ClickHouse/clickhouse-java

ClickHouse Java Clients & JDBC Driver

Stars: 1.6k
Forks: 637
Open beginner issues: 9
Indexed issues: 158
Avg merge: 2d 16h
Merged PRs (30d): 30

Dominant language: Java
License: Apache-2.0
Last GitHub push: Sep 19, 2026
Latest indexed: Sep 15, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: No beginner labels indexed

Beginner friendly Everything

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[examples] Remove old Spring example Open

Difficulty 1/5 Under an hour Newbie friendliness 85/100

ClickHouse/clickhouse-java#3111 · Opened Sep 9, 2026
[client-v2] ClickHouseColumn mis-parses a Tuple whose JSON element is not last: later elements are swallowed as JSON parameters Open

area:data-type bug

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

ClickHouse/clickhouse-java#3098 · 1 comment · Opened Sep 3, 2026
Flaky test: HttpTransportTests.testAccessTokenAuth / testBearerTokenAuth bind a random fixed port and fail with FatalStartupException Open

bug client-api-v2 test

Difficulty 2/5 1-3 hours Newbie friendliness 92/100

ClickHouse/clickhouse-java#3076 · Opened Aug 25, 2026
clickhouse-data (v1): ClickHouseUtils.skipSingleLineComment jumps to end of query for an empty -- comment, dropping the rest of the SQL Open

area:sql-parser bug client-v1

Difficulty 1/5 1-3 hours Newbie friendliness 92/100

ClickHouse/clickhouse-java#3066 · Opened Aug 19, 2026
[client-v2, jdbc-v2] SQLUtils.enquoteLiteral / enquoteIdentifier do not escape backslashes, corrupting or breaking SQL Open

area:general bug client-api-v2 jdbc jdbc-v2

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

ClickHouse/clickhouse-java#3063 · Opened Aug 18, 2026
Add missing `Hash` output format to `ClickHouseFormat` enum (JDBC/DataGrip throws "No enum constant ... Hash") Open

bug client-api-v2 jdbc-v2

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

ClickHouse/clickhouse-java#2957 · 1 comment · Opened Jul 24, 2026
client-v1 (clickhouse-data): "Duplicate key" IllegalStateException on result sets with duplicate column names (0.9.8) Open

bug client-v1 wontfix

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

ClickHouse/clickhouse-java#2895 · 1 comment · Opened Jun 25, 2026
[jdbc-v2,client-v2] Configuration in migration guide should be clear Open

area:docs jdbc jdbc-v2

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

ClickHouse/clickhouse-java#2892 · 1 reaction · Opened Jun 24, 2026
[client-v2] Default sends query parameters in URI, causing HTTP 414 for large IN-lists / vector embeddings Open

area:general client-api-v2

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

ClickHouse/clickhouse-java#2856 · 1 comment · Opened May 15, 2026

A short digest of beginner-friendly GitHub issues.