/ returns HTTP-code 200 but no content (0 byte response), when I check
the logs I get the following stacktrace:

Error for /
java.lang.NoClassDefFoundError: org/codehaus/groovy/antlr/
AntlrParserPlugin
        at
org.codehaus.groovy.antlr.AntlrParserPluginFactory.createParserPlugin
(AntlrParserPluginFactory.java:27)
        at org.codehaus.groovy.control.SourceUnit.parse(SourceUnit.java:247)
        at org.codehaus.groovy.control.CompilationUnit$1.call
(CompilationUnit.java:160)
        at org.codehaus.groovy.control.CompilationUnit.applyToSourceUnits
(CompilationUnit.java:798)
        at org.codehaus.groovy.control.CompilationUnit.compile
(CompilationUnit.java:464)
        at groovy.lang.GroovyClassLoader.parseClass(GroovyClassLoader.java:
278)
        at groovy.lang.GroovyClassLoader.parseClass(GroovyClassLoader.java:
249)
        at groovy.lang.GroovyClassLoader.parseClass(GroovyClassLoader.java:
244)
        at
org.codehaus.groovy.grails.web.pages.GroovyPagesTemplateEngine.compileGroovyPage
(GroovyPagesTemplateEngine.java:462)
        at
org.codehaus.groovy.grails.web.pages.GroovyPagesTemplateEngine.buildPageMetaInfo
(GroovyPagesTemplateEngine.java:427)
        at
org.codehaus.groovy.grails.web.pages.GroovyPagesTemplateEngine.createTemplate
(GroovyPagesTemplateEngine.java:309)
        at
org.codehaus.groovy.grails.web.pages.GroovyPagesTemplateEngine.createTemplateWithResource
(GroovyPagesTemplateEngine.java:293)
        at
org.codehaus.groovy.grails.web.pages.GroovyPagesTemplateEngine.createTemplate
(GroovyPagesTemplateEngine.java:183)
        at
org.codehaus.groovy.grails.web.pages.GroovyPagesTemplateEngine.createTemplate
(GroovyPagesTemplateEngine.java:198)
        at
org.codehaus.groovy.grails.web.servlet.view.GroovyPageView.renderWithTemplateEngine
(GroovyPageView.java:104)
        at
org.codehaus.groovy.grails.web.servlet.view.GroovyPageView.renderMergedOutputModel
(GroovyPageView.java:86)
        at org.springframework.web.servlet.view.AbstractView.render
(AbstractView.java:257)
        at
org.codehaus.groovy.grails.web.mapping.filter.UrlMappingsFilter.renderViewForUrlMappingInfo
(UrlMappingsFilter.java:235)
        at
org.codehaus.groovy.grails.web.mapping.filter.UrlMappingsFilter.doFilterInternal
(UrlMappingsFilter.java:188)
        at org.springframework.web.filter.OncePerRequestFilter.doFilter
(OncePerRequestFilter.java:76)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1084)
        at
org.codehaus.groovy.grails.web.sitemesh.GrailsPageFilter.obtainContent
(GrailsPageFilter.java:221)
        at org.codehaus.groovy.grails.web.sitemesh.GrailsPageFilter.doFilter
(GrailsPageFilter.java:126)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1084)
        at
org.codehaus.groovy.grails.web.servlet.filter.GrailsReloadServletFilter.doFilterInternal
(GrailsReloadServletFilter.java:101)
        at org.springframework.web.filter.OncePerRequestFilter.doFilter
(OncePerRequestFilter.java:76)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1084)
        at
org.codehaus.groovy.grails.web.servlet.mvc.GrailsWebRequestFilter.doFilterInternal
(GrailsWebRequestFilter.java:65)
        at org.springframework.web.filter.OncePerRequestFilter.doFilter
(OncePerRequestFilter.java:76)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1084)
        at
org.codehaus.groovy.grails.plugins.resourcesfirst.ResourcesFirstFilter.doFilter
(ResourcesFirstFilter.java:45)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1084)
        at
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal
(CharacterEncodingFilter.java:96)
        at org.springframework.web.filter.OncePerRequestFilter.doFilter
(OncePerRequestFilter.java:76)
        at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate
(DelegatingFilterProxy.java:236)
        at org.springframework.web.filter.DelegatingFilterProxy.doFilter
(DelegatingFilterProxy.java:167)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1084)
        at com.studentsonly.grails.plugins.uiperformance.CacheFilter.doFilter
(CacheFilter.java:71)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1084)
        at com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter
(SaveSessionFilter.java:35)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1084)
        at
com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter
(TransactionCleanupFilter.java:43)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1084)
        at org.mortbay.jetty.servlet.ServletHandler.handle
(ServletHandler.java:360)
        at org.mortbay.jetty.security.SecurityHandler.handle
(SecurityHandler.java:216)
        at org.mortbay.jetty.servlet.SessionHandler.handle
(SessionHandler.java:181)
        at org.mortbay.jetty.handler.ContextHandler.handle
(ContextHandler.java:712)
        at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:
405)
        at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle
(AppVersionHandlerMap.java:237)
        at org.mortbay.jetty.handler.HandlerWrapper.handle
(HandlerWrapper.java:139)
        at org.mortbay.jetty.Server.handle(Server.java:313)
        at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:
506)
        at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete
(HttpConnection.java:830)
        at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable
(RpcRequestParser.java:76)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
        at
com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest
(JettyServletEngineAdapter.java:139)
        at com.google.apphosting.runtime.JavaRuntime.handleRequest
(JavaRuntime.java:235)
        at com.google.apphosting.base.RuntimePb$EvaluationRuntime
$6.handleBlockingRequest(RuntimePb.java:4823)
        at com.google.apphosting.base.RuntimePb$EvaluationRuntime
$6.handleBlockingRequest(RuntimePb.java:4821)
        at com.google.net.rpc.impl.BlockingApplicationHandler.handleRequest
(BlockingApplicationHandler.java:24)
        at com.google.net.rpc.impl.RpcUtil.runRpcInApplication(RpcUtil.java:
359)
        at com.google.net.rpc.impl.Server$2.run(Server.java:820)
        at com.google.tracing.LocalTraceSpanRunnable.run
(LocalTraceSpanRunnable.java:56)
        at com.google.tracing.LocalTraceSpanBuilder.internalContinueSpan
(LocalTraceSpanBuilder.java:516)
        at com.google.net.rpc.impl.Server.startRpc(Server.java:775)
        at com.google.net.rpc.impl.Server.processRequest(Server.java:348)
        at com.google.net.rpc.impl.ServerConnection.messageReceived
(ServerConnection.java:436)
        at com.google.net.rpc.impl.RpcConnection.parseMessages
(RpcConnection.java:319)
        at com.google.net.rpc.impl.RpcConnection.dataReceived
(RpcConnection.java:290)
        at com.google.net.async.Connection.handleReadEvent(Connection.java:
428)
        at com.google.net.async.EventDispatcher.processNetworkEvents
(EventDispatcher.java:762)
        at com.google.net.async.EventDispatcher.internalLoop
(EventDispatcher.java:207)
        at com.google.net.async.EventDispatcher.loop(EventDispatcher.java:
101)
        at com.google.net.rpc.RpcService.runUntilServerShutdown
(RpcService.java:251)
        at com.google.apphosting.runtime.JavaRuntime$RpcRunnable.run
(JavaRuntime.java:374)
        at java.lang.Thread.run(Unknown Source)



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