I'm member of 'Enhydra Development Team' and we are currently developing Application Server (Enhydra-Lite) based on Tomcat5.0.
I'm developing a side tool (EnTray - system tray administration tool (used for starting/stopping server actions, accessing deployed applications, etc)) that communicates with Tomcat (its MBeanServer) using JMX and gathers information from/about registered MBeans. As I understood Tomcat 5.0.x offers possibility of "Complete server monitoring using JMX and the manager web application" which is OK (I downloaded "jmx.browser-1.2.0" application from Source Forge which enabled me to se all registered MBeans). But, I need to establish communication with Tomcat thru rmi/jrmp protocol (from diferent virtual mashine). I stumbled upon some configuration parameters on JK2 Home Page ( http://jakarta.apache.org/tomcat/tomcat-4.1-doc/jk2/jk2/configweb.html). Parameters are: mx.enable, mx.httpPort, mx.httpHost, mxjrmpPort (probably typing error, I assume mx.jrmpHost is meant to be here) and mx.jrmpPort. After integration of "mx4j" (2.0.1 release) into Tomcat I had no problems with communication thro HTTP, but JRMP could not be initialized because class "mx4j.adaptor.rmi.jrmp.JRMPAdaptor" was not found (probably some older mx4j implementation - in new versions this class is placed in "mx4j.tools.adaptor.rmi.jrmp" package). I even stumbled, on tomcat users mailing list, on some additional configuration parameters (!!???) that enable configuration of Adapter classes that are going to be initialized (mx.mx4jHttpAdaptorClassName and mx.mx4jJRMPAdaptorClassName), but that didn't work eider. After, repackaging of "JRMPAdaptor" (from "mx4j.adaptor.rmi.jrmp" to "mx4j.tools.adaptor.rmi.jrmp") I've succeeded to establish communication between "EnTray" and Tomcat, and everything looked just fine - until I tried to shutdown the server. I've got "Stoping JMX" log on console and server could not finish shutdown process. To resolve this problem I had to take a look at Tomcats source code (downloaded actual release 5.0.27) and found class of my interest ("org.apache.jk.common.JkMX" - placed in 'jakarta-tomcat-connectors' module). Problem was in "destroy()" method where You are trying to stop "jrmpServerName" ("mx4j.tools.naming.NamingService") and not actually initialized "adaptor" ("mx4j.adaptor.rmi.jrmp.JRMPAdaptor"). Fatherly, I' ve changed JRMAdaptor initialization (in the same class) by adding "mx4j.tools.adaptor.rmi.jrmp.JRMPAdaptor" (latest implementation of mx4j) implementation option ("mx4j.tools.adaptor.http.HttpAdaptor" and "mx4j.adaptor.http.HttpAdaptor" options already existed there). I'm sending adapted JkMX.java file ("org.apache.jk.common.JkMX" implementation) and I hope that You will be so kind to consider those changes and to include them in next Tomcat release (I understand that "This is very experimental" - but is the matter of great importance to me). Regards, Slobodan Vujasinovic Enhydra Development Team
/* * Copyright 1999-2004 The Apache Software Foundation * * 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 org.apache.jk.common; import org.apache.jk.core.JkHandler; import javax.management.MBeanServer; import javax.management.ObjectName; import javax.management.Attribute; import javax.management.MBeanServerFactory; import java.io.IOException; /** * Load the HTTP or RMI adapters for MX4J and JMXRI. * * Add "mx.enabled=true" in jk2.properties to enable it. * You could also select http and/or jrmp protocol, * with mx.httpPort, mx.httpHost, mxjrmpPort and mx.jrmpPort * */ public class JkMX extends JkHandler { MBeanServer mserver; private boolean enabled=false; private int httpport=-1; private String httphost="localhost"; private int jrmpport=-1; private String jrmphost="localhost"; private boolean useXSLTProcessor = true; public JkMX() { } /* -------------------- Public methods -------------------- */ /** Enable the MX4J adapters (new way) */ public void setEnabled(boolean b) { enabled=b; } public boolean getEnabled() { return enabled; } /** Enable the MX4J adapters (old way, compatible) */ public void setPort(int i) { enabled=(i != -1); } public int getPort() { return ((httpport != -1) ? httpport : jrmpport); } /** Enable the MX4J HTTP internal adapter */ public void setHttpPort( int i ) { httpport=i; } public int getHttpPort() { return httpport; } public void setHttpHost(String host ) { this.httphost=host; } public String getHttpHost() { return httphost; } /** Enable the MX4J JRMP internal adapter */ public void setJrmpPort( int i ) { jrmpport=i; } public int getJrmpPort() { return jrmpport; } public void setJrmpHost(String host ) { this.jrmphost=host; } public String getJrmpHost() { return jrmphost; } public boolean getUseXSLTProcessor() { return useXSLTProcessor; } public void setUseXSLTProcessor(boolean uxsltp) { useXSLTProcessor = uxsltp; } /* ==================== Start/stop ==================== */ ObjectName httpServerName=null; ObjectName jrmpServerName=null; ObjectName jrmAdaptor = null; /** Initialize the worker. After this call the worker will be * ready to accept new requests. */ public void loadAdapter() throws IOException { boolean httpAdapterLoaded = false; boolean jrmpAdapterLoaded = false; if ((httpport != -1) && classExists("mx4j.adaptor.http.HttpAdaptor")) { try { httpServerName = registerObject("mx4j.adaptor.http.HttpAdaptor", "Http:name=HttpAdaptor"); if( httphost!=null ) mserver.setAttribute(httpServerName, new Attribute("Host", httphost)); mserver.setAttribute(httpServerName, new Attribute("Port", new Integer(httpport))); if(useXSLTProcessor) { ObjectName processorName = registerObject("mx4j.adaptor.http.XSLTProcessor", "Http:name=XSLTProcessor"); mserver.setAttribute(httpServerName, new Attribute("ProcessorName", processorName)); } // starts the server mserver.invoke(httpServerName, "start", null, null); log.info( "Started MX4J console on host " + httphost + " at port " + httpport); httpAdapterLoaded = true; } catch( Throwable t ) { httpServerName=null; log.error( "Can't load the MX4J http adapter ", t ); } } if ((httpport != -1) && (!httpAdapterLoaded) && classExists("mx4j.tools.adaptor.http.HttpAdaptor")) { try { httpServerName = registerObject("mx4j.tools.adaptor.http.HttpAdaptor", "Http:name=HttpAdaptor"); if( httphost!=null ) mserver.setAttribute(httpServerName, new Attribute("Host", httphost)); mserver.setAttribute(httpServerName, new Attribute("Port", new Integer(httpport))); if(useXSLTProcessor) { ObjectName processorName = registerObject("mx4j.tools.adaptor.http.XSLTProcessor", "Http:name=XSLTProcessor"); mserver.setAttribute(httpServerName, new Attribute("ProcessorName", processorName)); } // starts the server mserver.invoke(httpServerName, "start", null, null); log.info( "Started MX4J console on host " + httphost + " at port " + httpport); httpAdapterLoaded = true; } catch( Throwable t ) { httpServerName=null; log.error( "Can't load the MX4J http adapter ", t ); } } if ((jrmpport != -1) && classExists("mx4j.tools.naming.NamingService") && ( classExists("mx4j.tools.adaptor.rmi.jrmp.JRMPAdaptor") || classExists("mx4j.adaptor.rmi.jrmp.JRMPAdaptor"))) { try { jrmpServerName = registerObject("mx4j.tools.naming.NamingService", "Naming:name=rmiregistry"); mserver.setAttribute(jrmpServerName, new Attribute("Port", new Integer(jrmpport))); mserver.invoke(jrmpServerName, "start", null, null); log.info( "Creating " + jrmpServerName ); // Create the JRMP adaptor if (classExists("mx4j.tools.adaptor.rmi.jrmp.JRMPAdaptor")) { jrmAdaptor = registerObject("mx4j.tools.adaptor.rmi.jrmp.JRMPAdaptor", "Adaptor:protocol=jrmp"); } else { jrmAdaptor = registerObject("mx4j.adaptor.rmi.jrmp.JRMPAdaptor", "Adaptor:protocol=jrmp"); } mserver.setAttribute(jrmAdaptor, new Attribute("JNDIName", "jrmp")); mserver.invoke( jrmAdaptor, "putNamingProperty", new Object[] { javax.naming.Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.rmi.registry.RegistryContextFactory"}, new String[] { "java.lang.Object", "java.lang.Object" }); String jrpmurl = "rmi://" + jrmphost + ":" + Integer.toString(jrmpport) ; mserver.invoke( jrmAdaptor, "putNamingProperty", new Object[] { javax.naming.Context.PROVIDER_URL, jrpmurl}, new String[] { "java.lang.Object", "java.lang.Object" }); // Registers the JRMP adaptor in JNDI and starts it mserver.invoke(jrmAdaptor, "start", null, null); log.info( "Creating " + jrmAdaptor + " on host " + jrmphost + " at port " + jrmpport); jrmpAdapterLoaded = true; } catch( Exception ex ) { jrmpServerName = null; log.error( "MX4j RMI adapter not loaded: " + ex.toString()); } } if ((httpport != -1) && (! httpAdapterLoaded) && classExists("com.sun.jdmk.comm.HtmlAdaptorServer")) { try { httpServerName=registerObject("com.sun.jdmk.comm.HtmlAdaptorServer", "Adaptor:name=html,port=" + httpport); log.info("Registering the JMX_RI html adapter " + httpServerName + " at port " + httpport); mserver.setAttribute(httpServerName, new Attribute("Port", new Integer(httpport))); mserver.invoke(httpServerName, "start", null, null); httpAdapterLoaded = true; } catch( Throwable t ) { httpServerName = null; log.error( "Can't load the JMX_RI http adapter " + t.toString() ); } } if ((!httpAdapterLoaded) && (!jrmpAdapterLoaded)) log.warn( "No adaptors were loaded but mx.enabled was defined."); } public void destroy() { try { log.info("Stoping JMX "); if( httpServerName!=null ) { mserver.invoke(httpServerName, "stop", null, null); } if( (jrmpServerName!=null) && (jrmAdaptor!=null) ) { mserver.invoke(jrmAdaptor, "stop", null, null); //mserver.invoke(jrmpServerName, "stop", null, null); } } catch( Throwable t ) { log.error( "Destroy error" + t ); } } public void init() throws IOException { try { mserver = getMBeanServer(); if( enabled ) { loadAdapter(); } try { registerObject("org.apache.log4j.jmx.HierarchyDynamicMBean" , "log4j:hierarchy=default"); log.info("Registering the JMX hierarchy for Log4J "); } catch( Throwable t ) { log.info("Can't enable log4j mx: " + t.toString()); } } catch( Throwable t ) { log.error( "Init error", t ); } } public void addHandlerCallback( JkHandler w ) { } MBeanServer getMBeanServer() { MBeanServer server; if( MBeanServerFactory.findMBeanServer(null).size() > 0 ) { server=(MBeanServer)MBeanServerFactory.findMBeanServer(null).get(0); } else { server=MBeanServerFactory.createMBeanServer(); } return (server); } private static boolean classExists(String className) { try { Thread.currentThread().getContextClassLoader().loadClass(className); return true; } catch(Throwable e) { if (log.isInfoEnabled()) log.info( "className [" + className + "] does not exist"); return false; } } private ObjectName registerObject(String className, String oName) throws Exception { Class c = Class.forName(className); Object o = c.newInstance(); ObjectName objN = new ObjectName(oName); mserver.registerMBean(o, objN); return objN; } private static org.apache.commons.logging.Log log= org.apache.commons.logging.LogFactory.getLog( JkMX.class ); }
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