apache/flink · error · java.lang.UnsupportedOperationException

Unsupported type: {}

Error message

Unsupported type: {}

What it means

Error "Unsupported type: {}" thrown in apache/flink.

Source

Thrown at flink-formats/flink-json/src/main/java/org/apache/flink/formats/json/JsonToRowDataConverters.java:162

            case DECIMAL:
                return createDecimalConverter((DecimalType) type);
            case ARRAY:
                return createArrayConverter((ArrayType) type);
            case MAP:
                MapType mapType = (MapType) type;
                return createMapConverter(
                        mapType.asSummaryString(), mapType.getKeyType(), mapType.getValueType());
            case MULTISET:
                MultisetType multisetType = (MultisetType) type;
                return createMapConverter(
                        multisetType.asSummaryString(),
                        multisetType.getElementType(),
                        new IntType());
            case ROW:
                return createRowConverter((RowType) type);
            case RAW:
            default:
                throw new UnsupportedOperationException("Unsupported type: " + type);
        }
    }

    private boolean convertToBoolean(JsonNode jsonNode) {
        if (jsonNode.isBoolean()) {
            // avoid redundant toString and parseBoolean, for better performance
            return jsonNode.asBoolean();
        } else {
            return Boolean.parseBoolean(jsonNode.asText().trim());
        }
    }

    private int convertToInt(JsonNode jsonNode) {
        if (jsonNode.canConvertToInt()) {
            // avoid redundant toString and parseInt, for better performance
            return jsonNode.asInt();
        } else {
            return Integer.parseInt(jsonNode.asText().trim());

View on GitHub (pinned to 2f3c205e92)

Solutions

1. Address the cause reported by the error message: Unsupported type: the reported value
2. Verify the inputs, configuration values, and classpath/dependency setup related to this operation, then retry.

Example fix

Correct the condition described ("Unsupported type: the reported value") and rerun the job or command.

When it happens

Trigger: Triggered at runtime when the operation fails because: Unsupported type: the reported value.

Common situations: Commonly caused by misconfiguration, missing dependencies or files, unsupported types or operations, or invalid user input leading to: Unsupported type: the reported value.

AI-assisted analysis of apache/flink@2f3c205e92 (2026-08-14). Data as JSON: /api/errors/4a81aa70e6c832dc. Report an issue: GitHub.