Weld的创业课程

问题描述

我正在尝试使用@Singleton和@Startup注释（在tomcat 7上运行）在Weld CDI中为我的应用程序定义一个启动类，但我的PostConstruct方法永远不会被调用。

I am trying to define a startup class for my application in Weld CDI with @Singleton and @Startup annotations (running on tomcat 7), but my PostConstruct method is never called.

这是我的Startup类：

Here is my Startup class:

import java.util.List;
import java.util.logging.Logger;

import javax.annotation.PostConstruct;
import javax.ejb.Startup;
import javax.inject.Inject;
import javax.ejb.Singleton;
import javax.persistence.EntityManager;

import se.raindance.squid.core.domain.SquidSettings;


@Singleton 
@Startup
public class InitSquid {

  @Inject   
  private Logger log;  

  @Inject
  EntityManager entityManager;

  @PostConstruct
  public void init() {

    System.out.println("startup!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! InitSquid");
    // Init Rainlets
InitRainlets initRainlets = new InitRainlets(entityManager);
    initRainlets.init();

    initSquidSettings();    
  }

  private void initSquidSettings() {
    List<SquidSettings> settingsList = (List<SquidSettings>) entityManager
        .createQuery(
            "select squidsettings from SquidSettings squidsettings")
        .getResultList();

    if (settingsList.size() == 0) {
        log.info("No SquidSettings entity exists in system, creating one");

        SquidSettings settings = new SquidSettings();
        settings.setSubledgerRestResourceURI("http://localhost:8080/subledger-webapp/resteasy/");
        entityManager.persist(settings);
    }
  }

}

我试过我在这两个帖子中找到的提示
和但没有帮助

I tried the hints which I found in these two postsStartup POJO with WELD and Startup EJB doesn't work but neither helped

推荐答案

您不能在CDI bean上使用@Startup或@ javax.ejb.Singleton注释：这些注释适用于EJB。并且EJB不适用于（普通）Tomcat。如果要在Tomcat上运行EE应用程序，请查看项目。

You can not use the @Startup or @javax.ejb.Singleton annotations on a CDI bean: those annotations are meant for EJB's. And EJB's won't work on (plain) Tomcat. If you want to run an EE application on Tomcat, take a look at the TomEE project.

但是，有一个事件。您可以编写一个观察者方法来处理该事件，如此博客文章所示：

However, there's an AfterDeploymentValidation event that's thrown after everything has been deployed. You can write an observer method to act on that event, as shown in this blog post here:

• Eager CDI beans

这篇关于Weld的创业课程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！