1 /**
2 * Copyright 2003-2007 Greg Luck
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 package net.sf.ehcache.constructs.web.filter;
18
19 import net.sf.ehcache.CacheException;
20
21 /**
22 * Thrown when it is detected that a caching filter's {@link CachingFilter#doFilter(javax.servlet.ServletRequest, javax.servlet.ServletResponse, javax.servlet.FilterChain)}
23 * method is reentered by the same thread.
24 * <p/>
25 * Reentrant calls will block indefinitely because the first request has not yet
26 * unblocked the cache.
27 * <p/>
28 * This condition usually happens declaratively when the same filter is specified twice in a filter chain
29 * or programmatically when a {@link javax.servlet.RequestDispatcher} includes or forwards back to the same URL,
30 * either directly or indirectly.
31 * @author Greg Luck
32 * @version $Id: FilterNonReentrantException.java 512 2007-07-10 09:18:45Z gregluck $
33 */
34 public class FilterNonReentrantException extends CacheException {
35
36 /**
37 * Constructor for the exception
38 */
39 public FilterNonReentrantException() {
40 super();
41 }
42
43 /**
44 * Constructs an exception with the message given
45 *
46 * @param message the message
47 */
48 public FilterNonReentrantException(String message) {
49 super(message);
50 }
51 }