You are asked to configure Node Manager for your production environment. You are considering whether to use the Java version or the script-based version of Node Manager.
Which statement correctly describes the difference between the two versions?
Java-based Node Manager runs within a Java Virtual Machine (JVM) process. It is recommended that you run it as a Windows service on Windows platforms and as an operating system service on UNIX platforms.
For UNIX and Linux systems, WebLogic Server provides a script-based version of Node Manager.
Your clients are connected to distributed destinations to consume messages sent to various JMS topics.
Recently, JMS connections got interrupted due to a network failure and your clients dropped their connections as well.
How would you ensure seamless failover for your clients when a distributed destination fails? (Choose the best answer.)
A simple way to failover a client connected to a failed distributed destination is to write reconnect logic in the client code to connect to the distributed destination after catching onException.
References:
You are concerned with messages being received systematically. You designed Message-Driven beans (MDB) to guarantee the most reliable way to consume messages.
In which three scenarios would JMS always redeliver a message? (Choose three.)
An MDB pool processes each message at least once. Potentially, a message can be process more than once:
* If an application fails, a transaction rolls back, or the hosting server instance fail during or after the onMessage() method completes but before the message is acknowledged or committed, the message will be redelivered and processed again.
* Non-persistent messages are also redelivered in the case of failure, except for the case where the message's host JMS server shuts down or crashes, in which case the messages are destroyed.
To ensure that a message is processed exactly once, use container-managed transactions so that failures cause transactional MDB work to rollback and force the message to be redelivered.
Under a normal startup scenario, a managed server contacts the administration server to get its configuration information.
However in case the administration server is not available, which mechanism can be used by the managed server to start up successfully? (Choose the best answer.)
When a Managed Server starts, it tries to contact the Administration Server to retrieve its configuration information. If a Managed Server cannot connect to the Administration Server during startup, it can retrieve its configuration by reading configuration and security files directly. A Managed Server that starts in this way is running in Managed Server Independence (MSI) mode
You are implementing leasing functionality within your environment to ensure exclusive ownership of a cluster-wide entity.
Which type of leasing requires that Node Manager is configured and running? (Choose the best answer.)
Setting Migration Basis to Consensus leasing means that the member servers maintain leasing information in-memory, which removes the requirement of having a high-availability database to use leasing. This version of leasing requires that you use Node Manager to control servers within the cluster.
