解决：org.hibernate.LazyInitializationException: failed to lazily initialize(2013-04-28 14:49:47)

原因是在hibernate映射关系中由于延迟加载，session在调用前已经被关闭，，所以加载set属性时无可用session

解决方案：

在 @ManyToOne端设置fetch=FetchType.LAZY,@OneToMany端设置fetch=FetchType.EAGER，如下配置

@ManyToOne(cascade={CascadeType.REFRESH, CascadeType.MERGE}, optional=true, fetch=FetchType.LAZY)
@JoinColumn(name="uim_serv_file_record_id")
private UimServFileRecord uimServFileRecord;

                              

@OneToMany(cascade=CascadeType.ALL,fetch=FetchType.EAGER,mappedBy="uimServFileRecord")
private Set uimServFileDatas=new HashSet();

http://www.cnblogs.com/linjiqin/archive/2011/03/21/1990041.html