Today I tried to deploy jee/booking example that comes with seam. I followed chapter 26 of the seam_reference. I used the nightly build of Seam 09/18/2007, (jboss-seam-CVS.2007-09-18_08-34-50) While trying to deploy the app on OC4J, I got "EjbSynchronizations must implement serializable" exception. I had to update seam source code and rebuild seam. There are some missing dependencies that may be mentioned in the Chapter 26.1.1 of seam_reference.pdf The complete list of libraries I had to add were as follows: antlr-2.7.6.jar antlr-runtime-3.0.jar commons-beanutils-1.7.0.jar commons-digester-1.6.jar core-3.2.3.v_686_R32x.jar drools-compiler-4.0.0.jar drools-core-4.0.0.jar ejb3-persistence.jar hibernate-annotations.jar hibernate-entitymanager.jar hibernate-search.jar hibernate3.jar hsqldb.jar janino-2.5.7.jar jboss-archive-browsing.jar jboss-common.jar jboss-el.jar jboss-jaxws.jar jboss-seam-debug.jar jboss-seam-jee5.jar jboss-seam-ui.jar jboss-seam.jar jbpm-jpdl.jar jsf-api.jar jsf-facelets.jar jsf-ri.jar mvel14-1.2rc1.jar readme.txt richfaces-api-3.1.1-SNAPSHOT.jar richfaces-impl-3.1.1-SNAPSHOT.jar richfaces-ui-3.1.1-SNAPSHOT.jar sun-commons-beanutils.jar sun-commons-collections.jar sun-commons-digester.jar sun-commons-logging.jar thirdparty-all.jar It is strange to note that oc4j complained for some of the jars which it knows the location but somehow could not use for classloading. I had to copy those jars into j2ee/home/applib folder. Then everything worked fine. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4086142#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...