apache/seatunnel · error · RuntimeException

Failed to serialize WAL payload to packet wire format

Error message

Failed to serialize WAL payload to packet wire format

What it means

PacketPayloadSerializer.serialize builds an EdgeIngressPacket and writes it as JSON via Jackson. JsonProcessingException is reported as a serialization failure of the packet itself, while any other exception (e.g. IO/security errors during payload handling) is rethrown as this generic 'Failed to serialize WAL payload to packet wire format' RuntimeException. It indicates the WAL payload could not be converted to the packet wire format, so the batch cannot be sent.

Source

Thrown at seatunnel-edge-agent/seatunnel-edge-agent-transport/src/main/java/org/apache/seatunnel/edge/agent/transport/serialize/PacketPayloadSerializer.java:84

                body = compressed;
            }

            String payloadBase64 = Base64.getEncoder().encodeToString(body);

            EdgeIngressPacket packet =
                    EdgeIngressPacket.builder()
                            .version(1)
                            .payload(payloadBase64)
                            .compression(compressionType.getValue())
                            .encryption(encryptionType.getValue())
                            .iv(ivBase64)
                            .build();

            return objectMapper.writeValueAsString(packet);
        } catch (JsonProcessingException e) {
            throw new RuntimeException("Failed to serialize EdgeIngressPacket to JSON", e);
        } catch (Exception e) {
            throw new RuntimeException("Failed to serialize WAL payload to packet wire format", e);
        }
    }
}

View on GitHub (pinned to cf67b549a7)

Solutions

1. Inspect the cause chain (getCause()) of the RuntimeException to find the underlying exception from Jackson or the packet builder
2. Log the failing payload/batch and verify all packet fields (payload bytes, batchId, timestamps) are non-null and encodable
3. Check Jackson dependencies for version conflicts (use org.apache.seatunnel.shade.* as required by the project)
4. Fix the throwing serializer/getter or sanitize the payload before calling serialize

Example fix

// before
return objectMapper.writeValueAsString(packet);
// after
Object validated = Objects.requireNonNull(packet, "packet");
return objectMapper.writeValueAsString(validated);

if (packet == null || packet.getPayload() == null) { throw new IllegalArgumentException("packet and payload required"); }

try { String json = serializer.serialize(batch); } catch (RuntimeException e) { log.error("WAL serialize failed", e.getCause()); throw e; }

When it happens

Trigger: Calling PacketPayloadSerializer.serialize with a payload that makes Jackson's writeValueAsString(packet) throw a non-JsonProcessingException, or an unexpected exception while constructing the packet object (null payload fields, getter side-effects, custom serializers throwing).

Common situations: Payload containing objects with broken/throwing custom serializers; ObjectMapper misconfigured; packet builder receives nulls that violate internal invariants; classpath conflicts of shaded Jackson versions causing unexpected exceptions.

Understand the failure class

Background: "JSON serialization failed", "not JSON serializable", "Failed to serialize": why JSON marshaling errors happen and how to fix them — this error's family across 46 libraries.

Related errors

• JSON_OPERATION_FAILED
• Failed to serialize EdgeIngressPacket to JSON
• Object to json exception!
• Object json deserialization exception.
• Failed to convert row to JSON

AI-assisted analysis of apache/seatunnel@cf67b549a7 (2026-09-10). Data as JSON: /api/errors/e369dcd3ecb10193. Report an issue: GitHub.