You're going to spend alot of time marshalling between Java and Haskell values, and you'll either have to do it via JNI or by using pipes [as in System.exec("haskellprogram param param param")], both of which are ugly for a Java app. Have you looked at Jython and JRuby? Jython is an implementation of a Python interpreter in 100% Java, and JRuby implements a Ruby interpreter in 100% Java. Those might get the job done faster than having to delve into the native layer. (Not to mention learning how to use Haskell in order to implement what you want--not a trivial task in itself!) Take care, --doug On Oct 5, 2004, at 4:33 PM, Bhinderwala, Shoeb wrote: Hi All, I am new to Haskell and this mailing list. We have a system that uses a custom high-level language to express high-level business rules. Expressions in the high-level language get compiled to Java bytecode. We express the grammar using BNF notation as required by the javacc parser tool. This is then converted to an AST using jjtree and from there we build the final Java code. Our language could be considered a domain-specific language (DSL) and is used by our business users to express very high-level business logic. The language currently is very limited - we support boolean logic, function invocations and if-then statements. We want to convert it into a more powerful scripting language so that even lower level business logic can be expressed in it. I came across a few papers that talk about writing a DSL with Haskell as the underlying support language. How is this done. Is it possible to create a sort of domain specific business scripting language easily. How does that then compile to Haskell code. And how can the Haskell code be invoked from Java. Essentially, I am thinking if I could use a Haskell like DSL language to express our business rule logic and then be able to integrate into and invoke the logic from a J2EE app server environment. Has anybody done anything like this with Haskell. -- Shoeb _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe This communication is confidential and may be legally privileged. If you are not the intended recipient, (i) please do not read or disclose to others, (ii) please notify the sender by reply mail, and (iii) please delete this communication from your system. Failure to follow this process may be unlawful. Thank you for your cooperation.