How to properly setup Mercurial plugin for Eclipse?

Question

Just added Mercurial plugin (1.4.12.86) to Eclipse (Web Dev Version, Build id:20090920-1017), and got this error on startup:

Cannot run program "hg": CreateProcess error=2, The system cannot find the file specified

Found a thread on the same problem, but have no idea how to fix it.

Here's more from the log:

!SUBENTRY 1 com.vectrace.MercurialEclipse 4 -100 2009-09-29 22:41:09.150
!MESSAGE Cannot run program "hg": CreateProcess error=2, The system cannot find the file specified
!STACK 0
java.io.IOException: Cannot run program "hg": CreateProcess error=2, The system cannot find the file specified
    at java.lang.ProcessBuilder.start(Unknown Source)
    at com.vectrace.MercurialEclipse.commands.AbstractShellCommand.executeToStream(AbstractShellCommand.java:191)
    at com.vectrace.MercurialEclipse.commands.AbstractShellCommand.executeToBytes(AbstractShellCommand.java:139)
    at com.vectrace.MercurialEclipse.commands.AbstractShellCommand.executeToBytes(AbstractShellCommand.java:126)
    at com.vectrace.MercurialEclipse.commands.HgDebugInstallClient.debugInstall(HgDebugInstallClient.java:24)
    at com.vectrace.MercurialEclipse.MercurialEclipsePlugin.checkHgInstallation(MercurialEclipsePlugin.java:117)
    at com.vectrace.MercurialEclipse.preferences.GeneralPreferencePage$LabelDecoratorRadioGroupFieldEditor.doStore(GeneralPreferencePage.java:55)
    at org.eclipse.jface.preference.FieldEditor.store(FieldEditor.java:680)
    at org.eclipse.jface.preference.FieldEditorPreferencePage.performOk(FieldEditorPreferencePage.java:343)
    at org.eclipse.jface.preference.PreferencePage.performApply(PreferencePage.java:432)
    at org.eclipse.jface.preference.PreferencePage$2.widgetSelected(PreferencePage.java:281)
    at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:228)
    at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1003)
    at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3880)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3473)
    at org.eclipse.jface.window.Window.runEventLoop(Window.java:825)
    at org.eclipse.jface.window.Window.open(Window.java:801)
    at org.eclipse.ui.internal.dialogs.WorkbenchPreferenceDialog.open(WorkbenchPreferenceDialog.java:211)
    at org.eclipse.ui.internal.OpenPreferencesAction.run(OpenPreferencesAction.java:65)
    at org.eclipse.jface.action.Action.runWithEvent(Action.java:498)
    at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:584)
    at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:501)
    at org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContributionItem.java:411)
    at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1003)
    at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3880)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3473)
    at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2405)
    at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2369)
    at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2221)
    at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:500)
    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
    at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:493)
    at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
    at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:113)
    at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:194)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:368)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:559)
    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:514)
    at org.eclipse.equinox.launcher.Main.run(Main.java:1311)
Caused by: java.io.IOException: CreateProcess error=2, The system cannot find the file specified
    at java.lang.ProcessImpl.create(Native Method)
    at java.lang.ProcessImpl.<init>(Unknown Source)
    at java.lang.ProcessImpl.start(Unknown Source)

Answer 1

Do you have mercurial installed locally? ie. can you run hg from the command line/dos box? If not, you need to start with that - get it from the Mercurial website.

Answer 2

You might have mercurial installed locally on windows, but have yet to restart windows since you installed. After you reboot the eclipse plugin will be able to find the mercurial installation.