小编Har*_*tel的帖子

就 Java 1.8 而言，顺序流和并行流之间的功能区别是什么，输出将如何受到影响？

以及在哪些场景下选择并行或顺序流？

Java中顺序流和并行流的处理方法有什么区别？！

我尝试了下面的代码片段来用少量数据对其进行测试，但输出没有任何异常差异。！！

ArrayList<Integer> arrayList = new ArrayList<>();
for(int i = 1; i <= 100;i++) arrayList.add(i);

arrayList.stream().filter(l -> l > 90).forEach(l -> System.out.println(l));

arrayList.parallelStream().filter(l -> l > 90).forEach(l -> System.out.println(l));

我试图使用@CreationTimestamp和@UpdateTimestamp与LocalDateTime类型，但它给我org.hibernate.HibernateException:的发电机注释不支持的属性类型@CreationTimestamp的异常。

我正在Java 5.0中使用5.0.12.hibernate版本LocalDataTime，

有没有办法使用@UpdateTimestamp，并@CreationTimestamp与Java 8 LocalDateTime？

 org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaAutoConfiguration.class]: Invocation of init method failed; nested exception is org.hibernate.HibernateException: Unsupported property type for generator annotation @CreationTimestamp
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1628)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
    at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1080)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:857)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543)
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693)
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) …