java - 使用 log4j.xml 时出现 log4j 警告消息

Question

我正在尝试将我的 log4j.properties 转换为 log4j.xml，因为我需要使用一些过滤器功能。当我启动应用程序时收到一堆警告，我不确定如何解决它们:

log4j:WARN Continuable parsing error 4 and column 69
log4j:WARN Attribute "threshold" for element type "log4j:configuration" has a default value and must be specified in a standalone document.
log4j:WARN Continuable parsing error 4 and column 69
log4j:WARN Attribute "debug" for element type "log4j:configuration" has a default value and must be specified in a standalone document.
log4j:WARN Continuable parsing error 4 and column 69
log4j:WARN Attribute "reset" for element type "log4j:configuration" has a default value and must be specified in a standalone document.
log4j:WARN Continuable parsing error 20 and column 23
log4j:WARN The content of element type "log4j:configuration" must match "(renderer*,appender*,plugin*,(category|logger)*,root?,(categoryFactory|loggerFactory)?)".
log4j:WARN Unrecognized element param

我也在尝试使用一个非常简单的 log4j.xml 文件:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
    <appender name="A1" class="org.apache.log4j.ConsoleAppender">
        <param name="Threshold" value="INFO"/>
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="%-5p | %d{MM-dd-yyyy HH:mm:ss.SSS} | %t | %c(%L) - %m%n"/>
        </layout>
    </appender>
    <root>
        <priority value="INFO"/>
        <appender-ref ref="A1"/>
    </root>
</log4j:configuration>

我在这里遗漏了什么吗？谢谢!

Answer 1

standalone属性，简单来说就是声明信息集不受文档外任何内容的影响。然而，在这种情况下，情况并非如此，因为属性具有在外部 DTD 中指定的默认值。