Trying to initialize logback with custom configuration file (logback.xml) running on GAE platform throws the following exception

Failed to instantiate [ch.qos.logback.classic.LoggerContext]
Reported exception:
java.lang.NoClassDefFoundError: java.net.InetAddress is a restricted class. Please see the Google App Engine developer's guide for more details.
at com.google.appengine.tools.development.agent.runtime.Runtime.reject(Runtime.java:51)
at ch.qos.logback.core.util.ContextUtil.getLocalHostName(ContextUtil.java:30)
at ch.qos.logback.core.util.ContextUtil.addHostNameAsProperty(ContextUtil.java:39)
at ch.qos.logback.classic.joran.action.ConfigurationAction.begin(ConfigurationAction.java:47)
at ch.qos.logback.core.joran.spi.Interpreter.callBeginAction(Interpreter.java:273)
at ch.qos.logback.core.joran.spi.Interpreter.startElement(Interpreter.java:145)
at ch.qos.logback.core.joran.spi.Interpreter.startElement(Interpreter.java:127)
at ch.qos.logback.core.joran.spi.EventPlayer.play(EventPlayer.java:40)
at ch.qos.logback.core.joran.spi.Interpreter.play(Interpreter.java:332)
at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:126)
at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:93)
at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:52)
at ch.qos.logback.classic.util.ContextInitializer.configureByResource(ContextInitializer.java:77)
at ch.qos.logback.classic.util.ContextInitializer.autoConfig(ContextInitializer.java:150)
at org.slf4j.impl.StaticLoggerBinder.init(StaticLoggerBinder.java:85)
at org.slf4j.impl.StaticLoggerBinder.<clinit>(StaticLoggerBinder.java:55)
at org.slf4j.LoggerFactory.bind(LoggerFactory.java:121)
at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:111)
at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:268)
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:241)
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:254)
......

This happens because ch.qos.logback.core.util.ContextUtil.java contains are reference to a java.net.InetAddress which is a restricted class on Google AppEngine Platform SDK 1.3.7:

static String getLocalHostName() throws UnknownHostException

{ InetAddress localhost = InetAddress.getLocalHost(); return localhost.getHostName(); }

I should note that BasicConfigurator is working and is able to configure the logback subsystem.

A couple of resolutions I can think of:

1. Don't export this parameter by default, instead let the user choose if to define it or not in the logback.xml configuration file.
2. Create a "GAEConfigurator" which will use default for the limited GAE environment.
2. Provide a custom build for GAE platform, where this parameter will be taken from http://code.google.com/appengine/docs/java/javadoc/com/google/appengine/api/utils/SystemProperty.html#applicationId or not be defined at all.
4. Provide some method to override / use a different implementation of ContextUtil, one which will be suitable for GAE.