Topic messages are sent to all shared non-durable subscription participants --------------------------------------------------------------------------- Key: WFLY-8579 URL: https://issues.jboss.org/browse/WFLY-8579 Project: WildFly Issue Type: Bug Components: JMS Affects Versions: 10.1.0.Final Reporter: Scott Van Wart Assignee: Jeff Mesnil Attachments: duplicate-shared.zip I have two MDBs with a subscription to a topic. The same clientId and a subscriptionName are specified in the activation config properties for each MDB. subscriptionDurability is omitted (defaulted to NonDurable). When I send a single message to this topic, both MDBs receive the message. According to JSR 343, 8.3.2 Shared non-durable subscriptions: bq. A non-durable shared subscription is used by a client that needs to be able to share the work of receiving messages from a non-durable topic subscription amongst multiple consumers. A non-durable shared subscription may therefore have more than one consumer. *Each message from the subscription will be delivered to only one of the consumers on that subscription.* Setting the subscriptionDurability property to Durable works as expected (each message is delivered to only one consumer in that subscription).