org.apache.openejb.util.HeapDump Maven / Gradle / Ivy
/*
* 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.openejb.util;
import org.apache.openejb.monitoring.LocalMBeanServer;
import javax.management.MBeanServer;
import java.lang.management.ManagementFactory;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
/**
* @version $Rev$ $Date$
*/
public class HeapDump {
public static String to(String fileName) {
dumpHeap(fileName);
return fileName;
}
/**
* Dumps the java heap to the specified file in hprof format.
* This method will not overwrite the dump file, so make sure it doesn't already exist.
*
* @param fileName the dump file name which must not already exist.
*/
public static void dumpHeap(String fileName) {
Class clazz;
try {
clazz = Class.forName("com.sun.management.HotSpotDiagnosticMXBean");
} catch (ClassNotFoundException e) {
System.out.println("ERROR: dumpHeap only works on a Sun Java 1.6+ VM containing " +
"the class com.sun.management.HotSpotDiagnosticMXBean");
return;
}
// use JMX to find hot spot mbean
Object hotspotMBean = null;
try {
MBeanServer server = LocalMBeanServer.get();
hotspotMBean = ManagementFactory.newPlatformMXBeanProxy(server,
"com.sun.management:type=HotSpotDiagnostic",
clazz);
} catch (Throwable e) {
System.out.print("ERROR: dumpHeap was unable to obtain the HotSpotDiagnosticMXBean: ");
e.printStackTrace();
}
// invoke the dumpHeap method
try {
Method method = hotspotMBean.getClass().getMethod("dumpHeap", String.class);
method.invoke(hotspotMBean, fileName);
} catch (InvocationTargetException e) {
Throwable t = e.getCause() != null ? e.getCause() : e;
System.out.print("ERROR: dumpHeap threw an exception: ");
t.printStackTrace();
} catch (Throwable e) {
System.out.print("ERROR: dumpHeap threw an exception: ");
e.printStackTrace();
}
}
}