Weka is a collection of machine learning algorithms for data mining tasks. The algorithms can either be applied directly to a dataset or called from your own Java code. Weka contains tools for data pre-processing, classification, regression, clustering, association rules, and visualization. It is also well-suited for developing new machine learning schemes.
Look at the Bayesian Network Classifiers, FAQ at:
There is also a bigger comprehensive documentation at:
Source: Weka FAQ