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…Object In the fastjson1-compatible module, JSON.toJavaObject(json, clazz) delegates to ObjectReader.createInstance. On some JDK/architecture combinations (e.g. ARM aarch64 JDK8) this throws IntrospectionException when the source JSONObject contains an extra field whose key is not a property of the target bean (e.g. "/*"), while x86-64 JDK8 silently ignores it. fastjson 1.2.83 caught this exception internally; the 2.0.x compat layer omitted that logic during porting. Catch the exception and fall back to a property-by-property copy that only sets the target bean's own properties and drops unknown keys, restoring consistent cross-platform behavior. Fixes alibaba#7782
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Summary
In the
fastjson1-compatiblemodule,JSON.toJavaObject(json, clazz)delegates toObjectReader.createInstance. When the sourceJSONObjectcontains an extra field whose key is not a property of the target bean (e.g./*),createInstancethrowsIntrospectionExceptionon some JDK/architecture combinations (reported on ARM aarch64 JDK8), while x86-64 JDK8 silently ignores it. fastjson 1.2.83 caught this exception internally; the 2.0.x compat layer dropped that logic during the port, causing inconsistent cross-platform behavior (see #7782).Root cause
JSONObject.toJavaObject(Class)callsobjectReader.createInstance(this, ...)without the defensiveIntrospectionExceptionhandling that fastjson 1.2.83 had.Fix
Wrap the
createInstancecall in a try/catch. On failure, fall back to a property-by-property copy that only sets the target bean's own writable properties viajava.beans.Introspector, dropping unknown keys — restoring the 1.x behavior consistently on all platforms.Test
Added
Issue7782regression test: aJSONObjectwith a normalnamefield plus an extra/*field is converted to the target bean; the bean is produced andnameis correctly populated.Fixes #7782