sbt, the interactive build tool
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eugene yokota 5ce61b7f76
[2.x] fix: Print server stderr on startup failure (#8816) (#8857)
**Problem**
When the sbt server fails to start (e.g. wrong JDK version), the client
only shows "failed to connect to server" hiding the actual error. The
server stderr is redirected to /dev/null to prevent Linux pipe buffer
deadlocks (#8442), so diagnostic output is lost.

**Solution**
Redirect server stderr to a temp file instead of /dev/null. When the
server fails to start (portfile never appears), read and print the temp
file contents before throwing ServerFailedException. The temp file is
cleaned up eagerly on both success and failure paths.

Fixes #8812

Co-authored-by: Dream <42954461+eureka928@users.noreply.github.com>
2026-03-01 15:50:52 -05:00
.github [2.x] feat: repositories_force support (#8761) 2026-02-20 01:52:59 -05:00
buildfile/src [2.x] Fix lazy val name handling in Eval (#8818) (#8852) 2026-03-01 05:28:43 -05:00
client Revert "[2.x] feat: Enable musl static linking for sbtn on JDK 17+ (#8464)" (#8557) 2026-01-16 00:06:28 -05:00
contributing-docs Scala 3.8.2 (#8805) 2026-02-24 00:29:44 -05:00
core-macros/src [2.x] fix: Reject java.io.File as cached task output type (#8766) 2026-02-21 01:35:46 -05:00
internal [2.x] refactor: Remove redundant conversions (#8786) 2026-02-22 23:44:17 -05:00
launch [2.x] feat: repositories_force support (#8761) 2026-02-20 01:52:59 -05:00
launcher-package [2.x] fix: Runner should fail on JDK < 17 for sbt 2.x (#8825) (#8855) 2026-03-01 05:29:46 -05:00
licenses move remaining pieces of sbt subproject to sbt_pending and fix notices 2010-09-21 21:55:50 -04:00
lm-core [2.x] fix: Fixes evicted warning for version intervals (#8719) 2026-02-09 02:27:28 -05:00
lm-coursier Scala 3.8.2 (#8805) 2026-02-24 00:29:44 -05:00
lm-ivy/src [2.x] refactor: Use foreach instead of map (#8793) 2026-02-22 23:47:12 -05:00
main [2.x] fix: IgnoreSourceChanges now works (#8820) (#8853) 2026-03-01 05:29:06 -05:00
main-actions/src [2.x] fix: Fixes explicitlySpecified and selectors for testOnly (#8727) 2026-02-13 09:19:05 -08:00
main-command/src [2.x] fix: Print server stderr on startup failure (#8816) (#8857) 2026-03-01 15:50:52 -05:00
main-settings/src [2.x] fix: Fixes plugin toggle precedence between disablePlugins and enablePlugins (#8794) 2026-02-23 00:11:57 -05:00
notes Spelling (#8028) 2025-02-04 01:11:28 -05:00
project Scala 3.8.2 (#8805) 2026-02-24 00:29:44 -05:00
protocol/src [2.x] Minimalist console (#8722) 2026-02-09 10:55:44 -05:00
run [2.x] fix: Fixes double quotes handling in fork mode (#8846) 2026-03-01 03:44:30 -05:00
sbt-app/src [2.x] fix: IgnoreSourceChanges now works (#8820) (#8853) 2026-03-01 05:29:06 -05:00
sbt-remote-cache/src/main/scala/sbt remove unnecessary `case` 2025-02-22 08:48:29 +09:00
sbtw [2.x] fix: Runner should fail on JDK < 17 for sbt 2.x (#8825) (#8855) 2026-03-01 05:29:46 -05:00
scripted-sbt Fix warnings. Avoid copyArrayToImmutableIndexedSeq (#8781) 2026-02-22 06:04:21 -05:00
scripts Fix lm-coursier scripted 2024-10-11 14:30:55 +02:00
server-test/src Scala 3.8.2 (#8805) 2026-02-24 00:29:44 -05:00
src [2.x] Add scripted test for #7838 (#8541) 2026-01-20 12:13:27 -05:00
tasks Use enum instead of scala.Enumeration in sbt.Execute.State (#8788) 2026-02-22 22:21:29 -05:00
tasks-standard Use SAM-conversion if possible (#8477) 2026-01-11 07:21:28 -05:00
testing [2.x] fix: Fixes testing EventHandler race condition 2026-02-09 10:55:06 -05:00
util-cache Fix ActionCache: treat invalid/empty JSON as cache miss 2026-02-15 07:50:38 +01:00
util-collection [2.x] refactor: Remove unnecessary asInstanceOf (#8791) 2026-02-22 23:46:21 -05:00
util-tracking [2.x] test: Migrate TrackedSpec.scala to verify.BasicTestSuite (#8547) 2026-01-15 22:51:29 -05:00
worker/src Fix raw types in java file (#8782) 2026-02-22 14:32:52 -05:00
zinc-lm-integration/src [2.x and 1.x] Respect `scalaOrganization` in compiler bridge resolution (#8732) 2026-02-21 01:11:10 -05:00
.git-blame-ignore-revs Add .git-blame-ignore-revs 2024-10-09 13:38:02 +02:00
.gitattributes Fix line endings in msi 2021-11-19 20:41:39 -05:00
.gitignore [2.x] fix : BSP compile returns StatusCode.Error on failure (#8104) (#8709) 2026-02-07 11:01:49 -05:00
.gitmodules Move metadata to lm-coursier/metadata 2024-10-09 09:44:42 +02:00
.java-version Scala 3.8.0 2026-01-24 04:52:28 -05:00
.jvmopts Add .jvmopts 2023-11-25 01:06:30 -05:00
.mailmap Add mailmap 2019-06-11 09:30:14 +02:00
.sbtopts Restore .sbtopts file 2020-11-19 12:42:26 -08:00
.scala-steward.conf Pin slf4j-api 2023-01-02 22:06:46 -05:00
.scalafmt.conf update scalafmt config. re-format build files 2025-09-23 10:28:38 +09:00
AGENTS.md [2.x] docs: Move to CONTRIBUTING (#8629) 2026-01-25 15:48:09 -05:00
CONTRIBUTING.md Update contributing to clarify AI usages (#8657) 2026-01-29 11:56:45 -05:00
LICENSE add LICENSE file 2023-06-25 09:53:06 +09:00
NOTICE Transfer copyright to Scala Center 2023-06-20 16:39:07 +02:00
PROFILING.md docs: Update flamegraph guide --lines 2025-11-09 18:06:13 -05:00
README.md [2.x] docs: Move to CONTRIBUTING (#8629) 2026-01-25 15:48:09 -05:00
SUPPORT.md Transfer copyright to Scala Center 2023-06-20 16:39:07 +02:00
build.sbt [2.x] fix: Runner should fail on JDK < 17 for sbt 2.x (#8825) (#8855) 2026-03-01 05:29:46 -05:00
reset.sh 1.0.3-SNAPSHOT 2017-09-16 15:52:58 -04:00
sbt [2.x] fix: Runner should fail on JDK < 17 for sbt 2.x (#8825) (#8855) 2026-03-01 05:29:46 -05:00
sbt-allsources.sh Merge remote-tracking branch 'lm/wip/sbt-2.x' into 2.x-lm-coursier 2024-10-09 08:50:03 +02:00
sbt.sh Implement sbt-launch.jar download 2021-04-19 23:43:15 -04:00
server.md setting query is "sbt/setting" 2017-10-03 01:45:06 -04:00

README.md

CI Latest version Discord

sbt

sbt is a build tool for Scala, Java, and more.

For general documentation, see https://www.scala-sbt.org/.

sbt 2.x

This is the 2.x series of sbt. The source code of sbt is split across several GitHub repositories, including this one.

  • sbt/io hosts sbt.io module.
  • sbt/zinc hosts Zinc, an incremental compiler for Scala.
  • sbt/sbt, this repository hosts modules that implement the build tool.
  • Setup: Describes getting started with the latest binary release.
  • FAQ: Explains how to get help and more.
  • sbt/sbt-zero-seven: hosts sbt 0.7.7 and earlier versions

Issues and Pull Requests

Please read CONTRIBUTING carefully before opening a GitHub Issue or a pull request.

If you're looking for an idea for a contribution, issues labeled with good first issue or help wanted might be good starting points.

If you would like to ask questions about sbt, there's sbt channel on Scala Discord, but it would be good to gather questions on Stackoverflow.

license

See LICENSE.