问题

I'm trying to find the correct way to execute some startup code which reads and uses tomcat's context.xml when running micronaut as a servlet.

我正在尝试找到在将Micronaut作为Servlet运行时执行启动代码以读取和使用Tomcat的context.xml的正确方法。

I've tried creating a @Singleton that implements ApplicationEventListener<ServerStartupEvent> but that doesn't seem to get executed when my micronaut code is compiled and deployed as a war file servlet in tomcat.

我尝试创建一个@Singleton，实现ApplicationEventListener<ServerStartupEvent>，但当我将我的Micronaut代码编译并部署为Tomcat中的WAR文件Servlet时，似乎不会执行该代码。

Changing the @Singleton to a @Context annotation didn't help either.

将@Singleton 更改为@Context 注释也没有帮助。

The docs say that MicronautServletInitializer will register a new DefaultMicronautServlet but it doesn't look that DefaultMicronautServlet is a bean that you can @Replace, it just hardcodes it in there.

文档中表示MicronautServletInitializer将注册一个新的DefaultMicronautServlet，但似乎DefaultMicronautServlet不是您可以用@Replace替换的bean，它只是硬编码在那里。

Is there something special needed to get Application Events to trigger?

需要特殊的东西来触发应用程序事件吗？

EDIT this also doesn't work:

编辑 这也不起作用：

package com.mypackage.api;

import io.micronaut.context.event.ApplicationEventListener;
import io.micronaut.context.event.StartupEvent;
importakarta.inject.Singleton;

@Singleton
//@Context // Doesn't execute with or without
public class SystemUtilsConfig implements ApplicationEventListener<StartupEvent>
{
    @Override
    //@EventListener // Doesn't execute with or without
    //@Async // Doesn't execute with or without
    public void onApplicationEvent(StartupEvent startupEvent)
    {
        System.out.println("=====SystemUtilsConfig.onApplicationEvent=====");
    }
}

package com.mypackage.api;

import io.micronaut.context.event.ApplicationEventListener;
import io.micronaut.context.event.StartupEvent;
import jakarta.inject.Singleton;


@Singleton
//@Context // Doesn't execute with or without
public class SystemUtilsConfig implements ApplicationEventListener<StartupEvent>
{
    @Override
    //@EventListener // doesn't execute with or without
    //@Async // doesn't execute with or without
    public void onApplicationEvent(StartupEvent startupEvent)
    {
        System.out.println("=====SystemUtilsConfig.onApplicationEvent======");
    }
}

答案1

得分: 5

ServerStartupEvent 用于嵌入式服务器，当你将 WAR 部署到现有的 Tomcat 实例时，情况就不同了。如果你想在这种情况下在启动时运行代码，请使用 ApplicationEventListener<io.micronaut.context.event.StartupEvent>，它将在应用程序引导完成后执行，无论服务器是正在运行的实例还是嵌入式实例。