After you install the plugin for IBM WebSphere Application Server V7.0 Developer Tools via Eclipse Market Place you may get the following error while adding the WAS v7.0 server in eclipse:
“Secure servers are only supported with IBM JRE 6.0 or above. Use the IBM JRE from the product installation image.“
In order to resolve that error you need to add the IBM JRE v6 into eclipse configuration file eclipse.ini file:
openFile
-vm
D:\IBM\WebSphere7\AppServer\java\bin\javaw.exe
-vmargs
-Dosgi.requiredJavaVersion=1.5
-Xms40m
-Xmx512m
Sources: