apache/arrow-java

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

Open All

[JAVA] Remove type parameterization in ExtensionTypeWriterFactory Open

Type: enhancement

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

apache/arrow-java#861 · Opened Sep 27, 2025
Support ISO String Binding for Date/Time/Timestamp Open

Type: enhancement

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

apache/arrow-java#853 · 1 comment · Opened Sep 17, 2025
[JAVA] FlightSQL JDBC Driver PreparedStatement#setTimestamp() ignores connection timeStampPrecision Open

Type: bug

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

apache/arrow-java#838 · 1 comment · Opened Sep 5, 2025
ArrowBuf copying from GetReadableBuffer causes slowness Open

Type: usage

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

apache/arrow-java#835 · 2 comments · Opened Sep 3, 2025
Avro adapter: AvroNullableConsumer should use readIndex Open

Type: bug

Difficulty 2/5 1-3 hours Newbie friendliness 52/100

apache/arrow-java#834 · Opened Aug 31, 2025
Avro adapter: setPosition doesn't work with BaseVariableWidthVectors Open

Type: bug

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

apache/arrow-java#833 · 2 comments · Opened Aug 31, 2025
Avro adapter: AvroStringConsumer should use readString instead of readBytes Open

Type: bug

Difficulty 1/5 Under an hour Newbie friendliness 55/100

apache/arrow-java#832 · Opened Aug 28, 2025
JSON Adapter Open

Type: enhancement

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

apache/arrow-java#831 · Opened Aug 28, 2025
'Unknown type: NULL' when initialising a NullableStructWriter from a struct with NullVector children Open

Type: bug

Difficulty 3/5 1-2 days Newbie friendliness 58/100

apache/arrow-java#830 · Opened Aug 26, 2025
Unable to Set Initial Database via JDBC Connection String Parameters Open

Type: bug

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

apache/arrow-java#829 · Opened Aug 26, 2025
VectorAppender fails with OversizedAllocationException when appending to empty UnionVector Open

Type: bug

Difficulty 3/5 1-2 days Newbie friendliness 55/100

apache/arrow-java#812 · 3 reactions · Opened Aug 7, 2025
[JAVA] Add support for ExtensionType for UnionWriter Open

Type: enhancement

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

apache/arrow-java#810 · Opened Aug 5, 2025
Can't view system tables due to Unsupported ArrowType Utf8View Open

Type: bug

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

apache/arrow-java#807 · 5 comments · Opened Jul 31, 2025
Trying to use for Android but keep getting No DefaultAllocationManager found on classpath Open

Type: bug

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

apache/arrow-java#801 · 3 comments · Opened Jul 18, 2025
Avro adapter - Read and write Avro container files Open

Type: enhancement

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

apache/arrow-java#794 · 5 comments · Opened Jul 7, 2025
Update Windows GitHub Hosted runner to use Windows > 2019 Open

Type: enhancement

Difficulty 1/5 Under an hour Newbie friendliness 55/100

apache/arrow-java#788 · Opened Jun 17, 2025
Bug Report: Column Nullability Not Honored in FlightSqlProducer Schema Open

Type: bug

Difficulty 2/5 1-3 hours Newbie friendliness 55/100

apache/arrow-java#782 · Opened Jun 2, 2025
IllegalStateException: Memory leaked when closing RootAllocator Open

Type: bug

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

apache/arrow-java#776 · 3 comments · Opened May 29, 2025
Stuck Arrow Flight Client while interacting from local workstation (MAC/Windows) - JDK 11 / Arrow v17.0.0 Open

Type: bug

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

apache/arrow-java#753 · 1 comment · Opened May 13, 2025
[Release] arrow-java-root-18.3.0-source-release.zip includes JNI binaries Open

Type: bug

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

apache/arrow-java#743 · 3 comments · 1 reaction · Opened May 11, 2025
should control the maximum memory usage Open

Type: enhancement

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

apache/arrow-java#736 · Opened Apr 30, 2025
Support parquet write from Arrow record batch Open

Type: enhancement

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

apache/arrow-java#735 · 4 comments · 1 reaction · Opened Apr 29, 2025
The real exception was swallowed by another exception in CompositeJdbcConsumer::consume Open

help wanted Type: bug

apache/arrow-java#734 · 4 comments · 1 assignee · Opened Apr 28, 2025
Flight SQL JDBC: Fix timezone/timestamp handling Open

Type: enhancement

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

apache/arrow-java#732 · 4 comments · Opened Apr 28, 2025
Arrow fails with Netty 4.1.120.Final+ Open

Type: bug

apache/arrow-java#728 · 9 comments · 1 reaction · 1 assignee · Opened Apr 25, 2025
Provide non blocking getFlightInfo Open

Type: enhancement

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

apache/arrow-java#719 · 2 comments · Opened Apr 19, 2025
Can't create a StructVector with a NullVector child Open

Type: bug

apache/arrow-java#690 · 1 comment · 1 assignee · Opened Mar 24, 2025
[JNI][Gandiva] LLVM generated code can't access some system functions on certain platforms Open

Type: bug

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

apache/arrow-java#657 · Opened Mar 7, 2025
Docs for Building from source need to be updated Open

Type: enhancement

apache/arrow-java#640 · 3 comments · 1 assignee · Opened Mar 1, 2025
Performance concern: fillHoles() method and read buffer expansion efficiency. Open

help wanted Type: enhancement

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

apache/arrow-java#599 · 9 comments · 3 reactions · Opened Feb 10, 2025
[Release] Add support for verifying .{asc,sha256,512} for .jar related files in `dev/release/verify_rc.sh` Open

Type: enhancement

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

apache/arrow-java#593 · 5 comments · Opened Feb 7, 2025
[Flight] Make it possible to use native gRPC Java APIs, and/or simplify the implementation Open

Type: enhancement

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

apache/arrow-java#568 · Opened Jan 27, 2025
`ComplexCopier` missing support for FixedSizeBinary columns Open

good first issue help wanted Type: enhancement

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

apache/arrow-java#559 · 4 comments · 1 reaction · Opened Jan 24, 2025
`ComplexCopier` is missing support for `Duration` columns Open

help wanted Type: enhancement

apache/arrow-java#558 · 2 comments · 1 assignee · Opened Jan 24, 2025
`ComplexCopier` is missing cases for `TimeStamp*TZ` Open

help wanted Type: enhancement

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

apache/arrow-java#551 · 1 comment · Opened Jan 21, 2025
Memory-Access Methods in sun.misc.Unsafe are deprecated for removal Open

Type: bug

apache/arrow-java#511 · 4 comments · 1 reaction · 1 assignee · Opened Jan 13, 2025
[CI] Add PR title format checker Open

Type: enhancement

Difficulty 4/5 3-5 days Newbie friendliness 32/100

apache/arrow-java#487 · 2 comments · Opened Jan 7, 2025
[CI] Try to re-enable ORC JNI tests with Valgrind or ASan for debugging Open

Type: enhancement

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

apache/arrow-java#473 · Opened Jan 2, 2025
`ListViewVector#copyFrom` Throws `IndexOutOfBoundsException` on Non-Empty Elements Open

help wanted Type: bug

Difficulty 3/5 1-2 days Newbie friendliness 52/100

apache/arrow-java#471 · Opened Dec 27, 2024
How to iterate over a record batch? Open

Type: usage

Difficulty 3/5 1-2 days Newbie friendliness 25/100

apache/arrow-java#468 · 4 comments · Opened Dec 26, 2024
Add test CI: Spark integration Open

Type: enhancement

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

apache/arrow-java#451 · Opened Dec 9, 2024
[Java] User's Exception's metadata thrown by method FlightServerMiddleware.onCallStarted() getting override and set to empty value Open

Type: bug

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

apache/arrow-java#448 · Opened Dec 4, 2024
[Java][Flight] Add middleware for auth2 bearer tokens Open

Type: enhancement

apache/arrow-java#445 · 1 assignee · Opened Dec 3, 2024
Segmentation fault creating new scanner in Java Open

Type: bug

Difficulty 5/5 Over a week Newbie friendliness 18/100

apache/arrow-java#443 · Opened Nov 30, 2024
User or username parameter? Open

Type: usage

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

apache/arrow-java#434 · 1 comment · Opened Nov 29, 2024
Add lint CI Open

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

apache/arrow-java#17 · 5 comments · Opened Nov 25, 2024
Nightly packages Open

Difficulty 3/5 1-2 days Newbie friendliness 25/100

apache/arrow-java#15 · 2 comments · Opened Nov 25, 2024
pre-commit: yamlfmt Open

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

apache/arrow-java#12 · 9 comments · Opened Nov 25, 2024
[Java][FlightRPC] Java arrow flight server stuck in reader.getDescriptor() Open

Type: usage

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

apache/arrow-java#431 · 3 comments · Opened Nov 18, 2024
[Java] MapVector written data does not meet expectations Open

Component: Documentation

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

apache/arrow-java#40 · 4 comments · Opened Nov 6, 2024

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