杰克逊与双向一对多关系混淆：未能懒惰地初始化收藏

Backend Spring MVC and Spring-data,spring-security . Front end Angularjs.I'm using spring 3.1 ;Jackson 1.8 ; JPa 2.1 ands mysql.The basic problem is the same as asked multiple time. I have a simple program with two POJOs sites and typeSite- where a typeSite can have multiple Sites. But I'm getting the following error :Backend Spring MVC and Spring-data,spring-secur