apache/maven · error

Invalid TransferEvent.EventType={}; ignoring it

Error message

Invalid TransferEvent.EventType={}; ignoring it

What it means

Error "Invalid TransferEvent.EventType={}; ignoring it" thrown in apache/maven.

Source

Thrown at compat/maven-embedder/src/main/java/org/apache/maven/cli/transfer/SimplexTransferListener.java:129

                            delegate.transferInitiated(transferEvent);
                            break;
                        case STARTED:
                            delegate.transferStarted(transferEvent);
                            break;
                        case PROGRESSED:
                            delegate.transferProgressed(transferEvent);
                            break;
                        case CORRUPTED:
                            delegate.transferCorrupted(transferEvent);
                            break;
                        case SUCCEEDED:
                            delegate.transferSucceeded(transferEvent);
                            break;
                        case FAILED:
                            delegate.transferFailed(transferEvent);
                            break;
                        default:
                            LOGGER.warn("Invalid TransferEvent.EventType={}; ignoring it", type);
                    }
                } catch (TransferCancelledException e) {
                    ongoing.put(new TransferResourceIdentifier(transferEvent.getResource()), Boolean.FALSE);
                }
            });
        }
    }

    private void put(TransferEvent event, boolean last) {
        try {
            Exchange exchange;
            if (blockOnLastEvent && last) {
                exchange = new BlockingExchange(event);
            } else {
                exchange = new Exchange(event);
            }
            eventQueue.put(exchange);
            exchange.waitForProcessed();

View on GitHub (pinned to e4093d4e12)

When it happens

Trigger: Thrown at compat/maven-embedder/src/main/java/org/apache/maven/cli/transfer/SimplexTransferListener.java:129 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of apache/maven@e4093d4e12 (2026-08-21). Data as JSON: /api/errors/cdc7e89ce35ee0e1. Report an issue: GitHub.