| /* |
| * 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(); |
| } |
| } |
| } |