Can I use Liferay DXP activation key of "7.1" in "7.4"? - liferay-7

Currently, we are using Liferay DXP 7.1 and exploring new features of Liferay 7.4. It seems like Liferay DXP 7.4 will be more helpful for us since it comes with numerous new features out of the box.
If we have to move on Liferay DXP 7.4, we will be able to use the existing Liferay activation key (of 7.1) or we need to purchase a new activation key for Liferay DXP 7.4?

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How can i setup Liferay 6.2 tomcat8 server configuration in eclipse or liferay studio? Is it supportable?

Actually i am not able to configure tomcat8 server in eclipse or liferay studio as liferay plugin is showing only 6.2 with tomcat7 option not 6.2 with tomcat8.
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Looking at Liferay's 6.2 Compatibility Matrix, it looks like Tomcat 8 is a supported EE configuration when patched to SP15+.
I'd imagine that using a Tomcat 8 server with Liferay would be simpler in their studio than with basic Eclipse, and could probably be accomplished by:
Setting up a manual installation on an existing Tomcat 8 server
(that you've configured) using the Liferay .war (detailed steps can
be found here)
Creating a new Liferay Workspace in Dev
Studio, but deselect the "Download Liferay bundle" checkbox when
creating the workspace, and configure the workspace’s
gradle.properties file to point to the pre-existing bundle by
setting the liferay.workspace.home.dir property.
Alternatively, you could set up Liferay's Plugins SDK to be used with your Liferay version/application server of choice.
If you already have existing projects in Eclipse, though, you could probably modify the steps in this article to use a 6.2 Liferay .war with Tomcat 8 in Eclipse.

Vaadin Liferay Portlet Project using Liferay 6.0.6 and Eclipse Luna

I have a question about Vaadin Liferay Portlet. I'm new for this.
I have to use an old Liferay Portal (6.0.6).
I have to develop a new Vaadin portlet in this portal.
I downloaded Eclipse Luna IDE and I installed liferay-plugins-sdk-6.0.6-20110225 and Liferay IDE
I tried to create new Vaadin Liferay Portlet project (New Project -> Vaadin Liferay Portlet) but I obtain this alert message:
There are no suitable Liferay plugin project available for this new
Liferay Vaadin Portlet. Open the new Liferay Plugin Project wizard
now?
I tried to select
YES
option.
I completed all wizard steps.
In one of these steps I can select the type of Portlet:
I selected Vaadin Portlet and I see this error:
At the end of this wizard I can see the portlet project folder but there are some issues.
In particular I find these errors:
Can't I create a Vaadin Portlet Project using this Liferay Portal version and corresponding Liferay plugins (6.0.6)?
How can I create my Vaadin Liferay Portlet?

Tutorial for creating own portlet in liferay with eclipse

I want to create My Own Portlet With the Eclipse JUNO for Liferay. I have googled a lot but that's provide me only for using with netbeans so can anyone guide me or give me link of the tutorial for the creating portlet from scratch in eclipse.
I have tried with the following
ADD-> new Liferay Projects
And then its not showing in a liferay the portlet which i have created
I have successfully installed liferay in my windows7 as well as i have also integrated ready made books portlet but just having while creating simple hello world portlet of my own
very before i have even follow this link http://www.youtube.com/watch?v=-EbyIbMWrCI
but its showing my portlet in update manager option in admin account as a status is "UNKNOWN"
For creating a portlet at Eclipse please have a look at Liferay development in Eclipse .
For getting ready portlet visible on Liferay you could find instructions for example on this: How to deploy portlets to Liferay?
Here is the installation guide and getting started tutorial.

How to integrate JasperServer into Liferay

How can I integrate JasperServer 4 to Liferay 6? I found an article that describes how to integrate JasperServer CE 3.7.0 into Liferay 6.0.5. But I doubt that it won't be applicable to version 4. I check http://sourceforge.net and found a portlet for JasperServer 3.7.1. However, there is no JasperServerPortlet for version 4 in the web site.
There's one here:
http://sourceforge.net/projects/jasperserver/files/JasperServer/JasperReports%20Server%204.7.0/ - JasperReportsServer-portlet-4.7.0.war
Note though that it's intended for JBoss portal, so it's possible something won't work in Liferay. Unfortunately, this would mean you'd have to develop your own integration for Liferay.

Portlet Development with Tomcat and Eclipse

I'm starting to learn some portlet development. I'm wondering if there are any good (preferably recent since many of the guides I saw date back a few years) Hello Portlet or beginners guides. I have eclipse set up but I'm not sure what plugins/libraries/etc I need to start developing portlets for a Tomcat server.
Any help would be appreciated!
Liferay Portal (open source portal) has a set of eclipse plugins called Liferay IDE. If you set it up and also setup a Liferay Plugin SDK (zip download), then use the New Liferay Project wizard after installing the Liferay IDE plugins you will have everything you need. You can see the Liferay IDE Getting Started guide for how to deploy your first portlet to Liferay.