org.apache.catalina.loader

Class WebappClassLoaderBase

java.lang.Object

java.lang.ClassLoader

java.security.SecureClassLoader

java.net.URLClassLoader

org.apache.catalina.loader.WebappClassLoaderBase

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable, Lifecycle, WebappProperties, InstrumentableClassLoader, PermissionCheck

Direct Known Subclasses:

ParallelWebappClassLoader, WebappClassLoader

public abstract class WebappClassLoaderBase
extends java.net.URLClassLoader
implements Lifecycle, InstrumentableClassLoader, WebappProperties, PermissionCheck

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 bootstrap 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.

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

IMPLEMENTATION NOTE - As of 8.0, this class loader implements InstrumentableClassLoader, permitting web application classes to instrument other classes in the same web application. It does not permit instrumentation of system or container classes or classes in other web apps.

Author:

Remy Maucherat, Craig R. McClanahan

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected class	WebappClassLoaderBase.PrivilegedFindClassByName
protected static class	WebappClassLoaderBase.PrivilegedGetClassLoader
protected class	WebappClassLoaderBase.PrivilegedJavaseGetResource

Nested classes/interfaces inherited from interface org.apache.catalina.Lifecycle

Lifecycle.SingleUse

Field Summary

Fields

Modifier and Type	Field and Description
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 java.util.HashMap<java.lang.String,java.security.PermissionCollection>	loaderPC The PermissionCollection for each CodeSource for a web application context.
protected java.lang.ClassLoader	parent The parent class loader.
protected java.util.ArrayList<java.security.Permission>	permissionList A list of read File Permission's required if this loader is for a web application context.
protected java.util.Map<java.lang.String,ResourceEntry>	resourceEntries The cache of ResourceEntry for classes and resources we have loaded, keyed by resource path, not binary name.
protected WebResourceRoot	resources Associated web resources for this webapp.
protected java.lang.SecurityManager	securityManager Instance of the SecurityManager installed.
protected static StringManager	sm The string manager for this package.

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

Constructors

Modifier	Constructor and Description
protected	WebappClassLoaderBase() Construct a new ClassLoader with no defined repositories and no parent ClassLoader.
protected	WebappClassLoaderBase(java.lang.ClassLoader parent) Construct a new ClassLoader with no defined repositories and the given parent ClassLoader.

Method Summary

Modifier and Type	Method and Description
void	addLifecycleListener(LifecycleListener listener) Add a lifecycle event listener to this component.
void	addTransformer(java.lang.instrument.ClassFileTransformer transformer) Adds the specified class file transformer to this class loader.
protected void	addURL(java.net.URL url)
boolean	check(java.security.Permission permission) Does this component have the given permission?
protected void	checkStateForClassLoading(java.lang.String className)
protected void	checkStateForResourceLoading(java.lang.String resource)
protected void	clearReferences() Clear references.
protected void	copyStateWithoutTransformers(WebappClassLoaderBase base)
void	destroy() Prepare to discard the object.
protected java.lang.Class<?>	doDefineClass(java.lang.String name, byte[] b, int off, int len, java.security.ProtectionDomain protectionDomain)
protected boolean	filter(java.lang.String name, boolean isClassName) Filter classes.
java.lang.Class<?>	findClass(java.lang.String name) Find the specified class in our local repositories, if possible.
protected java.lang.Class<?>	findClassInternal(java.lang.String name) Find specified class in local repositories.
LifecycleListener[]	findLifecycleListeners() Get the lifecycle listeners associated with this lifecycle.
protected java.lang.Class<?>	findLoadedClass0(java.lang.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.
java.net.URL	findResource(java.lang.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.
java.util.Enumeration<java.net.URL>	findResources(java.lang.String name) Return an enumeration of URLs representing all of the resources with the given name.
boolean	getClearReferencesHttpClientKeepAliveThread()
boolean	getClearReferencesLogFactoryRelease()
boolean	getClearReferencesObjectStreamClassCaches()
boolean	getClearReferencesRmiTargets()
boolean	getClearReferencesStopThreads()
boolean	getClearReferencesStopTimerThreads()
boolean	getClearReferencesThreadLocals()
java.lang.String	getContextName()
boolean	getDelegate() Return the "delegate first" flag for this class loader.
java.lang.String	getHostName() Returns a name for the logging system to use for the Host where the web application, if any, associated with the class loader is deployed.
protected java.lang.ClassLoader	getJavaseClassLoader()
protected java.security.PermissionCollection	getPermissions(java.security.CodeSource codeSource) Get the Permissions for a CodeSource.
java.net.URL	getResource(java.lang.String name) Find the resource with the given name.
java.io.InputStream	getResourceAsStream(java.lang.String name) Find the resource with the given name, and return an input stream that can be used for reading it.
WebResourceRoot	getResources() Deprecated. This will be removed in Tomcat 10.1.x onwards
java.util.Enumeration<java.net.URL>	getResources(java.lang.String name)
java.lang.String	getServiceName() Returns a name for the logging system to use for the Service where the Host, if any, associated with the class loader is deployed.
boolean	getSkipMemoryLeakChecksOnJvmShutdown()
LifecycleState	getState() Obtain the current state of the source component.
java.lang.String	getStateName() Obtain a textual representation of the current component state.
java.net.URL[]	getURLs() Note that list of URLs returned by this method may not be complete.
java.lang.String	getWebappName() Returns a name for the logging system to use for the web application, if any, associated with the class loader.
boolean	hasLoggingConfig() Enables JULI to determine if the web application includes a local configuration without JULI having to look for the file which it may not have permission to do when running under a SecurityManager.
void	init() Prepare the component for starting.
protected boolean	isPackageSealed(java.lang.String name, java.util.jar.Manifest man) Returns true if the specified package name is sealed according to the given manifest.
java.lang.Class<?>	loadClass(java.lang.String name) Load the class with the specified name.
java.lang.Class<?>	loadClass(java.lang.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 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	removeTransformer(java.lang.instrument.ClassFileTransformer transformer) Removes the specified class file transformer from this class loader.
void	setClearReferencesHttpClientKeepAliveThread(boolean clearReferencesHttpClientKeepAliveThread) Set the clearReferencesHttpClientKeepAliveThread feature for this Context.
void	setClearReferencesLogFactoryRelease(boolean clearReferencesLogFactoryRelease) Set the clearReferencesLogFactoryRelease feature for this Context.
void	setClearReferencesObjectStreamClassCaches(boolean clearReferencesObjectStreamClassCaches)
void	setClearReferencesRmiTargets(boolean clearReferencesRmiTargets)
void	setClearReferencesStopThreads(boolean clearReferencesStopThreads) Set the clearReferencesStopThreads feature for this Context.
void	setClearReferencesStopTimerThreads(boolean clearReferencesStopTimerThreads) Set the clearReferencesStopTimerThreads feature for this Context.
void	setClearReferencesThreadLocals(boolean clearReferencesThreadLocals)
void	setDelegate(boolean delegate) Set the "delegate first" flag for this class loader.
protected void	setJavaseClassLoader(java.lang.ClassLoader classLoader)
void	setResources(WebResourceRoot resources) Set associated resources.
void	setSkipMemoryLeakChecksOnJvmShutdown(boolean skipMemoryLeakChecksOnJvmShutdown)
void	start() Start the class loader.
void	stop() Stop the class loader.
java.lang.String	toString()

Methods inherited from class java.net.URLClassLoader

close, 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, getClassLoadingLock, getPackage, getPackages, getParent, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, registerAsParallelCapable, resolveClass, setClassAssertionStatus, setDefaultAssertionStatus, setPackageAssertionStatus, setSigners

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.tomcat.InstrumentableClassLoader

copyWithoutTransformers

Field Detail

sm

protected static final StringManager sm

The string manager for this package.

resources

protected WebResourceRoot resources

Associated web resources for this webapp.

resourceEntries

protected final java.util.Map<java.lang.String,ResourceEntry> resourceEntries

The cache of ResourceEntry for classes and resources we have loaded, keyed by resource path, not binary name. Path is used as the key since resources may be requested by binary name (classes) or path (other resources such as property files) and the mapping from binary name to path is unambiguous but the reverse mapping is ambiguous.

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.

permissionList

protected final java.util.ArrayList<java.security.Permission> permissionList

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

loaderPC

protected final java.util.HashMap<java.lang.String,java.security.PermissionCollection> loaderPC

The PermissionCollection for each CodeSource for a web application context.

securityManager

protected final java.lang.SecurityManager securityManager

Instance of the SecurityManager installed.

parent

protected final java.lang.ClassLoader parent

The parent class loader.

Constructor Detail

WebappClassLoaderBase

protected WebappClassLoaderBase()

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

WebappClassLoaderBase

protected WebappClassLoaderBase(java.lang.ClassLoader parent)

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

Method is used via reflection - see WebappLoader.createClassLoader()

Parameters:

parent - Our parent class loader

Method Detail

getResources

@Deprecated
public WebResourceRoot getResources()

Deprecated. This will be removed in Tomcat 10.1.x onwards

Unused. Always returns null.

Returns:

associated resources.

setResources

public void setResources(WebResourceRoot resources)

Set associated resources.

Parameters:

resources - the resources from which the classloader will load the classes

getContextName

public java.lang.String getContextName()

Returns:

the context name for this class loader.

getDelegate

public boolean getDelegate()

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

Returns:

true if the class lookup will delegate to the parent first. The default in Tomcat is false.

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

getClearReferencesRmiTargets

public boolean getClearReferencesRmiTargets()

setClearReferencesRmiTargets

public void setClearReferencesRmiTargets(boolean clearReferencesRmiTargets)

getClearReferencesStopThreads

public boolean getClearReferencesStopThreads()

Returns:

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()

Returns:

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()

Returns:

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()

Returns:

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

getClearReferencesObjectStreamClassCaches

public boolean getClearReferencesObjectStreamClassCaches()

setClearReferencesObjectStreamClassCaches

public void setClearReferencesObjectStreamClassCaches(boolean clearReferencesObjectStreamClassCaches)

getClearReferencesThreadLocals

public boolean getClearReferencesThreadLocals()

setClearReferencesThreadLocals

public void setClearReferencesThreadLocals(boolean clearReferencesThreadLocals)

getSkipMemoryLeakChecksOnJvmShutdown

public boolean getSkipMemoryLeakChecksOnJvmShutdown()

setSkipMemoryLeakChecksOnJvmShutdown

public void setSkipMemoryLeakChecksOnJvmShutdown(boolean skipMemoryLeakChecksOnJvmShutdown)

addTransformer

public void addTransformer(java.lang.instrument.ClassFileTransformer transformer)

Adds the specified class file transformer to this class loader. The transformer will then be able to modify the bytecode of any classes loaded by this class loader after the invocation of this method.

Specified by:

addTransformer in interface InstrumentableClassLoader

Parameters:

transformer - The transformer to add to the class loader

removeTransformer

public void removeTransformer(java.lang.instrument.ClassFileTransformer transformer)

Removes the specified class file transformer from this class loader. It will no longer be able to modify the byte code of any classes loaded by the class loader after the invocation of this method. However, any classes already modified by this transformer will remain transformed.

Specified by:

removeTransformer in interface InstrumentableClassLoader

Parameters:

transformer - The transformer to remove

copyStateWithoutTransformers

protected void copyStateWithoutTransformers(WebappClassLoaderBase base)

modified

public boolean modified()

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

Returns:

true if there's been a modification

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

doDefineClass

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

findClass

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

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

Overrides:

findClass in class java.net.URLClassLoader

Parameters:

name - The binary name of the class to be loaded

Throws:

java.lang.ClassNotFoundException - if the class was not found

findResource

public java.net.URL findResource(java.lang.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 java.net.URLClassLoader

Parameters:

name - Name of the resource to be found

findResources

public java.util.Enumeration<java.net.URL> findResources(java.lang.String name)
                                                  throws java.io.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 java.net.URLClassLoader

Parameters:

name - Name of the resources to be found

Throws:

java.io.IOException - if an input/output error occurs

getResource

public java.net.URL getResource(java.lang.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 java.lang.ClassLoader

Parameters:

name - Name of the resource to return a URL for

getResources

public java.util.Enumeration<java.net.URL> getResources(java.lang.String name)
                                                 throws java.io.IOException

Overrides:

getResources in class java.lang.ClassLoader

Throws:

java.io.IOException

getResourceAsStream

public java.io.InputStream getResourceAsStream(java.lang.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 java.net.URLClassLoader

Parameters:

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

loadClass

public java.lang.Class<?> loadClass(java.lang.String name)
                             throws java.lang.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 java.lang.ClassLoader

Parameters:

name - The binary name of the class to be loaded

Throws:

java.lang.ClassNotFoundException - if the class was not found

loadClass

public java.lang.Class<?> loadClass(java.lang.String name,
                                    boolean resolve)
                             throws java.lang.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 java.lang.ClassLoader

Parameters:

name - The binary name of the class to be loaded

resolve - If true then resolve the class

Throws:

java.lang.ClassNotFoundException - if the class was not found

checkStateForClassLoading

protected void checkStateForClassLoading(java.lang.String className)
                                  throws java.lang.ClassNotFoundException

Throws:

java.lang.ClassNotFoundException

checkStateForResourceLoading

protected void checkStateForResourceLoading(java.lang.String resource)
                                     throws java.lang.IllegalStateException

Throws:

java.lang.IllegalStateException

getPermissions

protected java.security.PermissionCollection getPermissions(java.security.CodeSource codeSource)

Get the Permissions for a CodeSource. If this instance of WebappClassLoaderBase is for a web application context, add read FilePermission for the appropriate resources.

Overrides:

getPermissions in class java.net.URLClassLoader

Parameters:

codeSource - where the code was loaded from

Returns:

PermissionCollection for CodeSource

check

public boolean check(java.security.Permission permission)

Description copied from interface: PermissionCheck

Does this component have the given permission?

Specified by:

check in interface PermissionCheck

Parameters:

permission - The permission to test

Returns:

false if a SecurityManager is enabled and the component does not have the given permission, otherwise true

getURLs

public java.net.URL[] getURLs()

Note that list of URLs returned by this method may not be complete. The web application class loader accesses class loader resources via the WebResourceRoot which supports the arbitrary mapping of additional files, directories and contents of JAR files under WEB-INF/classes. Any such resources will not be included in the URLs returned here.

Overrides:

getURLs in class java.net.URLClassLoader

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

Returns:

An array containing the life cycle listeners associated with this life cycle. If this component has no listeners registered, a zero-length array is returned.

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 java.lang.String getStateName()

Description copied from interface: Lifecycle

Obtain a textual representation of the current component state. Useful for JMX. The format of this string may vary between point releases and should not be relied upon to determine component state. To determine component state, use Lifecycle.getState().

Specified by:

getStateName in interface Lifecycle

Returns:

The name of the current component state.

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

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

getJavaseClassLoader

protected java.lang.ClassLoader getJavaseClassLoader()

setJavaseClassLoader

protected void setJavaseClassLoader(java.lang.ClassLoader classLoader)

clearReferences

protected void clearReferences()

Clear references.

findClassInternal

protected java.lang.Class<?> findClassInternal(java.lang.String name)

Find specified class in local repositories.

Parameters:

name - The binary name of the class to be loaded

Returns:

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

isPackageSealed

protected boolean isPackageSealed(java.lang.String name,
                                  java.util.jar.Manifest man)

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

Parameters:

name - Path name to check

man - Associated manifest

Returns:

true if the manifest associated says it is sealed

findLoadedClass0

protected java.lang.Class<?> findLoadedClass0(java.lang.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 - The binary name of the resource to return

Returns:

a loaded class

refreshPolicy

protected void refreshPolicy()

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

filter

protected boolean filter(java.lang.String name,
                         boolean isClassName)

Filter classes.

Parameters:

name - class name

isClassName - true if name is a class name, false if name is a resource name

Returns:

true if the class should be filtered

addURL

protected void addURL(java.net.URL url)

Overrides:

addURL in class java.net.URLClassLoader

getWebappName

public java.lang.String getWebappName()

Description copied from interface: WebappProperties

Returns a name for the logging system to use for the web application, if any, associated with the class loader.

Specified by:

getWebappName in interface WebappProperties

Returns:

The name to use for the web application or null if none is available.

getHostName

public java.lang.String getHostName()

Description copied from interface: WebappProperties

Returns a name for the logging system to use for the Host where the web application, if any, associated with the class loader is deployed.

Specified by:

getHostName in interface WebappProperties

Returns:

The name to use for the Host where the web application is deployed or null if none is available.

getServiceName

public java.lang.String getServiceName()

Description copied from interface: WebappProperties

Returns a name for the logging system to use for the Service where the Host, if any, associated with the class loader is deployed.

Specified by:

getServiceName in interface WebappProperties

Returns:

The name to use for the Service where the Host is deployed or null if none is available.

hasLoggingConfig

public boolean hasLoggingConfig()

Description copied from interface: WebappProperties

Enables JULI to determine if the web application includes a local configuration without JULI having to look for the file which it may not have permission to do when running under a SecurityManager.

Specified by:

hasLoggingConfig in interface WebappProperties

Returns:

true if the web application includes a logging configuration at the standard location of /WEB-INF/classes/logging.properties.