org.hibernate.LazyInitializationException在Quartz作业中 [英] org.hibernate.LazyInitializationException in a Quartz job

问题描述

我可以在我的 Quartz 作业的域类中使用动态查找器，但获取 org.hibernate.LazyInitializationException 当访问关系时。我认为他们要么都工作，要么两者都不工作。

  class MyJob {
 def author = Author.list（） .first（）//罚款
 def book = Book.get（1）//罚款
 println author.books //懒惰异常
} 
  

任何想法为什么会发生这种情况？根据Quartz插件文档，每个作业线程都会获得Hibernate会话，但我遇到了这个问题。

Grails 2.1.1 ， quartz：1.0-RC9

完整错误：

  2013-07-16 16：08：10,008 [quartzScheduler_Worker-10]错误grails.plugins.quartz.listeners.ExceptionPrinterJobListener  - 作业中发生异常：null 
 org.quartz.JobExecutionException：org.hibernate.LazyInitializationException：无法懒惰地初始化角色集合：test.Author.books，没有会话或会话已关闭[请参阅嵌套异常：org.hibernate.LazyInitializationException：未能延迟初始化一个角色集合：test.Author.books，没有会话或会话已关闭] $ grails.plugins.quartz.GrailsJobFactory 
 $ GrailsJob.execute（GrailsJobFactory.java:96）
 at grails.plugins。 quartz.QuartzDisplayJob.execute（QuartzDisplayJob.groovy：29）
 at org.quartz.core.JobRunShell.run（JobRunShell.ja va：213）
在org.quartz.simpl.SimpleThreadPool $ WorkerThread.run（SimpleThreadPool.java:557）
导致：org.hibernate.LazyInitializationException：无法懒惰地初始化一个角色集合：test .Author.books，没有会话或会话已关闭
 at test.MyJob $ _execute_closure1 $$ EOBjSWum.doCall（MyJob.groovy：7）
 at test.MyJob $$ EOBjSWum.execute（MyJob.groovy ：7）
 at grails.plugins.quartz.GrailsJobFactory $ GrailsJob.execute（GrailsJobFactory.java:89）
 ... 3 more 
  

解决方案

MyJob 不是一个grails artefact，因此默认情况下不是事务性的。

解决方案： -

请关注@ Alidad的评论。

  class MyJob {
 def author = Author.list（）。first（）
 def book = Book.get（1）
 Book.withTransaction {
 // withSession也可以使用。您也可以使用Autor.withTransaction。 
 //实体引用不重要。 
 println author.books 
} 
} 
  

I can use dynamic finders on my domain classes in my Quartz job, but get org.hibernate.LazyInitializationException when accessing relationships. I thought they would either both work, or none.

class MyJob {
    def author = Author.list().first() // fine
    def book = Book.get(1) // fine
    println author.books // lazy exception
}

Any idea why this might be happening? According to the Quartz plugin documentation each job thread gets a Hibernate session, yet I'm running into this problem.

Grails 2.1.1, quartz:1.0-RC9

Full Error:

2013-07-16 16:08:10,008 [quartzScheduler_Worker-10] ERROR grails.plugins.quartz.listeners.ExceptionPrinterJobListener  - Exception occurred in job: null
org.quartz.JobExecutionException: org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: test.Author.books, no session or session was closed [See nested exception: org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: test.Author.books, no session or session was closed]
    at grails.plugins.quartz.GrailsJobFactory$GrailsJob.execute(GrailsJobFactory.java:96)
    at grails.plugins.quartz.QuartzDisplayJob.execute(QuartzDisplayJob.groovy:29)
    at org.quartz.core.JobRunShell.run(JobRunShell.java:213)
    at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:557)
Caused by: org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: test.Author.books, no session or session was closed
    at test.MyJob$_execute_closure1$$EOBjSWum.doCall(MyJob.groovy:7)
    at test.MyJob$$EOBjSWum.execute(MyJob.groovy:7)
    at grails.plugins.quartz.GrailsJobFactory$GrailsJob.execute(GrailsJobFactory.java:89)
    ... 3 more

解决方案

MyJob is not a grails artefact, hence not transactional by default. Associations which will be fetched lazily has to be under transactional boundary.

Solution:-
Follow @Alidad's comment.

class MyJob {
    def author = Author.list().first()
    def book = Book.get(1)
    Book.withTransaction{
        //withSession can also be used. You can also use Autor.withTransaction. 
        //The entity reference is immaterial.
        println author.books
    }
}

这篇关于org.hibernate.LazyInitializationException在Quartz作业中的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！