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https://issues.apache.org/jira/browse/LOG4J2-3327?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17470760#comment-17470760
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Conor Griffin commented on LOG4J2-3327:
---------------------------------------
OK I see, so using the property as follows loads the classes correctly
{code:java}
packages = com.mycompany.log4jext {code}
That seems like a reasonable workaround. But is the lack of the dat file due
to missing build configuration or is it a feature gap?
> scala: add support for creating custom PatternConverter plugins
> ---------------------------------------------------------------
>
> Key: LOG4J2-3327
> URL: https://issues.apache.org/jira/browse/LOG4J2-3327
> Project: Log4j 2
> Issue Type: Improvement
> Components: Plugins
> Reporter: Conor Griffin
> Assignee: Mikael Ståldal
> Priority: Major
> Labels: scala
>
> I tried to add a custom pattern converter using Scala but the plugin does not
> seem to get picked up or the pattern conversion does not work. Here's my
> sample scala implementation where I am trying to use {{%W}} as the pattern to
> substitute a correlation ID
> {code:java}
> package com.mycompany.log4jext
> import org.apache.logging.log4j.core.LogEvent
> import org.apache.logging.log4j.core.config.plugins.{Plugin, PluginFactory}
> import org.apache.logging.log4j.core.pattern.{ConverterKeys,
> LogEventPatternConverter, PatternConverter}
> import java.lang
> import java.util.UUID
> @Plugin(name = "CustomPatternConverter", category = PatternConverter.CATEGORY)
> @ConverterKeys(Array("W"))
> class CustomPatternConverter(name: String, style: String) extends
> LogEventPatternConverter(name: String, style: String) {
> def this(options:Array[String]) {
> this("CustomPatternConverter", "none")
> }
> override def format(obj: Any, output: lang.StringBuilder): Unit = {
> obj match {
> case l:LogEvent => format(l, output)
> }
> }
> override def format(event: LogEvent, toAppendTo: lang.StringBuilder): Unit
> = {
> Option(CorrelationId.getCorrelationId) match {
> case Some(value) => toAppendTo.append(s"[commonId=$value]")
> }
> }
> }
> object CustomPatternConverter {
> @PluginFactory
> def newInstance(options:Array[String]): CustomPatternConverter = {
> new CustomPatternConverter(options)
> }
> }
> object CorrelationId {
> private val ID = new ThreadLocal[String]()
> def clearCorrelationId(): Unit = {
> ID.remove()
> }
> def setCorrelationId(id: String): Unit = setCorrelationId(Option(id))
> def setCorrelationId(maybeId: Option[String]): Unit = {
> maybeId foreach { ID.set }
> }
> def getCorrelationId: String = ID.get()
> def generateCorrelationId: String = s"MyApp|${UUID.randomUUID().toString}"
> }{code}
> I have enabled debug with {{log4j2.debug=true}} and see debug logs but don't
> see evidence that the pattern converter is loaded. I also don't see the
> correlation ID logged however this used to be logged under log4j1.
> Is there special configuration needed to get log4j2 to load plugins written
> in scala? Or is there an error in how I've written the code above?
> I also tried without the {{@PluginFactory}} annotation without success.
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