{"record":{"id":"7b54f8fb3b5eec92","repo":"FasterXML/jackson-databind","slug":"trying-to-resolve-a-forward-reference-with-id-i","errorCode":null,"errorMessage":"Trying to resolve a forward reference with id [${id.toString()}] that wasn't previously registered.","messagePattern":"Trying to resolve a forward reference with id \\[(.+?)\\] that wasn't previously registered\\.","errorType":"exception","errorClass":"IllegalArgumentException","httpStatus":null,"severity":"error","filePath":"src/main/java/tools/jackson/databind/deser/SettableAnyProperty.java","lineNumber":298,"sourceCode":"        private final SettableAnyProperty _parent;\n        private final Object _pojo;\n        private final String _propName;\n\n        public AnySetterReferring(SettableAnyProperty parent,\n                UnresolvedForwardReference reference, Class<?> type, Object instance, String propName)\n        {\n            super(reference, type);\n            _parent = parent;\n            _pojo = instance;\n            _propName = propName;\n        }\n\n        @Override\n        public void handleResolvedForwardReference(DeserializationContext ctxt, Object id, Object value)\n            throws JacksonException\n        {\n            if (!hasId(id)) {\n                throw new IllegalArgumentException(\"Trying to resolve a forward reference with id [\" + id.toString()\n                        + \"] that wasn't previously registered.\");\n            }\n            _parent.set(ctxt, _pojo, _propName, value);\n        }\n    }\n\n    /*\n    /**********************************************************************\n    /* Concrete implementations\n    /**********************************************************************\n     */\n\n    protected static class MethodAnyProperty extends SettableAnyProperty\n    {\n        public MethodAnyProperty(BeanProperty property,\n                AnnotatedMember field, JavaType valueType,\n                KeyDeserializer keyDeser,\n                ValueDeserializer<Object> valueDeser, TypeDeserializer typeDeser) {","sourceCodeStart":280,"sourceCodeEnd":316,"githubUrl":"https://github.com/FasterXML/jackson-databind/blob/87876ca5c0569b4933aec2d30d6225e4b9ba3a43/src/main/java/tools/jackson/databind/deser/SettableAnyProperty.java#L280-L316","documentation":"Thrown by AnySetterReferring.handleResolvedForwardReference when an @JsonIdentityInfo forward reference is resolved with an id that was never registered as pending. The any-setter maintains a set of seen ids; resolving one that does not exist means the id stream is inconsistent with what was recorded during deserialization.","triggerScenarios":"Manually calling ObjectIdResolver.resolveReference with an id that was not encountered as unresolved; using @JsonIdentityInfo on a type involved in an @JsonAnySetter where the JSON content for object ids is malformed or reordered; mixing manually-resolved forward references with the framework's own bookkeeping.","commonSituations":"Hand-rolled code that calls bindReference/handleResolvedForwardReference directly; corrupted JSON where an @id has no preceding forward reference; concurrent deserialization sharing a ReadableObjectId store; partial deserialization (e.g. @JsonIdentityInfo + custom parser) losing pending ids.","solutions":["Let Jackson resolve forward references automatically instead of calling handleResolvedForwardReference yourself.","Ensure the JSON was produced by a serializer using the same @JsonIdentityInfo configuration so every resolved id has a matching pending forward reference.","If resolving manually, check hasId(id) before calling handleResolvedForwardReference and skip unknown ids.","Verify there is no second ObjectMapper instance serializing/deserializing with a different identity-info scheme."],"exampleFix":"// before\nroid.handleResolvedForwardReference(ctxt, id, value); // id unknown -> throws\n\n// after\nif (roid.hasId(id)) {\n    roid.handleResolvedForwardReference(ctxt, id, value);\n} else {\n    // log / skip unknown id\n}","handlingStrategy":"try-catch","validationCode":"if (!roid.hasId(id)) {\n    // skip; id was never pending\n    return;\n}","typeGuard":"// no static type guard; runtime membership check via hasId(Object)","tryCatchPattern":"try { roid.handleResolvedForwardReference(ctxt, id, value); }\ncatch (IllegalArgumentException e) {\n    if (e.getMessage().contains(\"wasn't previously registered\")) {\n        // log and skip the unknown id\n    } else throw e;\n}","preventionTips":["Let Jackson manage forward-reference resolution automatically; avoid manual handleResolvedForwardReference calls.","Always use the same @JsonIdentityInfo configuration for serialization and deserialization."],"tags":["deserialization","object-identity","forward-reference","any-setter"],"backgroundTag":null,"analyzedSha":"87876ca5c0569b4933aec2d30d6225e4b9ba3a43","analyzedAt":"2026-08-11T12:55:24.033Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-23T08:17:48.524Z"}