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:
    Closeable, AutoCloseable, Lifecycle, WebappProperties, InstrumentableClassLoader, PermissionCheck
  Direct Known Subclasses:
    ParallelWebappClassLoader, WebappClassLoader

      public abstract class WebappClassLoaderBase
      extends 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 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.

  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`

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

      `Lifecycle.SingleUse`

  - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected Permission` | `allPermission` Deprecated. Unused. This will be removed in Tomcat 9.
    `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 HashMap<String,PermissionCollection>` | `loaderPC` The PermissionCollection for each CodeSource for a web application context.
    `protected ClassLoader` | `parent` The parent class loader.
    `protected ArrayList<Permission>` | `permissionList` A list of read File Permission's required if this loader is for a web application context.
    `protected Map<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 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(ClassLoader parent)` Construct a new ClassLoader with no defined repositories and the given parent ClassLoader.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `addLifecycleListener(LifecycleListener listener)` Add a lifecycle event listener to this component.
    `void` | `addTransformer(ClassFileTransformer transformer)` Adds the specified class file transformer to this class loader.
    `protected void` | `addURL(URL url)`
    `boolean` | `check(Permission permission)` Does this component have the given permission?
    `protected void` | `checkStateForClassLoading(String className)`
    `protected void` | `checkStateForResourceLoading(String resource)`
    `protected void` | `clearReferences()` Clear references.
    `protected void` | `copyStateWithoutTransformers(WebappClassLoaderBase base)`
    `void` | `destroy()` Prepare to discard the object.
    `protected Class<?>` | `doDefineClass(String name, byte[] b, int off, int len, ProtectionDomain protectionDomain)`
    `protected boolean` | `filter(String name)` Deprecated. Use `filter(String, boolean)` This will be removed in Tomcat 9
    `protected boolean` | `filter(String name, boolean isClassName)` 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.
    `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.
    `Enumeration<URL>` | `findResources(String name)` Return an enumeration of `URLs` representing all of the resources with the given name.
    `boolean` | `getClearReferencesHttpClientKeepAliveThread()`
    `boolean` | `getClearReferencesLogFactoryRelease()`
    `boolean` | `getClearReferencesRmiTargets()`
    `boolean` | `getClearReferencesStopThreads()`
    `boolean` | `getClearReferencesStopTimerThreads()`
    `String` | `getContextName()`
    `boolean` | `getDelegate()` Return the "delegate first" flag for this class loader.
    `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 ClassLoader` | `getJavaseClassLoader()`
    `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.
    `WebResourceRoot` | `getResources()`
    `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.
    `LifecycleState` | `getState()` Obtain the current state of the source component.
    `String` | `getStateName()` Obtain a textual representation of the current component state.
    `URL[]` | `getURLs()` Note that list of URLs returned by this method may not be complete.
    `String` | `getWebappName()` Returns a name for the logging system to use for the web application, if any, associated with the class loader.
    `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.
    `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 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(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` | `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` | `setDelegate(boolean delegate)` Set the "delegate first" flag for this class loader.
    `protected void` | `setJavaseClassLoader(ClassLoader classLoader)`
    `void` | `setResources(WebResourceRoot resources)` Set associated resources.
    `void` | `start()` Start the class loader.
    `void` | `stop()` Stop the class loader.
    `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, getResources, 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 Map<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 ArrayList<Permission> permissionList

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

    - #### loaderPC

          protected final HashMap<String,PermissionCollection> loaderPC

      The PermissionCollection for each CodeSource for a web application context.

    - #### securityManager

          protected final SecurityManager securityManager

      Instance of the SecurityManager installed.

    - #### parent

          protected final ClassLoader parent

      The parent class loader.

    - #### allPermission

          @Deprecated
          protected final Permission allPermission

      Deprecated. Unused. This will be removed in Tomcat 9.
      All permission.

  - ### Constructor Detail

    - #### WebappClassLoaderBase

          protected WebappClassLoaderBase()

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

    - #### WebappClassLoaderBase

          protected WebappClassLoaderBase(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

          public WebResourceRoot getResources()

      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 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

    - #### addTransformer

          public void addTransformer(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(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 String toString()

      Overrides:
        `toString` in class `Object`

    - #### doDefineClass

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

    - #### 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` - The binary 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 `URLClassLoader`
      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` - The binary 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` - The binary name of the class to be loaded
        `resolve` - If `true` then resolve the class
      Throws:
        `ClassNotFoundException` - if the class was not found

    - #### checkStateForClassLoading

          protected void checkStateForClassLoading(String className)
                                            throws ClassNotFoundException

      Throws:
        `ClassNotFoundException`

    - #### checkStateForResourceLoading

          protected void checkStateForResourceLoading(String resource)
                                               throws IllegalStateException

      Throws:
        `IllegalStateException`

    - #### getPermissions

          protected PermissionCollection getPermissions(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 `URLClassLoader`
      Parameters:
        `codeSource` - where the code was loaded from
      Returns:
        PermissionCollection for CodeSource

    - #### check

          public boolean check(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 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 `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 String getStateName()

      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 `LifecycleEvent`s 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 `LifecycleEvent`s 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 ClassLoader getJavaseClassLoader()

    - #### setJavaseClassLoader

          protected void setJavaseClassLoader(ClassLoader classLoader)

    - #### clearReferences

          protected void clearReferences()

      Clear references.

    - #### findClassInternal

          protected Class<?> findClassInternal(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(String name,
                                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 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` - 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(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

    - #### filter

          @Deprecated
          protected boolean filter(String name)

      Deprecated. Use `filter(String, boolean)` This will be removed in Tomcat 9
      Filter classes.
      Parameters:
        `name` - class name
      Returns:
        `true` if the class should be filtered

    - #### addURL

          protected void addURL(URL url)

      Overrides:
        `addURL` in class `URLClassLoader`

    - #### getWebappName

          public 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 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 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.

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