语境
我想使用 ManagedScheduledExecutorService
安排重复的后台任务.我得到了我的 Runnable
s/Callable
通过 Instance
,所以我的任务中有可用的注入(inject)功能。
我的应用程序在 TomEE 7.0.0-SNAPSHOT webprofile
上运行.
问题
由于这些任务正在访问数据库,因此它们需要一个事务。然而,在Runnable
/Callable
没有交易处于事件状态。
用户交易
documentation for ManagedScheduledExecutorService指出
If a transaction is required, use a javax.transaction.UserTransaction instance. A UserTransaction instance is available (...) by requesting an injection of a UserTransaction object using the Resource annotation.
然而,注入(inject)
@Resource
private UserTransaction userTransaction;
是
null
调用任务时。无状态bean
我采用的另一种方法是将无状态 EJB 注入(inject)我的任务中,希望这会为我创建一个事务。
这导致启动时出现以下异常:
SEVERE: CDI Beans module deployment failed
java.lang.IllegalStateException: no interface to proxy for ejb StatelessEjb, is this is a MDB maybe you shouldn't use a scope?
at org.apache.openejb.cdi.CdiEjbBean.createEjb(CdiEjbBean.java:252)
at org.apache.openejb.cdi.CdiPlugin.getSessionBeanProxy(CdiPlugin.java:224)
at org.apache.webbeans.container.BeanManagerImpl.getEjbOrJmsProxyReference(BeanManagerImpl.java:951)
at org.apache.webbeans.container.BeanManagerImpl.getReference(BeanManagerImpl.java:777)
at org.apache.webbeans.container.BeanManagerImpl.getInjectableReference(BeanManagerImpl.java:651)
at org.apache.webbeans.inject.AbstractInjectable.inject(AbstractInjectable.java:111)
at org.apache.webbeans.inject.InjectableConstructor.createParameters(InjectableConstructor.java:109)
at org.apache.webbeans.inject.InjectableConstructor.doInjection(InjectableConstructor.java:72)
at org.apache.webbeans.portable.InjectionTargetImpl.newInstance(InjectionTargetImpl.java:190)
at org.apache.webbeans.portable.InjectionTargetImpl.produce(InjectionTargetImpl.java:173)
at org.apache.webbeans.portable.AbstractProducer.produce(AbstractProducer.java:172)
at org.apache.webbeans.component.AbstractOwbBean.create(AbstractOwbBean.java:127)
at org.apache.webbeans.component.ManagedBean.create(ManagedBean.java:67)
at org.apache.webbeans.context.DependentContext.getInstance(DependentContext.java:68)
at org.apache.webbeans.context.AbstractContext.get(AbstractContext.java:124)
at org.apache.webbeans.container.BeanManagerImpl.getReference(BeanManagerImpl.java:785)
at org.apache.webbeans.inject.instance.InstanceImpl.create(InstanceImpl.java:306)
at org.apache.webbeans.inject.instance.InstanceImpl.get(InstanceImpl.java:123)
(...)
测试用例
我创建了一个小的 test case project on Github .它包含两个分支,说明了上述问题。
问题
@Stateless
EJB 工作正常,因为所有实例都是使用注入(inject)获得的? @Resource
为UserTransaction
注入(inject)失败? 最佳答案
使用 CDI 获取它应该修复它:
@Inject
private UserTransaction userTransaction;
编辑:@Resource 案例的问题已修复:https://issues.apache.org/jira/browse/TOMEE-1672
关于jakarta-ee - TomEE 7.0.0 上 ManagedScheduledExecutorService 任务中的事务?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/34024242/