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    <p>If you already have a large amount of business logic implemented in Java, then I see two possibilities for you.</p> <p>The first is to use a high level language that runs within the JVM and has a web framework, such as <a href="http://groovy.codehaus.org/" rel="nofollow noreferrer">Groovy</a>/<a href="http://grails.org/" rel="nofollow noreferrer">Grails</a> or <a href="http://jruby.codehaus.org/" rel="nofollow noreferrer">JRuby</a> and <a href="http://rads.stackoverflow.com/amzn/click/1590598814" rel="nofollow noreferrer">Rails</a>. This allows you to directly leverage all of the business logic you've implemented in Java without having to re-architect the entire site. You should be able to take advantage of the framework's improved productivity with respect to the web development and still leverage your existing business logic.</p> <p>An alternative approach is to turn your business logic layer into a set of services available over a standard RPC mechanisim - REST, SOAP, XML-RPC or some other simple XML (YAML or JSON) over HTTP protocol (see also <a href="https://dwr.dev.java.net/" rel="nofollow noreferrer">DWR</a>) so that the front end can make these RPC calls to your business logic.</p> <p>The first approach, using a high level language on the JVM is probably less re-architecture than the second. </p> <p>If your goal is a complete migration off of Java, then either of these approaches allow you to do so in smaller steps - you may find that this kind of hybrid is better than whole sale deprecation - the JVM has a lot of libraries and integrates well into a lot of other systems.</p>
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    1. POHow can I port a legacy Java/J2EE website to a modern scripting language (PHP,Python/Django, etc)?
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    1. USKyle Burton
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    1. COHey, don't forget Jython (Python running under the Java Virtual Machine)! You can run the Django framework under Jython, and probably others too that I don't know about.
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      1. USDan Lenski
 

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