Thank you very much for your remarks and pointers, Mark! ---rony
P.S.: Not sure as of yet, what scope it should be. The idea would be to allow any of the Java script languages to be used. Currently the naive assumption is that one could redirect the script's stdout to the servlet's 'out' object (by using ScriptContext.setWriter(out)) and using ScriptEngineFactory helper methods getOutputStatement(...), getProgram(...) and maybe getMethodCallSyntax(...) for creating the appropriate script program from the JSP that then gets dispatched via ScriptEngine.eval(...) from the created Java program. On 17.10.2019 15:41, Mark Thomas wrote: > On 17/10/2019 11:00, Rony G. Flatscher (Apache) wrote: >> Being interested in analyzing what is needed to enable Tomcat JSP's to >> be deployable with any Java scripting languages (i.e. with >> javax.script.ScriptEngines) instead of Java. > A potentially huge amount of work if you propose replicating JSP > functionality (tag libraries, EL support, etc.) but with a different > language. > >> Motivation: there are programmers who are not able to program in Java, >> but have broad expertise in programming with other languages like >> Javascript, PHP, Rexx, Python, etc. If such programmers could devise >> JSPs using their programming language of choice instead of (or in >> addition to) Java, they would become able to take advantage of Tomcat. >> >> Idea: since Java 6 the javax.script package defines a Java scripting >> framework which can be used to generically create the Java program >> necessary to deploy the code in JSPs. E.g. the 'request' and 'response' >> objects could be supplied as arguments via the >> ScriptContext.ENGINGE_SCOPE Bindings in a Java array named >> ScriptEngine.ARGV, but also objects like 'out' could be made available >> to all Java scripting languages. This in essence should allow any (JVM) >> langugage implementing a javax.script.ScriptEngine to be used as a >> programming language in a JSP by merely denoting its name in "<%@ page >> language="LANGUAGE" contentType="text/html"%>, where LANGUAGE could then >> be e.g. "javascript", "jython", "netrexx", "rexx", ... instead of "java". >> >> The question(s): >> >> * Where would one find a document/tutorial with a conceptual overview >> of processing a JSP file? > The JSP specification. > https://cwiki.apache.org/confluence/display/tomcat/Specifications > >> * Which class(es) are used to process JSPs with the language attribute >> set to "java" in the current implementation of Tomcat, assuming that >> it would be feasible to subclass (or create alternatives of) those >> class(es) to add generic support for JSR223 (javax.script.ScriptEngine)? > org.apache.jasper.* > > Mark --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@tomcat.apache.org For additional commands, e-mail: dev-h...@tomcat.apache.org
