we trying upgrade jboss 4 jboss 6 , receive following error when deploying our grails 1.3.2 war: 09:53:33,343 info [jmxkernel] legacy jmx core initialized 09:53:37,515 info [abstractserverconfig] jboss web services - stack cxf server 3.4.1.ga 09:53:38,000 info [jsfimplmanagementdeployer] initialized 3 jsf configurations: [mojarra-1.2, myfaces-2.0, mojarra-2.0] 09:53:42,515 warning [fileconfigurationparser] aio wasn't located on platform, fall using pure java nio. if platform linux, install libaio enable aio journal 09:53:52,593 warn [classloadermanager] unexpected error during load of:groovy.jmx.builder.package-info: java.lang.classformaterror: illegal class name "groovy/jmx/builder/package-info" in class file groovy/jmx/builder/package-info @ java.lang.classloader.defineclass1(native method) [:1.6.0_20] @ java.lang.classloader.defineclasscond(unknown source) [:1.6.0_20] @ java.lang.classloader.defineclass(unknown ...