 750
// START GlassFish 747
HashMap tldUriToLocationMap = (HashMap) context.getAttribute(
Constants.JSP_TLD_URI_TO_LOCATION_MAP);
if (tldUriToLocationMap != null) {
tldUriToLocationMap.clear();
}
// END GlassFish 747
}
// -------------------------------------------------------- Private Methods
private void serviceJspFile(HttpServletRequest request,
HttpServletResponse response, String jspUri,
Throwable exception, boolean precompile)
throws ServletException, IOException {
JspServletWrapper wrapper =
(JspServletWrapper) rctxt.getWrapper(jspUri);
if (wrapper == null) {
synchronized(this) {
wrapper = (JspServletWrapper) rctxt.getWrapper(jspUri);
if (wrapper == null) {
// Check if the requested JSP page exists, to avoid
// creating unnecessary directories and files.
/* START PWC 6181923
if (null == context.getResource(jspUri)) {
*/
// START PWC 6181923
if (null == context.getResource(jspUri)
&& !options.getUsePrecompiled()) {
// END PWC 6181923
// START PWC 6300204
String includeRequestUri = (String)
request.getAttribute("javax.servlet.include.request_uri");
if (includeRequestUri != null) {
// Missing JSP resource has been the target of a
// RequestDispatcher.include().
// Throw an exception (rather than returning a
// 404 response error code), because any call to
// response.sendError() must be ignored by the
// servlet engine when issued from within an
// included resource (as per the Servlet spec).
throw new FileNotFoundException(jspUri);
}
// END PWC 6300204
/* RIMOD PWC 6282167, 4878272
response.sendError(HttpServletResponse.SC_NOT_FOUND,
jspUri);
*/
// START PWC 6282167, 4878272
response.sendError(HttpServletResponse.SC_NOT_FOUND);
log.error(Localizer.getMessage(
"jsp.error.file.not.found",
context.getRealPath(jspUri)));
// END PWC 6282167, 4878272
return;
}
boolean isErrorPage = exception != null;
wrapper = new JspServletWrapper(config, options, jspUri,
isErrorPage, rctxt);
rctxt.addWrapper(jspUri,wrapper);
}
}
}
wrapper.service(request, response, precompile);
}
// STARTS S1AS
private void incrementErrorCount() {
synchronized (errorCountLk) {
countErrors++;
}
}
// END S1AS
}