objectinstantiation

Instantiate objects without using new operator

陌路散爱 提交于 2019-11-30 06:47:10
问题 In one of the java interview, the following question is asked: In java is there a way to instantiate an object without using new operator? I replied to him that there is no other way of instantiation. But he asked me how an object in java is instantiated with the configurations in an xml file in java(in spring framework). I said, internally the spring uses reflection utils to create an object with a new operator. But the interviewer was not convinced with my answer. I saw this link to be

Instantiate objects without using new operator

我们两清 提交于 2019-11-28 21:42:37
In one of the java interview, the following question is asked: In java is there a way to instantiate an object without using new operator? I replied to him that there is no other way of instantiation. But he asked me how an object in java is instantiated with the configurations in an xml file in java(in spring framework). I said, internally the spring uses reflection utils to create an object with a new operator. But the interviewer was not convinced with my answer. I saw this link to be useful but there is a new operator indirectly involved in one or the other internal methods. Is there

Simple hibernate query returning very slowly

筅森魡賤 提交于 2019-11-26 18:55:22
I have the following hibernate query: Query query = session.createQuery("from MyHibernateClass"); List<MyHibernateClass> result = query.list();// executes in 7000ms When logging the sql being executed in MySQL I see select myhibernat0_.myFirstColumn as myfirstcolumn92_, myhibernat0_.mySecondColumn as mysecondcolumn92_, myhibernat0_.mythirdcolumn as mythirdcolumn92_, myhibernat0_.myFourthColumn as myfourthcolumn92_ from MyHibernateClass myhibernat0_ where (1=1); When measurering the java code in the jvm on a small dataset of 3500 rows in MyHibernateClass database table this takes about 7000ms.

Simple hibernate query returning very slowly

和自甴很熟 提交于 2019-11-26 06:02:02
问题 I have the following hibernate query: Query query = session.createQuery(\"from MyHibernateClass\"); List<MyHibernateClass> result = query.list();// executes in 7000ms When logging the sql being executed in MySQL I see select myhibernat0_.myFirstColumn as myfirstcolumn92_, myhibernat0_.mySecondColumn as mysecondcolumn92_, myhibernat0_.mythirdcolumn as mythirdcolumn92_, myhibernat0_.myFourthColumn as myfourthcolumn92_ from MyHibernateClass myhibernat0_ where (1=1); When measurering the java