I've just experienced the same (or similar) problem. FAILED CONFIGURATION: @BeforeClass init | java.lang.NoSuchFieldError: mainDeployer | at org.jboss.seam.mock.embedded.BootstrapWrapper.createDeploymentGroup(BootstrapWrapper.java:28) | at org.jboss.embedded.Bootstrap.deployResourceBases(Bootstrap.java:305) | at org.jboss.seam.mock.EmbeddedBootstrap.startAndDeployResources(EmbeddedBootstrap.java:16) | at org.jboss.seam.mock.BaseSeamTest.startJbossEmbeddedIfNecessary(BaseSeamTest.java:1005) | at org.jboss.seam.mock.BaseSeamTest.init(BaseSeamTest.java:929) | at org.jboss.seam.mock.SeamTest.init(SeamTest.java:42) | ... Removed 22 stack frames I had upgraded my Seam JARs from 2.0.0.CR2 to the latest 2.0.1.SNAPSHOT (I needed the DataModel fix). If I downgrade my JARs back to 2.0.0.CR2 then the Integration tests work. Short of rebuilding my project skeleton, is there any solution to this? Cheers, Damian. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4111708#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...