1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 package org.apache.commons.launcher;
19
20 /**
21 * A class that subclasses the {@link ThreadGroup} class. This class is used
22 * by {@link ChildMain#main(String[])} to run the target application. By using
23 * this class, any {@link Error} other than {@link ThreadDeath} thrown by
24 * threads created by the target application will be caught the process
25 * terminated. By default, the JVM will only print a stack trace of the
26 * {@link Error} and destroy the thread. However, when an uncaught
27 * {@link Error} occurs, it normally means that the JVM has encountered a
28 * severe problem. Hence, an orderly shutdown is a reasonable approach.
29 * <p>
30 * Note: not all threads created by the target application are guaranteed to
31 * use this class. Target application's may bypass this class by creating a
32 * thread using the {@link Thread#Thread(ThreadGroup, String)} or other similar
33 * constructors.
34 *
35 * @author Patrick Luby
36 */
37 public class ExitOnErrorThreadGroup extends ThreadGroup {
38
39 //------------------------------------------------------------ Constructors
40
41 /**
42 * Constructs a new thread group. The parent of this new group is the
43 * thread group of the currently running thread.
44 *
45 * @param name the name of the new thread group
46 */
47 public ExitOnErrorThreadGroup(String name) {
48
49 super(name);
50
51 }
52
53 //----------------------------------------------------------------- Methods
54
55 /**
56 * Trap any uncaught {@link Error} other than {@link ThreadDeath} and exit.
57 *
58 * @param t the thread that is about to exit
59 * @param e the uncaught exception
60 */
61 public void uncaughtException(Thread t, Throwable e) {
62
63 if (e instanceof ThreadDeath)
64 return;
65
66 Launcher.error(e);
67 System.exit(1);
68
69 }
70
71 }