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During a transaction, if NuoDB throws an exception that does not close the connection then the client application can do any of the following:
While a connection remains open, NuoDB never automatically rolls back a transaction.
Some NuoDB client drivers provide exception types that represent conditions for which retrying the transaction is expected and acceptable. There are other exception types that indicate that some action on the part of the client application is required before the transaction can be retried. For example, the NuoDB JDBC driver provides transient and non-transient SQL exceptions. Upon catching a transient exception, a client application can simply retry the transaction with an expectation that it would succeed. For details, see the documentation for the driver you are using.
Note: A client application can sometimes be unable to establish a connection or re-establish a connection. This also causes an exception to be thrown, which the client application must handle. If the client application is using the NuoDB JDBC driver then it is possible that such an exception would cause another connection in the pool to be tried.