Wildfly初始化:时间延迟导致Java EE应用程序中出现IllegalStateException

Question

我有一个简单的java项目，它正在获取和计算名为CalculatorService的数据。它通过构建路径包含在部署在野生服务器上的JavaEE应用程序中。

当我运行wildfly服务器时，将构建数据库及其表。之后运行InitializationBean，其中通过所谓的CalculatorService获取一些数据。之后，数据将被存储在数据库中。让我们来看看JavaEE应用程序的InitializationBean。

@Singleton
@Startup
public class InitializationBean {
@Inject
private InitService initService;
@PostConstruct
private void initialize() {
// Start CalculatorService and fetch data.
CalculatorService calcService = new CalculatorService();
calcService.fetchData();
System.out.println("DONE <===========");
initService.storeData();
}
}

InitService看起来像：

@Singleton
public class InitService {
@EJB
private DataDAO dataDAO;
public void storeData() {
// Get fetched data stored within CalculatorService.
Set <DataCalc> dataSet = CalculatorService.getAllData();
// Loop through fetched data of CalculatorService and transform to valid entity.
for (DataCalc d : dataSet) {
Data data = new Data();
data.setName(d.getName());
try { // Store in database
dataDAO.create(data);
} catch (Exception e) { e.printStackTrace(); }
}
}
}

如果我使用测试数据而不是CalculatorService运行上面设置的服务器，一切都会正常工作。但一旦我使用该服务，我就会得到以下输出：

DONE <===========
ERROR [org.jboss.msc.service.fail] (ServerService Thread Pool -- 88) MSC000001: Failed to start service jboss.deployment.subunit."MyProject.ear"."MyProject.jar".component.InitializationBean.START: org.jboss.msc.service.StartException in service jboss.deployment.subunit."MyProject.ear"."MyProject.jar".component.InitializationBean.START: java.lang.IllegalStateException: WFLYEE0042: Failed to construct component instance
at [e-mail]//org.jboss.as.ee.component.ComponentStartService$1.run(ComponentStartService.java:57)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:514)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at [e-mail]//org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35)
at [e-mail]//org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1985)
at [e-mail]//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1487)
at [e-mail]//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1378)
at java.base/java.lang.Thread.run(Thread.java:844)
at [e-mail]//org.jboss.threads.JBossThread.run(JBossThread.java:485)
Caused by: java.lang.IllegalStateException: WFLYEE0042: Failed to construct component instance
at [e-mail]//org.jboss.as.ee.component.BasicComponent.constructComponentInstance(BasicComponent.java:163)
at [e-mail]//org.jboss.as.ee.component.BasicComponent.constructComponentInstance(BasicComponent.java:134)
at [e-mail]//org.jboss.as.ee.component.BasicComponent.createInstance(BasicComponent.java:88)
at [e-mail]//org.jboss.as.ejb3.component.singleton.SingletonComponent.getComponentInstance(SingletonComponent.java:127)
at [e-mail]//org.jboss.as.ejb3.component.singleton.SingletonComponent.start(SingletonComponent.java:141)
at [e-mail]//org.jboss.as.ee.component.ComponentStartService$1.run(ComponentStartService.java:54)
... 8 more
Caused by: java.lang.IllegalStateException
at [e-mail]//org.jboss.msc.value.InjectedValue.getValue(InjectedValue.java:50)
at [e-mail]//org.jboss.as.ejb3.deployment.ModuleDeployment$ModuleDeploymentStartService$1.run(ModuleDeployment.java:102)
at [e-mail]//org.jboss.as.ee.component.deployers.StartupCountdown.countDown(StartupCountdown.java:27)
at [e-mail]//org.jboss.as.ejb3.component.singleton.StartupCountDownInterceptor.processInvocation(StartupCountDownInterceptor.java:28)
at [e-mail]//org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
at [e-mail]//org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:53)
at [e-mail]//org.jboss.as.ee.component.BasicComponent.constructComponentInstance(BasicComponent.java:161)
... 13 more

因为CalculatorService的处理时间很长(超过两个小时(，我认为它与时间有关。但由于没有什么比TimeoutException更好的了，我不知道从哪里开始。

更新

当CalculatorService只需要从数据中提取一小部分(只需几秒钟(时，不会引发异常，数据也会成功存储。

Answer 1

向storeData()方法添加@javax.ejb.Asynchronous注释：

...
@Asynchronous
public void storeData() {
...

这将允许您的应用程序在storeData()在后台线程中正常启动。

您可能还想将CalculatorService调用移到该方法中。。。