Now, The question is How to retrieve the information about a given java bean class(I mean compiled class). That information is also known as Metadata:
    There are again 2 ways! And its based on how we have describe the Bean. As seen in previous tutorial – Link
    We have 2 methods to describe a Bean.

    1. Naming Conventions
    2. By writing an additional class that extends the BeanInfo interface

    1. Naming Conventions.

    import java.beans.*;
public class EmpIntrospector 
{
	public static void main(String args[]) 
	{
		try 
		{
			Class c = Class.forName("Employee");
			BeanInfo beanInfo = Introspector.getBeanInfo(c);
			System.out.println("Properties:");
			PropertyDescriptor propertyDescriptor[] = beanInfo.getPropertyDescriptors();
			for(int i = 0; i < propertyDescriptor.length; i++) 
			{
				System.out.println("\t" + propertyDescriptor[i].getName());
			}
			System.out.println("Events:");
			EventSetDescriptor eventSetDescriptor[] = beanInfo.getEventSetDescriptors();
			for(int i = 0; i < eventSetDescriptor.length; i++) 
			{
				System.out.println("\t" + eventSetDescriptor[i].getName());
			}
		}
		catch(Exception e) 
		{
			System.out.println("Exception caught. " + e);
		}
	}
}

    In above sample code we are retrieving metadata by getting propertyDescriptor[] / eventDescriptopr[] using beanInfo Interface.

    2. By writing an additional class that extends the BeanInfo interface.

    import java.beans.*;
public class EmpIntrospector2
{
	public static void main(String args[]) 
	{
		try 
		{
			Class c = Class.forName("Employee");
			BeanInfo beanInfo = Introspector.getBeanInfo(c);
			System.out.println("Properties:");
			PropertyDescriptor propertyDescriptor[] = new EmployeeBeanInfo().getPropertyDescriptors();
                        for(int i = 0; i < propertyDescriptor.length; i++) 
			{
				System.out.println("\t" + propertyDescriptor[i].getName());
			}
			System.out.println("Events:");
			EventSetDescriptor eventSetDescriptor[] = new EmployeeBeanInfo().getEventDescriptors(); 
			for(int i = 0; i < eventSetDescriptor.length; i++) 
			{
				System.out.println("\t" + eventSetDescriptor[i].getName());
			}
		}
		catch(Exception e) 
		{
			System.out.println("Exception caught. " + e);
		}
	}
}

    In above sample code we are retrieving metadata by getting propertyDescriptor[] / eventDescriptopr[] using our defined class “EmployeeBeanInfo” which was describing Employee bean.