[LOG4J2-3529] Log4j Custom Layout always use the Attribute value of the last one created.

• Type: Question
• Status: Resolved
• Priority: Major
• Resolution: Not A Problem
• Component/s: Plugins
• Assignee: Unassigned
• Reporter: XIAOMING ZHAO
• Created: 02/Jun/22 14:12
• Updated: 02/Jun/22 21:34
• Resolved: 02/Jun/22 21:33

Description

Hi Log4j Team,

I got one problem, I defined custom layout plugin like the following, and defined Appender to set the layout with different application value in log4j2.xml, but I found it always use the application value of the last Appender instead of different value for different appender.  any problem with my code ? how to resolve this kind of issue?

@Plugin(name = "UnifiedLoggingFormat", category = Node.CATEGORY,
        elementType = Layout.ELEMENT_TYPE, printObject = true)
public class UnifiedLoggingFormat extends AbstractStringLayout
 
    protected UnifiedLoggingFormat(String aInApplication, Charset aInCharset)
    {
        super(aInCharset);
        application = aInApplication;
    }
    @PluginFactory
    public static UnifiedLoggingFormat createLayout(
            @PluginAttribute(value="Application",
                    defaultString = DEFAULT_APPLICATION)
                    String aInApplication,
            @PluginAttribute(value = "charset", defaultString = "UTF-8")
                    Charset aInCharset)
    {
        return new UnifiedLoggingFormat(aInApplication, aInCharset);
     }

log4j2.xml like the following:

 

 

       <RollingFile name="ServerFileAppender"
                     fileName="/opt/tpa/logs/Server.log"
                     filePattern="/opt/tpa/logs/Server/Server.%i.log.gz">
            <UnifiedLoggingFormat/>
            <AddMDCFilter/>
            <Policies>
                <SizeBasedTriggeringPolicy size="30 MB"/>
            </Policies>
            <DefaultRolloverStrategy fileIndex="min" min="1" max="10">
      
            </DefaultRolloverStrategy>
        </RollingFile>
        <Socket name="Socket_ServerFileAppender"
                host="localhost"
                port="8514"
                reconnectionDelayMillis="10000">
            <UnifiedLoggingFormat Application="SERVER"/>
        </Socket>
        <Socket name="Socket_RSArmingFileAppender"
                host="localhost"
                port="8514"
                reconnectionDelayMillis="10000">
            <UnifiedLoggingFormat Application="ARMING"/>
        </Socket>