Apache Cassandra 5.0+OpenJDK 21

Why?

Why is Apache Cassandra 5.0 incompatible with OpenJDK 21?

Requirement

OpenJDK >=11.0.0,<18.0.0

Selected version

OpenJDK 21

Evaluation

21.0.12.1 does not satisfy >=11.0.0,<18.0.0

Conclusion

INCOMPATIBLE

Evidence

CompatHub reports compatibility from upstream sources rather than making unsupported claims of its own.

• Apache Cassandra Java Requirements

  Confidence: HIGH

  https://raw.githubusercontent.com/apache/cassandra/cassandra-5.0.9/NEWS.txt

  Retrieved 2 September 2026

  Requirement: >=11.0.0,<18.0.0

OpenJDK versions

Compatibility is derived from the project's declared OpenJDK requirement (>=11.0.0,<18.0.0); it does not mean every version combination has been independently tested.

• 10❌
• 11✓
• 12✓
• 13✓
• 14✓
• 15✓
• 16✓
• 17✓
• 18❌
• 19❌
• 20❌
• 21❌
• 22❌

Other OpenJDK versions satisfying this requirement

Apache Cassandra 5.0 — compatible OpenJDK lines tracked in CompatHub

• ✓OpenJDK 11version linesupported
• ✓OpenJDK 12version lineEOL
• ✓OpenJDK 13version lineEOL
• ✓OpenJDK 14version lineEOL
• ✓OpenJDK 15version lineEOL
• ✓OpenJDK 16version lineEOL
• ✓OpenJDK 17version linesupported

Other Apache Cassandra versions

Only lines with relevant compatibility evidence are listed.

• Apache Cassandra 5.0
• Apache Cassandra 4.1
• Apache Cassandra 4.0

Lifecycle context

Lifecycle status is separate from compatibility. An EOL component can still satisfy a documented version requirement.