It's a bug of seam-gen 2.0. It's generate Eclipse project with Seam nature but without Seam builder. So the project is incorrect. Please add | <buildCommand> | <name>org.jboss.tools.seam.core.seambuilder</name> | <arguments> | </arguments> | </buildCommand> | to .project or just disable Seam support and enable it again (it removes the nature and re-add it with our builder) View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4216772#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...