15.3. Fields
Two fields are defined in the interface javax.jms.DeliveryMode.
NON_PERSISTENT
public static final int NON_PERSISTENT
This is the lowest-overhead delivery mode because it does not require that the message be logged to stable storage. The level of JMS provider failure that causes a NON_PERSISTENT message to be lost is not defined.
A JMS provider must deliver a NON_PERSISTENT message with an at-most-once guarantee. This means that it may lose the message, but it must not deliver it twice.
PERSISTENT
public static final int PERSISTENT
This delivery mode instructs the JMS provider to log the message to stable storage as part of the client's send operation. Only a hard media failure should cause a PERSISTENT message to be lost.
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