Technique or utility to minimize Java “warm-up” time?

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“Warm-up” in Java is generally about two things:

(1): Lazy class loading: This can be work around by force it to load.

The easy way to do that is to send a fake message. You should be sure that the fake message will trigger all access to classes. For exmaple, if you send an empty message but your progrom will check if the message is empty and avoid doing certain things, then this will not work.

Another way to do it is to force class initialization by accessing that class when you program starts.

(2): The realtime optimization: At run time, Java VM will optimize some part of the code. This is the major reason why there is a warm-up time at all.

To ease this, you can sent bunch of fake (but look real) messages so that the optimization can finish before your user use it.

Another that you can help to ease this is to support inline such as using private and final as much as you can. the reason is that, the VM does not need to look up the inheritance table to see what method to actually be called.

Hope this helps.

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