在JBoss EAP 6.3.0上的@Singleton中未调用@PreDestroy方法 [英] @PreDestroy method not called in @Singleton on JBoss EAP 6.3.0

问题描述

在我的JavaEE应用程序中，我有一个@Singleton类，其中包含一些@Scheduled方法.此外，还有使用@PostConstruct和@PreDestroy的方法来设置和清理数据库. (为简单起见，我只登录了示例，因为它可以重现该问题.)该应用程序必须在JBoss EAP 6.3.0.GA服务器上运行.

In my JavaEE application, I have a @Singleton class containing some @Scheduled methods. Furthermore there are methods with @PostConstruct and @PreDestroy to set up and clean up the database. (For the sake of simplicity, I just have logging in the example, since that reproduces the problem.) The application has to run on a JBoss EAP 6.3.0.GA server.

虽然@PostConstruct方法可以正常工作，但是当我关闭服务器时(在eclipse中按下 stop the server 按钮时，或者从shutdown命令使用shutdown命令时，都不会调用@PreDestroy jboss-cli).这是一些代码，它重现了这个问题:

While the @PostConstruct method works fine, @PreDestroy is not called when I shutdown the server (neither when pressing the stop the server button in eclipse nor when using a shutdown command from jboss-cli). Here is some code, which reproduces the problem:

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.ejb.Singleton;
import javax.ejb.Startup;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

@Singleton
@Startup
public class TimerBean {

    private static final Logger log = LoggerFactory.getLogger(TimerBean.class);

    @PostConstruct
    private void postConstruct() {
        log.info("PostConstruct called");
    }

    @PreDestroy
    private void preDestroy() {
        log.info("PreDestroy called");
    }
}

在服务器启动期间，@PostConstruct消息出现在日志中.但是当关闭服务器时，没有日志消息出现.

During startup of the server, the @PostConstruct message appears in the log. But when shutting down the server, no log message appears.

如何使服务器调用@PreDestroy方法?

How can I make the server call the @PreDestroy method?

编辑:由于@PreDestroy方法不是清理数据库的适当位置，因此此问题已过时.

EDIT: Since the @PreDestroy method is not the appropriate location to clean up the database, this question is obsolete.

推荐答案

这不是您的问题的答案，这是您在上一条评论中提出的问题的答案. 其实我想不到一个合适的地方去做.其他人可能会帮助您解决这个问题. 但是无论如何，@ PostContruct和@PreDestory可能不是事务的一部分，这就是为什么在这些方法中执行数据库操作不好的原因，

This is not the answer for your question, this is the answer for the question you raised in the last comment. actually i can not think about a right place to do it.someone else might help you to figure it out. but anyway @PostContruct and @PreDestory might not be a part of transaction, that's why it is not good to do DB operations in those methods,

但是，为您的帮助，我附上了我从一本书(精通EJB 3.0)中学到的内容，

But for your help i attach this which i took from a book (Mastering EJB 3.0),

这篇关于在JBoss EAP 6.3.0上的@Singleton中未调用@PreDestroy方法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IT屋！