UncaughtExceptionHandlerInitializer.java

/**
 * Copyright (c) 2015-2016 Peti Koch
 *
 * 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 ch.petikoch.examples.mvvm_rxjava.utils;

import com.google.common.base.Throwables;

import java.lang.Thread.UncaughtExceptionHandler;

public class UncaughtExceptionHandlerInitializer {

    public static void initUncaughtExceptionHandler() {
        if (Thread.getDefaultUncaughtExceptionHandler() != null) {
            throw new IllegalStateException("Default DefaultUncaughtExceptionHandler is already set: "
                    + Thread.getDefaultUncaughtExceptionHandler());
        }
        Thread.setDefaultUncaughtExceptionHandler(new LoggingExceptionHandler());
        System.setProperty("sun.awt.exception.handler", LoggingExceptionHandler.class.getName());
    }

    public static class LoggingExceptionHandler implements UncaughtExceptionHandler {

        @Override
        public void uncaughtException(Thread thread, Throwable e) {
            SysOutUtils.syserr("Uncaught exception in " + thread + ": " + e.getMessage(), e);
        }

        // See Javadoc in EventDispatchThread#handleException
        public void handle(final Throwable thrown) {
            SysOutUtils.syserr("Unhandled exception in AWT Thread. Will log and rethrow: " + thrown.getMessage(), thrown);
            Throwables.propagate(thrown);
        }

    }
}