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get rid of groovy recompilation

Compilation time for a groovy script adds a relatively high overhead to the running time of an application that is supposed to run very often. Granted, the GroovyScriptEngine does on-demand recompilation, but the compilation units don’t survive a restart.

I’m working on a project that contains a little command line application that is supposed to run very often. Every overhead adds up costs very quickly. I’ve measured more than a second overhead to compile two very small groovy scripts.

In this entry, we will create a mechanism that stores compiled groovy classes in a temporary directory and reuses them if none of the scripts have any changes.

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How to scan for annotated classes and instantiate them

You may have been faced with the following problem: Let’s say you have a system that provides a couple of neat features out of the box, but you want to provide some means for the end user to extend the system, without having to release a new version that incorporates what your users have added (maybe because those additions are too exotic, or you just don’t like it).

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using groovy 'scriptlets' in java

My goal is to ‘outsource’ parts of a java application into groovy scriptlets, and have the main program (written in java) load those scriptlets and execute them in a predefined fashion.

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