configure log4j properly (app-engine)

[Michael Greifeneder]

Starting reload monitor thread.
     [java] log4j:ERROR Error initializing log4j: java.io.FileOutputStream is a restricted class. Please see the Google App Engine developer's guide for more details.
     [java] java.lang.NoClassDefFoundError: java.io.FileOutputStream is a restricted class. Please see the Google App Engine developer's guide for more details.
     [java] at com.google.appengine.tools.development.agent.runtime.Runtime.reject(Runtime.java:51)
     [java] at org.apache.log4j.FileAppender.setFile(FileAppender.java:290)
     [java] at org.apache.log4j.FileAppender.activateOptions(FileAppender.java:164)
     [java] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     [java] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     [java] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     [java] at java.lang.reflect.Method.invoke(Method.java:597)
     [java] at com.google.appengine.tools.development.agent.runtime.Runtime.invoke(Runtime.java:100)
     [java] at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite$PojoCachedMethodSiteNoUnwrapNoCoerce.invoke(PojoMetaMethodSite.java:229)
     [java] at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite.call(PojoMetaMethodSite.java:52)
     [java] at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:40)
     [java] at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:117)
     [java] at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:121)
     [java] at org.codehaus.groovy.grails.plugins.logging.Log4jConfig.createFullstackTraceAppender(Log4jConfig.groovy:159)
     [java] at org.codehaus.groovy.grails.plugins.logging.Log4jConfig.this$2$createFullstackTraceAppender(Log4jConfig.groovy)
     [java] at org.codehaus.groovy.grails.plugins.logging.Log4jConfig$this$2$createFullstackTraceAppender.callCurrent(Unknown Source)
     [java] at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallCurrent(CallSiteArray.java:44)
     [java] at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:143)
     [java] at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:147)
     [java] at org.codehaus.groovy.grails.plugins.logging.Log4jConfig.configure(Log4jConfig.groovy:134)
     [java] at org.codehaus.groovy.grails.web.util.Log4jConfigListener.contextInitialized(Log4jConfigListener.java:63)
     [java] at org.mortbay.jetty.handler.ContextHandler.startContext(ContextHandler.java:530)
     [java] at org.mortbay.jetty.servlet.Context.startContext(Context.java:135)
     [java] at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1218)
     [java] at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:500)
     [java] at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:448)
     [java] at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:40)
     [java] at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:117)
     [java] at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:40)
     [java] at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:117)
     [java] at org.mortbay.jetty.Server.doStart(Server.java:217)
     [java] at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:40)
     [java] at com.google.appengine.tools.development.JettyContainerService.startContainer(JettyContainerService.java:181)
     [java] at com.google.appengine.tools.development.AbstractContainerService.startup(AbstractContainerService.java:116)
     [java] at com.google.appengine.tools.development.DevAppServerImpl.start(DevAppServerImpl.java:217)
     [java] at com.google.appengine.tools.development.DevAppServerMain$StartAction.apply(DevAppServerMain.java:162)
     [java] at com.google.appengine.tools.util.Parser$ParseResult.applyArgs(Parser.java:48)
     [java] at com.google.appengine.tools.development.DevAppServerMain.<init>(DevAppServerMain.java:113)
     [java] at com.google.appengine.tools.development.DevAppServerMain.main(DevAppServerMain.java:89)

[Florian Motlik (flomotlik)]

Known bug that should be resolved with next Grails AppEngine release. Stays open till then