JMXBeanWrapper can not access a member of class "JMX" with modifiers "public"

I am trying to use the JMXWrapper class/project

For a current project for a set of JMX classes all of them work in peace on either JConsole or VisualVM

For one of them I tried to adapt or work with JMXWrapper:

public interface MainJmxMBean {

	boolean showIfMainIsRunning();

	void stopMain();

}

and

@JMXBean(description="Administrates the Main app", sorted=true)
class MainJmx implements MainJmxMBean {

	private boolean isMainRunning;

	MainJmx() {
		isMainRunning =true;
	}


	@Override
	@JMXBeanOperation(name="Show If Main Is Running",
	                  description="Shows if the Main app is running or not",
	                  sortValue="1")
	public boolean showIfMainIsRunning() {
		return isMainRunning;
	}


	@Override
	@JMXBeanOperation(description="Stops the Main app", sortValue="2")
	public void stopMain() {
		isMainRunning = false;
	}

}

Note: The class shown above works fine without the annotations. Now was annotated to improve the information and its use in JConsole/VisualVM

And finally

private void registerMBeanWithJMXBeanWrapper(ObjectJmxMBean objectJmxMBean) {

	try {
		//System.out.printf("%s %n", objectJmxMBean.toString());
		ObjectName objectName = new ObjectName(objectJmxMBean.getName());
		server.registerMBean(new JMXBeanWrapper(objectJmxMBean.getObject()), objectName);
	}
	catch(MalformedObjectNameException |
		  InstanceAlreadyExistsException |
		  MBeanRegistrationException |
		  NotCompliantMBeanException |
		  IntrospectionException e) {
		System.err.printf("[CanonicalName] %s - ERROR: %s %n", e.getClass().getCanonicalName(), e.getMessage());
	}

}

The important part of above is: new JMXBeanWrapper(objectJmxMBean.getObject())

Until here I did do all the instructions according with the JMXBeanWrapper documentation shared in the link in the top of this post and even from the author's post:

• Adding descriptions to JMX beans using an annotation wrapper

When I run the Main app, through either JConsole or VisualVM I can see the annotations being applied and working how is expected, therefore until here the goal seems been accomplished.

Problem: the problem is when I do click to either of them arises:

The complete error message is:

Problem invoking stopMain: 
java.lang.IllegalAccessException 
Class com.udojava.jmx.wrapper.JMXBeanWrapper can not access a member of class 
com.manuel.jordan.jmx.admin.MainJmx with modifiers "public"

Observation: seems the error is thrown directly by JConsole or VisualVM, because according with the JMXBeanWrapper.java source code, there is no the throw new IllegalAccessException statement with the part of that message with modifiers "public"

Note & Observation: according with the project shared on Github, it was tested with JDK 6 and I am using/working with JDK 8.

What could be wrong or missing in the configuration?

The solution is the following:

Edit from:

@JMXBean(description="Administrates the Main app", sorted=true)
class MainJmx implements MainJmxMBean {

    private boolean isMainRunning;

    MainJmx() {
        isMainRunning =true;
    }

To

@JMXBean(description="Administrates the Main app", sorted=true)
public class MainJmx implements MainJmxMBean {

    private boolean isMainRunning;

    MainJmx() {
        isMainRunning =true;
    }

Conclusion: the JMXWrapper needs that the class annotated with @JMXBean must be public.

How you can see the constructor can remain being package default