The operations during communication failure are enabled when communication failure occurs during the invocation of the EJB method defined as the remote interface. Invocation of the EJB method indicates the following:

• Invocation of EJB from a Web application
• Invocation of EJB from the EJB client
• Invocation of EJB from another EJB

The following figure shows the communication for which the settings are enabled:

Figure 2-33 Communication for which the settings are enabled

Note that the settings are disabled in the following cases:

• Invocation of the EJB method defined as a local interface
• Invocation of the EJB method defined as a remote interface within the range in which optimization of local invocation is enabled
• Invocation of the Naming Service

Depending upon the system type, Hitachi recommends the following settings:

In the case of a search and reference node system

Hitachi recommends that you specify the settings for re-establishing the connection and resending the requests. Consequently, the results can be acquired without facing failure in requests.

In the case of an update node system

Hitachi recommends that you specify the settings for not executing either re-establishment of the connection or resending of requests. In an update node system, if you specify the settings for re-establishing the connection and resending the requests, there is a risk of sending duplicate requests.