{"record":{"id":"910da956d0d84e00","repo":"apache/flink","slug":"field-id-must-not-be-null","errorCode":null,"errorMessage":"Field ID must not be null.","messagePattern":"Field ID must not be null\\.","errorType":"validation","errorClass":"IllegalArgumentException","httpStatus":null,"severity":"error","filePath":"flink-core/src/main/java/org/apache/flink/api/common/operators/util/FieldList.java","lineNumber":60,"sourceCode":"\n    public FieldList(Integer fieldId) {\n        super(Collections.singletonList(checkNotNull(fieldId, \"The fields ID must not be null.\")));\n    }\n\n    public FieldList(int... columnIndexes) {\n        super(fromInts(columnIndexes));\n    }\n\n    private FieldList(List<Integer> fields) {\n        super(fields);\n    }\n\n    // --------------------------------------------------------------------------------------------\n\n    @Override\n    public FieldList addField(Integer fieldID) {\n        if (fieldID == null) {\n            throw new IllegalArgumentException(\"Field ID must not be null.\");\n        }\n\n        if (size() == 0) {\n            return new FieldList(fieldID);\n        } else {\n            ArrayList<Integer> list = new ArrayList<Integer>(size() + 1);\n            list.addAll(this.collection);\n            list.add(fieldID);\n            return new FieldList(Collections.unmodifiableList(list));\n        }\n    }\n\n    @Override\n    public FieldList addFields(int... fieldIDs) {\n        if (fieldIDs == null || fieldIDs.length == 0) {\n            return this;\n        }\n        if (size() == 0) {","sourceCodeStart":42,"sourceCodeEnd":78,"githubUrl":"https://github.com/apache/flink/blob/2f3c205e9266cb30240eb7f4fdab15cad629a70f/flink-core/src/main/java/org/apache/flink/api/common/operators/util/FieldList.java#L42-L78","documentation":"Error \"Field ID must not be null.\" thrown in apache/flink.","triggerScenarios":"Triggered at runtime when the operation fails because: Field ID must not be null.","commonSituations":"Commonly caused by misconfiguration, missing dependencies or files, unsupported types or operations, or invalid user input leading to: Field ID must not be null.","solutions":["Address the cause reported by the error message: Field ID must not be null.","Verify the inputs, configuration values, and classpath/dependency setup related to this operation, then retry."],"exampleFix":"Correct the condition described (\"Field ID must not be null.\") and rerun the job or command.","handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"2f3c205e9266cb30240eb7f4fdab15cad629a70f","analyzedAt":"2026-08-14T08:48:24.518Z","schemaVersion":2},"datasetVersion":"2026-08-14T10:17:34.591Z"}