Classifer4J is a java library that provides an API for automatic
classification of text, including Bayesian classification. Version 0.3 is the first version recommened for general use.

Some of the many improvements include:

• The ability to train the BayesianClassifier via a ITrainable interface, rather than requiring updates
  to the datasource.
• Performance and design improvements to the JDBCWordDataSource.
• Stop Word support.
• Internal Refactoring, particually with respect to the WordProbability object (thanks to Pete Leschev).

Classifier4J is available from http://classifier4j.sourceforge.net/