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MySQL NDB Cluster API Developer Guide
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4.2.3 Using Connector/J with NDB Cluster

JDBC clients of an NDB Cluster data source, and using Connector/J 5.0.6 (or later), accept jdbc:mysql:loadbalance:// URLs (see Configuration Properties), with which you can take advantage of the ability to connect with multiple MySQL servers to achieve load balancing and failover.

However, while Connector/J does not depend on the MySQL client libraries, it does require a connection to a MySQL Server, which ClusterJ does not. JDBC also does not provide any object mappings for database objects, properties, or operations, or any way to persist objects.

See MySQL Connector/J Developer Guide, for general information about using Connector/J.