apache/arrow-java

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Official Java implementation of Apache Arrow

Stars: 95
Forks: 154
Open beginner issues: 8
Indexed issues: 432
Avg merge: 2d 10h
Merged PRs (30d): 11

Dominant language: Java
License: Apache-2.0
Last GitHub push: Sep 16, 2026
Latest indexed: Sep 14, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted good first issue

Beginner friendly Everything

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DictionaryEncoder.decode accepts out-of-range dictionary indices Open

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

apache/arrow-java#1261 · Opened Aug 18, 2026
ArrowFlightJdbcArray.getArray(index, count) can read past the end of the array slice Open

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

apache/arrow-java#1236 · Opened Jul 20, 2026
[Java][JDBC] ClobConsumer writes past VarCharVector data buffer for large CLOBs Open

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

apache/arrow-java#1230 · Opened Jul 15, 2026
Byte-array elements leak in `FromSchemaByteArray()` Open

Type: bug

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

apache/arrow-java#1205 · Opened Jul 4, 2026
[Java][IPC] AbstractCompressionCodec.compress() writes prefix=0 for empty buffers, incompatible with C++/Python readers Open

Type: bug

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

apache/arrow-java#1196 · 1 comment · Opened Jun 29, 2026
[Java] DictionaryEncoder doesn't crash when decoding index outside of Dictionary Open

Type: bug

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

apache/arrow-java#1158 · Opened May 19, 2026
Expose Arrow `Struct` columns as JDBC `STRUCT` metadata in the Flight SQL JDBC driver. Open

Type: enhancement

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

apache/arrow-java#1100 · Opened Mar 31, 2026
[Java] Problem to get current reservation of JVM direct memory on macOS Big Sur Open

Difficulty 2/5 1-3 hours Newbie friendliness 62/100

apache/arrow-java#349 · Opened Mar 3, 2022

apache/arrow-java

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