On wednesday I logged a bug GUVNOR-19 indicating that I am unable to deploy Guvnor M2 in Glassfish application server. Since then, and with little sleep, I have been able to workaround the problem. To deploy Guvnor M2 release in glassfish, do the following. Download jboss-seam from http://heanet.dl.sourceforge.net/sourceforge/jboss/jboss-seam-2.1.0.CR1.t... untar it, Download drools-guvnor.war mkdir tmp cd tmp jar -xf ../drools-guvnor.war cd WEB-INF/lib rm org.jboss.seam-jboss-seam-2.1.0.BETA1.jar cp from jboss-seam/lib directory into WEB-INF/lib jboss-seam.jar hibernate-validator.jar jar up the drools again jar -cf ../drools-guvnor.war * So, in summary, you need to replace the org.jboss.seam-jboss-seam-2.1.0.BETA1.jar in guvnor lib directory with the jboss-seam.jar file from jboss-seam and add the hibernate-validator.jar file Hope that helps some people :) Ric