控制台详细信息

Exception in thread "main" org.hibernate.InstantiationException: No default constructor for entity:  : com.imooc.entity.Student

at org.hibernate.tuple.PojoInstantiator.instantiate(PojoInstantiator.java:120)

at org.hibernate.tuple.PojoInstantiator.instantiate(PojoInstantiator.java:136)

at org.hibernate.tuple.entity.AbstractEntityTuplizer.instantiate(AbstractEntityTuplizer.java:737)

at org.hibernate.persister.entity.AbstractEntityPersister.instantiate(AbstractEntityPersister.java:4755)

at org.hibernate.internal.SessionImpl.instantiate(SessionImpl.java:1387)

at org.hibernate.internal.SessionImpl.instantiate(SessionImpl.java:1375)

at org.hibernate.loader.plan.exec.process.internal.EntityReferenceInitializerImpl.hydrateEntityState(EntityReferenceInitializerImpl.java:235)

at org.hibernate.loader.plan.exec.process.internal.AbstractRowReader.readRow(AbstractRowReader.java:107)

at org.hibernate.loader.plan.exec.process.internal.ResultSetProcessorImpl.extractResults(ResultSetProcessorImpl.java:129)

at org.hibernate.loader.plan.exec.internal.AbstractLoadPlanBasedLoader.executeLoad(AbstractLoadPlanBasedLoader.java:138)

at org.hibernate.loader.plan.exec.internal.AbstractLoadPlanBasedLoader.executeLoad(AbstractLoadPlanBasedLoader.java:102)

at org.hibernate.loader.collection.plan.AbstractLoadPlanBasedCollectionInitializer.initialize(AbstractLoadPlanBasedCollectionInitializer.java:102)

at org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:693)

at org.hibernate.event.internal.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:92)

at org.hibernate.internal.SessionImpl.initializeCollection(SessionImpl.java:1893)

at org.hibernate.collection.internal.AbstractPersistentCollection$4.doWork(AbstractPersistentCollection.java:555)

at org.hibernate.collection.internal.AbstractPersistentCollection.withTemporarySessionIfNeeded(AbstractPersistentCollection.java:260)

at org.hibernate.collection.internal.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:551)

at org.hibernate.collection.internal.AbstractPersistentCollection.read(AbstractPersistentCollection.java:140)

at org.hibernate.collection.internal.PersistentSet.iterator(PersistentSet.java:180)

at com.imooc.entity.Test.findStudentsByGrade(Test.java:42)

at com.imooc.entity.Test.main(Test.java:14)