侦听器未收到 ApplicationPreparedEvent

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问题描述

我有一个 Spring Boot 1.5.4 应用程序，它在启动时注册一个日志附加程序，多亏了一个监听器，它适用于这里解释的解决方案在 spring boot starter 中注册自定义日志 appender .侦听器是我编写的 starter 的一部分，我的带有 @EnableAutoConfiguration 的应用程序按预期工作.

I have a Spring Boot 1.5.4 app that registers a log appender at startup, thanks to a listener, and it works with the solution explained here register custom log appender in spring boot starter . The listener is part of a starter that I have written, and my app with @EnableAutoConfiguration works as expected.

我有 2 个其他应用程序使用相同的 Spring Boot 版本，我想使用相同的启动器.我相信它们与工作应用程序或多或少具有相同的配置，但是 onApplicationEvent 方法永远不会被调用，因此我的日志附加程序没有注册.下面是我的配置+监听器类.

I have 2 other applications using the same Spring Boot version for which I would like to use the same starter. I believe they have more or less the same config as the working application, but the onApplicationEvent method never gets called and therefore my log appender isn’t registered. Below is my configuration + listener class .

我在 supportsEventType 方法中放置了一个断点，并且对于传递到那里的所有事件，没有一个像在我的第一个应用程序中那样属于 ApplicationPreparedEvent 类型.

I have put a breakpoint in supportsEventType method and for all the events that get passed there, none is of type ApplicationPreparedEvent like in my first app.

@Configuration
@EnableConfigurationProperties(MetricProperties.class)
@EnableAspectJAutoProxy(proxyTargetClass = true)
public class MetricsAutoConfiguration implements GenericApplicationListener {

private final MetricProperties metricProperties;
private boolean addedCustomAppender = false;

public MetricsAutoConfiguration(MetricProperties metricProperties) {
    this.metricProperties = metricProperties;
}


@Bean
@ConditionalOnProperty(name = "metrics.enabled", havingValue = "true")
public EventsPublisher metricPublisher() {
    metricProperties.validate();
    return new EventsPublisher(metricProperties);
}



@Override

public void onApplicationEvent(ApplicationEvent event) {
    if (metricProperties.isEnabled() && !addedCustomAppender) {

        ApplicationPreparedEvent applicationEvent = (ApplicationPreparedEvent) event;
        EventsPublisher eventPublisher = applicationEvent.getApplicationContext().getBean(EventsPublisher.class);

    //register the log appender
    // removed for brevity

        addedCustomAppender = true;
    }
}


@Override
public int getOrder() {
    // this must be higher than LoggingApplicationListener.DEFAULT_ORDER
    return Ordered.HIGHEST_PRECEDENCE + 21;
}

@Override
public boolean supportsEventType(ResolvableType eventType) {

    return  ApplicationPreparedEvent.class.isAssignableFrom(eventType.getRawClass());
}

@Override
public boolean supportsSourceType(Class<?> sourceType) {
    return true;
}

}

在它适用的应用程序中，我看到构建了 3 个 ApplicationPreparedEvent，并且 supportsEventsType 返回 true 两次(并且 onApplicationEvent 被调用两次，使用相同的事件):这发生在第 3 个 ApplicationPreparedEvent 构建之后，而不是之前.

In the application for which it works, I see that 3 ApplicationPreparedEvent are built, and supportsEventsType returns true twice (and onApplicationEvent is called twice, with the same event) : this happens after the 3rd ApplicationPreparedEvent is built, not before.

应用注释是:

@SpringBootApplication
@EnableZuulProxy
@EnableBinding(OutPutChannel.class)
@EnableAutoConfiguration(exclude = MetricsDropwizardAutoConfiguration.class)
@IntegrationComponentScan

对于它不工作的其他应用程序，我观察到只有 1 个 ApplicationPreparedEvent 在启动时被构建并且它不会触发监听器，因为 supportsEventsType 被调用但从不返回 true :

For the other applications for which it doesn’t work, I observe that only 1 ApplicationPreparedEvent is built at startup and it doesn’t trigger the listener, because supportsEventsType is called but never returns true :

对于第一个应用程序，它被连续调用:

For the first app, it’s called successively by :

org.springframework.boot.builder.ParentContextApplicationContextInitializer$ParentContextAvailableEvent(两次)
org.springframework.context.event.ContextRefreshedEvent(两次)
org.springframework.boot.context.event.ApplicationReadyEvent(两次)

应用注释是:

@SpringBootApplication
@EnableAutoConfiguration(exclude = {DataSourceAutoConfiguration.class,
    DataSourceTransactionManagerAutoConfiguration.class,
    HibernateJpaAutoConfiguration.class,
    MetricsDropwizardAutoConfiguration.class,
    JestAutoConfiguration.class})

对于第二个应用程序:
- org.springframework.context.event.ContextRefreshedEvent(两次)
- org.springframework.boot.context.embedded.EmbeddedServletContainerInitializedEvent(两次)
- org.springframework.boot.context.event.ApplicationReadyEvent(两次)

ApplicationPreparedEvent

侦听器未收到 ApplicationPreparedEvent

问题描述

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