Using Oracle 11 g drivers (ojdbc5.jar) with Websphere Application Server 6.1 :
If you change your provider and datasource to use 11g drivers make sure you select the 11g data store helper and make sure the datasource custom property
oracle9iLogTraceLevel is blank, to avoid having the 9i or 10g API called.

You can get the following error otherwise :
java.lang.NoSuchMethodError: oracle/jdbc/driver/OracleLog.setLogVolume

http://www-01.ibm.com/support/docview.wss?rs=180&context=SSEQTP&dc=DB550&uid=swg1PK47930&loc=en_US&cs=UTF-8&lang=en&rss=ct180websphere

SQL Developer Data Modeler

SQL Developer Data Modeler is a free data modeling and design tool, proving a full spectrum of data and database modeling tools and utilities, including modeling for Entity Relationship Diagrams (ERD), Relational (database design), Data Type and Multi-dimensional modeling, with forward and reverse engineering and DDL code generation. The Data Modeler imports from and exports to a variety of sources and targets, provides a variety of formatting options and validates the models through a predefined set of design rules.

SVN integration also exists

Details : http://www.oracle.com/technetwork/developer-tools/datamodeler/index.html

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