Wildfly 初始化：时间延迟导致 Java-EE 应用程序中的 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 Wildfly 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，InitializationBean 正在运行，其中一些数据通过所谓的CalculatorService 获取。之后，数据将存储在数据库中。让我们看看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 运行上述设置的服务器，则一切正常。但是一旦我使用该服务，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 org.jboss.as.ee@14.0.1.Final//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 org.jboss.threads@2.3.2.Final//org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35)
    at org.jboss.threads@2.3.2.Final//org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1985)
    at org.jboss.threads@2.3.2.Final//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1487)
    at org.jboss.threads@2.3.2.Final//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1378)
    at java.base/java.lang.Thread.run(Thread.java:844)
    at org.jboss.threads@2.3.2.Final//org.jboss.threads.JBossThread.run(JBossThread.java:485)
Caused by: java.lang.IllegalStateException: WFLYEE0042: Failed to construct component instance
    at org.jboss.as.ee@14.0.1.Final//org.jboss.as.ee.component.BasicComponent.constructComponentInstance(BasicComponent.java:163)
    at org.jboss.as.ee@14.0.1.Final//org.jboss.as.ee.component.BasicComponent.constructComponentInstance(BasicComponent.java:134)
    at org.jboss.as.ee@14.0.1.Final//org.jboss.as.ee.component.BasicComponent.createInstance(BasicComponent.java:88)
    at org.jboss.as.ejb3@14.0.1.Final//org.jboss.as.ejb3.component.singleton.SingletonComponent.getComponentInstance(SingletonComponent.java:127)
    at org.jboss.as.ejb3@14.0.1.Final//org.jboss.as.ejb3.component.singleton.SingletonComponent.start(SingletonComponent.java:141)
    at org.jboss.as.ee@14.0.1.Final//org.jboss.as.ee.component.ComponentStartService$1.run(ComponentStartService.java:54)
    ... 8 more
Caused by: java.lang.IllegalStateException
    at org.jboss.msc@1.4.3.Final//org.jboss.msc.value.InjectedValue.getValue(InjectedValue.java:50)
    at org.jboss.as.ejb3@14.0.1.Final//org.jboss.as.ejb3.deployment.ModuleDeployment$ModuleDeploymentStartService$1.run(ModuleDeployment.java:102)
    at org.jboss.as.ee@14.0.1.Final//org.jboss.as.ee.component.deployers.StartupCountdown.countDown(StartupCountdown.java:27)
    at org.jboss.as.ejb3@14.0.1.Final//org.jboss.as.ejb3.component.singleton.StartupCountDownInterceptor.processInvocation(StartupCountDownInterceptor.java:28)
    at org.jboss.invocation@1.5.1.Final//org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
    at org.jboss.invocation@1.5.1.Final//org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:53)
    at org.jboss.as.ee@14.0.1.Final//org.jboss.as.ee.component.BasicComponent.constructComponentInstance(BasicComponent.java:161)
    ... 13 more

因为CalculatorService 需要很长时间来处理（超过两个小时），我认为它与时间有关。但由于没有像 TimeoutException 这样的东西，我不知道从哪里开始。

更新

当CalculatorService 需要从数据中提取一小部分时，只需几秒钟就不会引发异常并且数据会成功存储。

Answer 1

在storeData() 方法中添加@javax.ejb.Asynchronous 注释：

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

这将允许您的应用程序在storeData() 在后台线程中执行其操作时正常启动。

您可能还想将 CalculatorService 调用移到该方法中...