Didn't you notice this in you server.log ?
ERROR [org.jboss.nukes.system.JDBCPersistenceManager] Cannot sync attribute org.jboss.nukes.utils.ConversionException: A property editor has not been found for type java.util.Map at org.jboss.nukes.utils.Tools.findEditor(Tools.java:777) at org.jboss.nukes.utils.Tools.fromObject(Tools.java:831)
private void setDefaultValues(Map defaultValues) { this.defaultValues = defaultValues; }