java – 如何使用forSach与slf4j.logger.info

我正在开发一个基于 Spring Batch,Spring Boot,slf4j和 Java 8的简单应用程序.我想尽可能多地使用lambda用于学习目的. “myPojos.stream()forEach((myPojo) – > {log.info(myPojo);});”是什么问题下面？该消息抱怨“……不适用于参数<？extends MyPojo”.请注意,所有其他三个日志行都正常工作.

public class CustomItemWriter implements ItemWriter<MyPojo> {

    private static final Logger log = LoggerFactory.getLogger(CustomItemWriter.class);

    @Override
    public void write(List<? extends MyPojo> myPojos) throws Exception{
        myPojos.stream().forEach((myPojo)-> {log.info(myPojo);});//error
        myPojos.forEach(System.out::println);//it works
        myPojos.stream().forEach((myPojo) -> {System.out.println(myPojo);}); //it works
        log.info("finish"); //it works
    }

}

myPojos.stream().forEach((myPojo) -> {log.info(myPojo.toString());});

myPojos.stream().forEach(myPojo -> log.info(myPojo.toString()));