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Diffstat (limited to 'qpid/java/common/src/main/java/org/apache/qpid/thread/LoggingUncaughtExceptionHandler.java')
-rw-r--r-- | qpid/java/common/src/main/java/org/apache/qpid/thread/LoggingUncaughtExceptionHandler.java | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/qpid/java/common/src/main/java/org/apache/qpid/thread/LoggingUncaughtExceptionHandler.java b/qpid/java/common/src/main/java/org/apache/qpid/thread/LoggingUncaughtExceptionHandler.java new file mode 100644 index 0000000000..192675edcd --- /dev/null +++ b/qpid/java/common/src/main/java/org/apache/qpid/thread/LoggingUncaughtExceptionHandler.java @@ -0,0 +1,60 @@ +/* + * + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you 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 org.apache.qpid.thread; + +import java.lang.Thread.UncaughtExceptionHandler; + +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +/** + * + * An {@link UncaughtExceptionHandler} that writes the exception to the application log via + * the SLF4J framework. Once registered with {@link Thread#setUncaughtExceptionHandler(UncaughtExceptionHandler)} + * it will be invoked by the JVM when a thread has been <i>abruptly</i> terminated due to an uncaught exception. + * Owing to the contract of {@link Runnable#run()}, the only possible exception types which can cause such a termination + * are instances of {@link RuntimeException} and {@link Error}. These exceptions are catastrophic and the client must + * restart the JVM. + * <p> + * The implementation also invokes {@link ThreadGroup#uncaughtException(Thread, Throwable)}. This + * is done to retain compatibility with any monitoring solutions (for example, log scraping of + * standard error) that existing users of older Qpid client libraries may have in place. + * + */ +public class LoggingUncaughtExceptionHandler implements UncaughtExceptionHandler +{ + private static final Logger _logger = LoggerFactory.getLogger(LoggingUncaughtExceptionHandler.class); + + @Override + public void uncaughtException(Thread t, Throwable e) + { + try + { + _logger.error("Uncaught exception in thread \"{}\"", t.getName(), e); + } + finally + { + // Invoke the thread group's handler too for compatibility with any + // existing clients who are already scraping stderr for such conditions. + t.getThreadGroup().uncaughtException(t, e); + } + } +}
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