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 /*
  * Copyright (C) 2010 The Guava Authors
  *
  * 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 com.google.common.util.concurrent;
import static java.util.logging.Level.SEVERE;
Factories for java.lang.Thread.UncaughtExceptionHandler instances.

Author(s):
Gregory Kick
Since:
8.0
public final class UncaughtExceptionHandlers {
  private UncaughtExceptionHandlers() {}

  
Returns an exception handler that exits the system. This is particularly useful for the main thread, which may start up other, non-daemon threads, but fail to fully initialize the application successfully.

Example usage:

public static void main(String[] args) {
   Thread.currentThread().setUncaughtExceptionHandler(UncaughtExceptionHandlers.systemExit());
   ...
 

The returned handler logs any exception at severity SEVERE and then shuts down the process with an exit status of 1, indicating abnormal termination.

  public static UncaughtExceptionHandler systemExit() {
    return new Exiter(Runtime.getRuntime());
  }
  @VisibleForTesting static final class Exiter implements UncaughtExceptionHandler {
    private static final Logger logger = Logger.getLogger(Exiter.class.getName());
    private final Runtime runtime;
    Exiter(Runtime runtime) {
      this. = runtime;
    }
    @Override public void uncaughtException(Thread tThrowable e) {
      // cannot use FormattingLogger due to a dependency loop
      .log(, String.format("Caught an exception in %s.  Shutting down."t), e);
      .exit(1);
    }
  }
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