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...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
C4J is a simple, powerful and non-intrusive tool that makes it easy to add contract verification of instances and methods of any Java class or interface, with full inheritance support. C4J brings Design By Contract to Java.
The Harmoni PHP Project consists of three major components: 1) A PHP application framework and architecture, offering, e.g. authentication, DBC, file storage 2) PHP OKI OSID (service definitions) conversion system 3) PHP implementations of those OSIDs
Java Fine Print is a Design by Contract (DbC) tool. Developers add @Invar, @Pre, and @Post annotations to their code. Java Fine Print uses these annotations to generate Java source code that tests for contract violations.
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The DBC framework uses reflection to inspect a type, it then generates source for a proxy object containing checks on predicates in attributes attached to members of the type. Proxy code is compiled into an in-mem assembly used to enforce DBC rules.