org.eclipse.jetty.webapp.WebAppClassLoader Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of jetty-webapp Show documentation
Show all versions of jetty-webapp Show documentation
Jetty web application support
// ========================================================================
// Copyright (c) 1999-2009 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
package org.eclipse.jetty.webapp;
import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.net.URLClassLoader;
import java.security.CodeSource;
import java.security.PermissionCollection;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.List;
import java.util.StringTokenizer;
import org.eclipse.jetty.server.handler.ContextHandler;
import org.eclipse.jetty.util.LazyList;
import org.eclipse.jetty.util.StringUtil;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.resource.Resource;
/* ------------------------------------------------------------ */
/** ClassLoader for HttpContext.
* Specializes URLClassLoader with some utility and file mapping
* methods.
*
* This loader defaults to the 2.3 servlet spec behaviour where non
* system classes are loaded from the classpath in preference to the
* parent loader. Java2 compliant loading, where the parent loader
* always has priority, can be selected with the
* {@link org.eclipse.jetty.server.server.webapp.WebAppContext#setParentLoaderPriority(boolean)}
* method and influenced with {@link WebAppContext#isServerClass(String)} and
* {@link WebAppContext#isSystemClass(String)}.
*
* If no parent class loader is provided, then the current thread
* context classloader will be used. If that is null then the
* classloader that loaded this class is used as the parent.
*
*
*/
public class WebAppClassLoader extends URLClassLoader
{
private String _name;
private WebAppContext _context;
private ClassLoader _parent;
private HashSet _extensions;
/* ------------------------------------------------------------ */
/** Constructor.
*/
public WebAppClassLoader(WebAppContext context)
throws IOException
{
this(null,context);
}
/* ------------------------------------------------------------ */
/** Constructor.
*/
public WebAppClassLoader(ClassLoader parent, WebAppContext context)
throws IOException
{
super(new URL[]{},parent!=null?parent
:(Thread.currentThread().getContextClassLoader()!=null?Thread.currentThread().getContextClassLoader()
:(WebAppClassLoader.class.getClassLoader()!=null?WebAppClassLoader.class.getClassLoader()
:ClassLoader.getSystemClassLoader())));
_parent=getParent();
_context=context;
if (_parent==null)
throw new IllegalArgumentException("no parent classloader!");
_extensions = new HashSet();
_extensions.add(".jar");
_extensions.add(".zip");
String extensions = System.getProperty(WebAppClassLoader.class.getName() + ".extensions");
if(extensions!=null)
{
StringTokenizer tokenizer = new StringTokenizer(extensions, ",;");
while(tokenizer.hasMoreTokens())
_extensions.add(tokenizer.nextToken().trim());
}
if (context.getExtraClasspath()!=null)
addClassPath(context.getExtraClasspath());
}
/* ------------------------------------------------------------ */
/**
* @return the name of the classloader
*/
public String getName()
{
return _name;
}
/* ------------------------------------------------------------ */
/**
* @param name the name of the classloader
*/
public void setName(String name)
{
_name=name;
}
/* ------------------------------------------------------------ */
public ContextHandler getContext()
{
return _context;
}
/* ------------------------------------------------------------ */
/**
* @param classPath Comma or semicolon separated path of filenames or URLs
* pointing to directories or jar files. Directories should end
* with '/'.
*/
public void addClassPath(String classPath)
throws IOException
{
if (classPath == null)
return;
StringTokenizer tokenizer= new StringTokenizer(classPath, ",;");
while (tokenizer.hasMoreTokens())
{
Resource resource= _context.newResource(tokenizer.nextToken());
if (Log.isDebugEnabled())
Log.debug("Path resource=" + resource);
// Resolve file path if possible
File file= resource.getFile();
if (file != null)
{
URL url= resource.getURL();
addURL(url);
}
else
{
// Add resource or expand jar/
if (!resource.isDirectory() && file == null)
{
throw new IllegalArgumentException("!file: "+resource);
}
else
{
URL url= resource.getURL();
addURL(url);
}
}
}
}
/* ------------------------------------------------------------ */
/**
* @param file Checks if this file type can be added to the classpath.
*/
private boolean isFileSupported(String file)
{
int dot = file.lastIndexOf('.');
return dot!=-1 && _extensions.contains(file.substring(dot));
}
/* ------------------------------------------------------------ */
/** Add elements to the class path for the context from the jar and zip files found
* in the specified resource.
* @param lib the resource that contains the jar and/or zip files.
* @param append true if the classpath entries are to be appended to any
* existing classpath, or false if they replace the existing classpath.
* @see #setClassPath(String)
*/
public void addJars(Resource lib)
{
if (lib.exists() && lib.isDirectory())
{
String[] files=lib.list();
for (int f=0;files!=null && f getResources(String name) throws IOException
{
boolean system_class=_context.isSystemClass(name);
boolean server_class=_context.isServerClass(name);
List from_parent = toList(server_class?null:_parent.getResources(name));
List from_webapp = toList((system_class&&!from_parent.isEmpty())?null:this.findResources(name));
if (_context.isParentLoaderPriority())
{
from_parent.addAll(from_webapp);
return Collections.enumeration(from_parent);
}
from_webapp.addAll(from_parent);
return Collections.enumeration(from_webapp);
}
private List toList(Enumeration e)
{
List list = new ArrayList();
while (e!=null && e.hasMoreElements())
list.add(e.nextElement());
return list;
}
/* ------------------------------------------------------------ */
public URL getResource(String name)
{
URL url= null;
boolean tried_parent= false;
boolean system_class=_context.isSystemClass(name);
boolean server_class=_context.isServerClass(name);
if (system_class && server_class)
return null;
if (_parent!=null &&(_context.isParentLoaderPriority() || system_class ) && !server_class)
{
tried_parent= true;
if (_parent!=null)
url= _parent.getResource(name);
}
if (url == null)
{
url= this.findResource(name);
if (url == null && name.startsWith("/"))
{
if (Log.isDebugEnabled())
Log.debug("HACK leading / off " + name);
url= this.findResource(name.substring(1));
}
}
if (url == null && !tried_parent && !server_class )
{
if (_parent!=null)
url= _parent.getResource(name);
}
if (url != null)
if (Log.isDebugEnabled())
Log.debug("getResource("+name+")=" + url);
return url;
}
/* ------------------------------------------------------------ */
@Override
public Class loadClass(String name) throws ClassNotFoundException
{
return loadClass(name, false);
}
/* ------------------------------------------------------------ */
@Override
protected synchronized Class loadClass(String name, boolean resolve) throws ClassNotFoundException
{
Class c= findLoadedClass(name);
ClassNotFoundException ex= null;
boolean tried_parent= false;
boolean system_class=_context.isSystemClass(name);
boolean server_class=_context.isServerClass(name);
if (system_class && server_class)
{
return null;
}
if (c == null && _parent!=null && (_context.isParentLoaderPriority() || system_class) && !server_class)
{
tried_parent= true;
try
{
c= _parent.loadClass(name);
if (Log.isDebugEnabled())
Log.debug("loaded " + c);
}
catch (ClassNotFoundException e)
{
ex= e;
}
}
if (c == null)
{
try
{
c= this.findClass(name);
}
catch (ClassNotFoundException e)
{
ex= e;
}
}
if (c == null && _parent!=null && !tried_parent && !server_class )
c= _parent.loadClass(name);
if (c == null)
throw ex;
if (resolve)
resolveClass(c);
if (Log.isDebugEnabled())
Log.debug("loaded " + c+ " from "+c.getClassLoader());
return c;
}
/* ------------------------------------------------------------ */
public String toString()
{
if (Log.isDebugEnabled())
return "ContextLoader@" + _name + "(" + LazyList.array2List(getURLs()) + ") / " + _parent;
return "ContextLoader@" + _name;
}
}
© 2015 - 2025 Weber Informatics LLC | Privacy Policy