Need Help for creating Java portlet

[Tukaram Kanade]

Hi All,
I am new in the Java Portlet.

I want to know the setps for creating the java portlet in eclipse & how will i run it through tomcat.

please give the guidline for creating & testing the HelloWorld Portlet.
Its very Urgent.

Thank you in advance.

[Reddy Prashanth]

Hi ,

You can not run a portlet in a Tomcat. You need to have a Portal container (just like servlets needs a servlet container, A portlet needs a portlet container). There are so many open source implementations of Portal containers available like Liferay portal, JBOSS Portal , Jetspeed ..etc.

If you want to run only on Tomcat, then download "Liferay bundled with tomcat" from Liferay website. Its easy to configure and run.
To develop a portlet in eclipse, you can install the portal pack plugin for eclipse. I dont remember the url but you can search in google for "eclipse-portal-pack" easily.

[Tukaram Kanade]

Thank you very much for you reply.

I have another query,

can i integrate the already developed web application into Liferay Portlet?
If it is possible,then how can i do that.

Please Help Me.

[Reddy Prashanth]

In "LiferyaBundle with tomcat", the liferay product is integrated as default web application inside tomcat container (in /ROOT). You can also deploy your web applications inside the tomcat and access with your context path.

But to access your web application pages, inside a portal page, you need to have a portlet. The portlet should access your application (cross-context).

In the portlet doView() method , generally we'll dispatch the request to a jsp page (view.jsp). From view.jsp, you can redirect to your webapplication .

Regards
Prashanth

[Tukaram Kanade]

Thank you Prashant.
Could you please give me one example?

Lets take an example of HelloWorld which is Java web application which is developed in JSP 7 Servlet.

How can i access these helloworld application in Liferay portlet?
What changes needs for accessing this application in liferay?

[Reddy Prashanth]

Hi Tukaram,

You deploy the war file of your webapplication in the tomcat(or any server) where the Liferay is running. Now from your portlet (view.jsp), you can access the content of your webapp using cross context include like <c:import url="relative url to your webapplication resource" context="your webapplication context name" />

For this, you need to enable cross context for your portlet war file in the tomcat server.xml as shown below :

Assume that your JSR portlet is deployed in Liferay as MyFirstPortlet.war file and your webapplication (servlets and JSP) is deployed as "MyWeb.war"

  
<Context debug="0" docBase="MyFirstPortlet" path="/MyFirstPortlet" crossContext="true" privileged="true" /> 

Suppose you have a TestMe.jsp in MyWeb.war and you need to access this inside the portlet, Then, in your portlet (view.jsp),

  
<%@ taglib uri="http://java.sun.com/jstl/core" prefix="core" %>

<h3>This content is from Portlet</h3>
<core:import url="/TestMe.jsp" context="/MyWeb" />
<h3>This content is also from Portlet</h3>
  

This is a very basic example. Hope this is what your requirement is .

[Reddy Prashanth]

I couldn't attach the war/zip files here. Let me know your mail id .I'll send

[Tukaram Kanade]

Thanks Prashant,

Mail ID = [email protected]

enable cross context part is not getting.

could you please help me regarding this issue.

[Reddy Prashanth]

Hi,

By default Tomcat will not allow access to the resources of one web application in the other web application. We need to mention in the server.xml (TOMCAT/conf/) file for which web application we want to enable this cross context access.


Here I am trying to access a jsp of another web application in my portlet (my portlet is also a WAR file), so added that entry in the server.xml (before closing tag of </HOST>).

I'll send you both the war files.

I assume that you know how to deploy a portlet war file in liferay. You can simply copy the portlet war file into the hot deployment directory (on windows it is <your home dir>/liferay/deploy). If you start the tomcat, the liferay will pick this war file automatically. Thus you can deploy your portlets dynamically.

Regards
Prashanth

[Tukaram Kanade]

Hey Prashant,
Thank you much for your valubale help.

I will check it out.
For testing this application should i require jstl.jar & standared.jar files.

I will give you replay.

Once again thanks.

I had another query

Can i integrate GWT application with the Liferay Portlet.
If i can then how will i do that?
could you please help me regarding this GWT application.

[Reddy Prashanth]

Hi Tukaram,

As we are using the JSTL tag libraries in the jsp, we need these jar files.

I dont have much knowledge on GWT. But Liferay portal is a pure java implementation. So you can integrate with GWT too. I'll also try to do that and let you.

Regards
Prashanth

[Tukaram Kanade]

Ok, once you do that please let me know.

I am also trying for that & let you know once it get completed.

These two jar files need to be put in the MyFirstPortlet lib folder.

Am i right?

[Tukaram Kanade]

Hi Prashant,
I have not recived your mail.

Please send me the war files, i am waiting for your mail.

Thanks

[Reddy Prashanth]

Sorry for that, I sent you now.

[Tukaram Kanade]

Hi Prashant,

Thank you so much.

Its working now.

can i get good books or any material for Liferay Portlet.

[Tukaram Kanade]

Hi Prashant,

Could you also send me the war file of JSP/Servlet Project?

Thank you.

[radmadsad bad]

Hi prashant and tukaram,

I would really appreciate it if you can send me a copy of the web application to my email id as well. I have been trying to do this since a couple of days. Had no luck.
Thanks,
MY email id is
[email protected]
thanks