Any ideas on building a JVM JAR file with only the...
# generalw
witty-family-13337
03/02/2022, 4:17 PMAny ideas on building a JVM JAR file with only the compiled classes code but without the 3rd party dependencies? The situation I’m trying to deal here is some dependencies on Akka, since each Akka JAR file has a
reference.confdeploy_jarsbt-assemblye
enough-analyst-54434
03/02/2022, 4:45 PMWe used to have something like that here: https://github.com/pantsbuild/pants/blob/674df55a3dda870e78997965e617993b9d10d2eb/src/python/pants/backend/jvm/targets/jvm_binary.py#L55-L90
f
fast-nail-55400
03/02/2022, 5:19 PMalso WAR file support was merged earlier in the week (
jvm_warfast-nail-55400
03/02/2022, 5:19 PM(will be available in 2.11)
w
witty-family-13337
03/02/2022, 9:12 PMboth options sound like a possible way forward. I guess the one from John is from v1
witty-family-13337
03/02/2022, 9:13 PMthe WAR gets close, but it's a runnable JAR what I’m thinking of. More like just contents of the WEB-INF/classes folder from the WAR
witty-family-13337
03/02/2022, 9:14 PMbut I guess that we could use auxiliary scripts to unpack the WAR and grab what we need from it.
f
fast-nail-55400
03/02/2022, 9:15 PMwe already produce a thin jar for first-party classfiles that is included in the WAR
fast-nail-55400
03/02/2022, 9:16 PMnot much work from there to have that available as a target type
fast-nail-55400
03/02/2022, 9:16 PMmainly just a user-visible way to access what the Pants Java backend is already doing
fast-nail-55400
03/02/2022, 9:17 PMthe WAR gets close, but it’s a runnable JAR what I’m thinking of. More like just contents of the WEB-INF/classes folder from the WARdo you still want third-party jars unpacked in this runnable jar?
fast-nail-55400
03/02/2022, 9:18 PMor just the thin jar with first-party classfiles?
w
witty-family-13337
03/02/2022, 9:23 PMso, it’s either a fat jar with some options for rules to merge files when collisions show ups (due to the Akka jars all having a
reference.confwitty-family-13337
03/02/2022, 9:24 PMin the case of the latter we still will need to collect the thin jars transitive deps, but that is sort of easy to get
witty-family-13337
03/02/2022, 9:24 PMand well, a WAR is somehow both things
witty-family-13337
03/02/2022, 9:25 PMwe just would need to mangle it into our own layou
f
fast-nail-55400
03/02/2022, 9:33 PMso, it’s either a fat jar with some options for rules to merge files when collisions show ups (due to the Akka jars all having awe would need to port the merging code from Pants v1 into v2file. Or a thin runnable jar with only 1st class compiled classes.reference.conf
fast-nail-55400
03/02/2022, 9:33 PMnot sure how much work that would be, but worth an issue to evaluate
fast-nail-55400
03/02/2022, 9:35 PMalso as an FYI on the WAR emitted by Pants,
WEB-INF/classesWEB-INF/libw
witty-family-13337
03/03/2022, 7:55 AMah ok, guess that particularity with the WAR files is not a big deal, as that still gives a valid classpath
f
fast-nail-55400
03/03/2022, 1:20 PMyup that was my thought when I implemented it that way. saved me from having to write code to figure out which
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