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The jsp:useBean Tag
Whenever we want to include business logic and data in a JSP page, JavaBeans are the best way to do it. And to let us accomplish this we use the jsp:useBean tag.
When you use jsp:useBean, the container performs several actions. Basically, it instantiates the object in memory and provides a variable name for you to use within the scope you set in the tag. If the bean class hasn't been loaded, the container will try to locate it and load it. The container creates the bean and stores it as an attribute of the scope object. The value of the id attribute determines the name of the bean within the object scope. Using this name, you can access this bean inside your JSP.
The typical syntax of useBean usage is:
typeSpec ::= class="className" |
class="className" type="typeName" |
type="typeName" class="className" |
beanName="beanName" type="typeName" |
type="typeName" beanName="beanName" |
type="typeName"
The id and scope are easy. The confusion always comes up about the usage of the typeSpec. The container will always look for the Bean. However, if the typeSpec is used one way, the container will throw an exception if it can't find that Bean (not already instantiated). If it is used another way, it will create a new instance of the Bean if one hasn't been created already.
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