Java on demand build system

Question

I have a vague memory that I've seen a build system for Java or some other JVM lang which you could run in continous mode (so to speak). This would make the build system run in the background, watching the source dir for changes. As soon as a source file changes, the build system kicks in and re-runs relevant parts of the build process to produce a fresh artifact.

Ring any bells?

Thanks

http://stackoverflow.com/questions/tagged/continuous-integration+java?sort=votes&pagesize=50 for example: http://stackoverflow.com/questions/4806331/bamboo-vs-hudsona-k-a-jenkins-vs-any-other-ci-systems — assylias, Aug 08 '12 at 11:11
it doesn't sound like this is what he wants - Continuous integration servers generally monitor source control repositories - this sounds more like performing local builds — plasma147, Aug 08 '12 at 11:22

score 2 · Answer 1 · answered Aug 08 '12 at 11:18

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Is it the gradle daemon?

This keeps gradle running in the background because it has long start up times - and scans the file system to identify when files change.

answered Aug 08 '12 at 11:18

plasma147

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score 1 · Accepted Answer · edited May 23 '17 at 12:12

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There are lots of engines that support continual checkouts/building/testing (e.g. Jenkins nee Hudson, CruiseControl, TeamCity etc.).

If you're looking at JVM languages other than Java, then (for example) the Maven Scala plugin supports continuous building and testing upon file changes. e.g.

$ mvn scala:cctest

will run the compile/test cycle in a loop watching for source changes and acting upon them.

If your build tool or language doesn't support this natively, it's trivial to write a shell script to watch a directory structure and execute another script/tool upon change. See this SO question for solutions.

edited May 23 '17 at 12:12

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answered Aug 08 '12 at 11:24

Brian Agnew

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yup, that's it! thanks. Now I wonder if there is anything similar for plain old java sources... – Alexander Torstling Aug 08 '12 at 13:57
The gradle daemon would apply to java code if you were building your java code using gradle. – plasma147 Aug 12 '12 at 20:02

score 0 · Answer 3 · edited May 23 '17 at 12:20

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I figured out that it was in fact sbt that I meant. There is another question here on SO relating to how to build Java projects: Use SBT to Build Pure Java Project. Thanks everyone for your help.

edited May 23 '17 at 12:20

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answered Aug 08 '12 at 18:50

Alexander Torstling

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Java on demand build system

3 Answers3