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package org.apache.catalina.loader;
import org.apache.catalina.core.StandardServer;
import org.apache.naming.JndiPermission;
import org.glassfish.web.loader.Reloader;
import java.io.File;
import java.io.FilePermission;
import java.io.IOException;
import java.io.InputStream;
import java.net.*;
import java.security.*;
import java.util.*;
import java.util.jar.JarFile;
import java.util.jar.JarInputStream;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Subclass implementation of <b>java.net.URLClassLoader</b> that knows how
* to load classes from disk directories, as well as local and remote JAR
* files. It also implements the <code>Reloader</code> interface, to provide
* automatic reloading support to the associated loader.
* <p>
* In all cases, URLs must conform to the contract specified by
* <code>URLClassLoader</code> - any URL that ends with a "/" character is
* assumed to represent a directory; all other URLs are assumed to be the
* address of a JAR file.
* <p>
* <strong>IMPLEMENTATION NOTE</strong> - Local repositories are searched in
* the order they are added via the initial constructor and/or any subsequent
* calls to <code>addRepository()</code>.
* <p>
* <strong>IMPLEMENTATION NOTE</strong> - At present, there are no dependencies
* from this class to any other Catalina class, so that it could be used
* independently.
*
* @author Craig R. McClanahan
* @author Remy Maucherat
* @version $Revision: 1.3 $ $Date: 2006/03/12 01:27:02 $
*/
public class StandardClassLoader
extends URLClassLoader
implements Reloader {
private static final Logger log = StandardServer.log;
// ----------------------------------------------------------- Constructors
/**
* Construct a new ClassLoader with no defined repositories and no
* parent ClassLoader.
*/
public StandardClassLoader() {
super(new URL[0]);
this.parent = getParent();
this.system = getSystemClassLoader();
securityManager = System.getSecurityManager();
}
/**
* Construct a new ClassLoader with no defined repositories and no
* parent ClassLoader, but with a stream handler factory.
*
* @param factory the URLStreamHandlerFactory to use when creating URLs
*/
public StandardClassLoader(URLStreamHandlerFactory factory) {
super(new URL[0], null, factory);
this.factory = factory;
}
/**
* Construct a new ClassLoader with no defined repositories and the
* specified parent ClassLoader.
*
* @param parent The parent ClassLoader
*/
public StandardClassLoader(ClassLoader parent) {
super((new URL[0]), parent);
this.parent = parent;
this.system = getSystemClassLoader();
securityManager = System.getSecurityManager();
}
/**
* Construct a new ClassLoader with no defined repositories and the
* specified parent ClassLoader.
*
* @param parent The parent ClassLoader
* @param factory the URLStreamHandlerFactory to use when creating URLs
*/
public StandardClassLoader(ClassLoader parent,
URLStreamHandlerFactory factory) {
super((new URL[0]), parent, factory);
this.factory = factory;
}
/**
* Construct a new ClassLoader with the specified repositories and
* no parent ClassLoader.
*
* @param repositories The initial set of repositories
*/
public StandardClassLoader(String repositories[]) {
this(convert(repositories));
}
/**
* Construct a new ClassLoader with the specified repositories and
* parent ClassLoader.
*
* @param repositories The initial set of repositories
* @param parent The parent ClassLoader
*/
public StandardClassLoader(String repositories[], ClassLoader parent) {
this(convert(repositories), parent);
}
/**
* Construct a new ClassLoader with the specified repositories and
* no parent ClassLoader.
*
* @param repositories The initial set of repositories
*/
public StandardClassLoader(URL repositories[]) {
super(repositories);
this.parent = getParent();
this.system = getSystemClassLoader();
securityManager = System.getSecurityManager();
if (repositories != null) {
for (int i = 0; i < repositories.length; i++) {
addRepositoryInternal(repositories[i].toString());
}
}
}
/**
* Construct a new ClassLoader with the specified repositories and
* parent ClassLoader.
*
* @param repositories The initial set of repositories
* @param parent The parent ClassLoader
*/
public StandardClassLoader(URL repositories[], ClassLoader parent) {
super(repositories, parent);
this.parent = parent;
this.system = getSystemClassLoader();
securityManager = System.getSecurityManager();
if (repositories != null) {
for (int i = 0; i < repositories.length; i++) {
addRepositoryInternal(repositories[i].toString());
}
}
}
// ----------------------------------------------------- Instance Variables
/**
* The debugging detail level of this component.
*/
protected int debug = 0;
/**
* Should this class loader delegate to the parent class loader
* <strong>before</strong> searching its own repositories (i.e. the
* usual Java2 delegation model)? If set to <code>false</code>,
* this class loader will search its own repositories first, and
* delegate to the parent only if the class or resource is not
* found locally.
*/
protected boolean delegate = false;
/**
* The list of local repositories, in the order they should be searched
* for locally loaded classes or resources.
*/
protected ArrayList<String> repositories = new ArrayList<String>();
/**
* A list of read File and Jndi Permission's required if this loader
* is for a web application context.
*/
private ArrayList<Permission> permissionList = new ArrayList<Permission>();
/**
* The PermissionCollection for each CodeSource for a web
* application context.
*/
private HashMap<String, PermissionCollection> loaderPC =
new HashMap<String, PermissionCollection>();
/**
* Instance of the SecurityManager installed.
*/
private SecurityManager securityManager = null;
/**
* Flag that the security policy has been refreshed from file.
*/
private boolean policy_refresh = false;
/**
* The parent class loader.
*/
private ClassLoader parent = null;
/**
* The system class loader.
*/
private ClassLoader system = null;
/**
* URL stream handler for additional protocols.
*/
protected URLStreamHandlerFactory factory = null;
// ------------------------------------------------------------- Properties
/**
* Return the debugging detail level for this component.
*/
public int getDebug() {
return (this.debug);
}
/**
* Set the debugging detail level for this component.
*
* @param debug The new debugging detail level
*/
public void setDebug(int debug) {
this.debug = debug;
}
/**
* Return the "delegate first" flag for this class loader.
*/
public boolean getDelegate() {
return (this.delegate);
}
/**
* Set the "delegate first" flag for this class loader.
*
* @param delegate The new "delegate first" flag
*/
public void setDelegate(boolean delegate) {
this.delegate = delegate;
}
/**
* If there is a Java SecurityManager create a read FilePermission
* or JndiPermission for the file directory path.
*
* @param path file directory path
*/
protected void setPermissions(String path) {
if( securityManager != null ) {
if( path.startsWith("jndi:") || path.startsWith("jar:jndi:") ) {
permissionList.add(new JndiPermission(path + "*"));
} else {
permissionList.add(new FilePermission(path + "-","read"));
}
}
}
/**
* If there is a Java SecurityManager add a read FilePermission
* or JndiPermission for URL.
*
* @param url URL for a file or directory on local system
*/
protected void setPermissions(URL url) {
setPermissions(url.toString());
}
// ------------------------------------------------------- Reloader Methods
/**
* Add a new repository to the set of places this ClassLoader can look for
* classes to be loaded.
*
* @param repository Name of a source of classes to be loaded, such as a
* directory pathname, a JAR file pathname, or a ZIP file pathname
*
* @exception IllegalArgumentException if the specified repository is
* invalid or does not exist
*/
public void addRepository(String repository) {
if (debug >= 1)
log("addRepository(" + repository + ")");
// Add this repository to our underlying class loader
try {
URLStreamHandler streamHandler = null;
String protocol = parseProtocol(repository);
if (factory != null)
streamHandler = factory.createURLStreamHandler(protocol);
URL url = new URL(null, repository, streamHandler);
super.addURL(url);
} catch (MalformedURLException e) {
IllegalArgumentException iae = new IllegalArgumentException
("Invalid repository: " + repository);
iae.initCause(e);
throw iae;
}
// Add this repository to our internal list
addRepositoryInternal(repository);
}
/**
* This class loader doesn't check for reloading.
*/
public boolean modified() {
return (false);
}
/**
* Render a String representation of this object.
*/
public String toString() {
StringBuilder sb = new StringBuilder("StandardClassLoader\r\n");
sb.append(" delegate: ");
sb.append(delegate);
sb.append("\r\n");
sb.append(" repositories:\r\n");
Iterator<String> iter = repositories.iterator();
while (iter.hasNext()) {
sb.append(" ");
sb.append(iter.next());
sb.append("\r\n");
}
if (this.parent != null) {
sb.append("----------> Parent Classloader:\r\n");
sb.append(this.parent.toString());
sb.append("\r\n");
}
return (sb.toString());
}
// ---------------------------------------------------- ClassLoader Methods
/**
* Find the specified class in our local repositories, if possible. If
* not found, throw <code>ClassNotFoundException</code>.
*
* @param name Name of the class to be loaded
*
* @exception ClassNotFoundException if the class was not found
*/
public Class findClass(String name) throws ClassNotFoundException {
if (debug >= 3)
log(" findClass(" + name + ")");
// (1) Permission to define this class when using a SecurityManager
if (securityManager != null) {
int i = name.lastIndexOf('.');
if (i >= 0) {
try {
if (debug >= 4)
log(" securityManager.checkPackageDefinition");
securityManager.checkPackageDefinition(name.substring(0,i));
} catch (Exception se) {
if (debug >= 4)
log(" -->Exception-->ClassNotFoundException", se);
throw new ClassNotFoundException(name, se);
}
}
}
// Ask our superclass to locate this class, if possible
// (throws ClassNotFoundException if it is not found)
Class clazz = null;
try {
if (debug >= 4)
log(" super.findClass(" + name + ")");
try {
synchronized (this) {
clazz = findLoadedClass(name);
if (clazz != null)
return clazz;
clazz = super.findClass(name);
}
} catch(AccessControlException ace) {
throw new ClassNotFoundException(name, ace);
} catch (RuntimeException e) {
if (debug >= 4)
log(" -->RuntimeException Rethrown", e);
throw e;
}
if (clazz == null) {
if (debug >= 3)
log(" --> Returning ClassNotFoundException");
throw new ClassNotFoundException(name);
}
} catch (ClassNotFoundException e) {
if (debug >= 3)
log(" --> Passing on ClassNotFoundException", e);
throw e;
}
// Return the class we have located
if (debug >= 4) {
log(" Returning class " + clazz);
log(" Loaded by " + clazz.getClassLoader());
}
return (clazz);
}
/**
* Find the specified resource in our local repository, and return a
* <code>URL</code> refering to it, or <code>null</code> if this resource
* cannot be found.
*
* @param name Name of the resource to be found
*/
public URL findResource(String name) {
if (debug >= 3)
log(" findResource(" + name + ")");
URL url = super.findResource(name);
if (debug >= 3) {
if (url != null)
log(" --> Returning '" + url.toString() + "'");
else
log(" --> Resource not found, returning null");
}
return (url);
}
/**
* Return an enumeration of <code>URLs</code> representing all of the
* resources with the given name. If no resources with this name are
* found, return an empty enumeration.
*
* @param name Name of the resources to be found
*
* @exception IOException if an input/output error occurs
*/
public Enumeration<URL> findResources(String name) throws IOException {
if (debug >= 3)
log(" findResources(" + name + ")");
return (super.findResources(name));
}
/**
* Find the resource with the given name. A resource is some data
* (images, audio, text, etc.) that can be accessed by class code in a
* way that is independent of the location of the code. The name of a
* resource is a "/"-separated path name that identifies the resource.
* If the resource cannot be found, return <code>null</code>.
* <p>
* This method searches according to the following algorithm, returning
* as soon as it finds the appropriate URL. If the resource cannot be
* found, returns <code>null</code>.
* <ul>
* <li>If the <code>delegate</code> property is set to <code>true</code>,
* call the <code>getResource()</code> method of the parent class
* loader, if any.</li>
* <li>Call <code>findResource()</code> to find this resource in our
* locally defined repositories.</li>
* <li>Call the <code>getResource()</code> method of the parent class
* loader, if any.</li>
* </ul>
*
* @param name Name of the resource to return a URL for
*/
public URL getResource(String name) {
if (debug >= 2)
log("getResource(" + name + ")");
URL url = null;
// (1) Delegate to parent if requested
if (delegate) {
if (debug >= 3)
log(" Delegating to parent classloader");
ClassLoader loader = parent;
if (loader == null)
loader = system;
url = loader.getResource(name);
if (url != null) {
if (debug >= 2)
log(" --> Returning '" + url.toString() + "'");
return (url);
}
}
// (2) Search local repositories
if (debug >= 3)
log(" Searching local repositories");
url = findResource(name);
if (url != null) {
if (debug >= 2)
log(" --> Returning '" + url.toString() + "'");
return (url);
}
// (3) Delegate to parent unconditionally if not already attempted
if( !delegate ) {
ClassLoader loader = parent;
if (loader == null)
loader = system;
url = loader.getResource(name);
if (url != null) {
if (debug >= 2)
log(" --> Returning '" + url.toString() + "'");
return (url);
}
}
// (4) Resource was not found
if (debug >= 2)
log(" --> Resource not found, returning null");
return (null);
}
/**
* Find the resource with the given name, and return an input stream
* that can be used for reading it. The search order is as described
* for <code>getResource()</code>, after checking to see if the resource
* data has been previously cached. If the resource cannot be found,
* return <code>null</code>.
*
* @param name Name of the resource to return an input stream for
*/
public InputStream getResourceAsStream(String name) {
if (debug >= 2)
log("getResourceAsStream(" + name + ")");
InputStream stream = null;
// (0) Check for a cached copy of this resource
stream = findLoadedResource(name);
if (stream != null) {
if (debug >= 2)
log(" --> Returning stream from cache");
return (stream);
}
// (1) Delegate to parent if requested
if (delegate) {
if (debug >= 3)
log(" Delegating to parent classloader");
ClassLoader loader = parent;
if (loader == null)
loader = system;
stream = loader.getResourceAsStream(name);
if (stream != null) {
// FIXME - cache???
if (debug >= 2)
log(" --> Returning stream from parent");
return (stream);
}
}
// (2) Search local repositories
if (debug >= 3)
log(" Searching local repositories");
URL url = findResource(name);
if (url != null) {
// FIXME - cache???
if (debug >= 2)
log(" --> Returning stream from local");
try {
return (url.openStream());
} catch (IOException e) {
log("url.openStream(" + url.toString() + ")", e);
return (null);
}
}
// (3) Delegate to parent unconditionally
if (!delegate) {
if (debug >= 3)
log(" Delegating to parent classloader");
ClassLoader loader = parent;
if (loader == null)
loader = system;
stream = loader.getResourceAsStream(name);
if (stream != null) {
// FIXME - cache???
if (debug >= 2)
log(" --> Returning stream from parent");
return (stream);
}
}
// (4) Resource was not found
if (debug >= 2)
log(" --> Resource not found, returning null");
return (null);
}
/**
* Load the class with the specified name. This method searches for
* classes in the same manner as <code>loadClass(String, boolean)</code>
* with <code>false</code> as the second argument.
*
* @param name Name of the class to be loaded
*
* @exception ClassNotFoundException if the class was not found
*/
public Class loadClass(String name) throws ClassNotFoundException {
return (loadClass(name, false));
}
/**
* Load the class with the specified name, searching using the following
* algorithm until it finds and returns the class. If the class cannot
* be found, returns <code>ClassNotFoundException</code>.
* <ul>
* <li>Call <code>findLoadedClass(String)</code> to check if the
* class has already been loaded. If it has, the same
* <code>Class</code> object is returned.</li>
* <li>If the <code>delegate</code> property is set to <code>true</code>,
* call the <code>loadClass()</code> method of the parent class
* loader, if any.</li>
* <li>Call <code>findClass()</code> to find this class in our locally
* defined repositories.</li>
* <li>Call the <code>loadClass()</code> method of our parent
* class loader, if any.</li>
* </ul>
* If the class was found using the above steps, and the
* <code>resolve</code> flag is <code>true</code>, this method will then
* call <code>resolveClass(Class)</code> on the resulting Class object.
*
* @param name Name of the class to be loaded
* @param resolve If <code>true</code> then resolve the class
*
* @exception ClassNotFoundException if the class was not found
*/
public Class loadClass(String name, boolean resolve)
throws ClassNotFoundException {
if (debug >= 2)
log("loadClass(" + name + ", " + resolve + ")");
Class clazz = null;
// (0) Check our previously loaded class cache
clazz = findLoadedClass(name);
if (clazz != null) {
if (debug >= 3)
log(" Returning class from cache");
if (resolve)
resolveClass(clazz);
return (clazz);
}
// If a system class, use system class loader
if( name.startsWith("java.") ) {
ClassLoader loader = system;
clazz = loader.loadClass(name);
if (clazz != null) {
if (resolve)
resolveClass(clazz);
return (clazz);
}
throw new ClassNotFoundException(name);
}
// (.5) Permission to access this class when using a SecurityManager
if (securityManager != null) {
int i = name.lastIndexOf('.');
if (i >= 0) {
try {
securityManager.checkPackageAccess(name.substring(0,i));
} catch (SecurityException se) {
String error = "Security Violation, attempt to use " +
"Restricted Class: " + name;
log(error);
throw new ClassNotFoundException(error, se);
}
}
}
// (1) Delegate to our parent if requested
if (delegate) {
if (debug >= 3)
log(" Delegating to parent classloader");
ClassLoader loader = parent;
if (loader == null)
loader = system;
try {
clazz = loader.loadClass(name);
if (clazz != null) {
if (debug >= 3)
log(" Loading class from parent");
if (resolve)
resolveClass(clazz);
return (clazz);
}
} catch (ClassNotFoundException e) {
;
}
}
// (2) Search local repositories
if (debug >= 3)
log(" Searching local repositories");
try {
clazz = findClass(name);
if (clazz != null) {
if (debug >= 3)
log(" Loading class from local repository");
if (resolve)
resolveClass(clazz);
return (clazz);
}
} catch (ClassNotFoundException e) {
;
}
// (3) Delegate to parent unconditionally
if (!delegate) {
if (debug >= 3)
log(" Delegating to parent classloader");
ClassLoader loader = parent;
if (loader == null)
loader = system;
try {
clazz = loader.loadClass(name);
if (clazz != null) {
if (debug >= 3)
log(" Loading class from parent");
if (resolve)
resolveClass(clazz);
return (clazz);
}
} catch (ClassNotFoundException e) {
;
}
}
// This class was not found
throw new ClassNotFoundException(name);
}
/**
* Get the Permissions for a CodeSource. If this instance
* of StandardClassLoader is for a web application context,
* add read FilePermissions for the base directory (if unpacked),
* the context URL, and jar file resources.
*
* @param codeSource where the code was loaded from
* @return PermissionCollection for CodeSource
*/
protected final PermissionCollection getPermissions(CodeSource codeSource) {
if (!policy_refresh) {
// Refresh the security policies
Policy policy = Policy.getPolicy();
policy.refresh();
policy_refresh = true;
}
String codeUrl = codeSource.getLocation().toString();
PermissionCollection pc;
if ((pc = loaderPC.get(codeUrl)) == null) {
pc = super.getPermissions(codeSource);
if (pc != null) {
Iterator<Permission> perms = permissionList.iterator();
while (perms.hasNext()) {
Permission p = perms.next();
pc.add(p);
}
loaderPC.put(codeUrl,pc);
}
}
return (pc);
}
// ------------------------------------------------------ Protected Methods
/**
* Parse URL protocol.
*
* @return String protocol
*/
protected static String parseProtocol(String spec) {
if (spec == null)
return "";
int pos = spec.indexOf(':');
if (pos <= 0)
return "";
return spec.substring(0, pos).trim();
}
/**
* Add a repository to our internal array only.
*
* @param repository The new repository
*
* @exception IllegalArgumentException if the manifest of a JAR file
* cannot be processed correctly
*/
protected void addRepositoryInternal(String repository) {
URLStreamHandler streamHandler = null;
String protocol = parseProtocol(repository);
if (factory != null)
streamHandler = factory.createURLStreamHandler(protocol);
// Validate the manifest of a JAR file repository
if (!repository.endsWith(File.separator) &&
!repository.endsWith("/")) {
JarFile jarFile = null;
try {
if (repository.startsWith("jar:")) {
URL url = new URL(null, repository, streamHandler);
JarURLConnection conn =
(JarURLConnection) url.openConnection();
conn.setAllowUserInteraction(false);
conn.setDoInput(true);
conn.setDoOutput(false);
conn.connect();
jarFile = conn.getJarFile();
} else if (repository.startsWith("file://")) {
jarFile = new JarFile(repository.substring(7));
} else if (repository.startsWith("file:")) {
jarFile = new JarFile(repository.substring(5));
} else if (repository.endsWith(".jar")) {
URL url = new URL(null, repository, streamHandler);
URLConnection conn = url.openConnection();
JarInputStream jis =
new JarInputStream(conn.getInputStream());
try {
jis.getManifest();
} finally {
try {
jis.close();
} catch(Throwable t) {
}
}
} else {
throw new IllegalArgumentException
("addRepositoryInternal: Invalid URL '" +
repository + "'");
}
} catch (Throwable t) {
IllegalArgumentException iae = new IllegalArgumentException
("addRepositoryInternal");
iae.initCause(t);
throw iae;
} finally {
if (jarFile != null) {
try {
jarFile.close();
} catch (Throwable t) {}
}
}
}
// Add this repository to our internal list
repositories.add(repository);
}
/**
* Convert an array of String to an array of URL and return it.
*
* @param input The array of String to be converted
*/
protected static URL[] convert(String input[]) {
return convert(input, null);
}
/**
* Convert an array of String to an array of URL and return it.
*
* @param input The array of String to be converted
* @param factory Handler factory to use to generate the URLs
*/
protected static URL[] convert(String input[],
URLStreamHandlerFactory factory) {
URLStreamHandler streamHandler = null;
URL url[] = new URL[input.length];
for (int i = 0; i < url.length; i++) {
try {
String protocol = parseProtocol(input[i]);
if (factory != null)
streamHandler = factory.createURLStreamHandler(protocol);
else
streamHandler = null;
url[i] = new URL(null, input[i], streamHandler);
} catch (MalformedURLException e) {
url[i] = null;
}
}
return (url);
}
/**
* Finds the resource with the given name if it has previously been
* loaded and cached by this class loader, and return an input stream
* to the resource data. If this resource has not been cached, return
* <code>null</code>.
*
* @param name Name of the resource to return
*/
protected InputStream findLoadedResource(String name) {
return (null); // FIXME - findLoadedResource()
}
/**
* Log a debugging output message.
*
* @param message Message to be logged
*/
private void log(String message) {
if (log.isLoggable(Level.FINE))
log.log(Level.FINE, "StandardClassLoader: " + message);
}
/**
* Log a debugging output message with an exception.
*
* @param message Message to be logged
* @param throwable Exception to be logged
*/
private void log(String message, Throwable throwable) {
if (log.isLoggable(Level.FINE))
log.log(Level.FINE, "StandardClassLoader: " + message, throwable);
}
}