CODEWITHSUNDEEP
ejb
Developer404
Developer404

Reputation: 5972

How to call session bean from jsp

I'm new to ejb. Actually I've created one ejb and I added reference to a web application which will call the session bean simply. How to call the session bean from the jsp file?

Upvotes: 4

Views: 23168

Answers (6)

Rene Zubcevic
Rene Zubcevic

Reputation: 1

You can mix and match to support multiple application servers in the best way. The code below uses the @EJB injection for WebSphere Liberty and the InitialContext for JBoss Wildfly

<%!

@EJB
GitlabHelper gitAPI;

public void jspInit() {

    if (gitAPI == null) {

    try {
        gitAPI = (GitlabHelper) new InitialContext().lookup("java:module/GitlabHelper");
        System.out.println("<!-- initContext has been used -->");
    } catch (Exception e) {
        e.printStackTrace();
    }
    }
}

%>

Upvotes: 0

Milan
Milan

Reputation: 1

Simple..Override Jsp's jspInit method and create InitialContext object.. InitialContext object can access all the resources that have JNDI name assigned..

<%!

BeanIntefaceName instanceName;

%>   

<%
public void jspInit()
{
    instanceName = (BeanIntefaceName)new InitialContext().lookup("java:global/[application_name]/[module_name]/[enterprise_bean_name]/[inteface_name]");
}

instanceName.yourMethodName();
%>

Upvotes: 0

martins.tuga
martins.tuga

Reputation: 1732

I've tried to do that on Wildfly, but without success using @EJB annotation, probabily JSP don't have CDI. So I've implemented it on another way (not so bright):

Before the :

<%
    LoginAction loginAction;

    try {
        Properties properties = new Properties();
        properties.put("jboss.naming.client.ejb.context", true);
        properties.put(Context.URL_PKG_PREFIXES,"org.jboss.ejb.client.naming");
        Context ctx=new InitialContext(properties);
        loginAction = (LoginAction) ctx.lookup("java:module/LoginAction");

        session.setAttribute("loginAction", loginAction); //this is to be able to use loginAction on EL Expressions!
    } catch (Exception e) {
        e.printStackTrace();
    }
%>

And all the rest stays the same!

Upvotes: 2

Sai prateek
Sai prateek

Reputation: 11926

As you are using EJB at service layer and in MVC , I will never advice to call a session bean from your view or jsp.you can call the session beans method by injection EJB reference using @EJB annotation.

Upvotes: 0

rgksugan
rgksugan

Reputation: 3582

I could also prefer you to use the MVC model for your application. In that case there is no need to call a session bean from the jsp, you can call it from the servlets itself.

Check out this link to call a EJB from a servlet. Click

Upvotes: 4

rgksugan
rgksugan

Reputation: 3582

1) the first way will be to create a direct object

use import tag to import ur class

< % @ page import = packageName.Classname %>
    <%
    @EJB
    Classname object = new Classname();
    %>

and then access methods using normal jsp

<%=object.callmethod()%>

2) the other way will be to use standard actions

<jsp:useBean id="beanId' class="packagename.ClassName" />
<jsp:getStudentInfo name="beanId" property="name"/>

Upvotes: 0

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