apache/flink · error · DeserializationException

Error reading field %s as %s

Error message

Error reading field %s as %s

What it means

Error "Error reading field %s as %s" thrown in apache/flink.

Source

Thrown at flink-core/src/main/java/org/apache/flink/types/Record.java:374

    /**
     * Deserializes the given object from the binary string, starting at the given position. If the
     * deserialization asks for more that <code>limit - offset</code> bytes, than an exception is
     * thrown.
     *
     * @param <T> The generic type of the value to be deserialized.
     * @param target The object to deserialize the data into.
     * @param offset The offset in the binary string.
     * @param limit The limit in the binary string.
     */
    private <T extends Value> void deserialize(T target, int offset, int limit, int fieldNumber) {
        final InternalDeSerializer serializer = this.serializer;
        serializer.memory = this.binaryData;
        serializer.position = offset;
        serializer.end = limit;
        try {
            target.read(serializer);
        } catch (Exception e) {
            throw new DeserializationException(
                    "Error reading field " + fieldNumber + " as " + target.getClass().getName(), e);
        }
    }

    /**
     * Sets the field at the given position to the given value. If the field position is larger or
     * equal than the current number of fields in the record, than the record is expanded to host as
     * many columns.
     *
     * <p>The value is kept as a reference in the record until the binary representation is
     * synchronized. Until that point, all modifications to the value's object will change the value
     * inside the record.
     *
     * <p>The binary representation is synchronized the latest when the record is emitted. It may be
     * triggered manually at an earlier point, but it is generally not necessary and advisable.
     * Because the synchronization triggers the serialization on all modified values, it may be an
     * expensive operation.
     *

View on GitHub (pinned to 2f3c205e92)

Solutions

1. Address the cause reported by the error message: Error reading field the reported value as 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 ("Error reading field the reported value as the reported value") and rerun the job or command.

When it happens

Trigger: Triggered at runtime when the operation fails because: Error reading field the reported value as the reported value.

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

AI-assisted analysis of apache/flink@2f3c205e92 (2026-08-14). Data as JSON: /api/errors/643c18c4a185b2f9. Report an issue: GitHub.