Sun Java System Application Server Enterprise Edition 8.1 2005Q2 High Availability Administration Guide

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## Requirements

A distributed session can run in multiple Sun Java System Application Server instances, if:

- Each server instance has access to the same high-availability database (HADB). For information about how to enable this database, see configure-ha-cluster(1).

- Each server instance has the same distributable web application deployed to it. The `web-app` element of the `web.xml` deployment descriptor file must contain the `distributable` element.

- The web application uses high-availability session persistence. If a non-distributable web application is configured to use high-availability session persistence, the server writes an error to the log file.

- The web application must be deployed using the `deploy` or `deploydir` command with the `--availabilityenabled` option set to `true`. For more information on these commands, see deploy(1) and deploydir(1).

- Previous: Chapter 7 Configuring Node Agents
- Next: Restrictions

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