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Java webstart missing cache

How to avoid Java files not related to jar cache?

In development, I want to avoid caching in java webstart. In my lanuch.jnlp, if every time I change the jar version number, will it force me to load a new jar, and not use its cache?

Thank.

<jar href="myjar1.jar" main="true" version="031720111507"/>
<jar href="myjar2.jar"  version="031720111507"/>
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Java Webstart will send a HEAD HTTP request to the server to get the timestamp of all the required .jar files. That is, you don’t even need to update Java Webstart version numbers to understand that the cache is out of date.

Quote from here :

( ) Web Start HTTP HEAD XML, , , , -. , HTTP HEAD .

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