I am trying to use a custom layout class for play framework 2.0 logback logging.

First, I defined a custom layout class in package utils:

package utils;

public class MonitorLayoutForLogback extends LayoutBase<ILoggingEvent> {
...
}

In my conf/logging.xml file, I put:

<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <encoder class="ch.qos.logback.core.encoder.LayoutWrappingEncoder">
            <layout class="utils.MonitorLayoutForLogback">
                             <param name="programName" value="uowVisualizer" />
                             <param name="serviceGroup" value="shared" />
                             <param name="serviceIdentifier" value="uowVisualizer" />
            </layout>
        </encoder>
    </appender>

but when I run within play, e.g.,

play run

I see:

14:20:18,387 |-ERROR in ch.qos.logback.core.joran.action.NestedComplexPropertyIA - Could not create component [layout] of type [utils.MonitorLayoutForLogback] java.lang.ClassNotFoundException: utils.M
onitorLayoutForLogback
    at java.lang.ClassNotFoundException: utils.MonitorLayoutForLogback
    at      at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at      at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at      at java.security.AccessController.doPrivileged(Native Method)
    at      at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at      at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
    at      at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
    at      at sbt.PlayCommands$$anonfun$53$$anonfun$55$$anon$2.loadClass(PlayCommands.scala:535)
    at      at ch.qos.logback.core.util.Loader.loadClass(Loader.java:124)
    at      at ch.qos.logback.core.joran.action.NestedComplexPropertyIA.begin(NestedComplexPropert
playframework logback
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