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ServletContext.java
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ServletContext.java
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/*
* Copyright (c) 1997, 2023 Oracle and/or its affiliates and others.
* All rights reserved.
* Copyright 2004 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package jakarta.servlet;
import jakarta.servlet.descriptor.JspConfigDescriptor;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.nio.charset.Charset;
import java.util.Enumeration;
import java.util.EventListener;
import java.util.Map;
import java.util.Set;
/**
* Defines a set of methods that a servlet uses to communicate with its servlet container, for example, to get the MIME
* type of a file, dispatch requests, or write to a log file.
*
* <p>
* 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 <code>/catalog</code> and
* possibly installed via a <code>.war</code> file.)
*
* <p>
* 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.
*
* <p>
* The <code>ServletContext</code> object is contained within the {@link ServletConfig} object, which the Web server
* provides the servlet when the servlet is initialized.
*
* @author Various
*
* @see Servlet#getServletConfig
* @see ServletConfig#getServletContext
*/
public interface ServletContext {
/**
* The name of the <tt>ServletContext</tt> attribute which stores the private temporary directory (of type
* <tt>java.io.File</tt>) provided by the servlet container for the <tt>ServletContext</tt>
*/
public static final String TEMPDIR = "jakarta.servlet.context.tempdir";
/**
* The name of the <code>ServletContext</code> attribute whose value (of type
* <code>java.util.List<java.lang.String></code>) contains the list of names of JAR files in
* <code>WEB-INF/lib</code> ordered by their web fragment names (with possible exclusions if
* <code><absolute-ordering></code> without any <code><others/></code> is being used), or null if no
* absolute or relative ordering has been specified
*
* @since Servlet 3.0
*/
public static final String ORDERED_LIBS = "jakarta.servlet.context.orderedLibs";
/**
* Returns the context path of the web application.
*
* <p>
* The context path is the portion of the request URI that is used to select the context of the request. The context
* path always comes first in a request URI. If this context is the "root" context rooted at the base of the Web
* server's URL name space, this path will be an empty string. Otherwise, if the context is not rooted at the root of
* the server's name space, the path starts with a / character but does not end with a / character.
*
* <p>
* It is possible that a servlet container may match a context by more than one context path. In such cases the
* {@link jakarta.servlet.http.HttpServletRequest#getContextPath()} will return the actual context path used by the
* request and it may differ from the path returned by this method. The context path returned by this method should be
* considered as the prime or preferred context path of the application.
*
* @return The context path of the web application, or "" for the root context
*
* @see jakarta.servlet.http.HttpServletRequest#getContextPath()
*
* @since Servlet 2.5
*/
public String getContextPath();
/**
* Returns a <code>ServletContext</code> object that corresponds to a specified URL on the server.
*
* <p>
* This method allows servlets to gain access to the context for various parts of the server, and as needed obtain
* {@link RequestDispatcher} objects from the context. The given path must be begin with <tt>/</tt>, is interpreted
* relative to the server's document root and is matched against the context roots of other web applications hosted on
* this container.
*
* <p>
* In a security conscious environment, the servlet container may return <code>null</code> for a given URL.
*
* @param uripath a <code>String</code> specifying the context path of another web application in the container.
* @return the <code>ServletContext</code> object that corresponds to the named URL, or null if either none exists or
* the container wishes to restrict this access.
*
* @see RequestDispatcher
*/
public ServletContext getContext(String uripath);
/**
* Returns the major version of Jakarta Servlet specification that this container supports. All implementations that
* comply with version X.Y of the specification, must return the integer X.
*
* @return The major version of Jakarta Servlet specification that this container supports
*/
public int getMajorVersion();
/**
* Returns the minor version of Jakarta Servlet specification that this container supports. All implementations that
* comply with version X.Y of the specification, must return the integer Y.
*
* @return The minor version of Jakarta Servlet specification that this container supports
*/
public int getMinorVersion();
/**
* Gets the major version of the Servlet specification that the application represented by this ServletContext is based
* on.
*
* <p>
* The value returned may be different from {@link #getMajorVersion}, which returns the major version of the Servlet
* specification supported by the Servlet container.
*
* @return the major version of the Servlet specification that the application represented by this ServletContext is
* based on
*
* @since Servlet 3.0
*/
public int getEffectiveMajorVersion();
/**
* Gets the minor version of the Servlet specification that the application represented by this ServletContext is based
* on.
*
* <p>
* The value returned may be different from {@link #getMinorVersion}, which returns the minor version of the Servlet
* specification supported by the Servlet container.
*
* @return the minor version of the Servlet specification that the application represented by this ServletContext is
* based on
*
* @since Servlet 3.0
*/
public int getEffectiveMinorVersion();
/**
* Returns the MIME type of the specified file, or <code>null</code> 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 include <code>text/html</code> and <code>image/gif</code>.
*
* @param file a <code>String</code> specifying the name of a file
*
* @return a <code>String</code> specifying the file's MIME type
*/
public String getMimeType(String file);
/**
* Returns a directory-like listing of all the paths to resources within the web application whose longest sub-path
* matches the supplied path argument.
*
* <p>
* Paths indicating subdirectory paths end with a <tt>/</tt>.
*
* <p>
* The returned paths are all relative to the root of the web application, or relative to the
* <tt>/META-INF/resources</tt> directory of a JAR file inside the web application's <tt>/WEB-INF/lib</tt> directory,
* and have a leading <tt>/</tt>.
*
* <p>
* The returned set is not backed by the {@code ServletContext} object, so changes in the returned set are not reflected
* in the {@code ServletContext} object, and vice-versa.
* </p>
*
* <p>
* For example, for a web application containing:
*
* <pre>
* {@code
* /welcome.html
* /catalog/index.html
* /catalog/products.html
* /catalog/offers/books.html
* /catalog/offers/music.html
* /customer/login.jsp
* /WEB-INF/web.xml
* /WEB-INF/classes/com.acme.OrderServlet.class
* /WEB-INF/lib/catalog.jar!/META-INF/resources/catalog/moreOffers/books.html
* }
* </pre>
*
* <tt>getResourcePaths("/")</tt> would return <tt>{"/welcome.html", "/catalog/", "/customer/", "/WEB-INF/"}</tt>, and
* <tt>getResourcePaths("/catalog/")</tt> would return <tt>{"/catalog/index.html", "/catalog/products.html",
* "/catalog/offers/", "/catalog/moreOffers/"}</tt>.
*
* <p>
* This method bypasses both implicit (no direct access to WEB-INF or META-INF) and explicit (defined by the web
* application) security constraints. Care should be taken both when constructing the path (e.g. avoid unsanitized user
* provided data) and when using the result not to create a security vulnerability in the application.
*
* <p>
* The provided {@code path} parameter is canonicalized as per <a href=
* "https://jakarta.ee/specifications/servlet/6.0/jakarta-servlet-spec-6.0.html#uri-path-canonicalization">Servlet 6.0,
* 3.5.2</a> before being used to match resources.
*
* @param path the partial path used to match the resources, which must start with a <tt>/</tt>
* @return a Set containing the directory listing, or null if there are no resources in the web application whose path
* begins with the supplied path.
*
* @since Servlet 2.3
*/
public Set<String> getResourcePaths(String path);
/**
* Returns a URL to the resource that is mapped to the given path.
*
* <p>
* The path must begin with a <tt>/</tt> and is interpreted as relative to the current context root, or relative to the
* <tt>/META-INF/resources</tt> directory of a JAR file inside the web application's <tt>/WEB-INF/lib</tt> directory.
* This method will first search the document root of the web application for the requested resource, before searching
* any of the JAR files inside <tt>/WEB-INF/lib</tt>. The order in which the JAR files inside <tt>/WEB-INF/lib</tt> are
* searched is undefined.
*
* <p>
* 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 <code>.war</code> file.
*
* <p>
* The servlet container must implement the URL handlers and <code>URLConnection</code> objects that are necessary to
* access the resource.
*
* <p>
* This method returns <code>null</code> if no resource is mapped to the pathname.
*
* <p>
* Some containers may allow writing to the URL returned by this method using the methods of the URL class.
*
* <p>
* The resource content is returned directly, so be aware that requesting a <code>.jsp</code> page returns the JSP
* source code. Use a <code>RequestDispatcher</code> instead to include results of an execution.
*
* <p>
* This method has a different purpose than <code>java.lang.Class.getResource</code>, which looks up resources based on
* a class loader. This method does not use class loaders.
*
* <p>
* This method bypasses both implicit (no direct access to WEB-INF or META-INF) and explicit (defined by the web
* application) security constraints. Care should be taken both when constructing the path (e.g. avoid unsanitized user
* provided data) and when using the result not to create a security vulnerability in the application.
*
* <p>
* The provided {@code path} parameter is canonicalized as per <a href=
* "https://jakarta.ee/specifications/servlet/6.0/jakarta-servlet-spec-6.0.html#uri-path-canonicalization">Servlet 6.0,
* 3.5.2</a> before being used to match resources.
*
* @param path a <code>String</code> specifying the path to the resource
*
* @return the resource located at the named path, or <code>null</code> if there is no resource at that path
*
* @exception MalformedURLException if the pathname is not given in the correct form
*/
public URL getResource(String path) throws MalformedURLException;
/**
* Returns the resource located at the named path as an <code>InputStream</code> object.
*
* <p>
* The data in the <code>InputStream</code> can be of any type or length. The path must be specified according to the
* rules given in <code>getResource</code>. This method returns <code>null</code> if no resource exists at the specified
* path.
*
* <p>
* Meta-information such as content length and content type that is available via <code>getResource</code> method is
* lost when using this method.
*
* <p>
* The servlet container must implement the URL handlers and <code>URLConnection</code> objects necessary to access the
* resource.
*
* <p>
* This method is different from <code>java.lang.Class.getResourceAsStream</code>, 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.
*
* <p>
* This method bypasses both implicit (no direct access to WEB-INF or META-INF) and explicit (defined by the web
* application) security constraints. Care should be taken both when constructing the path (e.g. avoid unsanitized user
* provided data) and when using the result not to create a security vulnerability in the application.
*
* <p>
* The provided {@code path} parameter is canonicalized as per <a href=
* "https://jakarta.ee/specifications/servlet/6.0/jakarta-servlet-spec-6.0.html#uri-path-canonicalization">Servlet 6.0,
* 3.5.2</a> before being used to match resources.
*
* @param path a <code>String</code> specifying the path to the resource
*
* @return the <code>InputStream</code> returned to the servlet, or <code>null</code> if no resource exists at the
* specified path
*/
public InputStream getResourceAsStream(String path);
/**
*
* Returns a {@link RequestDispatcher} object that acts as a wrapper for the resource located at the given path. A
* <code>RequestDispatcher</code> 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.
*
* <p>
* The pathname must begin with a <tt>/</tt> and is interpreted as relative to the current context root. Use
* <code>getContext</code> to obtain a <code>RequestDispatcher</code> for resources in foreign contexts.
*
* <p>
* This method returns <code>null</code> if the <code>ServletContext</code> cannot return a
* <code>RequestDispatcher</code>.
*
* <p>
* This method bypasses both implicit (no direct access to WEB-INF or META-INF) and explicit (defined by the web
* application) security constraints. Care should be taken both when constructing the path (e.g. avoid unsanitized user
* provided data) and when using the result not to create a security vulnerability in the application.
*
* <p>
* The provided {@code path} parameter is canonicalized as per <a href=
* "https://jakarta.ee/specifications/servlet/6.0/jakarta-servlet-spec-6.0.html#uri-path-canonicalization">Servlet 6.0,
* 3.5.2</a> before being used to match resources.
*
* @param path a <code>String</code> specifying the pathname to the resource
*
* @return a <code>RequestDispatcher</code> object that acts as a wrapper for the resource at the specified path, or
* <code>null</code> if the <code>ServletContext</code> cannot return a <code>RequestDispatcher</code>
*
* @see RequestDispatcher
* @see ServletContext#getContext
*/
public RequestDispatcher getRequestDispatcher(String path);
/**
* Returns a {@link RequestDispatcher} object that acts as a wrapper for the named servlet.
*
* <p>
* 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 {@link ServletConfig#getServletName}.
*
* <p>
* This method returns <code>null</code> if the <code>ServletContext</code> cannot return a
* <code>RequestDispatcher</code> for any reason.
*
* @param name a <code>String</code> specifying the name of a servlet to wrap
*
* @return a <code>RequestDispatcher</code> object that acts as a wrapper for the named servlet, or <code>null</code> if
* the <code>ServletContext</code> cannot return a <code>RequestDispatcher</code>
*
* @see RequestDispatcher
* @see ServletContext#getContext
* @see ServletConfig#getServletName
*/
public RequestDispatcher getNamedDispatcher(String name);
/**
*
* Writes the specified message to a servlet log file, usually an event log. The name and type of the servlet log file
* is specific to the servlet container.
*
* @param msg a <code>String</code> specifying the message to be written to the log file
*/
public void log(String msg);
/**
* Writes an explanatory message and a stack trace for a given <code>Throwable</code> 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.
*
* @param message a <code>String</code> that describes the error or exception
*
* @param throwable the <code>Throwable</code> error or exception
*/
public void log(String message, Throwable throwable);
/**
* Gets the <i>real</i> path corresponding to the given <i>virtual</i> path.
*
* <p>
* The path should begin with a <tt>/</tt> and is interpreted as relative to the current context root. If the path does
* not begin with a <tt>/</tt>, the container will behave as if the method was called with <tt>/</tt> appended to the
* beginning of the provided path.
*
* <p>
* For example, if <tt>path</tt> is equal to <tt>/index.html</tt>, this method will return the absolute file path on the
* server's filesystem to which a request of the form
* <tt>http://<host>:<port>/<contextPath>/index.html</tt> would be mapped, where
* <tt><contextPath></tt> corresponds to the context path of this ServletContext.
*
* <p>
* 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.
*
* <p>
* Resources inside the <tt>/META-INF/resources</tt> directories of JAR files bundled in the application's
* <tt>/WEB-INF/lib</tt> directory must be considered only if the container has unpacked them from their containing JAR
* file, in which case the path to the unpacked location must be returned.
*
* <p>
* This method returns <code>null</code> if the servlet container is unable to translate the given <i>virtual</i> path
* to a <i>real</i> path.
*
* <p>
* This method bypasses both implicit (no direct access to WEB-INF or META-INF) and explicit (defined by the web
* application) security constraints. Care should be taken both when constructing the path (e.g. avoid unsanitized user
* provided data) and when using the result not to create a security vulnerability in the application.
*
* <p>
* The provided {@code path} parameter is canonicalized as per <a href=
* "https://jakarta.ee/specifications/servlet/6.0/jakarta-servlet-spec-6.0.html#uri-path-canonicalization">Servlet 6.0,
* 3.5.2</a> before being used to match resources.
*
* @param path the <i>virtual</i> path to be translated to a <i>real</i> path
*
* @return the <i>real</i> path, or <tt>null</tt> if the translation cannot be performed
*/
public String getRealPath(String path);
/**
* Returns the name and version of the servlet container on which the servlet is running.
*
* <p>
* The form of the returned string is <i>servername</i>/<i>versionnumber</i>. For example, the JavaServer Web
* Development Kit may return the string <code>JavaServer Web Dev Kit/1.0</code>.
*
* <p>
* The servlet container may return other optional information after the primary string in parentheses, for example,
* <code>JavaServer Web Dev Kit/1.0 (JDK 1.1.6; Windows NT 4.0 x86)</code>.
*
*
* @return a <code>String</code> containing at least the servlet container name and version number
*/
public String getServerInfo();
/**
* Returns a <code>String</code> containing the value of the named context-wide initialization parameter, or
* <code>null</code> if the parameter does not exist.
*
* <p>
* 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.
*
* @param name a <code>String</code> containing the name of the parameter whose value is requested
*
* @return a <code>String</code> containing the value of the context's initialization parameter, or <code>null</code> if
* the context's initialization parameter does not exist.
*
* @throws NullPointerException if the argument {@code name} is {@code null}
*
* @see ServletConfig#getInitParameter
*/
public String getInitParameter(String name);
/**
* Returns the names of the context's initialization parameters as an <code>Enumeration</code> of <code>String</code>
* objects, or an empty <code>Enumeration</code> if the context has no initialization parameters.
*
* @return an <code>Enumeration</code> of <code>String</code> objects containing the names of the context's
* initialization parameters
*
* @see ServletConfig#getInitParameter
*/
public Enumeration<String> getInitParameterNames();
/**
* Sets the context initialization parameter with the given name and value on this ServletContext.
*
* @param name the name of the context initialization parameter to set
* @param value the value of the context initialization parameter to set
*
* @return true if the context initialization parameter with the given name and value was set successfully on this
* ServletContext, and false if it was not set because this ServletContext already contains a context initialization
* parameter with a matching name
*
* @throws IllegalStateException if this ServletContext has already been initialized
*
* @throws NullPointerException if the name parameter is {@code null}
*
* @throws UnsupportedOperationException if this ServletContext was passed to the
* {@link ServletContextListener#contextInitialized} method of a {@link ServletContextListener} that was neither
* declared in <code>web.xml</code> or <code>web-fragment.xml</code>, nor annotated with
* {@link jakarta.servlet.annotation.WebListener}
*
* @since Servlet 3.0
*/
public boolean setInitParameter(String name, String value);
/**
* Returns the servlet container attribute with the given name, or <code>null</code> if there is no attribute by that
* name.
*
* <p>
* 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 <code>getAttributeNames</code>.
*
* <p>
* The attribute is returned as a <code>java.lang.Object</code> or some subclass.
*
* <p>
* Attribute names should follow the same convention as package names. The Jakarta Servlet specification reserves names
* matching <code>java.*</code>, <code>javax.*</code>, and <code>sun.*</code>.
*
* @param name a <code>String</code> specifying the name of the attribute
*
* @return an <code>Object</code> containing the value of the attribute, or <code>null</code> if no attribute exists
* matching the given name.
*
* @see ServletContext#getAttributeNames
*
* @throws NullPointerException if the argument {@code name} is {@code null}
*
*/
public Object getAttribute(String name);
/**
* Returns an <code>Enumeration</code> containing the attribute names available within this ServletContext.
*
* <p>
* Use the {@link #getAttribute} method with an attribute name to get the value of an attribute.
*
* @return an <code>Enumeration</code> of attribute names
*
* @see #getAttribute
*/
public Enumeration<String> getAttributeNames();
/**
* Binds an object to a given attribute name in this ServletContext. If the name specified is already used for an
* attribute, this method will replace the attribute with the new to the new attribute.
* <p>
* If listeners are configured on the <code>ServletContext</code> the container notifies them accordingly.
* <p>
* If a null value is passed, the effect is the same as calling <code>removeAttribute()</code>.
*
* <p>
* Attribute names should follow the same convention as package names. The Jakarta Servlet specification reserves names
* matching <code>java.*</code>, <code>javax.*</code>, and <code>sun.*</code>.
*
* @param name a <code>String</code> specifying the name of the attribute
*
* @param object an <code>Object</code> representing the attribute to be bound
*
* @throws NullPointerException if the name parameter is {@code null}
*
*/
public void setAttribute(String name, Object object);
/**
* Removes the attribute with the given name from this ServletContext. After removal, subsequent calls to
* {@link #getAttribute} to retrieve the attribute's value will return <code>null</code>.
*
* <p>
* If listeners are configured on the <code>ServletContext</code> the container notifies them accordingly.
*
* @param name a <code>String</code> specifying the name of the attribute to be removed
*/
public void removeAttribute(String name);
/**
* 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.
*
* @return The name of the web application or null if no name has been declared in the deployment descriptor.
*
* @since Servlet 2.3
*/
public String getServletContextName();
/**
* Adds the servlet with the given name and class name to this servlet context.
*
* <p>
* The registered servlet may be further configured via the returned {@link ServletRegistration} object.
*
* <p>
* The specified <tt>className</tt> will be loaded using the classloader associated with the application represented by
* this ServletContext.
*
* <p>
* If this ServletContext already contains a preliminary ServletRegistration for a servlet with the given
* <tt>servletName</tt>, it will be completed (by assigning the given <tt>className</tt> to it) and returned.
*
* <p>
* This method introspects the class with the given <tt>className</tt> for the
* {@link jakarta.servlet.annotation.ServletSecurity}, {@link jakarta.servlet.annotation.MultipartConfig},
* <tt>jakarta.annotation.security.RunAs</tt>, and <tt>jakarta.annotation.security.DeclareRoles</tt> annotations. In
* addition, this method supports resource injection if the class with the given <tt>className</tt> represents a Managed
* Bean. See the Jakarta EE platform and CDI specifications for additional details about Managed Beans and resource
* injection.
*
* @param servletName the name of the servlet
* @param className the fully qualified class name of the servlet
*
* @return a ServletRegistration object that may be used to further configure the registered servlet, or <tt>null</tt>
* if this ServletContext already contains a complete ServletRegistration for a servlet with the given
* <tt>servletName</tt>
*
* @throws IllegalStateException if this ServletContext has already been initialized
*
* @throws IllegalArgumentException if <code>servletName</code> is null or an empty String
*
* @throws UnsupportedOperationException if this ServletContext was passed to the
* {@link ServletContextListener#contextInitialized} method of a {@link ServletContextListener} that was neither
* declared in <code>web.xml</code> or <code>web-fragment.xml</code>, nor annotated with
* {@link jakarta.servlet.annotation.WebListener}
*
* @since Servlet 3.0
*/
public ServletRegistration.Dynamic addServlet(String servletName, String className);
/**
* Registers the given servlet instance with this ServletContext under the given <tt>servletName</tt>.
*
* <p>
* The registered servlet may be further configured via the returned {@link ServletRegistration} object.
*
* <p>
* If this ServletContext already contains a preliminary ServletRegistration for a servlet with the given
* <tt>servletName</tt>, it will be completed (by assigning the class name of the given servlet instance to it) and
* returned.
*
* @param servletName the name of the servlet
* @param servlet the servlet instance to register
*
* @return a ServletRegistration object that may be used to further configure the given servlet, or <tt>null</tt> if
* this ServletContext already contains a complete ServletRegistration for a servlet with the given <tt>servletName</tt>
* or if the same servlet instance has already been registered with this or another ServletContext in the same container
*
* @throws IllegalStateException if this ServletContext has already been initialized
*
* @throws UnsupportedOperationException if this ServletContext was passed to the
* {@link ServletContextListener#contextInitialized} method of a {@link ServletContextListener} that was neither
* declared in <code>web.xml</code> or <code>web-fragment.xml</code>, nor annotated with
* {@link jakarta.servlet.annotation.WebListener}
*
* @throws IllegalArgumentException if <code>servletName</code> is null or an empty String
*
* @since Servlet 3.0
*/
public ServletRegistration.Dynamic addServlet(String servletName, Servlet servlet);
/**
* Adds the servlet with the given name and class type to this servlet context.
*
* <p>
* The registered servlet may be further configured via the returned {@link ServletRegistration} object.
*
* <p>
* If this ServletContext already contains a preliminary ServletRegistration for a servlet with the given
* <tt>servletName</tt>, it will be completed (by assigning the name of the given <tt>servletClass</tt> to it) and
* returned.
*
* <p>
* This method introspects the given <tt>servletClass</tt> for the {@link jakarta.servlet.annotation.ServletSecurity},
* {@link jakarta.servlet.annotation.MultipartConfig}, <tt>jakarta.annotation.security.RunAs</tt>, and
* <tt>jakarta.annotation.security.DeclareRoles</tt> annotations. In addition, this method supports resource injection
* if the given <tt>servletClass</tt> represents a Managed Bean. See the Jakarta EE platform and CDI specifications for
* additional details about Managed Beans and resource injection.
*
* @param servletName the name of the servlet
* @param servletClass the class object from which the servlet will be instantiated
*
* @return a ServletRegistration object that may be used to further configure the registered servlet, or <tt>null</tt>
* if this ServletContext already contains a complete ServletRegistration for the given <tt>servletName</tt>
*
* @throws IllegalStateException if this ServletContext has already been initialized
*
* @throws IllegalArgumentException if <code>servletName</code> is null or an empty String
*
* @throws UnsupportedOperationException if this ServletContext was passed to the
* {@link ServletContextListener#contextInitialized} method of a {@link ServletContextListener} that was neither
* declared in <code>web.xml</code> or <code>web-fragment.xml</code>, nor annotated with
* {@link jakarta.servlet.annotation.WebListener}
*
* @since Servlet 3.0
*/
public ServletRegistration.Dynamic addServlet(String servletName, Class<? extends Servlet> servletClass);
/**
* Adds the servlet with the given jsp file to this servlet context.
*
* <p>
* The registered servlet may be further configured via the returned {@link ServletRegistration} object.
*
* <p>
* If this ServletContext already contains a preliminary ServletRegistration for a servlet with the given
* <tt>servletName</tt>, it will be completed (by assigning the given <tt>jspFile</tt> to it) and returned.
*
* @param servletName the name of the servlet
* @param jspFile the full path to a JSP file within the web application beginning with a `/'.
*
* @return a ServletRegistration object that may be used to further configure the registered servlet, or <tt>null</tt>
* if this ServletContext already contains a complete ServletRegistration for a servlet with the given
* <tt>servletName</tt>
*
* @throws IllegalStateException if this ServletContext has already been initialized
*
* @throws IllegalArgumentException if <code>servletName</code> is null or an empty String
*
* @throws UnsupportedOperationException if this ServletContext was passed to the
* {@link ServletContextListener#contextInitialized} method of a {@link ServletContextListener} that was neither
* declared in <code>web.xml</code> or <code>web-fragment.xml</code>, nor annotated with
* {@link jakarta.servlet.annotation.WebListener}
*
* @since Servlet 4.0
*/
public ServletRegistration.Dynamic addJspFile(String servletName, String jspFile);
/**
* Instantiates the given Servlet class.
*
* <p>
* The returned Servlet instance may be further customized before it is registered with this ServletContext via a call
* to {@link #addServlet(String,Servlet)}.
*
* <p>
* The given Servlet class must define a zero argument constructor, which is used to instantiate it.
*
* <p>
* This method introspects the given <tt>clazz</tt> for the following annotations:
* {@link jakarta.servlet.annotation.ServletSecurity}, {@link jakarta.servlet.annotation.MultipartConfig},
* <tt>jakarta.annotation.security.RunAs</tt>, and <tt>jakarta.annotation.security.DeclareRoles</tt>. In addition, this
* method supports resource injection if the given <tt>clazz</tt> represents a Managed Bean. See the Jakarta EE platform
* and CDI specifications for additional details about Managed Beans and resource injection.
*
* @param <T> the class of the Servlet to create
* @param clazz the Servlet class to instantiate
*
* @return the new Servlet instance
*
* @throws ServletException if the given <tt>clazz</tt> fails to be instantiated
*
* @throws UnsupportedOperationException if this ServletContext was passed to the
* {@link ServletContextListener#contextInitialized} method of a {@link ServletContextListener} that was neither
* declared in <code>web.xml</code> or <code>web-fragment.xml</code>, nor annotated with
* {@link jakarta.servlet.annotation.WebListener}
*
* @since Servlet 3.0
*/
public <T extends Servlet> T createServlet(Class<T> clazz) throws ServletException;
/**
* Gets the ServletRegistration corresponding to the servlet with the given <tt>servletName</tt>.
*
* @param servletName the name of a servlet
*
* @return the (complete or preliminary) ServletRegistration for the servlet with the given <tt>servletName</tt>, or
* null if no ServletRegistration exists under that name
*
* @throws UnsupportedOperationException if this ServletContext was passed to the
* {@link ServletContextListener#contextInitialized} method of a {@link ServletContextListener} that was neither
* declared in <code>web.xml</code> or <code>web-fragment.xml</code>, nor annotated with
* {@link jakarta.servlet.annotation.WebListener}
*
* @since Servlet 3.0
*/
public ServletRegistration getServletRegistration(String servletName);
/**
* Gets a (possibly empty) Map of the ServletRegistration objects (keyed by servlet name) corresponding to all servlets
* registered with this ServletContext.
*
* <p>
* The returned Map includes the ServletRegistration objects corresponding to all declared and annotated servlets, as
* well as the ServletRegistration objects corresponding to all servlets that have been added via one of the
* <tt>addServlet</tt> and <tt>addJspFile</tt> methods.
*
* <p>
* If permitted, any changes to the returned Map must not affect this ServletContext.
*
* @return Map of the (complete and preliminary) ServletRegistration objects corresponding to all servlets currently
* registered with this ServletContext
*
* @throws UnsupportedOperationException if this ServletContext was passed to the
* {@link ServletContextListener#contextInitialized} method of a {@link ServletContextListener} that was neither
* declared in <code>web.xml</code> or <code>web-fragment.xml</code>, nor annotated with
* {@link jakarta.servlet.annotation.WebListener}
*
* @since Servlet 3.0
*/
public Map<String, ? extends ServletRegistration> getServletRegistrations();
/**
* Adds the filter with the given name and class name to this servlet context.
*
* <p>
* The registered filter may be further configured via the returned {@link FilterRegistration} object.
*
* <p>
* The specified <tt>className</tt> will be loaded using the classloader associated with the application represented by
* this ServletContext.
*
* <p>
* If this ServletContext already contains a preliminary FilterRegistration for a filter with the given
* <tt>filterName</tt>, it will be completed (by assigning the given <tt>className</tt> to it) and returned.
*
* <p>
* This method supports resource injection if the class with the given <tt>className</tt> represents a Managed Bean. See
* the Jakarta EE platform and CDI specifications for additional details about Managed Beans and resource injection.
*
* @param filterName the name of the filter
* @param className the fully qualified class name of the filter
*
* @return a FilterRegistration object that may be used to further configure the registered filter, or <tt>null</tt> if
* this ServletContext already contains a complete FilterRegistration for a filter with the given <tt>filterName</tt>
*
* @throws IllegalStateException if this ServletContext has already been initialized
*
* @throws IllegalArgumentException if <code>filterName</code> is null or an empty String
*
* @throws UnsupportedOperationException if this ServletContext was passed to the
* {@link ServletContextListener#contextInitialized} method of a {@link ServletContextListener} that was neither
* declared in <code>web.xml</code> or <code>web-fragment.xml</code>, nor annotated with
* {@link jakarta.servlet.annotation.WebListener}
*
* @since Servlet 3.0
*/
public FilterRegistration.Dynamic addFilter(String filterName, String className);
/**
* Registers the given filter instance with this ServletContext under the given <tt>filterName</tt>.
*
* <p>
* The registered filter may be further configured via the returned {@link FilterRegistration} object.
*
* <p>
* If this ServletContext already contains a preliminary FilterRegistration for a filter with the given
* <tt>filterName</tt>, it will be completed (by assigning the class name of the given filter instance to it) and
* returned.
*
* @param filterName the name of the filter
* @param filter the filter instance to register
*
* @return a FilterRegistration object that may be used to further configure the given filter, or <tt>null</tt> if this
* ServletContext already contains a complete FilterRegistration for a filter with the given <tt>filterName</tt> or if
* the same filter instance has already been registered with this or another ServletContext in the same container
*
* @throws IllegalStateException if this ServletContext has already been initialized
*
* @throws IllegalArgumentException if <code>filterName</code> is null or an empty String
*
* @throws UnsupportedOperationException if this ServletContext was passed to the
* {@link ServletContextListener#contextInitialized} method of a {@link ServletContextListener} that was neither
* declared in <code>web.xml</code> or <code>web-fragment.xml</code>, nor annotated with
* {@link jakarta.servlet.annotation.WebListener}
*
* @since Servlet 3.0
*/
public FilterRegistration.Dynamic addFilter(String filterName, Filter filter);
/**
* Adds the filter with the given name and class type to this servlet context.
*
* <p>
* The registered filter may be further configured via the returned {@link FilterRegistration} object.
*
* <p>
* If this ServletContext already contains a preliminary FilterRegistration for a filter with the given
* <tt>filterName</tt>, it will be completed (by assigning the name of the given <tt>filterClass</tt> to it) and
* returned.
*
* <p>
* This method supports resource injection if the given <tt>filterClass</tt> represents a Managed Bean. See the Jakarta
* EE platform and CDI specifications for additional details about Managed Beans and resource injection.
*
* @param filterName the name of the filter
* @param filterClass the class object from which the filter will be instantiated
*
* @return a FilterRegistration object that may be used to further configure the registered filter, or <tt>null</tt> if
* this ServletContext already contains a complete FilterRegistration for a filter with the given <tt>filterName</tt>
*
* @throws IllegalStateException if this ServletContext has already been initialized
*
* @throws IllegalArgumentException if <code>filterName</code> is null or an empty String
*
* @throws UnsupportedOperationException if this ServletContext was passed to the
* {@link ServletContextListener#contextInitialized} method of a {@link ServletContextListener} that was neither
* declared in <code>web.xml</code> or <code>web-fragment.xml</code>, nor annotated with
* {@link jakarta.servlet.annotation.WebListener}
*
* @since Servlet 3.0
*/
public FilterRegistration.Dynamic addFilter(String filterName, Class<? extends Filter> filterClass);
/**
* Instantiates the given Filter class.
*
* <p>
* The returned Filter instance may be further customized before it is registered with this ServletContext via a call to
* {@link #addFilter(String,Filter)}.
*
* <p>
* The given Filter class must define a zero argument constructor, which is used to instantiate it.
*
* <p>
* This method supports resource injection if the given <tt>clazz</tt> represents a Managed Bean. See the Jakarta EE
* platform and CDI specifications for additional details about Managed Beans and resource injection.
*
* @param <T> the class of the Filter to create
* @param clazz the Filter class to instantiate
*
* @return the new Filter instance
*
* @throws ServletException if the given <tt>clazz</tt> fails to be instantiated
*
* @throws UnsupportedOperationException if this ServletContext was passed to the
* {@link ServletContextListener#contextInitialized} method of a {@link ServletContextListener} that was neither
* declared in <code>web.xml</code> or <code>web-fragment.xml</code>, nor annotated with
* {@link jakarta.servlet.annotation.WebListener}
*
* @since Servlet 3.0
*/
public <T extends Filter> T createFilter(Class<T> clazz) throws ServletException;
/**
* Gets the FilterRegistration corresponding to the filter with the given <tt>filterName</tt>.
*
* @param filterName the name of a filter
* @return the (complete or preliminary) FilterRegistration for the filter with the given <tt>filterName</tt>, or null
* if no FilterRegistration exists under that name
*
* @throws UnsupportedOperationException if this ServletContext was passed to the
* {@link ServletContextListener#contextInitialized} method of a {@link ServletContextListener} that was neither
* declared in <code>web.xml</code> or <code>web-fragment.xml</code>, nor annotated with
* {@link jakarta.servlet.annotation.WebListener}
*
* @since Servlet 3.0
*/
public FilterRegistration getFilterRegistration(String filterName);
/**
* Gets a (possibly empty) Map of the FilterRegistration objects (keyed by filter name) corresponding to all filters
* registered with this ServletContext.
*
* <p>
* The returned Map includes the FilterRegistration objects corresponding to all declared and annotated filters, as well
* as the FilterRegistration objects corresponding to all filters that have been added via one of the <tt>addFilter</tt>
* methods.
*
* <p>
* Any changes to the returned Map must not affect this ServletContext.
*
* @return Map of the (complete and preliminary) FilterRegistration objects corresponding to all filters currently
* registered with this ServletContext
*
* @throws UnsupportedOperationException if this ServletContext was passed to the
* {@link ServletContextListener#contextInitialized} method of a {@link ServletContextListener} that was neither
* declared in <code>web.xml</code> or <code>web-fragment.xml</code>, nor annotated with
* {@link jakarta.servlet.annotation.WebListener}
*
* @since Servlet 3.0
*/
public Map<String, ? extends FilterRegistration> getFilterRegistrations();
/**
* Gets the {@link SessionCookieConfig} object through which various properties of the session tracking cookies created
* on behalf of this <tt>ServletContext</tt> may be configured.
*
* <p>
* Repeated invocations of this method will return the same <tt>SessionCookieConfig</tt> instance.
*
* @return the <tt>SessionCookieConfig</tt> object through which various properties of the session tracking cookies
* created on behalf of this <tt>ServletContext</tt> may be configured
*
* @throws UnsupportedOperationException if this ServletContext was passed to the
* {@link ServletContextListener#contextInitialized} method of a {@link ServletContextListener} that was neither
* declared in <code>web.xml</code> or <code>web-fragment.xml</code>, nor annotated with
* {@link jakarta.servlet.annotation.WebListener}
*
* @since Servlet 3.0
*/
public SessionCookieConfig getSessionCookieConfig();
/**
* Sets the session tracking modes that are to become effective for this <tt>ServletContext</tt>.
*
* <p>
* The given <tt>sessionTrackingModes</tt> replaces any session tracking modes set by a previous invocation of this
* method on this <tt>ServletContext</tt>.
*
* @param sessionTrackingModes the set of session tracking modes to become effective for this <tt>ServletContext</tt>
*
* @throws IllegalStateException if this ServletContext has already been initialized