How to configure use-parent-handlers in JBoss EAP 6

Issue

• How to configure use-parent-handlers in Jboss eap6
• Problems with logger category:

            <logger category="com.redhat.gss" use-parent-handlers="false">
                <level name="INFO"/>
                <handlers>
                    <handler name="FILE"/>
                </handlers>
            </logger>

The traces are not seeing in the server.log

• Using additivity=false with logger in EAP 6.1 and causes following error :

ERROR [org.jboss.as.server] (Controller Boot Thread) JBAS015956: Caught exception during boot: org.jboss.as.controller.persistence.ConfigurationPersistenceException: JBAS014676: Failed to parse configuration
    at org.jboss.as.controller.persistence.XmlConfigurationPersister.load(XmlConfigurationPersister.java:141) [jboss-as-controller-7.2.0.Final-redhat-8.jar:7.2.0.Final-redhat-8]
    at org.jboss.as.server.ServerService.boot(ServerService.java:308) [jboss-as-server-7.2.0.Final-redhat-8.jar:7.2.0.Final-redhat-8]
    at org.jboss.as.controller.AbstractControllerService$1.run(AbstractControllerService.java:188) [jboss-as-controller-7.2.0.Final-redhat-8.jar:7.2.0.Final-redhat-8]
    at java.lang.Thread.run(Thread.java:619) [rt.jar:1.6.0_21]
Caused by: javax.xml.stream.XMLStreamException: ParseError at [row,col]:[106,21]
Message: JBAS014788: Unexpected attribute 'additivity' encountered
    at org.jboss.as.controller.parsing.ParseUtils.unexpectedAttribute(ParseUtils.java:105) [jboss-as-controller-7.2.0.Final-redhat-8.jar:7.2.0.Final-redhat-8]

. . . .

• We have defined a log handler where application log messages are sent into the separate log file. However the logs are getting printed in server.log as well as application.log file. How to send log meassages only in application.log file?