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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().
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.
The article details a real‑world debugging case where a Java service threw a ClassCastException due to BeanUtils.copyProperties performing a shallow copy, explains the investigation steps, shows the problematic code, and presents a manual‑assignment solution along with reflections on safer alternatives.