[java] Calling JMX MBean method from a shell script

@Dougnukem answer helped me a lot. I have taken the Groovy approach (using groovy 2.3.3).

I did some changes on Dougnukem code. This will work with Java 7 and will print two attributes to stdout every 10 sec.

        package com.my.company.jmx
        import groovy.util.GroovyMBean;
        import javax.management.remote.JMXServiceURL
        import javax.management.remote.JMXConnectorFactory
        import java.lang.management.*

            class Monitor {
                static main(args) {
                    def serverUrl = 'service:jmx:rmi:///jndi/rmi://localhost:5019/jmxrmi'
                    String beanName = "Catalina:type=DataSource,class=javax.sql.DataSource,name=\"jdbc/CommonDB\""
                    println  "numIdle,numActive"

                    while(1){
                        def server = JMXConnectorFactory.connect(new JMXServiceURL(serverUrl))
                       //make sure to reconnect in case the jvm was restrated 
                        server.connect()
                        GroovyMBean mbean = new GroovyMBean(server.MBeanServerConnection, beanName)
                        println  "${mbean.numIdle},${mbean.numActive}"
                        server.close()
                        sleep(10000)
                    }

                }
            }

Compile this code into a jar using maven-compiler-plugin so you will not require groovy installation only the groovy-all.jar . Below is the relevant plugin definition and dependency.

   <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <compilerId>groovy-eclipse-compiler</compilerId>
                    <source>1.7</source>
                    <target>1.7</target>
                </configuration>
                <dependencies>
                    <dependency>
                        <groupId>org.codehaus.groovy</groupId>
                        <artifactId>groovy-eclipse-compiler</artifactId>
                        <version>2.8.0-01</version>
                    </dependency>
                    <dependency>
                        <groupId>org.codehaus.groovy</groupId>
                        <artifactId>groovy-eclipse-batch</artifactId>
                        <version>2.3.4-01</version>
                    </dependency>
                </dependencies>
            </plugin>
        </plugins>
    </build>
    <dependencies>
        <dependency>
            <groupId>org.codehaus.groovy</groupId>
            <artifactId>groovy-all</artifactId>
            <version>2.4.3</version>
        </dependency>
    </dependencies>

Wrap it with a bat or a shell and it will print the data to stdout.