apache/flink · error · java.lang.IllegalArgumentException

Invalid 'properties' property for object type in node: {}

Error message

Invalid 'properties' property for object type in node: {}

What it means

Error "Invalid 'properties' property for object type in node: {}" thrown in apache/flink.

Source

Thrown at flink-formats/flink-json/src/main/java/org/apache/flink/formats/json/JsonRowSchemaConverter.java:247

                    "Union types with more than just a null type are not supported yet.");
        }

        // return the first non-void type or void
        if (types.size() == 2 && types.get(0) == Types.VOID) {
            return types.get(1);
        } else {
            return types.get(0);
        }
    }

    private static TypeInformation<Row> convertObject(
            String location, JsonNode node, JsonNode root) {
        // validate properties
        if (!node.has(PROPERTIES)) {
            return Types.ROW();
        }
        if (!node.isObject()) {
            throw new IllegalArgumentException(
                    "Invalid '" + PROPERTIES + "' property for object type in node: " + location);
        }
        final JsonNode props = node.get(PROPERTIES);
        final String[] names = new String[props.size()];
        final TypeInformation<?>[] types = new TypeInformation[props.size()];

        final Iterator<Map.Entry<String, JsonNode>> fieldIter = props.fields();
        int i = 0;
        while (fieldIter.hasNext()) {
            final Map.Entry<String, JsonNode> subNode = fieldIter.next();

            // set field name
            names[i] = subNode.getKey();

            // set type
            types[i] = convertType(location + '/' + subNode.getKey(), subNode.getValue(), root);

            i++;

View on GitHub (pinned to 2f3c205e92)

Solutions

1. Address the cause reported by the error message: Invalid 'properties' property for object type in node: 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 ("Invalid 'properties' property for object type in node: the reported value") and rerun the job or command.

When it happens

Trigger: Triggered at runtime when the operation fails because: Invalid 'properties' property for object type in node: the reported value.

Common situations: Commonly caused by misconfiguration, missing dependencies or files, unsupported types or operations, or invalid user input leading to: Invalid 'properties' property for object type in node: the reported value.

AI-assisted analysis of apache/flink@2f3c205e92 (2026-08-14). Data as JSON: /api/errors/8012a70b1031e7fe. Report an issue: GitHub.