Question

I am using hibernate 3.3 with spring 3.0.5 and using JPA transaction manager. My scenario is a ui page invoking two get methods on service layer to render two regions in UI, Requests are parallel ajax requests. The get methods in service layer return two separate lists of same entity.

List<Car> getCarsA();
List<Car> getCarsB();

我配置了JPA交易经理如下:

<tx:method name="get*" read-only="true" propagation="REQUIRED"/>

Problem : when the hibernate/JPA calls flush after each service method is over, there is potentially some collection (via many-to-many mappings) which is shared between the two lists returned by the methods and hence the exception. I am also using OpenEntityManagerInViewFilter. I do not run into this error if I call the methods serially.

Answer 1

休眠会话对象不使用线索安全。您要么必须使用每个线索自己的会话实例, 要么您必须同步访问会话实例, 与 java 同步 块同步。

在网络环境中,您应该每浏览器会话至少使用一个冬眠会话。同一浏览器会话的访问可以是 同步化 ,也可以使用不止一个会话(当您同时获取不同区域的 UI 时,我会与 同步化 同步化同步,除非一个查询需要相当长的时间,其他查询不应等待) 。

注意:某届会议的最新情况在其他届会中无法直接看到(就本案而言,在另一届会中已经暗藏)。

友情链接