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CREATE TABLE BOOK_STOCK ( ISBN VARCHAR(50) STOCK INT PRIMARY KEY (ISBN), CHECK (STOCK >= 0) ); CREATE TABLE ACCOUNT ( USERNAME VARCHAR(50) BALANCE INT PRIMARY KEY (USERNAME), CHECK (BALANCE >= 0) );

Registering MBeans Without Spring s Support First, let s see how to register a model MBean using the JMX API directly. In the following Main class, you get the documentReplicator bean from the IoC container and register it as an MBean for management and monitoring. All properties and methods are included in the MBean s management interface. package com.apress.springrecipes.replicator; ... import java.lang.management.ManagementFactory; import import import import import import import import import import import javax.management.Descriptor; javax.management.JMException; javax.management.MBeanServer; javax.management.ObjectName; javax.management.modelmbean.DescriptorSupport; javax.management.modelmbean.InvalidTargetObjectTypeException; javax.management.modelmbean.ModelMBeanAttributeInfo; javax.management.modelmbean.ModelMBeanInfo; javax.management.modelmbean.ModelMBeanInfoSupport; javax.management.modelmbean.ModelMBeanOperationInfo; javax.management.modelmbean.RequiredModelMBean;

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Each of these methods has its own characteristics and limitations [Cockburn 2002] By choosing to videoconference rather than speaking face to face, we remove physical proximity from the communication medium Detail is obscured, and we lose many of the subliminal cues that we use to build rapport Negotiation, problem solving, and brainstorming all become more difficult Moving from videoconferencing to phone, we lose visual gestures, expressions, and pointing It s hard to keep track of exactly what the speaker is referring to When we draw on a whiteboard, the actions of drawing and speaking serve to anchor and expand on each other This is lost in a phone conversation In email there s no vocal inflection or timing It s hard to get a sense of which ideas are more important, in what way they re being put forward, and.

import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class Main {

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public static void main(String[] args) throws IOException { ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml"); FileReplicator documentReplicator = (FileReplicator) context.getBean("documentReplicator"); try { MBeanServer mbeanServer = ManagementFactory.getPlatformMBeanServer(); ObjectName objectName = new ObjectName("bean:name=documentReplicator"); RequiredModelMBean mbean = new RequiredModelMBean(); mbean.setManagedResource(documentReplicator, "objectReference"); Descriptor srcDirDescriptor = new DescriptorSupport(new String[] { "name=SrcDir", "descriptorType=attribute", "getMethod=getSrcDir", "setMethod=setSrcDir" }); ModelMBeanAttributeInfo srcDirInfo = new ModelMBeanAttributeInfo( "SrcDir", "java.lang.String", "Source directory", true, true, false, srcDirDescriptor); Descriptor destDirDescriptor = new DescriptorSupport(new String[] { "name=DestDir", "descriptorType=attribute", "getMethod=getDestDir", "setMethod=setDestDir" }); ModelMBeanAttributeInfo destDirInfo = new ModelMBeanAttributeInfo( "DestDir", "java.lang.String", "Destination directory", true, true, false, destDirDescriptor); ModelMBeanOperationInfo getSrcDirInfo = new ModelMBeanOperationInfo( "Get source directory", FileReplicator.class.getMethod("getSrcDir")); ModelMBeanOperationInfo setSrcDirInfo = new ModelMBeanOperationInfo( "Set source directory", FileReplicator.class.getMethod("setSrcDir", String.class)); ModelMBeanOperationInfo getDestDirInfo = new ModelMBeanOperationInfo( "Get destination directory", FileReplicator.class.getMethod("getDestDir")); ModelMBeanOperationInfo setDestDirInfo = new ModelMBeanOperationInfo( "Set destination directory", FileReplicator.class.getMethod("setDestDir", String.class)); ModelMBeanOperationInfo replicateInfo = new ModelMBeanOperationInfo( "Replicate files", FileReplicator.class.getMethod("replicate")); ModelMBeanInfo mbeanInfo = new ModelMBeanInfoSupport( "FileReplicator", "File replicator", new ModelMBeanAttributeInfo[] { srcDirInfo, destDirInfo },

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null, new ModelMBeanOperationInfo[] { getSrcDirInfo, setSrcDirInfo, getDestDirInfo, setDestDirInfo, replicateInfo }, null); mbean.setModelMBeanInfo(mbeanInfo); mbeanServer.registerMBean(mbean, objectName); } catch (JMException e) { ... } catch (InvalidTargetObjectTypeException e) { ... } catch (NoSuchMethodException e) { ... } System.in.read(); } } To register an MBean, you need an MBeanServer instance. In JDK 1.5, you can call the static method ManagementFactory.getPlatformMBeanServer() to locate a platform MBean server. It will create an MBean server if none exists, and then register this server instance for future use. Each MBean requires an MBean object name that includes a domain. The preceding MBean is registered under the domain bean with the name documentReplicator. From the preceding code, you can see that for each MBean attribute and MBean operation, you need to create a ModelMBeanAttributeInfo object and a ModelMBeanOperationInfo object for describing it. After those, you have to create a ModelMBeanInfo object for describing the MBean s management interface by assembling the preceding information. For details about using these classes, you can consult their javadocs. Moreover, you have to handle the JMX-specific exceptions when calling the JMX API. These exceptions are checked exceptions that you must handle. Note that you must prevent your application from terminating before you look inside it with a JMX client tool. Requesting a key from the console using System.in.read() would be a good choice. Finally, you have to add the VM argument -Dcom.sun.management.jmxremote to enable local monitoring of this application. java -Dcom.sun.management.jmxremote com.apress.springrecipes.replicator.Main Now you can use any JMX client tools to monitor your MBeans locally. The simplest one may be JConsole, which comes with JDK 1.5.

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