出现错误了，应该是没有StandardServiceRegistryBuilder包

Exception in thread "main" java.lang.NoSuchMethodError: org.hibernate.integrator.internal.IntegratorServiceImpl.<init>(Ljava/util/LinkedHashSet;Lorg/hibernate/boot/registry/classloading/spi/ClassLoaderService;)V

at org.hibernate.boot.registry.BootstrapServiceRegistryBuilder.build(BootstrapServiceRegistryBuilder.java:215)

at org.hibernate.boot.registry.StandardServiceRegistryBuilder.<init>(StandardServiceRegistryBuilder.java:71)

at com.imooc.util.HibernateUtil.<clinit>(HibernateUtil.java:17)

at com.imooc.entity.Test.findStudentsByGrade(Test.java:40)

at com.imooc.entity.Test.main(Test.java:15)