问使用具有CompositeItemWriter的JdbcBatchItemWriters将不同的对象类型写入不同的表

EN

  class Project {
      ProjectItem projectItem;
      ItemOwner owner;
  }
  @Bean 
  JdbcBatchItemWriter projectItemWriter(DataSource datasource){
      return new JdbcBatchItemWriter<ProjectItem> {
      ... etc
  }
  
  @Bean 
  JdbcBatchItemWriter itemOwnerWriter(DataSource datasource){
      return new JdbcBatchItemWriter<ItemOwner> {
      ... etc
  }
  
   @Bean
   CompositeItemWriter<Project> txnWriter() {
    return new CompositeItemWriterBuilder<Department>()
            .delegates(projectItemWriter(null),
                    itemOwnerWriter(null))
            .build();
  }