[英]Spring Hibernate LazyInitializationException on @Transactional
I have a service that runs async task at startup that runs recursively:我有一个在启动时运行异步任务的服务,它以递归方式运行:
@Service
public class TaskService {
private final TaskRepository taskRepository;
@Inject
public TaskService(TaskRepository taskRepository) {
this.taskRepository= taskRepository;
}
private final int currentTaskId = -1;
@Transactional
@PostConstruct
private void init() {
taskRepository.findByClosedDateIsNull().forEach(taskRepository::delete);
runTask();
}
@Async
@Transactional
private void runTask() {
if (!getCurrent().isPresent()) {
Task task = new Task();
//set props
currentTaskId = taskRepository.save(task).getId();
}
Util.sleep(5000); //wrapper for simple Thread.sleep(long l).
Task task = getCurrent().get();
if (task.getEvents().size > 0) {
//bussiness logic
Util.sleep(1000);
}
runTask();
}
@Transactional(readOnly = true)
private Optional<Task> getCurrent() {
return taskRepository.findOneById(currentTaskId).map(task -> {
task.getEvents().size(); //throws the error here
return task;
});
}
}
StackTrace:堆栈跟踪:
Caused by: org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.test.domain.Task.events, could not initialize proxy - no Session at org.hibernate.collection.internal.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:576) at org.hibernate.collection.internal.AbstractPersistentCollection.withTemporarySessionIfNeeded(AbstractPersistentCollection.java:215) at org.hibernate.collection.internal.AbstractPersistentCollection.readSize(AbstractPersistentCollection.java:156) at org.hibernate.collection.internal.PersistentSet.size(PersistentSet.java:160) at com.test.service.TaskService.lambda$getCurrent$5(TaskService.java:135) at java.util.Optional.map(Optional.java:215) at com.test.service.TaskService.getCurrent(TaskService.java:134) at com.test.service.TaskService.runTask(TaskService.java:163) at com.test.service.TaskService.init(TaskService.java:66) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Me
引起:org.hibernate.LazyInitializationException:未能延迟初始化角色集合:com.test.domain.Task.events,无法初始化代理 - 在 org.hibernate.collection.internal.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection. java:576) at org.hibernate.collection.internal.AbstractPersistentCollection.withTemporarySessionIfNeeded(AbstractPersistentCollection.java:215) at org.hibernate.collection.internal.AbstractPersistentCollection.readSize(AbstractPersistent:15.orginternal.java:215) .PersistentSet.size(PersistentSet.java:160) at com.test.service.TaskService.lambda$getCurrent$5(TaskService.java:135) at java.util.Optional.map(Optional.java:215) at com.test .service.TaskService.getCurrent(TaskService.java:134) at com.test.service.TaskService.runTask(TaskService.java:163) at com.test.service.TaskService.init(TaskService.java:66) at sun。 reflect.NativeMethodAccessorImpl.invoke0(Native Me thod) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:365) at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeInitMethods(InitDestroyAnnotationBeanPostProcessor.java:310) at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:133) ... 21 common frames omitted
thod) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:365) at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetaProcessdata.Initjava. beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:133) ...省略了21个常用帧
I also tried Hibernate.initialize(Object proxy);.我也试过 Hibernate.initialize(Object proxy);。 OpenViewSessionFilter is not the solution for me.
OpenViewSessionFilter 不是我的解决方案。 I don't want to set this collection EAGER.
我不想设置这个集合 EAGER。
I found a solution (don't know if it's a bad practice, but it works for me).我找到了一个解决方案(不知道这是否是一种不好的做法,但它对我有用)。 Just create a default method in your JpaRepository and annotate it with @Transactional.
只需在您的 JpaRepository 中创建一个默认方法并使用 @Transactional 对其进行注释。 In the service call this method.
在服务中调用这个方法。
对我来说,当我在第一个函数调用中删除@Transactional
(在您的情况下这将是init()
)并将@Async
功能移动到一个单独的 bean 时,它解决了这个问题。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.