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Fully Managed MySQL, PostgreSQL, and SQL Server
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N.B. THE PROJECT HAS BEEN MOVED TO GITHUB
https://github.com/jiprolog/
JIProlog is a cross-platform pure Java 100% Prolog interpreter that integrates Prolog and Java languages in a very fashinating way.
JIProlog is compliant with the major Prolog interpreters. It supports most of ISO Prolog specifications and the most common and used built-in predicates,
JIProlog allows to call Prolog predicates from Java without dealing with native code (JNI or JNA) and allows to invoke Java methods from Prolog in the same way you call predicates.