Curated issues

Java Good First Issues

Browse open source issues tagged with Java in the issue metadata. Results stay focused on work that can become public contribution evidence.

Java

What this list is like

Average annotated difficulty: 3.8/5 across 366,123 issues.
8% of 366,123 time estimates are one day or less.

About Java

A statically typed, JVM-based language from Sun (1995), long the default for large server-side systems and Android apps.

Beginner friendly Everything

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Gate OkHttp body capture on active Session Replay Open

Bug Java Platform: Java

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

getsentry/sentry-java#6138 · 1 comment · Opened Sep 21, 2026
[Datastream to BigQuery] NullPointerException in DataStreamIO when eventType is null Open

bug needs triage p2

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

GoogleCloudPlatform/DataflowTemplates#4273 · 1 comment · Opened Sep 21, 2026
[Studio][Bug] Bulk-deleting a full page of alert rules steps the page back while more rules remain Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

apache/rocketmq-dashboard#4654 · 1 comment · Opened Sep 21, 2026
[Bug] Alert rules pagination total does not render the rule count Open

Difficulty 1/5 Under an hour Newbie friendliness 78/100

apache/rocketmq-dashboard#4642 · 1 comment · Opened Sep 20, 2026
[Bug] rmqctl Studio client buffers response bodies without a size cap Open

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

apache/rocketmq-dashboard#4640 · 1 comment · Opened Sep 20, 2026
[Bug] [Connector-V2] [Http] A streaming Http source never completes a checkpoint: poll_interval_millis is waited out holding the checkpoint lock Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

apache/seatunnel#12411 · Opened Sep 20, 2026
wafv2: TagResource/UntagResource don't enforce the 50-tag limit or key/value length limits Open

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

floci-io/floci#4035 · Opened Sep 20, 2026
wafv2: WAFNonexistentItemException returns 404 instead of the documented 400 Open

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

floci-io/floci#4034 · Opened Sep 20, 2026
wafv2: TagResource/UntagResource have no test coverage for RegexPatternSet or RuleGroup Open

Difficulty 2/5 1-3 hours Newbie friendliness 85/100

floci-io/floci#4033 · Opened Sep 20, 2026
[Bug]: 26.3 Missing directional_particles in ConsumeEffect Open

bug needs triage

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

Minestom/Minestom#3375 · Opened Sep 20, 2026
The `grepIn` javadoc example never matches real XMIR, so a user who copies it silently gets no optimization Open

Difficulty 1/5 Under an hour Newbie friendliness 94/100

objectionary/hone-maven-plugin#1061 · Opened Sep 20, 2026
`Assembler` still logs a cache-skipped file as freshly assembled, the same defect #1669 fixed in `Disassembler` Open

bug

Difficulty 1/5 Under an hour Newbie friendliness 92/100

objectionary/jeo-maven-plugin#1760 · Opened Sep 20, 2026
`XmlField.find` reads attributes by position and always wraps in `Optional.of`, so a missing `access` child shifts every later attribute Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

objectionary/jeo-maven-plugin#1758 · Opened Sep 20, 2026
`DirectivesMethodModifiers` omits `deprecated`, while `DirectivesClassModifiers` has it, so a deprecated method's modifiers node hides the flag Open

bug

Difficulty 1/5 Under an hour Newbie friendliness 90/100

objectionary/jeo-maven-plugin#1757 · Opened Sep 20, 2026
`Docker.available()` waits on the one-hour build timeout, so a wedged daemon blocks the build for an hour on a boolean probe Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

objectionary/hone-maven-plugin#1060 · Opened Sep 20, 2026
`Format` defaults `mode` to `short`, so a library caller loses `SourceFile` and line numbers, while `DisassembleMojo` documents `debug` as the default Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

objectionary/jeo-maven-plugin#1756 · Opened Sep 20, 2026
[Bug] rmqctl fails every command with context deadline exceeded when --timeout is 0s or negative Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

apache/rocketmq-dashboard#4628 · 1 comment · Opened Sep 20, 2026
[Bug] rmqctl install.sh cannot install the published release artifacts Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

apache/rocketmq-dashboard#4626 · 1 comment · Opened Sep 20, 2026
[Bug] rmqctl interactive confirmation flow always fails with CONFIRMATION_TOKEN_REQUIRED Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

apache/rocketmq-dashboard#4624 · 1 comment · Opened Sep 20, 2026
Flaky test: TestLucene104ScalarQuantizedVectorsFormat.testDataBlindNoRawFloatVectors fails when segments > 1 Open

type:bug

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

apache/lucene#16692 · Opened Sep 20, 2026
Store the original domain event in the Namastack outbox Open

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

spring-projects/spring-modulith#1895 · Opened Sep 20, 2026
BIND_ABOVE_CLIENT clamps the client's oom_adj to CACHED_APP_MIN_ADJ, so client apps get frozen in the background (Android 15) Open

0. Needs triage bug

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

nextcloud/Android-SingleSignOn#1081 · Opened Sep 20, 2026
JSONPointer pre-existing bug in toURIFragment() Open

Fix before the next release

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

stleary/JSON-java#1082 · Opened Sep 20, 2026
New JSONPointer tests needed Open

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

stleary/JSON-java#1081 · Opened Sep 20, 2026
Csv does not escape a configured null marker when quotedNulls is enabled Open

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

h2database/h2database#4407 · Opened Sep 20, 2026
[BUG] test(redshift): a partially created shared cluster is never cleaned up Open

bug redshift

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

floci-io/floci#4002 · Opened Sep 20, 2026
[BUG] test(apigateway): the authorizer cleanup can return with deletes still in flight Open

apigateway apigatewayv2 bug

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

floci-io/floci#3999 · 1 comment · Opened Sep 20, 2026
[BUG] docs(cognito): the AuthFlow list advertises ADMIN_USER_SRP_AUTH, which does not exist in AWS Open

cognito documentation

Difficulty 1/5 Under an hour Newbie friendliness 92/100

floci-io/floci#3996 · Opened Sep 20, 2026
[BUG] ci: the first prefetch-images.sh call runs before shard.txt exists, so it is always a no-op Open

bug github-actions

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

floci-io/floci#3995 · Opened Sep 20, 2026
Docs: Broken link to catalog properties page in terms.md Open

Difficulty 1/5 Under an hour Newbie friendliness 92/100

apache/iceberg#18189 · Opened Sep 20, 2026
[Bug] Clients page keeps the text search and type filter after switching NameServers Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

apache/rocketmq-dashboard#4596 · 1 comment · Opened Sep 20, 2026
LanguageServerWrapper.stop() runs its blocking shutdown under a ReadAction via ForkJoinPool.helpAsyncBlocker (follow-up to #1442) Open

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

redhat-developer/lsp4ij#1672 · 1 comment · Opened Sep 20, 2026
[Bug report] Web V2 OAuth token refresh fails with default provider Open

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

apache/gravitino#13356 · 1 comment · Opened Sep 20, 2026
[BUG] cache.type=redis 时图片预览必然 500（Redisson: map key can't be null） Open

Difficulty 1/5 1-3 hours Newbie friendliness 90/100

kekingcn/kkFileView#793 · 1 comment · Opened Sep 20, 2026
Add Railhook Open

addition

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

awesome-selfhosted/awesome-selfhosted-data#3115 · Opened Sep 20, 2026
Invalid Java interface declaration in SmallRye GraphQL guide Open

area/graphql area/smallrye

Difficulty 1/5 Under an hour Newbie friendliness 95/100

quarkusio/quarkus#56884 · 1 comment · Opened Sep 20, 2026
[Studio][Bug] Broker topology page resets the selected instance when the display language changes Open

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

apache/rocketmq-dashboard#4589 · 1 comment · Opened Sep 20, 2026
[Studio][Bug] Topic comparison drawer renders a superseded comparison under the new instance pair Open

Difficulty 2/5 1-3 hours Newbie friendliness 86/100

apache/rocketmq-dashboard#4585 · 1 comment · Opened Sep 20, 2026
[Request]: mirthsync Open

package-request

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

ScoopInstaller/Extras#18783 · Opened Sep 20, 2026
INCLUDE RAGE4J - Test your LLM apps like the rest of your Java code Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

jamesward/ai4jvm#123 · Opened Sep 20, 2026
Include DOKIMOS - The LLM evaluation framework for Java and Kotlin. Open

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

jamesward/ai4jvm#122 · Opened Sep 20, 2026
Include SMILE Java Open

Difficulty 1/5 Under an hour Newbie friendliness 72/100

jamesward/ai4jvm#121 · Opened Sep 20, 2026
SecureFileStore.readFully() may skip decryption when off > 0 and the destination prefix is zeroed Open

Difficulty 2/5 1-3 hours Newbie friendliness 86/100

h2database/h2database#4405 · Opened Sep 20, 2026
Kobo sync download returns HTTP 500 for `.kepub.epub` files when KePub conversion is enabled Open

needs-triage

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

grimmory-tools/grimmory#2710 · 2 comments · Opened Sep 19, 2026
[BUG] Lambda: Kinesis event source poller reads the wrong account Open

bug kinesis lambda

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

floci-io/floci#3955 · Opened Sep 19, 2026
[BUG] A virtual-hosted object key is truncated when it contains the bucket name as a segment Open

bug s3

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

floci-io/floci#3943 · Opened Sep 19, 2026
MisformattedTestData suggested fix wraps long `// BUG: Diagnostic contains: ` lines Open

Difficulty 2/5 1-3 hours Newbie friendliness 65/100

google/error-prone#6130 · Opened Sep 19, 2026
Update documentation of HeFQUIN service Open

documentation

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

LiUSemWeb/HeFQUIN#722 · Opened Sep 19, 2026
The Unix sbt script ignores JAVA_HOME when picking the JVM (Windows honors it) Open

Difficulty 1/5 Under an hour Newbie friendliness 90/100

sbt/sbt#9794 · Opened Sep 19, 2026
[Homebrew] Deprecation notice for "the `verified` parameter in the `url` stanza is deprecated" Open

Difficulty 1/5 Under an hour Newbie friendliness 92/100

microsoft/aspire#20257 · Opened Sep 19, 2026

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Java Good First Issues

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