Can anyone tell me how i could refe

[blues77]

Can anyone tell me how i could reference a javabean in a servlet? basically i have a bean that calculates the total of some purchases and i want to use this bean in a servlet. Any suggestions?

 

[palbano]

Well the most difficult part of that is the CLASSPATH type of issues. In other words getting the bean (class/jar) file in the proper location under the Web Server to be visible to the Server Engine and Servlet.

After that you just use it as you would any Java class in your Servlet code:

MyBean mb = new MyBeen();
.... etc.

-pete

 

[pedrosolorzano]

Hi blues77:

It also depends on what type of bean are you trying to instantiate. For example, if you want to instantiate a session bean, you shouldn't create one every time, only if it hasn't been created, depending on the scope. Here is an example:

YourSessionBean yourSessionBean = null;
synchronized (session) {
        yourSessionBean = (YourSessionBean)
        pageContext.getAttribute("yourSessionBean",PageContext.SESSION_SCOPE);
        if ( yourSessionBean == null ) {
                try {
                        yourSessionBean = (YourSessionBean) Beans.instantiate(
                                                                getClassLoader(), 
                                                                "YourSessionBean"
                                                                );
                }catch (Exception exc) {
                        throw new Exception(" Cannot create bean of class YourSessionBean \n"+exc);
                }
                pageContext.setAttribute("yourSessionBean", 
                                        yourSessionBean, 
                                        PageContext.SESSION_SCOPE
                                        );
        }
}

Note that YourSessionBean is a bean and yourSessionBean is an instance of that bean.

For a stateless Bean the process would be different.

Hope it helps. Pedro Andrés Solorzano
Pontificia Universidad Javeriana
Bogotá, Colombia, SurAmérica.

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