Axon框架：应用事件后聚合标识符必须是非空的

Question

使用axon框架我有一个错误：

应用事件后，聚合标识符必须是非空的。确保在处理创建事件时最迟初始化了聚合标识符。我使用这个StorageEngine：

@Bean
public JdbcEventStorageEngine jdbcEventStorageEngine() throws Exception{
    return new JdbcEventStorageEngine(dataSource::getConnection, NoTransactionManager.INSTANCE);
}

@CommandHandler
public void handle(CreateProductCommand command) throws Exception {
    Aggregate<Product> productAggregate = null;
    try {
      productAggregate = repository.load(command.getId());
    } catch (AggregateNotFoundException exception) {
      logger.info("Aggregate with " + command.getId() + " is not found. Creating new one...");
      productAggregate = repository.newInstance(() -> new Product(command.getId()));
    }
    productAggregate.execute(product -> product.createProduct(command.getId()));
}

@Bean
public EventStorageEngine eventStorageEngine() {
  return new InMemoryEventStorageEngine();
}

Answer 1

移除spring devtools很好地解决了问题。