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JDK 27 Changes JSON Thread Dumps to Use Numeric Types for Identifiers and Counts

by Ana-Maria Mihalceanu on May 20, 2026

13d ago· 2 min readenNews

technology programming

Summary

The OpenJDK Quality Group announces that JDK 27 will change JSON thread dumps to emit thread identifiers, thread counts, and process identifiers as JSON numeric types instead of strings. This affects JSON thread dumps generated by com.sun.management.HotSpotDiagnosticMXBean.dumpThreads and the jcmd Thread.dump_to_file command. The change is part of ongoing quality outreach efforts to improve OpenJDK releases through testing of FOSS projects.

Source

bskyJDK 27 Changes JSON Thread Dumps to Use Numeric Types for Identifiers and Countsinside.java

Key quotes

· 3 pulled

JSON thread dumps generated by com.sun.management.HotSpotDiagnosticMXBean.dumpThreads and the jcmd Thread.dump_to_file command now write thread identifiers, thread counts, and the process identifier as JSON numbers

The OpenJDK Quality Group is promoting the testing of FOSS projects with OpenJDK builds as a way to improve the overall quality of the release.

This heads-up is part of a Quality Outreach update sent to the projects involved.

Snippet from the RSS feed

This Heads-Up is part of the regular communication sent to the projects involved; it covers thatJSON thread dumps now emit thread identifiers, thread counts, and the process identifier as numeric types.

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