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XJML 1.0 is a platform for Verification and Validation of Java classes
XJML 1.0 actually can reads one Java class and its contract (written in XML) and then executes the next verification techniques:
1. Runtime Assertion Checking (RAC). Using JML4c and JML4rt tools.
2. Extended Static Checking (ESC). Using ESC/Java2.
3. Full Static Program Verification (FSPV). Using the Why platform (tested with Why 2.30 and Why3 0.71)
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.