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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[C Data] Format.asString emits locale dependent digits in format strings Open

Type: bug

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

apache/arrow-java#1300 · Opened Sep 19, 2026
Modification time is not preserved when uploading MediaStore content via Android share Open

0. Needs triage bug

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

nextcloud/android#17675 · Opened Sep 19, 2026
Workflows do not declare least-privilege token permissions Open

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

objectionary/eo-http#61 · Opened Sep 19, 2026
XCOP workflow runs a moving action branch Open

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

objectionary/eo-http#60 · Opened Sep 19, 2026
PDD and xcop workflows run moving action branches Open

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

objectionary/jucs#132 · Opened Sep 19, 2026
`mvnw` Promise remains pending instead of rejecting on child process `error` event Open

bug good-title

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

objectionary/eoc#1360 · Opened Sep 19, 2026
`parserVersion.get()` crashes when HTTP metadata lacks `metadata.versioning.release` field Open

bug good-title

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

objectionary/eoc#1359 · Opened Sep 19, 2026
Synchronous throw occurs when `javac` is unavailable for `dataize` and `inspect` commands Open

bug good-title

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

objectionary/eoc#1358 · Opened Sep 19, 2026
PDD workflow executes a mutable action branch Open

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

objectionary/eoc#1357 · Opened Sep 19, 2026
titles workflow exposes the OpenAI key to a third-party action on every opened issue Open

Difficulty 2/5 1-3 hours Newbie friendliness 64/100

objectionary/lints#1495 · Opened Sep 19, 2026
titles workflow exposes the OpenAI key to a third-party action on every opened issue Open

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

objectionary/eoc#1356 · Opened Sep 19, 2026
titles workflow exposes the OpenAI key to a third-party action on every opened issue Open

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

objectionary/eo#8853 · Opened Sep 19, 2026
bdd-report-plugin hosting request Open

hosting-request needs-fix on-hold security-audit-done

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

jenkins-infra/repository-permissions-updater#5316 · 15 comments · 1 reaction · Opened Sep 19, 2026
Homebrew formula updater generates invalid Ruby class names with prerelease versions Open

bug good-title

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

objectionary/eoc#1355 · Opened Sep 19, 2026
Maven workflow vulnerability: unsafe interpolation of github.ref_name into shell API URL Open

bug good-title

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

objectionary/lints#1494 · Opened Sep 19, 2026
eoc Telegram workflow exposes potential command execution through `github.ref_name` interpolation in shell arguments Open

bug good-title

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

objectionary/eoc#1354 · Opened Sep 19, 2026
Shell syntax in `github.ref_name` being evaluated during URL construction in Grunt workflow, causing unwanted command execution Open

bug good-title

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

objectionary/eoc#1353 · Opened Sep 19, 2026
`github.ref_name` improperly expands within a shell path in XSD workflow Open

bug good-title

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

objectionary/eo#8852 · Opened Sep 19, 2026
Security vulnerability in EO Telegram workflow: unsafe `github.ref_name` interpolation into shell command Open

bug good-title

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

objectionary/eo#8851 · Opened Sep 19, 2026
`Objectionary workflow's security vulnerability through direct interpolation of github.ref_name into a shell command` Open

bug good-title

Difficulty 2/5 1-3 hours Newbie friendliness 90/100

objectionary/eo#8850 · Opened Sep 19, 2026
benchmark.sh deletes CSV separators and fails with division by zero Open

bug

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

objectionary/hone-maven-plugin#1047 · Opened Sep 19, 2026
eoc test misconstructs Java test filter for EO objects in nested packages Open

bug good-title

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

objectionary/eoc#1352 · Opened Sep 19, 2026
hone-it.sh collides when coverage entries share a repository basename Open

bug

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

objectionary/hone-maven-plugin#1046 · Opened Sep 19, 2026
`benchmark-diff.sh` truncates fractional part of benchmark deltas Open

bug good-title

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

objectionary/lints#1493 · Opened Sep 19, 2026
`objectionary.sh` incorrectly interprets ampersands in release tags during `sed` replacement Open

bug good-title

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

objectionary/eo#8848 · Opened Sep 19, 2026
[BUG] CloudWatch Metrics: JSON GetMetricStatistics ignores the Unit filter Open

bug cloudwatch

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

floci-io/floci#3909 · Opened Sep 19, 2026
[collector] Nginx collector recompiles constant regex patterns on every collection Open

bug

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

apache/hertzbeat#4388 · Opened Sep 19, 2026
Add ID facet to `/api/v1/books/facet` for single-book lookup Open

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

grimmory-tools/grimmory#2705 · 2 comments · Opened Sep 19, 2026
Five `du` runs and a full `diff` per class run even when `HONE_VERBOSE` is false Open

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

objectionary/hone-maven-plugin#1041 · Opened Sep 19, 2026
The failure message always says `exit code 1`, because `atomic_write` throws away the real exit code Open

bug

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

objectionary/hone-maven-plugin#1040 · Opened Sep 19, 2026
`mount()` accepts a relative `hone.target` and turns the bind mount into a named Docker volume Open

bug

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

objectionary/hone-maven-plugin#1034 · Opened Sep 19, 2026
`optimize` runs the container with `--privileged` and the host Docker socket, though nothing in the image can use either Open

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

objectionary/hone-maven-plugin#1033 · Opened Sep 19, 2026
OPDS pagination serves some books twice and others never, when books share an addedOn second Open

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

grimmory-tools/grimmory#2701 · Opened Sep 19, 2026
printing: bump Android Java source/target from 8 to 17 Open

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

DavBfr/dart_pdf#1975 · Opened Sep 19, 2026
Skill Calculator: Incorrect Level Requirements for Hallowed Sepulchre Open

good-for-first-contribution skill-calc

Difficulty 2/5 1-3 hours Newbie friendliness 74/100

runelite/runelite#20522 · Opened Sep 19, 2026
关于EightImmortalsTableBlock在onRemove方法上的问题 Open

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

KaleidoscopeMods/KaleidoscopeCookery#216 · Opened Sep 19, 2026
`Heaps.write` and `Heaps.resize` incorrectly report 'can't read' and 'can't get size' for freed block Open

bug good-title

Difficulty 1/5 Under an hour Newbie friendliness 88/100

objectionary/eo#8841 · Opened Sep 19, 2026
JSONML checks childNode instead of the reserved childNodes attribute Open

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

stleary/JSON-java#1080 · Opened Sep 19, 2026
JSONML decodes text entities twice with keepStrings enabled Open

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

stleary/JSON-java#1079 · Opened Sep 19, 2026
`directory.listed` triggers undefined behavior by reading closed directory handle twice due to unforced `entries` Open

bug good-title

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

objectionary/eo#8839 · 1 comment · Opened Sep 19, 2026
`eoc clean` command unintentionally deletes parent directory of home directory Open

bug good-title

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

objectionary/eoc#1350 · Opened Sep 19, 2026
🔒 [IBM OSPO Security Notification] — IBM/OpenJCEPlus Open

security

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

IBM/OpenJCEPlus#1822 · Opened Sep 19, 2026
Date claims before the Unix epoch are rounded toward zero Open

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

auth0/java-jwt#806 · Opened Sep 19, 2026
Avoid Kotlin reflection in KotlinReflectionUtils.isSuspend for methods without a Continuation parameter Open

status: waiting-for-triage

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

spring-projects/spring-data-commons#3544 · Opened Sep 19, 2026
Flink 1.18: connector and format parity matrix Open

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

datafusion-contrib/StreamFusion#187 · Opened Sep 19, 2026
[image_picker_android] ImageResizer never downsamples: calculateSampleSize reads an Options object that was never decoded Open

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

flutter/flutter#193036 · Opened Sep 19, 2026
[jdbc-v2] Fix ArrayResultSet after-last cursor state Open

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

ClickHouse/clickhouse-java#3143 · Opened Sep 18, 2026
[5.26 LTS] Upgrade Maven Plugin Tools to avoid plexus-archiver 4.6.3 Open

bug

Difficulty 1/5 Under an hour Newbie friendliness 88/100

neo4j/neo4j#13983 · Opened Sep 18, 2026
Add ZonedDateTime methods to generic whitelist Open

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

jenkinsci/script-security-plugin#930 · Opened Sep 18, 2026
Docs: the REST Client guide never names the REST Client JSON-B extension Open

area/rest-client

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

quarkusio/quarkus#56879 · 1 comment · Opened Sep 18, 2026

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