  OpenJML is a tool for checking code and specifications of Java programs. We
describe our experience building the tool on the foundation of JML, OpenJDK and
Eclipse, as well as on many advances in specification-based software
verification. The implementation demonstrates the value of integrating
specification tools directly in the software development IDE and in automating
as many tasks as possible. The tool, though still in progress, has now been
used for several college-level courses on software specification and
verification and for small-scale studies on existing Java programs.
