• workspace structure:
• hbm/
• build.xml
• hibernate.cfg.xml
• reveng.xml

• lib/

• build.xml

• hibernate.cfg.xml

  true oracle.jdbc.driver.OracleDriver jdbc:oracle:thin:@127.0.0.1:1522:WITRDB witr witr org.hibernate.dialect.Oracle10gDialect false

• reveng.xml

  ...etc

then type

> cd hbm
> ant

your hibernate beans are ready in hbm/generated directory