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Slimming down jars since 2016

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Statistics on SlimFast

Number of watchers on Github 199
Number of open issues 2
Main language Java
Average time to merge a PR less than a minute
Open pull requests 0+
Closed pull requests 1+
Last commit almost 2 years ago
Repo Created over 3 years ago
Repo Last Updated over 1 year ago
Size 122 KB
Organization / Authorhubspot
Latest Releaseslimfast-parent-0.18
Page Updated
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SlimFast (unrelated to the delicious beverage)


SlimFast is a tool for Java apps to help them stop building fat jars for deployment (massive jars containing all of the app's dependencies). Building fat jars is slow and adds a lot of complexity (subtle or not so subtle bugs can occur when jars being merged have duplicate files for example).

The first part is the maven plugin, which can be used in place of the maven-assembly-plugin or maven-shade-plugin (which are often used to build fat jars). The other part is a helper library for hadoop to write each job's dependencies to hdfs and add them to the job's classpath.


See here for usage instructions for the maven plugin or here for the hadoop library.

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  • almost 3 years Gradle Plugin :D
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