The Progress DataDirect Type 5 JDBC SQL Server driver delivers the best performance and scalability for Java applications connecting to Microsoft SQL Server. DataDirect Connect for JDBC provides the benefits of Type 5 features across all versions of SQL Server - including Type 5 JDBC support for Microsoft Windows Azure SQL Database.
DataDirect's SQL Server JDBC driver is the performance and scalability leader in SPECjAppServer/ECPerf benchmarks. In addition, a single SQL Server JDBC driver supports simultaneous connections to all versions of SQL Server. DataDirect Connect for JDBC solves the limitations of Type 4 JDBC drivers such as slow or inconsistent performance and inefficient use of resources.
Progress DataDirect (http://www.datadirect.com/)