dynamic creation of class at runtime from file

Question

I'm looking for a possibility to load the Java code dynamically into a class at the run time. The Java Code should be readed from an XML-file. There are just some "If-Then" expressions and should be added into one class and use it like any other class in my project.

Actually my file contains some rule codes which i want to load like cache and use this class further

Does someone know if it is possible in java?

best regards
Abhij

Good god(s) consider using a Groovy, JRuby, etc DSL instead: way less work, and much easier to deal with. — Dave Newton
– Dave Newton, Commented May 11, 2012 at 13:06
Actually it contain some ruleCode of organization like C01|((customer=registered) and (sales>70000)) then it is of type C01 — Abhij
– Abhij, Commented May 11, 2012 at 13:26

Garrett Hall · Accepted Answer · 2012-05-11 13:03:08Z

2

I believe you can do this with CGLib, but I haven't done more than use it to mock classes at runtime. If dynamic code is a major aspect of your application you should consider using a language like Ruby which has much better support for running code read in at runtime.

answered May 11, 2012 at 13:03

Garrett Hall

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2 Comments

Konstantin V. Salikhov Over a year ago

As a script language you can use beanshell.org - it's syntax is very Java-like

Dave Newton Over a year ago

You could also use javassist, or just leverage the existing java compilation api... But I agree using a dynamic language is a better solution.

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