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There is a newer version: 8.16.0
/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the Elastic License
 * 2.0 and the Server Side Public License, v 1; you may not use this file except
 * in compliance with, at your election, the Elastic License 2.0 or the Server
 * Side Public License, v 1.
 */

package org.elasticsearch.bootstrap;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.elasticsearch.core.SuppressForbidden;

import java.io.IOError;
import java.security.AccessController;
import java.security.PrivilegedAction;

class ElasticsearchUncaughtExceptionHandler implements Thread.UncaughtExceptionHandler {
    private static final Logger logger = LogManager.getLogger(ElasticsearchUncaughtExceptionHandler.class);

    @Override
    public void uncaughtException(Thread thread, Throwable t) {
        if (isFatalUncaught(t)) {
            try {
                onFatalUncaught(thread.getName(), t);
            } finally {
                // we use specific error codes in case the above notification failed, at least we
                // will have some indication of the error bringing us down
                if (t instanceof InternalError) {
                    halt(128);
                } else if (t instanceof OutOfMemoryError) {
                    halt(127);
                } else if (t instanceof StackOverflowError) {
                    halt(126);
                } else if (t instanceof UnknownError) {
                    halt(125);
                } else if (t instanceof IOError) {
                    halt(124);
                } else {
                    halt(1);
                }
            }
        } else {
            onNonFatalUncaught(thread.getName(), t);
        }
    }

    static boolean isFatalUncaught(Throwable e) {
        return e instanceof Error;
    }

    void onFatalUncaught(final String threadName, final Throwable t) {
        final String message = "fatal error in thread [" + threadName + "], exiting";
        logErrorMessage(t, message);
    }

    void onNonFatalUncaught(final String threadName, final Throwable t) {
        final String message = "uncaught exception in thread [" + threadName + "]";
        logErrorMessage(t, message);
    }

    private static void logErrorMessage(Throwable t, String message) {
        AccessController.doPrivileged((PrivilegedAction) () -> {
            logger.error(message, t);
            return null;
        });
    }

    void halt(int status) {
        AccessController.doPrivileged(new PrivilegedHaltAction(status));
    }

    static class PrivilegedHaltAction implements PrivilegedAction {

        private final int status;

        private PrivilegedHaltAction(final int status) {
            this.status = status;
        }

        @SuppressForbidden(reason = "halt")
        @Override
        public Void run() {
            // we halt to prevent shutdown hooks from running
            Runtime.getRuntime().halt(status);
            return null;
        }

    }

}