The groovy-all-1.7.7.jar file in the embeddable directory of the binary ZIP file contains an invalid package-info file groovy.jmx.builder.package-info.class. I believe this is due to the src/main/groovy/jmx/builder/package-info.groovy file being incorrectly compiled. In Tomcat 7.0.0 and JBoss AS 6.0.0, this results in an exception like the one below and a deployment failure for any applications that bundle this JAR file.
Tomcat has since released a patch that issues this is a warning and allows the deployment to continue, but JBoss AS has not. Since the problem is ultimately that a legitimately invalid package-info class exists in the library, it seems most logical that the problem be resolved with Groovy and not JBoss.
I was able to resolve my issue for now by manually editing the distributable JAR file and removing the package-info.class file from it, but this is not a good permanent solution.
Here is the exception: