The org.jboss.wsf.spi.metadata.config.AbstractCommonConfig is not thread safe and is possibly accessed / modified concurrently (at least during boot on WFLY as a consequence of WFLY-1759). The members should likely be final (and the collection ones should be initialized to concurrent collections).

Same applies to org.jboss.wsf.spi.metadata.j2ee.serviceref.UnifiedHandlerChainMetaData and org.jboss.wsf.spi.metadata.j2ee.serviceref.UnifiedHandlerMetaData.