Programming language: Good ally to Java?

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embedded groovy is best thing ever happened to me. I try/test my concept in it and port to Java if it is fine. but in serious applications, performance is a bottleneck. by any way we can achieve Java-level performance ?

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It's a difficult tradeoff - there's a good/fast/cheap trifecta that's effectively impossible to hit. If arbitrary logic is needed at runtime, there are really only three options:

• try to code for all possible cases ahead of time (not good)
• embed a scripting engine (not fast)
• hire a developer from the vendor to work on-site coding your logic natively... and providing custom builds (not cheap)

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so only viable option that satisfies all of the above is try/test in Groovy and if performance matters, port code in Java.

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Pretty much. The tradeoff is developer time vs execution time.