第二种方式
Help -> Software updates -> Find and install....
Choose "Search for new features to install".
Click Add Update Site..., and type "jboss" for Name and " http://download.jboss.org/jbosstools/updates/JBossTools-3.0.3.GA" for URL.
Check the box of the "FreeMarker" feature.
"Next"-s until it is installed...
原文：http://www.cnblogs.com/toSeeMyDream/p/4625805.html