001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements. See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership. The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License. You may obtain a copy of the License at
009 *
010 * http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied. See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019
020 package javax.servlet;
021
022 import java.io.InputStream;
023 import java.net.MalformedURLException;
024 import java.net.URL;
025 import java.util.Enumeration;
026 import java.util.EventListener;
027 import java.util.Map;
028 import java.util.Set;
029
030 import javax.servlet.descriptor.JspConfigDescriptor;
031
032
033 /**
034 * Defines a set of methods that a servlet uses to communicate with its
035 * servlet container, for example, to get the MIME type of a file, dispatch
036 * requests, or write to a log file.
037 * <p/>
038 * <p>There is one context per "web application" per Java Virtual Machine. (A
039 * "web application" is a collection of servlets and content installed under a
040 * specific subset of the server's URL namespace such as <code>/catalog</code>
041 * and possibly installed via a <code>.war</code> file.)
042 * <p/>
043 * <p>In the case of a web
044 * application marked "distributed" in its deployment descriptor, there will
045 * be one context instance for each virtual machine. In this situation, the
046 * context cannot be used as a location to share global information (because
047 * the information won't be truly global). Use an external resource like
048 * a database instead.
049 * <p/>
050 * <p>The <code>ServletContext</code> object is contained within
051 * the {@link ServletConfig} object, which the Web server provides the
052 * servlet when the servlet is initialized.
053 *
054 * @version $Rev: 901916 $ $Date: 2010-01-21 18:12:17 -0500 (Thu, 21 Jan 2010) $
055 * @see Servlet#getServletConfig
056 * @see ServletConfig#getServletContext
057 */
058
059 public interface ServletContext {
060
061 /**
062 * @since Servlet 3.0
063 */
064 String ORDERED_LIBS = "javax.servlet.context.orderedLibs";
065 /**
066 * @since Servlet 3.0
067 */
068 String TEMPDIR = "javax.servlet.context.tempdir";
069
070 /**
071 * @return context path for this web app or "" for the / context
072 * @since Servlet 2.5
073 */
074 String getContextPath();
075
076 /**
077 * Returns a <code>ServletContext</code> object that
078 * corresponds to a specified URL on the server.
079 * <p/>
080 * <p>This method allows servlets to gain
081 * access to the context for various parts of the server, and as
082 * needed obtain {@link RequestDispatcher} objects from the context.
083 * The given path must be begin with "/", is interpreted relative
084 * to the server's document root and is matched against the context roots of
085 * other web applications hosted on this container.
086 * <p/>
087 * <p>In a security conscious environment, the servlet container may
088 * return <code>null</code> for a given URL.
089 *
090 * @param uripath a <code>String</code> specifying the context path of
091 * another web application in the container.
092 * @return the <code>ServletContext</code> object that
093 * corresponds to the named URL, or null if either
094 * none exists or the container wishes to restrict
095 * this access.
096 * @see RequestDispatcher
097 */
098 ServletContext getContext(String uripath);
099
100 /**
101 * Returns the major version of the Java Servlet API that this
102 * servlet container supports. All implementations that comply
103 * with Version 3.0 must have this method
104 * return the integer 3.
105 *
106 * @return 3
107 */
108 int getMajorVersion();
109
110 /**
111 * Returns the minor version of the Servlet API that this
112 * servlet container supports. All implementations that comply
113 * with Version 3.0 must have this method
114 * return the integer 0.
115 *
116 * @return 0
117 */
118 int getMinorVersion();
119
120 /**
121 * Returns the MIME type of the specified file, or <code>null</code> if
122 * the MIME type is not known. The MIME type is determined
123 * by the configuration of the servlet container, and may be specified
124 * in a web application deployment descriptor. Common MIME
125 * types are <code>"text/html"</code> and <code>"image/gif"</code>.
126 *
127 * @param file a <code>String</code> specifying the name
128 * of a file
129 * @return a <code>String</code> specifying the file's MIME type
130 */
131 String getMimeType(String file);
132
133 /**
134 * Returns a directory-like listing of all the paths to resources within the web application whose longest sub-path
135 * matches the supplied path argument. Paths indicating subdirectory paths end with a '/'. The returned paths are all
136 * relative to the root of the web application and have a leading '/'. For example, for a web application
137 * containing<br><br>
138 * <p/>
139 * /welcome.html<br>
140 * /catalog/index.html<br>
141 * /catalog/products.html<br>
142 * /catalog/offers/books.html<br>
143 * /catalog/offers/music.html<br>
144 * /customer/login.jsp<br>
145 * /WEB-INF/web.xml<br>
146 * /WEB-INF/classes/com.acme.OrderServlet.class,<br><br>
147 * <p/>
148 * getResourcePaths("/") returns {"/welcome.html", "/catalog/", "/customer/", "/WEB-INF/"}<br>
149 * getResourcePaths("/catalog/") returns {"/catalog/index.html", "/catalog/products.html", "/catalog/offers/"}.<br>
150 *
151 * @param path the partial path used to match the resources,
152 * which must start with a /
153 * @return a Set containing the directory listing, or null if there are no resources in the web application whose path
154 * begins with the supplied path.
155 * @since Servlet 2.3
156 */
157 Set<String> getResourcePaths(String path);
158
159 /**
160 * Returns a URL to the resource that is mapped to a specified
161 * path. The path must begin with a "/" and is interpreted
162 * as relative to the current context root.
163 * <p/>
164 * <p>This method allows the servlet container to make a resource
165 * available to servlets from any source. Resources
166 * can be located on a local or remote
167 * file system, in a database, or in a <code>.war</code> file.
168 * <p/>
169 * <p>The servlet container must implement the URL handlers
170 * and <code>URLConnection</code> objects that are necessary
171 * to access the resource.
172 * <p/>
173 * <p>This method returns <code>null</code>
174 * if no resource is mapped to the pathname.
175 * <p/>
176 * <p>Some containers may allow writing to the URL returned by
177 * this method using the methods of the URL class.
178 * <p/>
179 * <p>The resource content is returned directly, so be aware that
180 * requesting a <code>.jsp</code> page returns the JSP source code.
181 * Use a <code>RequestDispatcher</code> instead to include results of
182 * an execution.
183 * <p/>
184 * <p>This method has a different purpose than
185 * <code>java.lang.Class.getResource</code>,
186 * which looks up resources based on a class loader. This
187 * method does not use class loaders.
188 *
189 * @param path a <code>String</code> specifying
190 * the path to the resource
191 * @return the resource located at the named path,
192 * or <code>null</code> if there is no resource
193 * at that path
194 * @throws MalformedURLException if the pathname is not given in
195 * the correct form
196 */
197 URL getResource(String path) throws MalformedURLException;
198
199 /**
200 * Returns the resource located at the named path as
201 * an <code>InputStream</code> object.
202 * <p/>
203 * <p>The data in the <code>InputStream</code> can be
204 * of any type or length. The path must be specified according
205 * to the rules given in <code>getResource</code>.
206 * This method returns <code>null</code> if no resource exists at
207 * the specified path.
208 * <p/>
209 * <p>Meta-information such as content length and content type
210 * that is available via <code>getResource</code>
211 * method is lost when using this method.
212 * <p/>
213 * <p>The servlet container must implement the URL handlers
214 * and <code>URLConnection</code> objects necessary to access
215 * the resource.
216 * <p/>
217 * <p>This method is different from
218 * <code>java.lang.Class.getResourceAsStream</code>,
219 * which uses a class loader. This method allows servlet containers
220 * to make a resource available
221 * to a servlet from any location, without using a class loader.
222 *
223 * @param path a <code>String</code> specifying the path
224 * to the resource
225 * @return the <code>InputStream</code> returned to the
226 * servlet, or <code>null</code> if no resource
227 * exists at the specified path
228 */
229 InputStream getResourceAsStream(String path);
230
231 /**
232 * Returns a {@link RequestDispatcher} object that acts
233 * as a wrapper for the resource located at the given path.
234 * A <code>RequestDispatcher</code> object can be used to forward
235 * a request to the resource or to include the resource in a response.
236 * The resource can be dynamic or static.
237 * <p/>
238 * <p>The pathname must begin with a "/" and is interpreted as relative
239 * to the current context root. Use <code>getContext</code> to obtain
240 * a <code>RequestDispatcher</code> for resources in foreign contexts.
241 * This method returns <code>null</code> if the <code>ServletContext</code>
242 * cannot return a <code>RequestDispatcher</code>.
243 *
244 * @param path a <code>String</code> specifying the pathname
245 * to the resource
246 * @return a <code>RequestDispatcher</code> object
247 * that acts as a wrapper for the resource
248 * at the specified path, or <code>null</code> if
249 * the <code>ServletContext</code> cannot return
250 * a <code>RequestDispatcher</code>
251 * @see RequestDispatcher
252 * @see ServletContext#getContext
253 */
254 RequestDispatcher getRequestDispatcher(String path);
255
256 /**
257 * Returns a {@link RequestDispatcher} object that acts
258 * as a wrapper for the named servlet.
259 * <p/>
260 * <p>Servlets (and JSP pages also) may be given names via server
261 * administration or via a web application deployment descriptor.
262 * A servlet instance can determine its name using
263 * {@link ServletConfig#getServletName}.
264 * <p/>
265 * <p>This method returns <code>null</code> if the
266 * <code>ServletContext</code>
267 * cannot return a <code>RequestDispatcher</code> for any reason.
268 *
269 * @param name a <code>String</code> specifying the name
270 * of a servlet to wrap
271 * @return a <code>RequestDispatcher</code> object
272 * that acts as a wrapper for the named servlet,
273 * or <code>null</code> if the <code>ServletContext</code>
274 * cannot return a <code>RequestDispatcher</code>
275 * @see RequestDispatcher
276 * @see ServletContext#getContext
277 * @see ServletConfig#getServletName
278 */
279 RequestDispatcher getNamedDispatcher(String name);
280
281 /**
282 * @deprecated As of Java Servlet API 2.1, with no direct replacement.
283 * <p/>
284 * <p>This method was originally defined to retrieve a servlet
285 * from a <code>ServletContext</code>. In this version, this method
286 * always returns <code>null</code> and remains only to preserve
287 * binary compatibility. This method will be permanently removed
288 * in a future version of the Java Servlet API.
289 * <p/>
290 * <p>In lieu of this method, servlets can share information using the
291 * <code>ServletContext</code> class and can perform shared business logic
292 * by invoking methods on common non-servlet classes.
293 */
294 Servlet getServlet(String name) throws ServletException;
295
296 /**
297 * @deprecated As of Java Servlet API 2.0, with no replacement.
298 * <p/>
299 * <p>This method was originally defined to return an <code>Enumeration</code>
300 * of all the servlets known to this servlet context. In this
301 * version, this method always returns an empty enumeration and
302 * remains only to preserve binary compatibility. This method
303 * will be permanently removed in a future version of the Java
304 * Servlet API.
305 */
306 Enumeration<Servlet> getServlets();
307
308 /**
309 * @deprecated As of Java Servlet API 2.1, with no replacement.
310 * <p/>
311 * <p>This method was originally defined to return an
312 * <code>Enumeration</code>
313 * of all the servlet names known to this context. In this version,
314 * this method always returns an empty <code>Enumeration</code> and
315 * remains only to preserve binary compatibility. This method will
316 * be permanently removed in a future version of the Java Servlet API.
317 */
318 Enumeration<String> getServletNames();
319
320 /**
321 * Writes the specified message to a servlet log file, usually
322 * an event log. The name and type of the servlet log file is
323 * specific to the servlet container.
324 *
325 * @param msg a <code>String</code> specifying the
326 * message to be written to the log file
327 */
328 void log(String msg);
329
330 /**
331 * @deprecated As of Java Servlet API 2.1, use
332 * {@link #log(String message, Throwable throwable)}
333 * instead.
334 * <p/>
335 * <p>This method was originally defined to write an
336 * exception's stack trace and an explanatory error message
337 * to the servlet log file.
338 */
339 void log(Exception exception, String msg);
340
341 /**
342 * Writes an explanatory message and a stack trace
343 * for a given <code>Throwable</code> exception
344 * to the servlet log file. The name and type of the servlet log
345 * file is specific to the servlet container, usually an event log.
346 *
347 * @param message a <code>String</code> that
348 * describes the error or exception
349 * @param throwable the <code>Throwable</code> error
350 * or exception
351 */
352 void log(String message, Throwable throwable);
353
354 /**
355 * Returns a <code>String</code> containing the real path
356 * for a given virtual path. For example, the path "/index.html"
357 * returns the absolute file path on the server's filesystem would be
358 * served by a request for "http://host/contextPath/index.html",
359 * where contextPath is the context path of this ServletContext..
360 * <p/>
361 * <p>The real path returned will be in a form
362 * appropriate to the computer and operating system on
363 * which the servlet container is running, including the
364 * proper path separators. This method returns <code>null</code>
365 * if the servlet container cannot translate the virtual path
366 * to a real path for any reason (such as when the content is
367 * being made available from a <code>.war</code> archive).
368 *
369 * @param path a <code>String</code> specifying a virtual path
370 * @return a <code>String</code> specifying the real path,
371 * or null if the translation cannot be performed
372 */
373 String getRealPath(String path);
374
375 /**
376 * Returns the name and version of the servlet container on which
377 * the servlet is running.
378 * <p/>
379 * <p>The form of the returned string is
380 * <i>servername</i>/<i>versionnumber</i>.
381 * For example, the JavaServer Web Development Kit may return the string
382 * <code>JavaServer Web Dev Kit/1.0</code>.
383 * <p/>
384 * <p>The servlet container may return other optional information
385 * after the primary string in parentheses, for example,
386 * <code>JavaServer Web Dev Kit/1.0 (JDK 1.1.6; Windows NT 4.0 x86)</code>.
387 *
388 * @return a <code>String</code> containing at least the
389 * servlet container name and version number
390 */
391 String getServerInfo();
392
393 /**
394 * Returns a <code>String</code> containing the value of the named
395 * context-wide initialization parameter, or <code>null</code> if the
396 * parameter does not exist.
397 * <p/>
398 * <p>This method can make available configuration information useful
399 * to an entire "web application". For example, it can provide a
400 * webmaster's email address or the name of a system that holds
401 * critical data.
402 *
403 * @param name a <code>String</code> containing the name of the
404 * parameter whose value is requested
405 * @return a <code>String</code> containing at least the
406 * servlet container name and version number
407 * @see ServletConfig#getInitParameter
408 */
409 String getInitParameter(String name);
410
411 /**
412 * Returns the names of the context's initialization parameters as an
413 * <code>Enumeration</code> of <code>String</code> objects, or an
414 * empty <code>Enumeration</code> if the context has no initialization
415 * parameters.
416 *
417 * @return an <code>Enumeration</code> of <code>String</code>
418 * objects containing the names of the context's
419 * initialization parameters
420 * @see ServletConfig#getInitParameter
421 */
422 Enumeration<String> getInitParameterNames();
423
424 /**
425 * Set the init parameter if it is not already set.
426 *
427 * @param name of the init parameter to set
428 * @param value new value
429 * @return whether it was set
430 * @since 3.0
431 */
432 boolean setInitParameter(String name, String value);
433
434 /**
435 * Returns the servlet container attribute with the given name,
436 * or <code>null</code> if there is no attribute by that name.
437 * An attribute allows a servlet container to give the
438 * servlet additional information not
439 * already provided by this interface. See your
440 * server documentation for information about its attributes.
441 * A list of supported attributes can be retrieved using
442 * <code>getAttributeNames</code>.
443 * <p/>
444 * <p>The attribute is returned as a <code>java.lang.Object</code>
445 * or some subclass.
446 * Attribute names should follow the same convention as package
447 * names. The Java Servlet API specification reserves names
448 * matching <code>java.*</code>, <code>javax.*</code>,
449 * and <code>sun.*</code>.
450 *
451 * @param name a <code>String</code> specifying the name
452 * of the attribute
453 * @return an <code>Object</code> containing the value
454 * of the attribute, or <code>null</code>
455 * if no attribute exists matching the given
456 * name
457 * @see ServletContext#getAttributeNames
458 */
459 Object getAttribute(String name);
460
461 /**
462 * Returns an <code>Enumeration</code> containing the
463 * attribute names available
464 * within this servlet context. Use the
465 * {@link #getAttribute} method with an attribute name
466 * to get the value of an attribute.
467 *
468 * @return an <code>Enumeration</code> of attribute
469 * names
470 * @see #getAttribute
471 */
472 Enumeration<String> getAttributeNames();
473
474 /**
475 * Binds an object to a given attribute name in this servlet context. If
476 * the name specified is already used for an attribute, this
477 * method will replace the attribute with the new to the new attribute.
478 * <p>If listeners are configured on the <code>ServletContext</code> the
479 * container notifies them accordingly.
480 * <p/>
481 * If a null value is passed, the effect is the same as calling
482 * <code>removeAttribute()</code>.
483 * <p/>
484 * <p>Attribute names should follow the same convention as package
485 * names. The Java Servlet API specification reserves names
486 * matching <code>java.*</code>, <code>javax.*</code>, and
487 * <code>sun.*</code>.
488 *
489 * @param name a <code>String</code> specifying the name
490 * of the attribute
491 * @param object an <code>Object</code> representing the
492 * attribute to be bound
493 */
494 void setAttribute(String name, Object object);
495
496 /**
497 * Removes the attribute with the given name from
498 * the servlet context. After removal, subsequent calls to
499 * {@link #getAttribute} to retrieve the attribute's value
500 * will return <code>null</code>.
501 * <p/>
502 * <p>If listeners are configured on the <code>ServletContext</code> the
503 * container notifies them accordingly.
504 *
505 * @param name a <code>String</code> specifying the name
506 * of the attribute to be removed
507 */
508 void removeAttribute(String name);
509
510 /**
511 * Returns the name of this web application corresponding to this ServletContext as specified in the deployment
512 * descriptor for this web application by the display-name element.
513 *
514 * @return The name of the web application or null if no name has been declared in the deployment descriptor.
515 * @since Servlet 2.3
516 */
517 String getServletContextName();
518
519 /**
520 * Add the specified servlet to the context
521 *
522 * @param servletName servlet's name
523 * @param className class name of servlet
524 * @return ServletRegistration.Dynamic allowing configuration of the servlet
525 * @throws IllegalArgumentException duplicate servletName
526 * @throws IllegalStateException this method called after #initialize
527 * @since 3.0
528 */
529 ServletRegistration.Dynamic addServlet(String servletName, String className) throws IllegalArgumentException, IllegalStateException;
530
531 /**
532 * Add the specified servlet to the context
533 *
534 * @param servletName servlet's name
535 * @param servlet servlet instance, perhaps created with createServlet
536 * @return ServletRegistration.Dynamic allowing configuration of the servlet
537 * @throws IllegalArgumentException duplicate servletName
538 * @throws IllegalStateException this method called after #initialize
539 * @since 3.0
540 */
541 ServletRegistration.Dynamic addServlet(String servletName, Servlet servlet) throws IllegalArgumentException, IllegalStateException;
542
543 /**
544 * Add the specified servlet to the context
545 *
546 * @param servletName servlet's name
547 * @param clazz class of the servlet
548 * @return ServletRegistration.Dynamic allowing configuration of the servlet
549 * @throws IllegalArgumentException duplicate servletName
550 * @throws IllegalStateException this method called after #initialize
551 * @since 3.0
552 */
553 ServletRegistration.Dynamic addServlet(String servletName, Class<? extends Servlet> clazz) throws IllegalArgumentException, IllegalStateException;
554
555 /**
556 * Create a servlet with dependencies injected.
557 *
558 * @param clazz servlet class
559 * @return instantiated and injected servlet
560 * @throws ServletException if something goes wrong
561 * @since Servlet 3.0
562 */
563 <T extends Servlet> T createServlet(Class<T> clazz) throws ServletException;
564
565 /**
566 * Fish out the servlet registration for a named servlet
567 *
568 * @param servletName name of the servlet you want to configure
569 * @return ServletRegistration for servlet you want
570 * @since 3.0
571 */
572 ServletRegistration getServletRegistration(String servletName);
573
574 /**
575 * Fish out the servlet registration for a named servlet
576 *
577 * @return Map of name to ServletRegistration for all registered servlets
578 * @since 3.0
579 */
580 Map<String, ? extends ServletRegistration> getServletRegistrations();
581
582 /**
583 * Add a filter to this context
584 *
585 * @param filterName name of filter
586 * @param className class name of filter
587 * @return FilterRegistration.Dynamic allowing configuration of filter
588 * @throws IllegalArgumentException duplicate filter name
589 * @throws IllegalStateException if called after #initialise
590 * @since 3.0
591 */
592 FilterRegistration.Dynamic addFilter(String filterName, String className) throws IllegalArgumentException, IllegalStateException;
593
594 /**
595 * Add a filter to this context
596 *
597 * @param filterName name of filter
598 * @param filter filter instance perhaps from createFilter method
599 * @return FilterRegistration.Dynamic allowing configuration of filter
600 * @throws IllegalArgumentException duplicate filter name
601 * @throws IllegalStateException if called after #initialise
602 * @since 3.0
603 */
604 FilterRegistration.Dynamic addFilter(String filterName, Filter filter) throws IllegalArgumentException, IllegalStateException;
605
606 /**
607 * Add a filter to this context
608 *
609 * @param filterName name of filter
610 * @param filterClass filter class
611 * @return FilterRegistration.Dynamic allowing configuration of filter
612 * @throws IllegalArgumentException duplicate filter name
613 * @throws IllegalStateException if called after #initialise
614 * @since 3.0
615 */
616 FilterRegistration.Dynamic addFilter(String filterName, Class<? extends Filter> filterClass) throws IllegalArgumentException, IllegalStateException;
617
618 /**
619 * Create a filter with dependencies injected.
620 *
621 * @param clazz filter class
622 * @return instantiated and injected filter
623 * @throws ServletException if something goes wrong
624 * @since Servlet 3.0
625 */
626 <T extends Filter> T createFilter(Class<T> clazz) throws ServletException;
627
628 /**
629 * Return the FilterRegistration corresponding to the named filter
630 * @param filterName Name of filter you want to configure
631 * @return FilterRegistration allowing configuration of filter
632 * @since 3.0
633 */
634 FilterRegistration getFilterRegistration(String filterName);
635
636 /**
637 * Return a possibly empty immutable map of registrations for all filters.
638 * @return FilterRegistration allowing configuration of filter
639 * @since 3.0
640 */
641 Map<String, ? extends FilterRegistration> getFilterRegistrations();
642
643 /**
644 * Add a listener created from the specified class
645 * @param listenerClass class of listener to add
646 * @since Servlet 3.0
647 */
648 void addListener(Class<? extends EventListener> listenerClass);
649
650 /**
651 * Add a listener created from the specified class name
652 * @param className name of class of listener to add
653 * @since Servlet 3.0
654 */
655 void addListener(String className);
656
657 /**
658 * add the listener instance
659 * @param t listener instance
660 * @param <T> type of listener
661 * @since Servlet 3.0
662 */
663 <T extends EventListener> void addListener(T t);
664
665 /**
666 * create a fully initialized listener
667 * @param clazz listener class
668 * @param <T> type of listener class
669 * @return fully initialized listener object
670 * @since Servlet 3.0
671 */
672 <T extends EventListener> T createListener(Class<T> clazz) throws ServletException;
673
674 /**
675 * declare the roles used in the web app as argumnents to isUserInRole
676 * @param roleNames the role names used in the web app
677 * @since Servlet 3.0
678 */
679 void declareRoles(String... roleNames);
680
681 /**
682 * @return configuration of session cookie
683 * @since 3.0
684 */
685 SessionCookieConfig getSessionCookieConfig();
686
687 /**
688 * @param sessionTrackingModes enumset of SessionTrackingModes for this web app
689 * @since 3.0
690 */
691 void setSessionTrackingModes(Set<SessionTrackingMode> sessionTrackingModes);
692
693 /**
694 * @return the default session tracking modes
695 * @since 3.0
696 */
697 Set<SessionTrackingMode> getDefaultSessionTrackingModes();
698
699 /**
700 *
701 * @return the major version of the servlet spec the web app thinks it is using.
702 * @throws UnsupportedOperationException if this ServletContext was constructed in a way where the spec version cannot be determined.
703 * @since 3.0
704 */
705 int getEffectiveMajorVersion() throws UnsupportedOperationException;
706
707 /**
708 *
709 * @return the minor version of the servlet spec the web app thinks it is using.
710 * @throws UnsupportedOperationException if this ServletContext was constructed in a way where the spec version cannot be determined.
711 * @since 3.0
712 */
713 int getEffectiveMinorVersion() throws UnsupportedOperationException;
714
715 /**
716 * @return the actual session tracking modes. These will be the default ones unless they've been explicitly set.
717 * @since 3.0
718 */
719 Set<SessionTrackingMode> getEffectiveSessionTrackingModes();
720
721 /**
722 *
723 * @return the classloader for this web app
724 * @since 3.0
725 */
726 ClassLoader getClassLoader();
727
728 /**
729 *
730 * @return jsp config aggregated from xml bits or null
731 * @since 3.0
732 */
733 JspConfigDescriptor getJspConfigDescriptor ();
734
735 }
736
737