Johannes Bechberger 12/12/2025

Don’t use Arrays or other Complex Types in Custom JFR Events

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This technical article discusses a limitation in JDK Flight Recorder's custom events: the poor or unsupported handling of arrays and complex data types. It demonstrates with code examples how array fields in custom JFR events do not serialize as expected, leading to missing or incorrect data in the recorded event files, and advises developers to avoid them.

Don’t use Arrays or other Complex Types in Custom JFR Events

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