Sun Microsystems GlassFish Enterprise Server 2.1 Administration Manual page 146

Admin Console Tasks for Transactions
When the transaction spans across servers, the server that started the transaction can contact
the other servers to get the outcome of the transactions. If the other servers are unreachable, the
transaction uses the Heuristic Decision field to determine the outcome.
In the tree component select the Configurations node.
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Select the instance to configure:
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Select the Transaction Service node.
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To enable the recovery of incomplete transactions, check the Recover in the On Restart field.
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Set the amount of time, in seconds, the Enterprise Server tries to connect to the unreachable
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server in the Retry Timeout field. The default value is 10 minutes (600 seconds).
Set the policy for unreachable servers in a transaction in the Heuristic Decision field.
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Unless there is a good reason to set this field to Commit, leave Heuristic Decision set to
Rollback. Committing indeterminate transactions can compromise the data integrity of your
application.
Set any needed properties.
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Click the Add Properties button, type values in the Name and Value fields, and check the box to
the left of the Name to activate the property.
Click Save.
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Restart the Enterprise Server.
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To set a transaction timeout value
By default, the server does not timeout a transaction. That is, the server waits indefinitely for a
transaction to complete. If you set a timeout value for transactions, if a transaction isn't
completed within the configured time, the Enterprise Server rolls back the transaction.
In the tree component, select the Configurations node.
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146 Sun GlassFish Enterprise Server 2.1 Administration Guide • December 2008
To configure a particular instance, select the instance's config node. For example, the default
instance, server, select the server-config node.
To configure the default settings for all instances, select the default-config node.