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Note that all operations that are part of the Object MBean interface are not exposed directly. According to JMX API specs, the invocation of those operations needs to be done using the MBeanServer Agent.

public class Example
{
	public static void main(String[] args) throws Exception
	{
		MBeanServer server = ManagementFactory.getPlatformMBeanServer();

		// Suppose that this is an object name corresponding to a valid managed domain instance.
		ObjectName objectName = ...;

		// Suppose the mbean has an attribute (a statistic in this case) PendingMessagesCount
		Long attributeValue = (Long) server.getAttribute(objectName, "PendingMessagesCount");

		System.out.println("Attribute Value : "+attributeValue);
	}
}

public class Example
{
	public static void main(String[] args) throws Exception
	{
		MBeanServer server = ManagementFactory.getPlatformMBeanServer();

		// Suppose that this is an object name corresponding to a valid managed domain instance.
		ObjectName objectName = ...;

		// Suppose we want to set a value of 30000 for "MgmtPubInterval" attribute.
                Attribute attribute = new Attribute("MgmtPubInterval",new Long(3000));
		server.setAttribute(objectName, attribute);
	}
}

public class Example
{
	public static void main(String[] args) throws Exception
	{
		MBeanServer server = ManagementFactory.getPlatformMBeanServer();

		// Suppose that this is an object name corresponding to a valid managed domain instance.
		ObjectName objectName = new ObjectName("A:N=1");

		// Suppose the mbean has an operation
		// public int purge(int request)
		try
		{
			String outputParameterName = "result";

			String operationName = "purge";
			Object [] parameters = new Object[]{1235};
			String [] signature = new String[]{int.class.getName()};

			InvocationResult result = (InvocationResult) server.invoke(objectName, operationName,parameters,signature);

			// Output parameters map
			Map<String,Object> outputSection = result.getOutputSection();

			// Output parameter
			Integer outputParameter = (Integer) outputSection.get(outputParameterName);

			System.out.println("Output parameter : "+outputParameter);

		} catch (MBeanException exception)
		{
			if (exception.getTargetException() instanceof MethodInvocationException)
			{
				MethodInvocationException invocationException = (MethodInvocationException) exception.getTargetException();
				System.out.println("Status Code : "+invocationException.getReturnCode());
				System.out.println("Status Text : "+invocationException.getStatusText());
			}
		}
	}
}