|
[#1026] |
project: eclipse-plugin |
priority: low |
category: bug |
|---|
|
submitter |
assigned to |
status |
date submitted |
|
Nikolay |
Sean |
not repro |
2007-03-26 13:38:22.0 |
| subject |
[contrib #402] java.util.NoSuchElementException: tail of empty list |
| code |
Clicking on the net.liftweb.example.controller.Chat I get an exception. Here's that code:
package net.liftweb.example.controller
import scala.actors._
import scala.actors.Actor._
import net.liftweb.http._
import net.liftweb.util.Helpers._
import scala.collection.immutable.TreeMap
import scala.xml._
class Chat extends ControllerActor {
private var userName = ""
private var currentData: List[ChatLine] = Nil
private val server = {
val ret = ChatServer.server
ret !? ChatServerAdd(this) match {
case ChatServerUpdate(value) => currentData = value
case _ => {}
}
ret
}
override def lowPriority : PartialFunction[Any, Unit] = {
case ChatServerUpdate(value) => {
currentData = value
reRender
loop
}
}
def render = {
val inputName = this.uniqueId+"_msg"
S.addFunctionMap(inputName, sendMessage)
<span>Hello "{userName}"<ul>{
currentData.reverse.map{
cl =>
<li>{hourFormat(cl.when)} {cl.user}: {cl.msg}</li>
}.toList
}</ul><lift:form method="POST">
<input name={inputName} type="text" value=""/><input value="Send" type="submit"/>
</lift:form></span>
}
override def localSetup {
if (userName.length == 0) {
ask(new AskName, "what's your username") {
answer =>
answer match {
case s : String if (s.length > 2) => userName = s; true
case _ => localSetup; true
}
}
}
}
def waitForUpdate : Option[List[ChatLine]] = {
receiveWithin(100) {
case ChatServerUpdate(l) => Some(l)
case TIMEOUT => None
}
}
def sendMessage(in: List[String]) = {
server ! ChatServerMsg(userName, in.head)
waitForUpdate match {
case Some(l : List[ChatLine]) => currentData = l ; true
case _ => true
}
}
}
|
| what happened |
java.util.NoSuchElementException: tail of empty list
at scala.Nil$.tail(List.scala:1146)
at scala.tools.nsc.symtab.Symbols$Symbol.allOverriddenSymbols(Symbols.scala:795)
at ch.epfl.lamp.sdt.ui.scalaeditor.OverrideIndicatorManager$OverrideIndicator.overrides(OverrideIndicato\
rManager.java:25)
at ch.epfl.lamp.sdt.ui.scalaeditor.OverrideIndicatorManager$OverrideIndicator.isValid(OverrideIndicatorM\
anager.java:51)
at ch.epfl.lamp.sdt.ui.scalaeditor.OverrideIndicatorManager.refresh(OverrideIndicatorManager.java:82)
at ch.epfl.lamp.sdt.ui.actions.HighlightAction.run(HighlightAction.java:107)
at ch.epfl.lamp.sdt.ui.actions.HighlightAction.run(HighlightAction.java:79)
at ch.epfl.lamp.sdt.ui.actions.HighlightAction$1.run(HighlightAction.java:63)
at ch.epfl.lamp.sdt.ui.actions.HighlightAction.run(HighlightAction.java:67)
at ch.epfl.lamp.sdt.ui.scalaeditor.ScalaEditor$2.focusGained(ScalaEditor.java:229)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:105)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1496)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1520)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1501)
at org.eclipse.swt.widgets.Control.sendFocusEvent(Control.java:2290)
at org.eclipse.swt.widgets.Control.forceFocus(Control.java:810)
at org.eclipse.swt.widgets.Control.setFocus(Control.java:2654)
at org.eclipse.swt.widgets.Composite.setFocus(Composite.java:892)
at org.eclipse.ui.texteditor.AbstractTextEditor.setFocus(AbstractTextEditor.java:4839)
at org.eclipse.ui.internal.PartPane.setFocus(PartPane.java:309)
at org.eclipse.ui.internal.EditorPane.setFocus(EditorPane.java:117)
at org.eclipse.ui.internal.WorkbenchPage$3.run(WorkbenchPage.java:600)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
at org.eclipse.core.runtime.Platform.run(Platform.java:843)
at org.eclipse.ui.internal.WorkbenchPage.activatePart(WorkbenchPage.java:595)
at org.eclipse.ui.internal.WorkbenchPage.setActivePart(WorkbenchPage.java:3203)
at org.eclipse.ui.internal.WorkbenchPage.activate(WorkbenchPage.java:588)
at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditorBatched(WorkbenchPage.java:2604)
at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2528)
at org.eclipse.ui.internal.WorkbenchPage.access$10(WorkbenchPage.java:2520)
at org.eclipse.ui.internal.WorkbenchPage$9.run(WorkbenchPage.java:2505)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:67)
at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2500)
at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2485)
at org.eclipse.ui.ide.IDE.openEditor(IDE.java:388)
at org.eclipse.ui.ide.IDE.openEditor(IDE.java:350)
at org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.openInEditor(EditorUtility.java:275)
at org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.openInEditor(EditorUtility.java:139)
at org.eclipse.jdt.internal.ui.actions.OpenActionUtil.open(OpenActionUtil.java:49)
at org.eclipse.jdt.ui.actions.OpenAction.run(OpenAction.java:190)
at org.eclipse.jdt.ui.actions.OpenAction.run(OpenAction.java:174)
at org.eclipse.jdt.ui.actions.SelectionDispatchAction.dispatchRun(SelectionDispatchAction.java:267)
at org.eclipse.jdt.ui.actions.SelectionDispatchAction.run(SelectionDispatchAction.java:243)
at org.eclipse.jdt.internal.ui.packageview.PackageExplorerActionGroup.handleOpen(PackageExplorerActionGr\
oup.java:306)
at org.eclipse.jdt.internal.ui.packageview.PackageExplorerPart$4.open(PackageExplorerPart.java:653)
at org.eclipse.jface.viewers.StructuredViewer$2.run(StructuredViewer.java:817)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
at org.eclipse.core.runtime.Platform.run(Platform.java:843)
at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:44)
at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:149)
at org.eclipse.jface.viewers.StructuredViewer.fireOpen(StructuredViewer.java:815)
at org.eclipse.jface.viewers.StructuredViewer.handleOpen(StructuredViewer.java:1069)
at org.eclipse.jface.viewers.StructuredViewer$6.handleOpen(StructuredViewer.java:1168)
at org.eclipse.jface.util.OpenStrategy.fireOpenEvent(OpenStrategy.java:249)
at org.eclipse.jface.util.OpenStrategy.access$2(OpenStrategy.java:243)
at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:283)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1496)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1520)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1505)
at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1279)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3312)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2941)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1930)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1894)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:422)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:95)
at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:78)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:9\
2)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:68)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:400)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:177)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.eclipse.core.launcher.Main.invokeFramework(Main.java:336)
at org.eclipse.core.launcher.Main.basicRun(Main.java:280)
at org.eclipse.core.launcher.Main.run(Main.java:977)
at org.eclipse.core.launcher.Main.main(Main.java:952)
|
| what expected |
nothing should happen. Running Eclipse 3.2.2 on a mac, scala plugin versions: scala debug 1.2, dev tools core 2.36, tools ui 2.4.0 |
|
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