Spring监听器配置

使用spring框架时如果同时使用org.springframework.web.util.Log4jConfigListener监听器，那么在web.xml中的监听器的注册顺序为org.springframework.web.context.ContextLoaderListener在后，org.springframework.web.util.Log4jConfigListener在前，否则就回出现如下警告：

log4j:WARN No appenders could be found for logger (org.springframework.web.context.ContextLoader).
log4j:WARN Please initialize the log4j system properly.

我们在spring的api文档中可以看到下面一段说明：

Bootstrap listener to start up Spring's root WebApplicationContext. Simply delegates to ContextLoader.

This listener should be registered after Log4jConfigListener in web.xml, if the latter is used.

 

正确配置如下：

<listener>
    <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
</listener>
<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>