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...All current work and new releases are on github: https://github.com/OpenJML/OpenJML.
The Java Modeling Language (JML) is a behavioral interface specification language that can be used to specify the behavior of Java modules (as in design by contract -- DBC). It has many tools to do assertion checking, unit testing, etc.
The principal current tool of the project is OpenJML -- cf. https://www.openjml.org, with binary downloads from https://github.com/OpenJML/OpenJML/releases/latest
Modern Jass is a Design by Contract implementation for Java which uses Java 5 annotations, the Pluggable Annotation Processing API (JSR 269), the Compiler API (JSR 199), and the Bytecode Instrumentation API.
ContractChecker is a small tool to provide support for some design by contract features to standard Java code.
Internally, it is composed of an Ant task, which invokes a doclet to generate AspectJ and the AjcTask itself in order to compile it.