apache/flink · error · java.io.IOException

Failed to deserialize JSON '%s'.

Error message

Failed to deserialize JSON '%s'.

What it means

Error "Failed to deserialize JSON '%s'." thrown in apache/flink.

Source

Thrown at flink-formats/flink-json/src/main/java/org/apache/flink/formats/json/JsonRowDataDeserializationSchema.java:98

                            out.collect(result);
                        }
                    } catch (Throwable t) {
                        if (!ignoreParseErrors) {
                            // will be caught by outer try-catch
                            throw t;
                        }
                        logParseErrorIfDebugEnabled(message, t);
                    }
                }
            } else {
                RowData result = convertToRowData(root);
                if (result != null) {
                    out.collect(result);
                }
            }
        } catch (Throwable t) {
            if (!ignoreParseErrors) {
                throw new IOException(
                        format("Failed to deserialize JSON '%s'.", new String(message)), t);
            }
            logParseErrorIfDebugEnabled(message, t);
        }
    }

    public JsonNode deserializeToJsonNode(byte[] message) throws IOException {
        return objectMapper.readTree(message);
    }

    public RowData convertToRowData(JsonNode message) {
        return (RowData) runtimeConverter.convert(message);
    }
}

View on GitHub (pinned to 2f3c205e92)

Solutions

1. Address the cause reported by the error message: Failed to deserialize JSON '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 ("Failed to deserialize JSON 'the reported value'.") and rerun the job or command.

When it happens

Trigger: Triggered at runtime when the operation fails because: Failed to deserialize JSON 'the reported value'.

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

AI-assisted analysis of apache/flink@2f3c205e92 (2026-08-14). Data as JSON: /api/errors/eceb8756847d81cb. Report an issue: GitHub.