{"record":{"id":"970d92f290ddf304","repo":"oracle/graal","slug":"expected-an-espressoexternalobjectconstant-got","errorCode":null,"errorMessage":"expected an EspressoExternalObjectConstant got {}","messagePattern":"expected an EspressoExternalObjectConstant got (.+?)","errorType":"validation","errorClass":"IllegalArgumentException","httpStatus":null,"severity":"error","filePath":"espresso-compiler-stub/src/com.oracle.truffle.espresso.vmaccess/src/com/oracle/truffle/espresso/vmaccess/EspressoExternalMetaAccessProvider.java","lineNumber":184,"sourceCode":"        } else {\n            fields = declaringType.getInstanceFields(false);\n        }\n        EspressoResolvedJavaType type = lookupJavaType(reflectionField.getType());\n        for (ResolvedJavaField field : fields) {\n            if (field.getName().equals(name) && field.getType().equals(type)) {\n                return field;\n            }\n        }\n        throw new NoSuchFieldError(reflectionField.toString());\n    }\n\n    @Override\n    public ResolvedJavaType lookupJavaType(JavaConstant constant) {\n        if (constant.isNull() || constant.getJavaKind().isPrimitive()) {\n            return null;\n        }\n        if (!(constant instanceof EspressoExternalObjectConstant objectConstant)) {\n            throw new IllegalArgumentException(\"expected an EspressoExternalObjectConstant got \" + safeGetClass(constant));\n        }\n        return objectConstant.getType();\n    }\n\n    @Override\n    public Signature parseMethodDescriptor(String methodDescriptor) {\n        return new EspressoExternalSignature(access, methodDescriptor);\n    }\n\n    @Override\n    public long getMemorySize(JavaConstant constant) {\n        throw JVMCIError.unimplemented();\n    }\n\n    @Override\n    public JavaConstant encodeDeoptActionAndReason(DeoptimizationAction action, DeoptimizationReason reason, int debugId) {\n        throw JVMCIError.unimplemented();\n    }","sourceCodeStart":166,"sourceCodeEnd":202,"githubUrl":"https://github.com/oracle/graal/blob/a66e9ccd1d7bf2552883939aa0788dfd0e294aab/espresso-compiler-stub/src/com.oracle.truffle.espresso.vmaccess/src/com/oracle/truffle/espresso/vmaccess/EspressoExternalMetaAccessProvider.java#L166-L202","documentation":"Error \"expected an EspressoExternalObjectConstant got {}\" thrown in oracle/graal.","triggerScenarios":"Thrown at espresso-compiler-stub/src/com.oracle.truffle.espresso.vmaccess/src/com/oracle/truffle/espresso/vmaccess/EspressoExternalMetaAccessProvider.java:184 when the library encounters an invalid state.","commonSituations":"Occurs when a caller violates the contract guarded by this check: expected an EspressoExternalObjectConstant got {}","solutions":["Fix the condition reported by the error: expected an EspressoExternalObjectConstant got {}","Check the throwing call site and ensure its documented preconditions (argument values, types, environment, or configuration) are satisfied before the call."],"exampleFix":"Validate inputs and environment so that the failing condition does not occur: expected an EspressoExternalObjectConstant got {}","handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"a66e9ccd1d7bf2552883939aa0788dfd0e294aab","analyzedAt":"2026-08-14T13:58:47.161Z","schemaVersion":2},"datasetVersion":"2026-08-15T22:17:37.221Z"}