Oracle SQL Developer 3.1 is available for Windows XP , Vista (including 64-bit), Windows 7 (including 64-bit), and Windows Server 2008, Linux or Mac OS X.Oracle SQL Developer 3.1 release is shipped with JDK 1.6.0_11. You can use the embedded JDK or connect to any installed JDK 1.6.0_11 or above.
The Check for Updates option to upgrade between releases of SQL Developer is not supported. This utility is provided to install third party extensions, this includes the third party drivers required for migrations and to add additional version control extensions.SQL Developer supports IBM DB2 UDB LUW , Microsoft SQL Server and Microsoft Access, MySQL, Sybase Adaptive Server and Teradata. See Supported Platforms for details on all third party database releases supported. There are a number of different forums supporting the features in SQL Developer. When using the forums, be sure to use clear subject lines to initiate a thread and try to avoid using old, unrelated threads for a new issue.