1 package org.codehaus.plexus.util.cli; 2 3 /* 4 * Copyright The Codehaus Foundation. 5 * 6 * Licensed under the Apache License, Version 2.0 (the "License"); 7 * you may not use this file except in compliance with the License. 8 * You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 import java.security.AccessControlException; 20 21 /** 22 * A shutdown hook that does not throw any exceptions upon container startup/shutdown or security manager restrictions. 23 * Incorrect usage of the hook itself may still throw an exception. 24 * 25 * @author Kristian Rosenvold 26 */ 27 class ShutdownHookUtils { 28 29 public static void addShutDownHook(Thread hook) { 30 try { 31 Runtime.getRuntime().addShutdownHook(hook); 32 } catch (IllegalStateException ignore) { 33 } catch (AccessControlException ignore) { 34 } 35 } 36 37 public static void removeShutdownHook(Thread hook) { 38 try { 39 Runtime.getRuntime().removeShutdownHook(hook); 40 } catch (IllegalStateException ignore) { 41 } catch (AccessControlException ignore) { 42 } 43 } 44 }