org.apache.catalina.loader
Class WebappClassLoader

java.lang.Object
  java.lang.ClassLoader
      java.security.SecureClassLoader
          java.net.URLClassLoader
              org.apache.catalina.loader.WebappClassLoader

All Implemented Interfaces:

Lifecycle

public class WebappClassLoader
extends URLClassLoader
implements Lifecycle

Specialized web application class loader.

This class loader is a full reimplementation of the URLClassLoader from the JDK. It is designed to be fully compatible with a normal URLClassLoader, although its internal behavior may be completely different.

IMPLEMENTATION NOTE - By default, this class loader follows the delegation model required by the specification. The system class loader will be queried first, then the local repositories, and only then delegation to the parent class loader will occur. This allows the web application to override any shared class except the classes from J2SE. Special handling is provided from the JAXP XML parser interfaces, the JNDI interfaces, and the classes from the servlet API, which are never loaded from the webapp repositories. The delegate property allows an application to modify this behavior to move the parent class loader ahead of the local repositories.

IMPLEMENTATION NOTE - Due to limitations in Jasper compilation technology, any repository which contains classes from the servlet API will be ignored by the class loader.

IMPLEMENTATION NOTE - The class loader generates source URLs which include the full JAR URL when a class is loaded from a JAR file, which allows setting security permission at the class level, even when a class is contained inside a JAR.

IMPLEMENTATION NOTE - Local repositories are searched in the order they are added via the initial constructor and/or any subsequent calls to addRepository() or addJar().

IMPLEMENTATION NOTE - No check for sealing violations or security is made unless a security manager is present.

TODO: Is there any requirement to provide a proper Lifecycle implementation rather than the current stubbed implementation?

Version:

$Id: WebappClassLoader.java 1348120 2012-06-08 15:39:09Z kkolinko $

Author:

Remy Maucherat, Craig R. McClanahan

Nested Class Summary

protected class	WebappClassLoader.PrivilegedFindResourceByName
protected static class	WebappClassLoader.PrivilegedGetClassLoader

Field Summary

protected Permission	allPermission All permission.
protected String	canonicalLoaderDir
protected boolean	delegate Should this class loader delegate to the parent class loader before searching its own repositories (i.e. the usual Java2 delegation model)?
protected File[]	files Repositories translated as path in the work directory (for Jasper originally), but which is used to generate fake URLs should getURLs be called.
protected boolean	hasExternalRepositories Has external repositories.
protected JarFile[]	jarFiles The list of JARs, in the order they should be searched for locally loaded classes or resources.
protected String[]	jarNames The list of JARs, in the order they should be searched for locally loaded classes or resources.
protected String	jarPath The path which will be monitored for added Jar files.
protected File[]	jarRealFiles The list of JARs, in the order they should be searched for locally loaded classes or resources.
protected long	lastJarAccessed Last time a JAR was accessed.
protected long[]	lastModifiedDates The list of JARs last modified dates, in the order they should be searched for locally loaded classes or resources.
protected File	loaderDir Path where resources loaded from JARs will be extracted.
protected HashMap<String,PermissionCollection>	loaderPC The PermissionCollection for each CodeSource for a web application context.
protected boolean	needConvert need conversion for properties files
protected HashMap<String,String>	notFoundResources The list of not found resources.
protected static String[]	packageTriggers Set of package names which are not allowed to be loaded from a webapp class loader without delegating first.
protected ClassLoader	parent The parent class loader.
protected String[]	paths The list of resources which should be checked when checking for modifications.
protected ArrayList<Permission>	permissionList A list of read File and Jndi Permission's required if this loader is for a web application context.
protected String[]	repositories The list of local repositories, in the order they should be searched for locally loaded classes or resources.
protected URL[]	repositoryURLs Repositories URLs, used to cache the result of getURLs.
protected HashMap<String,ResourceEntry>	resourceEntries The cache of ResourceEntry for classes and resources we have loaded, keyed by resource name.
protected DirContext	resources Associated directory context giving access to the resources in this webapp.
protected boolean	searchExternalFirst Search external repositories first
protected SecurityManager	securityManager Instance of the SecurityManager installed.
protected static StringManager	sm The string manager for this package.
protected boolean	started Has this component been started?
protected ClassLoader	system The system class loader.
protected static String[]	triggers The set of trigger classes that will cause a proposed repository not to be added if this class is visible to the class loader that loaded this factory class.

Fields inherited from interface org.apache.catalina.Lifecycle

AFTER_DESTROY_EVENT, AFTER_INIT_EVENT, AFTER_START_EVENT, AFTER_STOP_EVENT, BEFORE_DESTROY_EVENT, BEFORE_INIT_EVENT, BEFORE_START_EVENT, BEFORE_STOP_EVENT, CONFIGURE_START_EVENT, CONFIGURE_STOP_EVENT, PERIODIC_EVENT, START_EVENT, STOP_EVENT

Constructor Summary

WebappClassLoader()
Construct a new ClassLoader with no defined repositories and no parent ClassLoader.

WebappClassLoader(ClassLoader parent)
Construct a new ClassLoader with no defined repositories and the given parent ClassLoader.

Method Summary

void	addLifecycleListener(LifecycleListener listener) Add a lifecycle event listener to this component.
void	addPermission(Permission permission) If there is a Java SecurityManager create a Permission.
void	addPermission(String filepath) If there is a Java SecurityManager create a read FilePermission or JndiPermission for the file directory path.
void	addPermission(URL url) If there is a Java SecurityManager create a read FilePermission or JndiPermission for URL.
void	addRepository(String repository) Add a new repository to the set of places this ClassLoader can look for classes to be loaded.
protected void	addURL(URL url) Add the specified URL to the classloader.
protected void	clearReferences() Clear references.
void	closeJARs(boolean force) Used to periodically signal to the classloader to release JAR resources.
protected static void	deleteDir(File dir) Delete the specified directory, including all of its contents and subdirectories recursively.
void	destroy() Prepare to discard the object.
protected Class<?>	doDefineClass(String name, byte[] b, int off, int len, ProtectionDomain protectionDomain) Expose this method for use by the unit tests.
protected boolean	filter(String name) Filter classes.
Class<?>	findClass(String name) Find the specified class in our local repositories, if possible.
protected Class<?>	findClassInternal(String name) Find specified class in local repositories.
LifecycleListener[]	findLifecycleListeners() Get the lifecycle listeners associated with this lifecycle.
protected Class<?>	findLoadedClass0(String name) Finds the class with the given name if it has previously been loaded and cached by this class loader, and return the Class object.
protected InputStream	findLoadedResource(String name) 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.
String[]	findRepositories() Return a String array of the current repositories for this class loader.
URL	findResource(String name) Find the specified resource in our local repository, and return a URL referring to it, or null if this resource cannot be found.
protected ResourceEntry	findResourceInternal(File file, String path) Find specified resource in local repositories.
protected ResourceEntry	findResourceInternal(String name, String path) Find specified resource in local repositories.
Enumeration<URL>	findResources(String name) Return an enumeration of URLs representing all of the resources with the given name.
boolean	getAntiJARLocking()
boolean	getClearReferencesHttpClientKeepAliveThread() Return the clearReferencesHttpClientKeepAliveThread flag for this Context.
boolean	getClearReferencesLogFactoryRelease() Return the clearReferencesLogFactoryRelease flag for this Context.
boolean	getClearReferencesStatic() Return the clearReferencesStatic flag for this Context.
boolean	getClearReferencesStopThreads() Return the clearReferencesStopThreads flag for this Context.
boolean	getClearReferencesStopTimerThreads() Return the clearReferencesStopTimerThreads flag for this Context.
String	getContextName() Return the context name for this class loader.
boolean	getDelegate() Return the "delegate first" flag for this class loader.
String	getJarPath() Return the JAR path.
protected PermissionCollection	getPermissions(CodeSource codeSource) Get the Permissions for a CodeSource.
URL	getResource(String name) Find the resource with the given name.
InputStream	getResourceAsStream(String name) Find the resource with the given name, and return an input stream that can be used for reading it.
DirContext	getResources() Get associated resources.
boolean	getSearchExternalFirst()
LifecycleState	getState() Obtain the current state of the source component.
String	getStateName() Obtain a textual representation of the current component state.
protected URL	getURI(File file) Get URL.
protected URL	getURL(File file, boolean encoded) Get URL.
URL[]	getURLs() Returns the search path of URLs for loading classes and resources.
void	init() Prepare the component for starting.
protected boolean	isPackageSealed(String name, Manifest man) Returns true if the specified package name is sealed according to the given manifest.
boolean	isStarted()
Class<?>	loadClass(String name) Load the class with the specified name.
Class<?>	loadClass(String name, boolean resolve) Load the class with the specified name, searching using the following algorithm until it finds and returns the class.
boolean	modified() Have one or more classes or resources been modified so that a reload is appropriate?
protected boolean	openJARs() Used to periodically signal to the classloader to release JAR resources.
protected void	refreshPolicy() Refresh the system policy file, to pick up eventual changes.
void	removeLifecycleListener(LifecycleListener listener) Remove a lifecycle event listener from this component.
void	setAntiJARLocking(boolean antiJARLocking)
void	setClearReferencesHttpClientKeepAliveThread(boolean clearReferencesHttpClientKeepAliveThread) Set the clearReferencesHttpClientKeepAliveThread feature for this Context.
void	setClearReferencesLogFactoryRelease(boolean clearReferencesLogFactoryRelease) Set the clearReferencesLogFactoryRelease feature for this Context.
void	setClearReferencesStatic(boolean clearReferencesStatic) Set the clearReferencesStatic feature for this Context.
void	setClearReferencesStopThreads(boolean clearReferencesStopThreads) Set the clearReferencesStopThreads feature for this Context.
void	setClearReferencesStopTimerThreads(boolean clearReferencesStopTimerThreads) Set the clearReferencesStopTimerThreads feature for this Context.
void	setDelegate(boolean delegate) Set the "delegate first" flag for this class loader.
void	setJarPath(String jarPath) Change the Jar path.
protected void	setParentClassLoader(ClassLoader pcl) Utility method for use in subclasses.
void	setResources(DirContext resources) Set associated resources.
void	setSearchExternalFirst(boolean searchExternalFirst)
void	setWorkDir(File workDir) Change the work directory.
void	start() Start the class loader.
void	stop() Stop the class loader.
String	toString() Render a String representation of this object.
protected boolean	validate(String name) Validate a classname.
protected boolean	validateJarFile(File file) Check the specified JAR file, and return true if it does not contain any of the trigger classes.

Methods inherited from class java.net.URLClassLoader

definePackage, newInstance, newInstance

Methods inherited from class java.security.SecureClassLoader

defineClass, defineClass

Methods inherited from class java.lang.ClassLoader

clearAssertionStatus, defineClass, defineClass, defineClass, defineClass, definePackage, findLibrary, findLoadedClass, findSystemClass, getPackage, getPackages, getParent, getResources, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, resolveClass, setClassAssertionStatus, setDefaultAssertionStatus, setPackageAssertionStatus, setSigners

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

triggers

protected static final String[] triggers

The set of trigger classes that will cause a proposed repository not to be added if this class is visible to the class loader that loaded this factory class. Typically, trigger classes will be listed for components that have been integrated into the JDK for later versions, but where the corresponding JAR files are required to run on earlier versions.

packageTriggers

protected static final String[] packageTriggers

Set of package names which are not allowed to be loaded from a webapp class loader without delegating first.

sm

protected static final StringManager sm

The string manager for this package.

resources

protected DirContext resources

Associated directory context giving access to the resources in this webapp.

resourceEntries

protected HashMap<String,ResourceEntry> resourceEntries

The cache of ResourceEntry for classes and resources we have loaded, keyed by resource name.

notFoundResources

protected HashMap<String,String> notFoundResources

The list of not found resources.

delegate

protected boolean delegate

Should this class loader delegate to the parent class loader before searching its own repositories (i.e. the usual Java2 delegation model)? If set to false, this class loader will search its own repositories first, and delegate to the parent only if the class or resource is not found locally. Note that the default, false, is the behavior called for by the servlet specification.

lastJarAccessed

protected long lastJarAccessed

Last time a JAR was accessed.

repositories

protected String[] repositories

The list of local repositories, in the order they should be searched for locally loaded classes or resources.

repositoryURLs

protected URL[] repositoryURLs

Repositories URLs, used to cache the result of getURLs.

files

protected File[] files

Repositories translated as path in the work directory (for Jasper originally), but which is used to generate fake URLs should getURLs be called.

jarFiles

protected JarFile[] jarFiles

The list of JARs, in the order they should be searched for locally loaded classes or resources.

jarRealFiles

protected File[] jarRealFiles

The list of JARs, in the order they should be searched for locally loaded classes or resources.

jarPath

protected String jarPath

The path which will be monitored for added Jar files.

jarNames

protected String[] jarNames

The list of JARs, in the order they should be searched for locally loaded classes or resources.

lastModifiedDates

protected long[] lastModifiedDates

The list of JARs last modified dates, in the order they should be searched for locally loaded classes or resources.

paths

protected String[] paths

The list of resources which should be checked when checking for modifications.

permissionList

protected ArrayList<Permission> permissionList

A list of read File and Jndi Permission's required if this loader is for a web application context.

loaderDir

protected File loaderDir

Path where resources loaded from JARs will be extracted.

canonicalLoaderDir

protected String canonicalLoaderDir

loaderPC

protected HashMap<String,PermissionCollection> loaderPC

The PermissionCollection for each CodeSource for a web application context.

securityManager

protected SecurityManager securityManager

Instance of the SecurityManager installed.

parent

protected ClassLoader parent

The parent class loader.

system

protected ClassLoader system

The system class loader.

started

protected boolean started

Has this component been started?

hasExternalRepositories

protected boolean hasExternalRepositories

Has external repositories.

searchExternalFirst

protected boolean searchExternalFirst

Search external repositories first

needConvert

protected boolean needConvert

need conversion for properties files

allPermission

protected Permission allPermission

All permission.

Constructor Detail

WebappClassLoader

public WebappClassLoader()

Construct a new ClassLoader with no defined repositories and no parent ClassLoader.

WebappClassLoader

public WebappClassLoader(ClassLoader parent)

Construct a new ClassLoader with no defined repositories and the given parent ClassLoader.

Parameters:

parent - Our parent class loader

Method Detail

getResources

public DirContext getResources()

Get associated resources.

setResources

public void setResources(DirContext resources)

Set associated resources.

getContextName

public String getContextName()

Return the context name for this class loader.

getDelegate

public boolean getDelegate()

Return the "delegate first" flag for this class loader.

setDelegate

public void setDelegate(boolean delegate)

Set the "delegate first" flag for this class loader. If this flag is true, this class loader delegates to the parent class loader before searching its own repositories, as in an ordinary (non-servlet) chain of Java class loaders. If set to false (the default), this class loader will search its own repositories first, and delegate to the parent only if the class or resource is not found locally, as per the servlet specification.

Parameters:

delegate - The new "delegate first" flag

getAntiJARLocking

public boolean getAntiJARLocking()

Returns:

Returns the antiJARLocking.

setAntiJARLocking

public void setAntiJARLocking(boolean antiJARLocking)

Parameters:

antiJARLocking - The antiJARLocking to set.

getSearchExternalFirst

public boolean getSearchExternalFirst()

Returns:

Returns the searchExternalFirst.

setSearchExternalFirst

public void setSearchExternalFirst(boolean searchExternalFirst)

Parameters:

searchExternalFirst - Whether external repositories should be searched first

addPermission

public void addPermission(String filepath)

If there is a Java SecurityManager create a read FilePermission or JndiPermission for the file directory path.

Parameters:

filepath - file directory path

addPermission

public void addPermission(URL url)

If there is a Java SecurityManager create a read FilePermission or JndiPermission for URL.

Parameters:

url - URL for a file or directory on local system

addPermission

public void addPermission(Permission permission)

If there is a Java SecurityManager create a Permission.

Parameters:

permission - The permission

getJarPath

public String getJarPath()

Return the JAR path.

setJarPath

public void setJarPath(String jarPath)

Change the Jar path.

setWorkDir

public void setWorkDir(File workDir)

Change the work directory.

setParentClassLoader

protected void setParentClassLoader(ClassLoader pcl)

Utility method for use in subclasses. Must be called before Lifecycle methods to have any effect.

getClearReferencesStatic

public boolean getClearReferencesStatic()

Return the clearReferencesStatic flag for this Context.

setClearReferencesStatic

public void setClearReferencesStatic(boolean clearReferencesStatic)

Set the clearReferencesStatic feature for this Context.

Parameters:

clearReferencesStatic - The new flag value

getClearReferencesStopThreads

public boolean getClearReferencesStopThreads()

Return the clearReferencesStopThreads flag for this Context.

setClearReferencesStopThreads

public void setClearReferencesStopThreads(boolean clearReferencesStopThreads)

Set the clearReferencesStopThreads feature for this Context.

Parameters:

clearReferencesStopThreads - The new flag value

getClearReferencesStopTimerThreads

public boolean getClearReferencesStopTimerThreads()

Return the clearReferencesStopTimerThreads flag for this Context.

setClearReferencesStopTimerThreads

public void setClearReferencesStopTimerThreads(boolean clearReferencesStopTimerThreads)

Set the clearReferencesStopTimerThreads feature for this Context.

Parameters:

clearReferencesStopTimerThreads - The new flag value

getClearReferencesLogFactoryRelease

public boolean getClearReferencesLogFactoryRelease()

Return the clearReferencesLogFactoryRelease flag for this Context.

setClearReferencesLogFactoryRelease

public void setClearReferencesLogFactoryRelease(boolean clearReferencesLogFactoryRelease)

Set the clearReferencesLogFactoryRelease feature for this Context.

Parameters:

clearReferencesLogFactoryRelease - The new flag value

getClearReferencesHttpClientKeepAliveThread

public boolean getClearReferencesHttpClientKeepAliveThread()

Return the clearReferencesHttpClientKeepAliveThread flag for this Context.

setClearReferencesHttpClientKeepAliveThread

public void setClearReferencesHttpClientKeepAliveThread(boolean clearReferencesHttpClientKeepAliveThread)

Set the clearReferencesHttpClientKeepAliveThread feature for this Context.

Parameters:

clearReferencesHttpClientKeepAliveThread - The new flag value

addRepository

public void addRepository(String repository)

Add a new repository to the set of places this ClassLoader can look for classes to be loaded.

Parameters:

repository - Name of a source of classes to be loaded, such as a directory pathname, a JAR file pathname, or a ZIP file pathname

Throws:

IllegalArgumentException - if the specified repository is invalid or does not exist

findRepositories

public String[] findRepositories()

Return a String array of the current repositories for this class loader. If there are no repositories, a zero-length array is returned.For security reason, returns a clone of the Array (since String are immutable).

modified

public boolean modified()

Have one or more classes or resources been modified so that a reload is appropriate?

toString

public String toString()

Render a String representation of this object.

Overrides:

toString in class Object

addURL

protected void addURL(URL url)

Add the specified URL to the classloader.

Overrides:

addURL in class URLClassLoader

doDefineClass

protected final Class<?> doDefineClass(String name,
                                       byte[] b,
                                       int off,
                                       int len,
                                       ProtectionDomain protectionDomain)

Expose this method for use by the unit tests.

findClass

public Class<?> findClass(String name)
                   throws ClassNotFoundException

Find the specified class in our local repositories, if possible. If not found, throw ClassNotFoundException.

Overrides:

findClass in class URLClassLoader

Parameters:

name - Name of the class to be loaded

Throws:

ClassNotFoundException - if the class was not found

findResource

public URL findResource(String name)

Find the specified resource in our local repository, and return a URL referring to it, or null if this resource cannot be found.

Overrides:

findResource in class URLClassLoader

Parameters:

name - Name of the resource to be found

findResources

public Enumeration<URL> findResources(String name)
                               throws IOException

Return an enumeration of URLs representing all of the resources with the given name. If no resources with this name are found, return an empty enumeration.

Overrides:

findResources in class URLClassLoader

Parameters:

name - Name of the resources to be found

Throws:

IOException - if an input/output error occurs

getResource

public URL getResource(String 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 null.

This method searches according to the following algorithm, returning as soon as it finds the appropriate URL. If the resource cannot be found, returns null.

• If the delegate property is set to true, call the getResource() method of the parent class loader, if any.
• Call findResource() to find this resource in our locally defined repositories.
• Call the getResource() method of the parent class loader, if any.

Overrides:

getResource in class ClassLoader

Parameters:

name - Name of the resource to return a URL for

getResourceAsStream

public InputStream getResourceAsStream(String name)

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 getResource(), after checking to see if the resource data has been previously cached. If the resource cannot be found, return null.

Overrides:

getResourceAsStream in class ClassLoader

Parameters:

name - Name of the resource to return an input stream for

loadClass

public Class<?> loadClass(String name)
                   throws ClassNotFoundException

Load the class with the specified name. This method searches for classes in the same manner as loadClass(String, boolean) with false as the second argument.

Overrides:

loadClass in class ClassLoader

Parameters:

name - Name of the class to be loaded

Throws:

ClassNotFoundException - if the class was not found

loadClass

public Class<?> loadClass(String name,
                          boolean resolve)
                   throws ClassNotFoundException

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 ClassNotFoundException.

• Call findLoadedClass(String) to check if the class has already been loaded. If it has, the same Class object is returned.
• If the delegate property is set to true, call the loadClass() method of the parent class loader, if any.
• Call findClass() to find this class in our locally defined repositories.
• Call the loadClass() method of our parent class loader, if any.

If the class was found using the above steps, and the resolve flag is true, this method will then call resolveClass(Class) on the resulting Class object.

Overrides:

loadClass in class ClassLoader

Parameters:

name - Name of the class to be loaded

resolve - If true then resolve the class

Throws:

ClassNotFoundException - if the class was not found

getPermissions

protected PermissionCollection getPermissions(CodeSource codeSource)

Get the Permissions for a CodeSource. If this instance of WebappClassLoader is for a web application context, add read FilePermission or JndiPermissions for the base directory (if unpacked), the context URL, and jar file resources.

Overrides:

getPermissions in class URLClassLoader

Parameters:

codeSource - where the code was loaded from

Returns:

PermissionCollection for CodeSource

getURLs

public URL[] getURLs()

Returns the search path of URLs for loading classes and resources. This includes the original list of URLs specified to the constructor, along with any URLs subsequently appended by the addURL() method.

Overrides:

getURLs in class URLClassLoader

Returns:

the search path of URLs for loading classes and resources.

addLifecycleListener

public void addLifecycleListener(LifecycleListener listener)

Add a lifecycle event listener to this component.

Specified by:

addLifecycleListener in interface Lifecycle

Parameters:

listener - The listener to add

findLifecycleListeners

public LifecycleListener[] findLifecycleListeners()

Get the lifecycle listeners associated with this lifecycle. If this Lifecycle has no listeners registered, a zero-length array is returned.

Specified by:

findLifecycleListeners in interface Lifecycle

removeLifecycleListener

public void removeLifecycleListener(LifecycleListener listener)

Remove a lifecycle event listener from this component.

Specified by:

removeLifecycleListener in interface Lifecycle

Parameters:

listener - The listener to remove

getState

public LifecycleState getState()

Obtain the current state of the source component.

Specified by:

getState in interface Lifecycle

Returns:

The current state of the source component.

getStateName

public String getStateName()

Obtain a textual representation of the current component state. Useful for JMX.

Specified by:

getStateName in interface Lifecycle

init

public void init()

Description copied from interface: Lifecycle

Prepare the component for starting. This method should perform any initialization required post object creation. The following LifecycleEvents will be fired in the following order:

1. INIT_EVENT: On the successful completion of component initialization.

Specified by:

init in interface Lifecycle

start

public void start()
           throws LifecycleException

Start the class loader.

Specified by:

start in interface Lifecycle

Throws:

LifecycleException - if a lifecycle error occurs

isStarted

public boolean isStarted()

stop

public void stop()
          throws LifecycleException

Stop the class loader.

Specified by:

stop in interface Lifecycle

Throws:

LifecycleException - if a lifecycle error occurs

destroy

public void destroy()

Description copied from interface: Lifecycle

Prepare to discard the object. The following LifecycleEvents will be fired in the following order:

1. DESTROY_EVENT: On the successful completion of component destruction.

Specified by:

destroy in interface Lifecycle

closeJARs

public void closeJARs(boolean force)

Used to periodically signal to the classloader to release JAR resources.

clearReferences

protected void clearReferences()

Clear references.

openJARs

protected boolean openJARs()

Used to periodically signal to the classloader to release JAR resources.

findClassInternal

protected Class<?> findClassInternal(String name)
                              throws ClassNotFoundException

Find specified class in local repositories.

Returns:

the loaded class, or null if the class isn't found

Throws:

ClassNotFoundException

findResourceInternal

protected ResourceEntry findResourceInternal(File file,
                                             String path)

Find specified resource in local repositories.

Returns:

the loaded resource, or null if the resource isn't found

findResourceInternal

protected ResourceEntry findResourceInternal(String name,
                                             String path)

Find specified resource in local repositories.

Returns:

the loaded resource, or null if the resource isn't found

isPackageSealed

protected boolean isPackageSealed(String name,
                                  Manifest man)

Returns true if the specified package name is sealed according to the given manifest.

findLoadedResource

protected InputStream findLoadedResource(String name)

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 null.

Parameters:

name - Name of the resource to return

findLoadedClass0

protected Class<?> findLoadedClass0(String name)

Finds the class with the given name if it has previously been loaded and cached by this class loader, and return the Class object. If this class has not been cached, return null.

Parameters:

name - Name of the resource to return

refreshPolicy

protected void refreshPolicy()

Refresh the system policy file, to pick up eventual changes.

filter

protected boolean filter(String name)

Filter classes.

Parameters:

name - class name

Returns:

true if the class should be filtered

validate

protected boolean validate(String name)

Validate a classname. As per SRV.9.7.2, we must restrict loading of classes from J2SE (java.*) and most classes of the servlet API (javax.servlet.*). That should enhance robustness and prevent a number of user error (where an older version of servlet.jar would be present in /WEB-INF/lib).

Parameters:

name - class name

Returns:

true if the name is valid

validateJarFile

protected boolean validateJarFile(File file)
                           throws IOException

Check the specified JAR file, and return true if it does not contain any of the trigger classes.

Parameters:

file - The JAR file to be checked

Throws:

IOException - if an input/output error occurs

getURL

protected URL getURL(File file,
                     boolean encoded)
              throws MalformedURLException

Get URL.

Throws:

MalformedURLException

getURI

protected URL getURI(File file)
              throws MalformedURLException

Get URL.

Throws:

MalformedURLException

deleteDir

protected static void deleteDir(File dir)

Delete the specified directory, including all of its contents and subdirectories recursively.

Parameters:

dir - File object representing the directory to be deleted