scalacenter/bloop

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Bloop is a build server and CLI tool to compile, test and run Scala fast from any editor or build tool.

Stars: 943
Forks: 214
Open beginner issues: 0
Indexed issues: 46
Avg merge: 1d 20h
Merged PRs (30d): 19

Dominant language: Scala
License: Apache-2.0
Last GitHub push: Sep 18, 2026
Latest indexed: Sep 19, 2026
Contributing guide: No contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted good first issue

Beginner friendly Everything

Open All

46 open issues indexed

Warnings from previous compiles are silently dropped by the default CLI reporter Open

Difficulty 3/5 1-2 days Newbie friendliness 72/100

scalacenter/bloop#3061 · Opened Sep 9, 2026
Bloop returns wrong errors Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

scalacenter/bloop#3034 · 4 comments · Opened Jul 30, 2026
CommandsDocGenerator produces broken output since the case-app 2.x migration, and CI can't notice Open

docs priority / low

Difficulty 4/5 3-5 days Newbie friendliness 68/100

scalacenter/bloop#3024 · 1 comment · Opened Jul 23, 2026
Bloop CLI fails (again/still?) with Uninitialized TermDisplay Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

scalacenter/bloop#2905 · 2 comments · Opened Mar 30, 2026
Feature Request: Use .config/bloop/ for project level settings Open

configuration format help wanted priority / low

Difficulty 5/5 Over a week Newbie friendliness 35/100

scalacenter/bloop#2698 · 14 reactions · Opened Jul 10, 2025
Keep a trace of compiled files Open

enhancement ergonomics

scalacenter/bloop#2697 · 2 comments · 1 assignee · Opened Jul 8, 2025
Bloop uses all of my CPU and won't stop until I send it SIGKILL Open

needs more info needs reproduction

Difficulty 5/5 Over a week Newbie friendliness 25/100

scalacenter/bloop#2659 · 5 comments · Opened Apr 28, 2025
UX: bloop help is not exteremely friendly Open

cli difficulty / easy help wanted priority / low

Difficulty 3/5 1-2 days Newbie friendliness 35/100

scalacenter/bloop#2650 · 2 comments · 1 reaction · Opened Apr 4, 2025
Support dependency sources from a directory, not a JAR Open

help wanted priority / low

Difficulty 4/5 3-5 days Newbie friendliness 35/100

scalacenter/bloop#2649 · 5 comments · Opened Mar 31, 2025
[BUG] Linking JS through bsp does not produce output. Open

bug help wanted Scala.js

Difficulty 3/5 1-2 days Newbie friendliness 35/100

scalacenter/bloop#2596 · 1 comment · 1 reaction · Opened Feb 4, 2025
Bloop server sometimes becomes unresponsive Open

bug build server needs more info

Difficulty 4/5 3-5 days Newbie friendliness 25/100

scalacenter/bloop#2594 · 20 comments · 1 reaction · Opened Jan 31, 2025
Need to add support for file mapping of resources Open

difficulty / easy feature priority / low

Difficulty 5/5 Over a week Newbie friendliness 35/100

scalacenter/bloop#2592 · 1 comment · Opened Jan 28, 2025
Favor NIO over IO to avoid FileSystemExceptions on Windows Open

difficulty / easy good first issue help wanted

Difficulty 3/5 1-2 days Newbie friendliness 42/100

scalacenter/bloop#2566 · 1 comment · Opened Jan 10, 2025
Error while fetching testClass in Scala JS project Open

build server needs more info

Difficulty 4/5 3-5 days Newbie friendliness 25/100

scalacenter/bloop#2562 · 2 comments · Opened Jan 9, 2025
not found: type Simulationbloop Open

bug integrations maven

Difficulty 3/5 1-2 days Newbie friendliness 35/100

scalacenter/bloop#2519 · 1 comment · Opened Nov 28, 2024
`asTerm called on not-a-Term val <none>` thrown when compiling Dotty via Bloop Open

bug compilation Scala 3

Difficulty 4/5 3-5 days Newbie friendliness 35/100

scalacenter/bloop#2517 · 3 comments · Opened Nov 26, 2024
Avoid hardcoded `-XX:+UseZGC` on BSD system? Open

bug help wanted

Difficulty 3/5 1-2 days Newbie friendliness 45/100

scalacenter/bloop#2515 · 1 comment · Opened Nov 25, 2024
Test errors are actually printed to error log via bsp Open

bug build server

Difficulty 4/5 3-5 days Newbie friendliness 25/100

scalacenter/bloop#2449 · Opened Sep 20, 2024
disable noise when printing test results Open

cli enhancement

Difficulty 3/5 1-2 days Newbie friendliness 35/100

scalacenter/bloop#2414 · 4 comments · Opened Aug 29, 2024
`bloop run` not killing processes when exited Open

bug needs reproduction

Difficulty 4/5 3-5 days Newbie friendliness 35/100

scalacenter/bloop#2398 · Opened Aug 13, 2024
Scrollback cleared when in `--watch` mode Open

difficulty / easy enhancement

Difficulty 3/5 1-2 days Newbie friendliness 35/100

scalacenter/bloop#2348 · Opened Jun 5, 2024
multiple errors like "bad path element "... ": no such file or directory when building Apache Kafka Open

bug gradle java

Difficulty 4/5 3-5 days Newbie friendliness 25/100

scalacenter/bloop#2303 · 4 comments · Opened Mar 25, 2024
Issues with semanticdb if workspace contains whitespace Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 35/100

scalacenter/bloop#2248 · Opened Jan 14, 2024
bug: deduplicate for cancelled compilations Open

bug difficulty / hard

Difficulty 4/5 3-5 days Newbie friendliness 42/100

scalacenter/bloop#2170 · Opened Oct 3, 2023
Java modules are not handled properly Open

bug java

Difficulty 5/5 Over a week Newbie friendliness 20/100

scalacenter/bloop#2080 · 2 comments · Opened Jun 20, 2023
`bloop exit` is undocumented in CLI help and completions Open

help wanted priority / low

Difficulty 2/5 1-3 hours Newbie friendliness 75/100

scalacenter/bloop#2076 · 2 comments · Opened Jun 13, 2023
Migrate away from monix to cats-effect Open

difficulty / hard enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

scalacenter/bloop#2066 · 7 comments · 4 reactions · Opened Jun 5, 2023
FailedToStartServerException: Server didn't start possibly due to SocketException: Unix domain path too long Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 25/100

scalacenter/bloop#2039 · 2 comments · Opened Apr 17, 2023
Allow to cancel run and test Open

difficulty / easy task / run task / test

Difficulty 4/5 3-5 days Newbie friendliness 25/100

scalacenter/bloop#2030 · 2 comments · Opened Apr 6, 2023
Make infinite compilation cancellable Open

bug difficulty / hard

Difficulty 4/5 3-5 days Newbie friendliness 35/100

scalacenter/bloop#2019 · Opened Mar 14, 2023
[Question] Does bloop support annotation processing for a pure Gradle Java project? Open

bug java

Difficulty 4/5 3-5 days Newbie friendliness 35/100

scalacenter/bloop#2007 · 3 comments · Opened Feb 21, 2023
Can't compile Spark 3.3 Open

bug maven

Difficulty 4/5 3-5 days Newbie friendliness 25/100

scalacenter/bloop#1983 · 1 comment · Opened Jan 13, 2023
unreasonable about of disk writes Open

discussion

Difficulty 4/5 3-5 days Newbie friendliness 25/100

scalacenter/bloop#1964 · 2 comments · Opened Dec 23, 2022
Tracking flaky tests Open

ci enhancement

Difficulty 4/5 3-5 days Newbie friendliness 25/100

scalacenter/bloop#1953 · 1 comment · Opened Dec 15, 2022
Cannot compile Scala 3 export zio.test.Gen.* Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

scalacenter/bloop#1883 · 3 comments · Opened Nov 28, 2022
Extend `TestResult#data` with structured summary of tests Open

enhancement task / debug

Difficulty 5/5 Over a week Newbie friendliness 30/100

scalacenter/bloop#1771 · 1 comment · Opened Aug 1, 2022
Bloop is no able to detect custom source sets Open

bug sbt

Difficulty 3/5 1-2 days Newbie friendliness 48/100

scalacenter/bloop#1765 · 9 comments · Opened Jul 24, 2022
`ClasspathHasher` doesn't handle cancelation correctly Open

bug compilation

Difficulty 4/5 3-5 days Newbie friendliness 52/100

scalacenter/bloop#1724 · 1 comment · Opened Apr 15, 2022
Fix and restore benchmark step in CI Open

benchmarks

Difficulty 4/5 3-5 days Newbie friendliness 35/100

scalacenter/bloop#1693 · Opened Feb 23, 2022
Add back build pipelining Open

difficulty / hard

Difficulty 4/5 3-5 days Newbie friendliness 35/100

scalacenter/bloop#1689 · Opened Feb 21, 2022
Use multiple bloop servers on one machine Open

difficulty / hard ergonomics

Difficulty 5/5 Over a week Newbie friendliness 25/100

scalacenter/bloop#1635 · 1 comment · 3 reactions · Opened Dec 29, 2021
Rethink sbt offloading compilation to Bloop Open

feature sbt

Difficulty 5/5 Over a week Newbie friendliness 25/100

scalacenter/bloop#1626 · 1 comment · 7 reactions · Opened Dec 14, 2021
Caching artifacts in bloop Open

difficulty / hard feature priority / low

Difficulty 5/5 Over a week Newbie friendliness 25/100

scalacenter/bloop#1351 · 3 comments · Opened Jul 31, 2020
Document how to start Bloop server from behind a proxy Open

docs help wanted install

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

scalacenter/bloop#1293 · 1 comment · 1 reaction · Opened May 27, 2020
Unexpected large program outputs freaks out the server Open

bug task / run

Difficulty 4/5 3-5 days Newbie friendliness 35/100

scalacenter/bloop#1259 · 4 comments · Opened Apr 21, 2020
Test runner that sets System.err causes Bloop server to become unresponsive Open

bug cli enhancement task / test

scalacenter/bloop#1155 · 8 comments · 1 assignee · Opened Jan 24, 2020

scalacenter/bloop

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