Java bean is nothing but a class that implements java.io.Serializable interface and uses set/get methods to project its properties. Since they are reusable instance of a class Java beans provides the flexibility to JSP pages.

There are three basic actions or tags used to embedd a java bean into a jsp page they are <jsp:useBean>, <jsp:setProperty>, <jsp:getProperty>.

This tag is used to associate a bean with the given "id" and "scope" attributes.

This tag is used to set the value for a beans property mainly with the "name" attribute which defines a object already defined with the same scope. Other attributes are "property", "param", "value"

This tag is used to get the referenced beans instance property and stores in implicit out object.

• Package should be first line of Java bean
• Bean should have an empty constructor
• All the variables in a bean should have "get", "set" methods.
• The Property name should start with an Uppercase letter when used with "set", "get" methods.
• For example the variable "name" the get, set methods will be getName(), setName(String)
• Set method should return a void value like "return void()"

    package pack;
    public class Counter
    {
      int count = 0;
      String name;
      public Counter() { }
      public int getCount() 
       {
        return this.count;
       }
      public void setCount(int count){
       this.count = count;
       }
	public String getName(){
		return this.name;
	}
	public void setName(String name){
		this.name=name;
	}
      }

   <%@ page language="java" %>
   <%@ page import="pack.Counter" %>
   </body>
   <jsp:useBean id="counter" scope="page" class="pack.Counter" />
   <jsp:setProperty name="counter" property="count" value="4" />
   Get Value: <jsp:getProperty name="counter" property="count" /><BR>
   <jsp:setProperty name="counter" property="name" value="prasad" />
   Get Name: <jsp:getProperty name="counter" property="name" /><BR>

In the above examples the bean that is being included is Counter.java, that has defined the set/get properties for the "counter", "name" objects. Using the bean.jsp page first the bean is included using the <jsp:useBean> action, using the <jsp;setProperty> we set the property of "counter" to "4" and for "name" it set to "prasad". With the <jsp:getProperty> we get the values.