Debugging JaCoCo‑Induced ClassCastException Caused by Synthetic $jacocoData Field in Java

The article explains how integrating JaCoCo introduced a synthetic boolean array field ($jacocoData) that caused a ClassCastException during object encryption, analyzes the root cause by inspecting bytecode and reflection, and provides a fix by filtering synthetic fields using isSynthetic().

ClassCastExceptionJaCoCoSyntheticFields

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Debugging JaCoCo‑Induced ClassCastException Caused by Synthetic $jacocoData Field in Java

JD Tech

Aug 8, 2024 · Backend Development

Resolving JaCoCo-Induced ClassCastException Caused by Synthetic $jacocoData Field in Java Applications

This article details a Java ClassCastException caused by JaCoCo’s injected $jacocoData boolean array, explains how synthetic fields arise during bytecode instrumentation, analyzes the failing encryptObject method, and presents a fix by filtering synthetic fields using isSynthetic() to restore normal order processing.

ClassCastExceptionDebuggingJaCoCo

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Resolving JaCoCo-Induced ClassCastException Caused by Synthetic $jacocoData Field in Java Applications