Adding Java EE into existing Eclipse IDE

Question

I wanted to add Java EE 7 into Eclipse Mars, but don't know how. How do I do this?

Answer 1

one way;

download javaee-api-7.0.jar

copy it any location on your computer (say /path/to/javaee/javaee-api-7.0.jar)

then, from eclipse menu

window > preferences > Server > Runtime Environments > Add > Basic > J2EE Runtime Library > Next > (Select /path/to/javaee) > Finish

then, add this runtime to your (needed) projects' classpath by

right click on project > Properties > Java Build Path > Libraries > Add Library > Server Runtime > Next > (Select) J2EE Runtime Library > Finish  

another way;

you can download a java ee 7 compatible server (listed here) adapter from eclipse marketplace and its runtime,

then, add this runtime to your (needed) projects' classpath by

right click on project > Properties > Java Build Path > Libraries > Add Library > Server Runtime > Next > (Select) (downloaded server) > Finish

Answer 2

Follow this link..

Open the Opens the Installed JREs preference page Java > Installed JREs preference page. Select the Add... button. The Add JRE wizard opens. You will have to select the type of JRE you would like to create: Standard VM - You will select a folder where the JRE is installed. The details of the JRE will be determined by scanning the location. You can further customize the JRE install, specifying vm arguments, source attachments, etc. Standard VM 1.x.x - Same options as a standard VM install, but the install is customized to handle the 1.x.x install Execution Environment Description - You will select an execution environment (EE) file that describes all the details required to set up the JRE. You will be able to customize some aspects of the install.

http://help.eclipse.org/mars/index.jsp?topic=%2Forg.eclipse.jdt.doc.user%2Freference%2Fpreferences%2Fjava%2Fdebug%2Fref-installed_jres.htm