public interface ServletContext
 There is one context per "web application" per Java Virtual Machine. (A
 "web application" is a collection of servlets and content installed under a
 specific subset of the server's URL namespace such as /catalog
 and possibly installed via a .war file.)
 
In the case of a web application marked "distributed" in its deployment descriptor, there will be one context instance for each virtual machine. In this situation, the context cannot be used as a location to share global information (because the information won't be truly global). Use an external resource like a database instead.
 The ServletContext object is contained within the
 ServletConfig object, which the Web server provides the servlet when
 the servlet is initialized.
| Modifier and Type | Field and Description | 
|---|---|
| static String | ORDERED_LIBS | 
| static String | TEMPDIR | 
| Modifier and Type | Method and Description | 
|---|---|
| FilterRegistration.Dynamic | addFilter(String filterName,
         Class<? extends Filter> filterClass)Add filter to context. | 
| FilterRegistration.Dynamic | addFilter(String filterName,
         Filter filter)Add filter to context. | 
| FilterRegistration.Dynamic | addFilter(String filterName,
         String className)Add filter to context. | 
| void | addListener(Class<? extends EventListener> listenerClass)TODO SERVLET3 - Add comments | 
| void | addListener(String className)TODO SERVLET3 - Add comments | 
| <T extends EventListener>  | addListener(T t)TODO SERVLET3 - Add comments | 
| ServletRegistration.Dynamic | addServlet(String servletName,
          Class<? extends Servlet> servletClass)Add servlet to context. | 
| ServletRegistration.Dynamic | addServlet(String servletName,
          Servlet servlet)Register a servlet instance for use in this ServletContext. | 
| ServletRegistration.Dynamic | addServlet(String servletName,
          String className)Register a servlet implementation for use in this ServletContext. | 
| <T extends Filter>  | createFilter(Class<T> c)TODO SERVLET3 - Add comments | 
| <T extends EventListener>  | createListener(Class<T> c)TODO SERVLET3 - Add comments | 
| <T extends Servlet>  | createServlet(Class<T> c)TODO SERVLET3 - Add comments | 
| void | declareRoles(String... roleNames)Add to the declared roles for this ServletContext. | 
| Object | getAttribute(String name)Returns the servlet container attribute with the given name, or
  nullif there is no attribute by that name. | 
| Enumeration<String> | getAttributeNames()Returns an  Enumerationcontaining the attribute names
 available within this servlet context. | 
| ClassLoader | getClassLoader()Get the web application class loader associated with this ServletContext. | 
| ServletContext | getContext(String uripath)Returns a  ServletContextobject that corresponds to a
 specified URL on the server. | 
| String | getContextPath()Return the main path associated with this context. | 
| Set<SessionTrackingMode> | getDefaultSessionTrackingModes()Obtains the default session tracking modes for this web application. | 
| int | getEffectiveMajorVersion() | 
| int | getEffectiveMinorVersion() | 
| Set<SessionTrackingMode> | getEffectiveSessionTrackingModes()Obtains the currently enabled session tracking modes for this web
 application. | 
| FilterRegistration | getFilterRegistration(String filterName)TODO SERVLET3 - Add comments | 
| Map<String,? extends FilterRegistration> | getFilterRegistrations() | 
| String | getInitParameter(String name)Returns a  Stringcontaining the value of the named
 context-wide initialization parameter, ornullif the
 parameter does not exist. | 
| Enumeration<String> | getInitParameterNames()Returns the names of the context's initialization parameters as an
  EnumerationofStringobjects, or an emptyEnumerationif the context has no initialization parameters. | 
| JspConfigDescriptor | getJspConfigDescriptor() | 
| int | getMajorVersion()Returns the major version of the Java Servlet API that this servlet
 container supports. | 
| String | getMimeType(String file)Returns the MIME type of the specified file, or  nullif the
 MIME type is not known. | 
| int | getMinorVersion()Returns the minor version of the Servlet API that this servlet container
 supports. | 
| RequestDispatcher | getNamedDispatcher(String name)Returns a  RequestDispatcherobject that acts as a wrapper for the
 named servlet. | 
| String | getRealPath(String path)Returns a  Stringcontaining the real path for a given
 virtual path. | 
| RequestDispatcher | getRequestDispatcher(String path)Returns a  RequestDispatcherobject that acts as a wrapper for the
 resource located at the given path. | 
| URL | getResource(String path)Returns a URL to the resource that is mapped to a specified path. | 
| InputStream | getResourceAsStream(String path)Returns the resource located at the named path as an
  InputStreamobject. | 
| Set<String> | getResourcePaths(String path)Returns a directory-like listing of all the paths to resources within the
 web application whose longest sub-path matches the supplied path
 argument. | 
| String | getServerInfo()Returns the name and version of the servlet container on which the
 servlet is running. | 
| Servlet | getServlet(String name)Deprecated. 
 As of Java Servlet API 2.1, with no direct replacement. | 
| String | getServletContextName()Returns the name of this web application corresponding to this
 ServletContext as specified in the deployment descriptor for this web
 application by the display-name element. | 
| Enumeration<String> | getServletNames()Deprecated. 
 As of Java Servlet API 2.1, with no replacement. | 
| ServletRegistration | getServletRegistration(String servletName)Obtain the details of the named servlet. | 
| Map<String,? extends ServletRegistration> | getServletRegistrations()TODO SERVLET3 - Add comments | 
| Enumeration<Servlet> | getServlets()Deprecated. 
 As of Java Servlet API 2.0, with no replacement. | 
| SessionCookieConfig | getSessionCookieConfig() | 
| void | log(Exception exception,
   String msg)Deprecated. 
 As of Java Servlet API 2.1, use
              log(String message, Throwable throwable)instead.This method was originally defined to write an exception's stack trace and an explanatory error message to the servlet log file. | 
| void | log(String msg)Writes the specified message to a servlet log file, usually an event log. | 
| void | log(String message,
   Throwable throwable)Writes an explanatory message and a stack trace for a given
  Throwableexception to the servlet log file. | 
| void | removeAttribute(String name)Removes the attribute with the given name from the servlet context. | 
| void | setAttribute(String name,
            Object object)Binds an object to a given attribute name in this servlet context. | 
| boolean | setInitParameter(String name,
                String value)Set the given initialisation parameter to the given value. | 
| void | setSessionTrackingModes(Set<SessionTrackingMode> sessionTrackingModes)Configures the available session tracking modes for this web application. | 
static final String TEMPDIR
static final String ORDERED_LIBS
String getContextPath()
ServletContext getContext(String uripath)
ServletContext object that corresponds to a
 specified URL on the server.
 
 This method allows servlets to gain access to the context for various
 parts of the server, and as needed obtain RequestDispatcher
 objects from the context. The given path must be begin with "/", is
 interpreted relative to the server's document root and is matched against
 the context roots of other web applications hosted on this container.
 
 In a security conscious environment, the servlet container may return
 null for a given URL.
uripath - a String specifying the context path of another
            web application in the container.ServletContext object that corresponds to the
         named URL, or null if either none exists or the container wishes
         to restrict this access.RequestDispatcherint getMajorVersion()
int getMinorVersion()
int getEffectiveMajorVersion()
UnsupportedOperationException - If called from a
    ServletContextListener.contextInitialized(ServletContextEvent)
    method of a ServletContextListener that was not defined in a
    web.xml file, a web-fragment.xml file nor annotated with
    WebListener. For example, a
    ServletContextListener defined in a TLD would not be able to
    use this method.int getEffectiveMinorVersion()
UnsupportedOperationException - If called from a
    ServletContextListener.contextInitialized(ServletContextEvent)
    method of a ServletContextListener that was not defined in a
    web.xml file, a web-fragment.xml file nor annotated with
    WebListener. For example, a
    ServletContextListener defined in a TLD would not be able to
    use this method.String getMimeType(String file)
null if the
 MIME type is not known. The MIME type is determined by the configuration
 of the servlet container, and may be specified in a web application
 deployment descriptor. Common MIME types are "text/html" and
 "image/gif".file - a String specifying the name of a fileString specifying the file's MIME typeSet<String> getResourcePaths(String path)
path - the partial path used to match the resources, which must start
            with a /URL getResource(String path) throws MalformedURLException
 This method allows the servlet container to make a resource available to
 servlets from any source. Resources can be located on a local or remote
 file system, in a database, or in a .war file.
 
 The servlet container must implement the URL handlers and
 URLConnection objects that are necessary to access the
 resource.
 
 This method returns null if no resource is mapped to the
 pathname.
 
Some containers may allow writing to the URL returned by this method using the methods of the URL class.
 The resource content is returned directly, so be aware that requesting a
 .jsp page returns the JSP source code. Use a
 RequestDispatcher instead to include results of an
 execution.
 
 This method has a different purpose than
 java.lang.Class.getResource, which looks up resources based
 on a class loader. This method does not use class loaders.
path - a String specifying the path to the resourcenull if
         there is no resource at that pathMalformedURLException - if the pathname is not given in the correct formInputStream getResourceAsStream(String path)
InputStream object.
 
 The data in the InputStream can be of any type or length.
 The path must be specified according to the rules given in
 getResource. This method returns null if no
 resource exists at the specified path.
 
 Meta-information such as content length and content type that is
 available via getResource method is lost when using this
 method.
 
 The servlet container must implement the URL handlers and
 URLConnection objects necessary to access the resource.
 
 This method is different from
 java.lang.Class.getResourceAsStream, which uses a class
 loader. This method allows servlet containers to make a resource
 available to a servlet from any location, without using a class loader.
path - a String specifying the path to the resourceInputStream returned to the servlet, or
         null if no resource exists at the specified pathRequestDispatcher getRequestDispatcher(String path)
RequestDispatcher object that acts as a wrapper for the
 resource located at the given path. A RequestDispatcher
 object can be used to forward a request to the resource or to include the
 resource in a response. The resource can be dynamic or static.
 
 The pathname must begin with a "/" and is interpreted as relative to the
 current context root. Use getContext to obtain a
 RequestDispatcher for resources in foreign contexts. This
 method returns null if the ServletContext
 cannot return a RequestDispatcher.
path - a String specifying the pathname to the resourceRequestDispatcher object that acts as a wrapper for
         the resource at the specified path, or null if the
         ServletContext cannot return a
         RequestDispatcherRequestDispatcher, 
getContext(java.lang.String)RequestDispatcher getNamedDispatcher(String name)
RequestDispatcher object that acts as a wrapper for the
 named servlet.
 
 Servlets (and JSP pages also) may be given names via server
 administration or via a web application deployment descriptor. A servlet
 instance can determine its name using
 ServletConfig.getServletName().
 
 This method returns null if the ServletContext
 cannot return a RequestDispatcher for any reason.
name - a String specifying the name of a servlet to wrapRequestDispatcher object that acts as a wrapper for
         the named servlet, or null if the
         ServletContext cannot return a
         RequestDispatcherRequestDispatcher, 
getContext(java.lang.String), 
ServletConfig.getServletName()Servlet getServlet(String name) throws ServletException
ServletContext. In this version, this method always
 returns null and remains only to preserve binary
 compatibility. This method will be permanently removed in a future
 version of the Java Servlet API.
 
 In lieu of this method, servlets can share information using the
 ServletContext class and can perform shared business logic
 by invoking methods on common non-servlet classes.
name - Not usednullServletException - neverEnumeration<Servlet> getServlets()
Enumeration of all the servlets known to this servlet
 context. In this version, this method always returns an empty enumeration
 and remains only to preserve binary compatibility. This method will be
 permanently removed in a future version of the Java Servlet API.Enumeration<String> getServletNames()
Enumeration of all the servlet names known to this context.
 In this version, this method always returns an empty
 Enumeration and remains only to preserve binary
 compatibility. This method will be permanently removed in a future
 version of the Java Servlet API.void log(String msg)
msg - a String specifying the message to be written to
            the log filevoid log(Exception exception, String msg)
log(String message, Throwable throwable) instead.
             This method was originally defined to write an exception's stack trace and an explanatory error message to the servlet log file.
exception - The exception to logmsg - The message to log with the exceptionvoid log(String message, Throwable throwable)
Throwable exception to the servlet log file. The name and
 type of the servlet log file is specific to the servlet container,
 usually an event log.message - a String that describes the error or exceptionthrowable - the Throwable error or exceptionString getRealPath(String path)
String containing the real path for a given
 virtual path. For example, the path "/index.html" returns the absolute
 file path on the server's filesystem would be served by a request for
 "http://host/contextPath/index.html", where contextPath is the context
 path of this ServletContext..
 
 The real path returned will be in a form appropriate to the computer and
 operating system on which the servlet container is running, including the
 proper path separators. This method returns null if the
 servlet container cannot translate the virtual path to a real path for
 any reason (such as when the content is being made available from a
 .war archive).
path - a String specifying a virtual pathString specifying the real path, or null if the
         translation cannot be performedString getServerInfo()
 The form of the returned string is
 servername/versionnumber. For example, the JavaServer Web
 Development Kit may return the string
 JavaServer Web Dev Kit/1.0.
 
 The servlet container may return other optional information after the
 primary string in parentheses, for example,
 JavaServer Web Dev Kit/1.0 (JDK 1.1.6; Windows NT 4.0 x86).
String containing at least the servlet container
         name and version numberString getInitParameter(String name)
String containing the value of the named
 context-wide initialization parameter, or null if the
 parameter does not exist.
 This method can make available configuration information useful to an entire "web application". For example, it can provide a webmaster's email address or the name of a system that holds critical data.
name - a String containing the name of the parameter
            whose value is requestedString containing the value of the initialization
         parameterNullPointerException - If the provided parameter name is
         nullServletConfig.getInitParameter(java.lang.String)Enumeration<String> getInitParameterNames()
Enumeration of String objects, or an empty
 Enumeration if the context has no initialization parameters.Enumeration of String objects
         containing the names of the context's initialization parametersServletConfig.getInitParameter(java.lang.String)boolean setInitParameter(String name, String value)
name - Name of initialisation parametervalue - Value for initialisation parametertrue if the call succeeds or false if
         the call fails because an initialisation parameter with the same
         name has already been setIllegalStateException - If initialisation of this ServletContext
         has already completedUnsupportedOperationException - If called from a
    ServletContextListener.contextInitialized(ServletContextEvent)
    method of a ServletContextListener that was not defined in a
    web.xml file, a web-fragment.xml file nor annotated with
    WebListener. For example, a
    ServletContextListener defined in a TLD would not be able to
    use this method.NullPointerException - If the provided parameter name is
         nullObject getAttribute(String name)
null if there is no attribute by that name. An attribute
 allows a servlet container to give the servlet additional information not
 already provided by this interface. See your server documentation for
 information about its attributes. A list of supported attributes can be
 retrieved using getAttributeNames.
 
 The attribute is returned as a java.lang.Object or some
 subclass. Attribute names should follow the same convention as package
 names. The Java Servlet API specification reserves names matching
 java.*, javax.*, and sun.*.
name - a String specifying the name of the attributeObject containing the value of the attribute, or
         null if no attribute exists matching the given nameNullPointerException - If the provided attribute name is
         nullgetAttributeNames()Enumeration<String> getAttributeNames()
Enumeration containing the attribute names
 available within this servlet context. Use the getAttribute(java.lang.String)
 method with an attribute name to get the value of an attribute.Enumeration of attribute namesgetAttribute(java.lang.String)void setAttribute(String name, Object object)
 If listeners are configured on the ServletContext the
 container notifies them accordingly.
 
 If a null value is passed, the effect is the same as calling
 removeAttribute().
 
 Attribute names should follow the same convention as package names. The
 Java Servlet API specification reserves names matching
 java.*, javax.*, and sun.*.
name - a String specifying the name of the attributeobject - an Object representing the attribute to be boundNullPointerException - If the provided attribute name is
         nullvoid removeAttribute(String name)
getAttribute(java.lang.String) to retrieve the
 attribute's value will return null.
 
 If listeners are configured on the ServletContext the
 container notifies them accordingly.
name - a String specifying the name of the attribute to
            be removedString getServletContextName()
ServletRegistration.Dynamic addServlet(String servletName, String className)
servletName - The name of the servlet to registerclassName - The implementation class for the servletIllegalStateException - If the context has already been initialisedUnsupportedOperationException - If called from a
    ServletContextListener.contextInitialized(ServletContextEvent)
    method of a ServletContextListener that was not defined in a
    web.xml file, a web-fragment.xml file nor annotated with
    WebListener. For example, a
    ServletContextListener defined in a TLD would not be able to
    use this method.ServletRegistration.Dynamic addServlet(String servletName, Servlet servlet)
servletName - The name of the servlet to registerservlet - The Servlet instance to registerIllegalStateException - If the context has already been initialisedUnsupportedOperationException - If called from a
    ServletContextListener.contextInitialized(ServletContextEvent)
    method of a ServletContextListener that was not defined in a
    web.xml file, a web-fragment.xml file nor annotated with
    WebListener. For example, a
    ServletContextListener defined in a TLD would not be able to
    use this method.ServletRegistration.Dynamic addServlet(String servletName, Class<? extends Servlet> servletClass)
servletName - Name of servlet to addservletClass - Class of servlet to addnull if the servlet has already been fully defined,
          else a ServletRegistration.Dynamic object
          that can be used to further configure the servletIllegalStateException - If the context has already been initialisedUnsupportedOperationException - If called from a
    ServletContextListener.contextInitialized(ServletContextEvent)
    method of a ServletContextListener that was not defined in a
    web.xml file, a web-fragment.xml file nor annotated with
    WebListener. For example, a
    ServletContextListener defined in a TLD would not be able to
    use this method.<T extends Servlet> T createServlet(Class<T> c) throws ServletException
T - TODOc - TODOServletException - TODOUnsupportedOperationException - If called from a
    ServletContextListener.contextInitialized(ServletContextEvent)
    method of a ServletContextListener that was not defined in a
    web.xml file, a web-fragment.xml file nor annotated with
    WebListener. For example, a
    ServletContextListener defined in a TLD would not be able to
    use this method.ServletRegistration getServletRegistration(String servletName)
servletName - The name of the Servlet of interestnull if no Servlet has been registered with the
          given nameUnsupportedOperationException - If called from a
    ServletContextListener.contextInitialized(ServletContextEvent)
    method of a ServletContextListener that was not defined in a
    web.xml file, a web-fragment.xml file nor annotated with
    WebListener. For example, a
    ServletContextListener defined in a TLD would not be able to
    use this method.Map<String,? extends ServletRegistration> getServletRegistrations()
UnsupportedOperationException - If called from a
    ServletContextListener.contextInitialized(ServletContextEvent)
    method of a ServletContextListener that was not defined in a
    web.xml file, a web-fragment.xml file nor annotated with
    WebListener. For example, a
    ServletContextListener defined in a TLD would not be able to
    use this method.FilterRegistration.Dynamic addFilter(String filterName, String className)
filterName - Name of filter to addclassName - Name of filter classnull if the filter has already been fully defined,
          else a FilterRegistration.Dynamic object
          that can be used to further configure the filterUnsupportedOperationException - If called from a
    ServletContextListener.contextInitialized(ServletContextEvent)
    method of a ServletContextListener that was not defined in a
    web.xml file, a web-fragment.xml file nor annotated with
    WebListener. For example, a
    ServletContextListener defined in a TLD would not be able to
    use this method.IllegalStateException - If the context has already been initialisedFilterRegistration.Dynamic addFilter(String filterName, Filter filter)
filterName - Name of filter to addfilter - Filter to addnull if the filter has already been fully defined,
          else a FilterRegistration.Dynamic object
          that can be used to further configure the filterUnsupportedOperationException - If called from a
    ServletContextListener.contextInitialized(ServletContextEvent)
    method of a ServletContextListener that was not defined in a
    web.xml file, a web-fragment.xml file nor annotated with
    WebListener. For example, a
    ServletContextListener defined in a TLD would not be able to
    use this method.IllegalStateException - If the context has already been initialisedFilterRegistration.Dynamic addFilter(String filterName, Class<? extends Filter> filterClass)
filterName - Name of filter to addfilterClass - Class of filter to addnull if the filter has already been fully defined,
          else a FilterRegistration.Dynamic object
          that can be used to further configure the filterUnsupportedOperationException - If called from a
    ServletContextListener.contextInitialized(ServletContextEvent)
    method of a ServletContextListener that was not defined in a
    web.xml file, a web-fragment.xml file nor annotated with
    WebListener. For example, a
    ServletContextListener defined in a TLD would not be able to
    use this method.IllegalStateException - If the context has already been initialised<T extends Filter> T createFilter(Class<T> c) throws ServletException
T - TODOc - TODOUnsupportedOperationException - If called from a
    ServletContextListener.contextInitialized(ServletContextEvent)
    method of a ServletContextListener that was not defined in a
    web.xml file, a web-fragment.xml file nor annotated with
    WebListener. For example, a
    ServletContextListener defined in a TLD would not be able to
    use this method.ServletException - TODOFilterRegistration getFilterRegistration(String filterName)
filterName - TODOUnsupportedOperationException - If called from a
    ServletContextListener.contextInitialized(ServletContextEvent)
    method of a ServletContextListener that was not defined in a
    web.xml file, a web-fragment.xml file nor annotated with
    WebListener. For example, a
    ServletContextListener defined in a TLD would not be able to
    use this method.Map<String,? extends FilterRegistration> getFilterRegistrations()
UnsupportedOperationException - If called from a
    ServletContextListener.contextInitialized(ServletContextEvent)
    method of a ServletContextListener that was not defined in a
    web.xml file, a web-fragment.xml file nor annotated with
    WebListener. For example, a
    ServletContextListener defined in a TLD would not be able to
    use this method.SessionCookieConfig getSessionCookieConfig()
UnsupportedOperationException - If called from a
    ServletContextListener.contextInitialized(ServletContextEvent)
    method of a ServletContextListener that was not defined in a
    web.xml file, a web-fragment.xml file nor annotated with
    WebListener. For example, a
    ServletContextListener defined in a TLD would not be able to
    use this method.void setSessionTrackingModes(Set<SessionTrackingMode> sessionTrackingModes)
sessionTrackingModes - The session tracking modes to use for this
        web applicationIllegalArgumentException - If sessionTrackingModes specifies
             SessionTrackingMode.SSL in combination with any other
             SessionTrackingModeIllegalStateException - If the context has already been initialisedUnsupportedOperationException - If called from a
    ServletContextListener.contextInitialized(ServletContextEvent)
    method of a ServletContextListener that was not defined in a
    web.xml file, a web-fragment.xml file nor annotated with
    WebListener. For example, a
    ServletContextListener defined in a TLD would not be able to
    use this method.Set<SessionTrackingMode> getDefaultSessionTrackingModes()
SessionTrackingMode.URL is always supported, SessionTrackingMode.COOKIE is supported unless the cookies
 attribute has been set to false for the context and SessionTrackingMode.SSL is supported if at least one of the connectors
 used by this context has the attribute secure set to
 true.UnsupportedOperationException - If called from a
    ServletContextListener.contextInitialized(ServletContextEvent)
    method of a ServletContextListener that was not defined in a
    web.xml file, a web-fragment.xml file nor annotated with
    WebListener. For example, a
    ServletContextListener defined in a TLD would not be able to
    use this method.Set<SessionTrackingMode> getEffectiveSessionTrackingModes()
setSessionTrackingModes(Set) if
         one was previously set, else return the defaultsUnsupportedOperationException - If called from a
    ServletContextListener.contextInitialized(ServletContextEvent)
    method of a ServletContextListener that was not defined in a
    web.xml file, a web-fragment.xml file nor annotated with
    WebListener. For example, a
    ServletContextListener defined in a TLD would not be able to
    use this method.void addListener(String className)
className - TODOUnsupportedOperationException - If called from a
    ServletContextListener.contextInitialized(ServletContextEvent)
    method of a ServletContextListener that was not defined in a
    web.xml file, a web-fragment.xml file nor annotated with
    WebListener. For example, a
    ServletContextListener defined in a TLD would not be able to
    use this method.<T extends EventListener> void addListener(T t)
T - TODOt - TODOUnsupportedOperationException - If called from a
    ServletContextListener.contextInitialized(ServletContextEvent)
    method of a ServletContextListener that was not defined in a
    web.xml file, a web-fragment.xml file nor annotated with
    WebListener. For example, a
    ServletContextListener defined in a TLD would not be able to
    use this method.void addListener(Class<? extends EventListener> listenerClass)
listenerClass - TODOUnsupportedOperationException - If called from a
    ServletContextListener.contextInitialized(ServletContextEvent)
    method of a ServletContextListener that was not defined in a
    web.xml file, a web-fragment.xml file nor annotated with
    WebListener. For example, a
    ServletContextListener defined in a TLD would not be able to
    use this method.<T extends EventListener> T createListener(Class<T> c) throws ServletException
T - TODOc - TODOServletException - TODOUnsupportedOperationException - If called from a
    ServletContextListener.contextInitialized(ServletContextEvent)
    method of a ServletContextListener that was not defined in a
    web.xml file, a web-fragment.xml file nor annotated with
    WebListener. For example, a
    ServletContextListener defined in a TLD would not be able to
    use this method.JspConfigDescriptor getJspConfigDescriptor()
UnsupportedOperationException - If called from a
    ServletContextListener.contextInitialized(ServletContextEvent)
    method of a ServletContextListener that was not defined in a
    web.xml file, a web-fragment.xml file nor annotated with
    WebListener. For example, a
    ServletContextListener defined in a TLD would not be able to
    use this method.ClassLoader getClassLoader()
UnsupportedOperationException - If called from a
    ServletContextListener.contextInitialized(ServletContextEvent)
    method of a ServletContextListener that was not defined in a
    web.xml file, a web-fragment.xml file nor annotated with
    WebListener. For example, a
    ServletContextListener defined in a TLD would not be able to
    use this method.SecurityException - if access to the class loader is prevented by a
         SecurityManagervoid declareRoles(String... roleNames)
roleNames - The roles to addUnsupportedOperationException - If called from a
    ServletContextListener.contextInitialized(ServletContextEvent)
    method of a ServletContextListener that was not defined in a
    web.xml file, a web-fragment.xml file nor annotated with
    WebListener. For example, a
    ServletContextListener defined in a TLD would not be able to
    use this method.IllegalArgumentException - If the list of roleNames is null or
         emptyIllegalStateException - If the ServletContext has already been
         initialisedCopyright © 2000-2020 Apache Software Foundation. All Rights Reserved.