{"record":{"id":"da29f817b1e7b6f5","repo":"apache/flink","slug":"field-id-must-not-be-null-da29f8","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/FieldSet.java","lineNumber":51,"sourceCode":"    public static final FieldSet EMPTY_SET = new FieldSet();\n\n    protected final Collection<Integer> collection;\n\n    // --------------------------------------------------------------------------------------------\n\n    /** Creates a new empty set of fields. */\n    public FieldSet() {\n        this.collection = Collections.emptySet();\n    }\n\n    /**\n     * Creates a set with one field.\n     *\n     * @param fieldID The id of the field.\n     */\n    public FieldSet(Integer fieldID) {\n        if (fieldID == null) {\n            throw new IllegalArgumentException(\"Field ID must not be null.\");\n        }\n\n        this.collection = Collections.singleton(fieldID);\n    }\n\n    /**\n     * Creates a set with the given fields.\n     *\n     * @param fieldIDs The IDs of the fields.\n     */\n    public FieldSet(int... fieldIDs) {\n        if (fieldIDs == null || fieldIDs.length == 0) {\n            this.collection = Collections.emptySet();\n        } else {\n            HashSet<Integer> set = new HashSet<Integer>(2 * fieldIDs.length);\n            for (int i = 0; i < fieldIDs.length; i++) {\n                set.add(fieldIDs[i]);\n            }","sourceCodeStart":33,"sourceCodeEnd":69,"githubUrl":"https://github.com/apache/flink/blob/2f3c205e9266cb30240eb7f4fdab15cad629a70f/flink-core/src/main/java/org/apache/flink/api/common/operators/util/FieldSet.java#L33-L69","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"}