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From "David Johle (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LOG4J2-166) Routing appender Route definitions cause creation failure
Date Thu, 14 Feb 2013 19:25:12 GMT
David Johle created LOG4J2-166:

             Summary: Routing appender Route definitions cause creation failure
                 Key: LOG4J2-166
                 URL: https://issues.apache.org/jira/browse/LOG4J2-166
             Project: Log4j 2
          Issue Type: Bug
          Components: Core
    Affects Versions: 2.0-beta4
            Reporter: David Johle

I recently updated to using beta4 and ran into a problem upon startup where I received numerous
errors such as this:
2013-02-14 12:27:40,139 ERROR No Appender was configured for route null

Everything was working great up though beta3.  After tracing it back, I think I found that
it relates to the change Ralph alluded to above...
"The problem was that the code was treating the Appender being created under the default Route
as the default. That is incorrect. The code has been modified to just keep track of the default

I think my setup was relying on that incorrect behavior, and that it's somewhat similar to
what William is trying to accomplish.

I have several appenders created, and a routing appender to map events to them.  I also have
a catch-all appender where I want all non-matched events to be sent.  The [abbreviated] configuration
is like this:


    <RollingFile name="apples" fileName="logs/apples" filePattern="logs/apples.%d{yyyy-MM-dd}">
      <PatternLayout pattern="${commonLayout}"/>
        <TimeBasedTriggeringPolicy interval="1" modulate="true"/>

    <RollingFile name="oranges" fileName="logs/oranges" filePattern="logs/oranges.%d{yyyy-MM-dd}">
      <PatternLayout pattern="${commonLayout}"/>
        <TimeBasedTriggeringPolicy interval="1" modulate="true"/>

    <RollingFile name="other" fileName="logs/notmatched" filePattern="logs/notmatched.%d{yyyy-MM-dd}">
      <PatternLayout pattern="${commonLayout}"/>
        <TimeBasedTriggeringPolicy interval="1" modulate="true"/>

    <Routing name="Routing">
      <Routes pattern="$${ctx:fruit}">
        <Route key="apples" ref="apples"/>
        <Route key="oranges" ref="oranges"/>
        <Route ref="other"/>


So the idea is that anything which has a ctx:fruit value of apples/oranges goes into the specific
files, any everything else (regardless of ctx:fruit being defined or not) going into the "other"

At startup time, most (if not all) events fall into the case of not having ctx:fruit defined
at all.  And during my debugging, I saw that "...the replacement won't occur if the context
value isn't present.." as William mentioned:

In RoutingAppender.java on line 107 there is:
   final String key = config.getSubst().replace(event, routes.getPattern());

The value that ends up being assigned is the literal string "${ctx:fruit}" instead of null.
 As a result, it chooses the default Route entry of "other" which hasn't been created yet,
so it proceeds to create that appender.  So far so good, until...

The code 

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