For use in your apps, the correct way is to get a reference to the MBeanServer and invoke methods on the MBean by passing object name, method name, method signature stuff to MBeanServer ref.
#1 for use when the calling code is running in same JVM as MBeanServer: This is some simple code I wrote to access one of my own MBean from a servlet:
public class FileSystem {
public static void deleteFilesFromDirectory (String path, String[] excludedExtentions) {
try {
Object[] args = new Object[2];
args[0] = path;
args[1] = excludedExtentions;
String[] argClasses = new String[2];
argClasses[0] = "java.lang.String";
argClasses[1] = "java.lang.String[]";
getServer().invoke (getObjectName(), "deleteFilesFromDirectory", args, argClasses);
}
catch (Exception ex) {
}
}
private static ObjectName getObjectName () throws Exception {
return new ObjectName ("Tes:service=FileSystemService");
}
private static MBeanServer getServer () throws Exception {
return (MBeanServer)MBeanServerFactory.findMBeanServer(null).iterator().next();
}
}
#2 for use when the calling code is running in a different JVM from the MBeanServer This is an example I wrote to access MBean from main.
public class Client {
public static void main (String[] args) throws Exception {
try {
// Set up jndi properties
Properties props = new Properties();
props.put(Context.INITIAL_CONTEXT_FACTORY, "org.jnp.interfaces.NamingContextFactory");
props.put(Context.URL_PKG_PREFIXES, "org.jboss.naming:org.jnp.interfaces");
props.put(Context.PROVIDER_URL, "jnp://localhost:1099");
InitialContext ctx = new InitialContext(props);
System.out.println ("Got context");
// Retrieve the RMI adaptor, can see this in jmx console
Object obj = ctx.lookup("jmx:<machine name>:rmi");
System.out.println ("Got RMI Adapter");
ctx.close();
// Wrap it in a connector
RemoteMBeanServer server = new RMIConnectorImpl((RMIAdaptor)obj);
// add your code here to call invoke method on server just like above.
}
catch (Exception ex) {
ex.printStackTrace();
}
}
}
#3 for calling simple methods on MBeanServer from html. See implementation of jmx-console.
Hope this helps.
Greg
Luttrell, Peter wrote:
I have a custom JMX MBean.What is the 'correct' way to look it up for use in my apps (webapps if it matters)?I know i could manually bind it the jndi tree, or create a singleton like accessor method, but what is considered the 'correct' way to access the bean?thanks..peter
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