reactor/BlockHound

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Java agent to detect blocking calls from non-blocking threads.

Stars: 1.5k
Forks: 95
Open beginner issues: 0
Indexed issues: 13
Avg merge: 1d 14m
Merged PRs (30d): 6

Dominant language: Java
License: Apache-2.0
Last GitHub push: Sep 14, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: good first issue help wanted

Beginner friendly Everything

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13 open issues indexed

Blockhound not working as expected when Future.get Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

reactor/BlockHound#529 · 5 comments · Opened Sep 29, 2025
Provide non-shaded byte-buddy/asm distribution Open

for/team-attention type/enhancement

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

reactor/BlockHound#436 · 3 comments · 12 reactions · Opened Sep 24, 2024
Detect Synchronized Methods Open

type/enhancement

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

reactor/BlockHound#402 · 1 comment · Opened Mar 12, 2024
Candidates to be included as default allowances Open

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

reactor/BlockHound#353 · 1 reaction · Opened Apr 24, 2023
`java.nio.channels.FileChannel` related operations are not detected as blocking Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

reactor/BlockHound#270 · 4 reactions · Opened Feb 5, 2022
Not detected call to `Files.readString(path)` Open

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

reactor/BlockHound#192 · 2 comments · 1 reaction · Opened Apr 17, 2021
Provide API or document how to allow/disallow blocking inside constructors Open

status/need-design status/on-hold type/documentation type/enhancement

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

reactor/BlockHound#174 · 9 comments · Opened Mar 22, 2021
When Blockhound is used with EmbeddedKafka for unit test, kafka wont terminate Open

for/user-attention

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

reactor/BlockHound#170 · 1 comment · Opened Feb 16, 2021
Future: detect blocking calls in methods that return Futures Open

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

reactor/BlockHound#76 · 6 comments · Opened Dec 25, 2019
Application does not start with BlockHound and ReactorDebugAgent installed on java 8 Open

area/java-agent status/has-workaround status/on-hold type/bug

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

reactor/BlockHound#70 · 14 comments · Opened Nov 3, 2019
IllegalMonitorStateException in ReentrantLock$Sync.tryRelease on executor shutdown Open

good first issue type/enhancement

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

reactor/BlockHound#38 · 6 comments · Opened Jul 5, 2019
OpenJDK 13 requires -XX:+AllowRedefinitionToAddDeleteMethods flag Open

area/java-agent help wanted status/has-workaround

Difficulty 4/5 3-5 days Newbie friendliness 30/100

reactor/BlockHound#33 · 20 comments · 10 reactions · Opened Jun 2, 2019
Not working under OpenJ9 Open

status/need-investigation type/bug

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

reactor/BlockHound#21 · 1 comment · 3 reactions · Opened Apr 8, 2019

reactor/BlockHound

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