Erwin, I don't personally use JavaBeans, however, I did find some
information on the java site that may help you out. Beyond this I
don't know what else can be said. . . .
<quote>
Java Beans can be used on the server side within the Webserver to
provide some functionality.They can be used to connect to the Backend
where the EJBs are placed.
However, You can put your Java Beans into the EJB jar file which you
later deploy into the container. But you cannot deploy your Java Bean
into the container.
</quote>
<quote>
Actually, a JavaBean is any class that follows the getter/setter
methods converntion and has a default constructor. To be absolutely
formal, even getter/setters are not requried, and only a public
constructor is required.
JavaBeans are components that can be assembeled together using
grpahical tools, and whose properties can be set visually using these
tools. A JavaBean exposes a set of properties, and a set of events.
Enterprise JavaBeans are similar to JavaBeans in that they are
components that can be assembeled together to an application. They also
have environment properties, which are similar to a JavaBeans
properties.
However, an Enterprise JavaBean is a Java class which obeys many
contraints defined by the EJB specification and that are not mandatory
for JavaBeans.
While JavaBeans are local classes which usually run on the same JVM as
the caller, EJBs are "server components" which run on a different JVM,
possibly on a different computer, and inside an EJB container.
The details of EJBs are far too complicated to explain on this post.
They are devided into types (session, entity), each types has subtypes
(persistence types, transaction management types), etc.
</quote>
----- Original Message -----
From: Erwin <[EMAIL PROTECTED]>
Date: Sunday, March 25, 2001 5:57 pm
Subject: Re: JavaBeans Components vs. EJBs
> Thanks guys, but I'm still in doubt. I *have* heard of Java Beans
> which are
> GUI components, but aren't they strictly client-side? Can they be
> used on
> the server??
> The material I was reading seemed to refer to server-side JavaBeans
> components. It says basically, "JSPs can use JavaBeans for application
> logic and storing data, but that should preferably be in EJBs."
> In fact, they mentioned JavaBeans in the chapter on "Web Tier"
> instead of
> "Client Tier"
>
> Pls see (http://java.sun.com/j2ee/blueprints/web_tier/jsp_page_design)
>
> I read through some other articles on other sites, mentioning
> JavaBeans,but they all seem to be talking about client-side stuff.
> I'm getting pretty confused here. Any help is greatly appreciated.
>
> Thanks
> -Erwin
>
> At 07:45 AM 3/26/01 +0800, you wrote:
> >Hi. Yes, you're right. There's a difference between "Java
> Beans" and
> >"Enterprise Java Beans". While both are similar in the fact that
> they use
> >the "reusable" philosophy, they are actually quite different.
> >
> >Java Beans are strictly programmed GUI components. A program can
> then use
> >these beans and "drop" them into an application. Hence, a Java
> Bean can be
> >purchased and then "dropped" into your project.
> >
> >Enterprise Java Beans are non-GUI server-side components. When
> talking>about EJBs, you'll often hear about "business logic".
> This refers to the
> >bean's ability to encapsulate certain "business logic" methods - like
> >accessing your bank account, or updating a user database. EJBs
> come in two
> >flavors - session beans and entity beans. Session beans
> basically provide
> >a service, such as accessing your bank account. Entity beans
> basically>represent data, such as your bank account itself.
> >
> >Hope this helps.
> >
> >Stanley Tan
> >
> >At 08:51 PM 3/25/01 +0530, you wrote:
> >>Hi
> >>
> >>I was going through the J2EE BluePrints online
> >>(http://java.sun.com/j2ee/blueprints). There seems to be a
> difference>>between "JavaBeans components" and "Enterprise beans".
> Could somebody
> >>explain to me the difference?
> >>And where do "Session beans" and "Entity beans" fit in??
> >>
> >>Thanks in Advance
> >>-Erwin
>
>
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