Trac author: SaphireBlue
Attachment: file:090123ScalaPluginForEclipse.txt

I'm afraid there's not a lot I can do without a reproducible test case. You say you were "having other problems with the plugin" but don't specify ... it's likely that this issue is a side-effect of whatever those were, so please open tickets for those issues with full details.

Closed As: invalid

I am having the same problem
but i cannot open all scala files in eclipse

using scala eclipse plugin 2.8.0.r22118

my error is
Java Model Exception: Java Model Status [DBPedia does not exist]
at org.eclipse.jdt.internal.core.JavaElement.newNotPresentException(JavaElement.java:492)
at org.eclipse.jdt.internal.core.JavaModelManager.getPerProjectInfoCheckExistence(JavaModelManager.java:2097)
at org.eclipse.jdt.internal.core.JavaProject.getPerProjectInfo(JavaProject.java:1820)
at org.eclipse.jdt.internal.core.JavaProject.getResolvedClasspath(JavaProject.java:1887)
at scala.tools.eclipse.ScalaProject.classpath(ScalaProject.scala:92)
at scala.tools.eclipse.ScalaProject.initialize(ScalaProject.scala:304)
at scala.tools.eclipse.ScalaProject$$anon$1.create(ScalaProject.scala:43)
at scala.tools.eclipse.ScalaProject$$anon$1.create(ScalaProject.scala:39)
at scala.tools.eclipse.util.Cached$class.apply(Cached.scala:44)
at scala.tools.eclipse.ScalaProject$$anon$1.apply(ScalaProject.scala:39)
at scala.tools.eclipse.ScalaProject.withPresentationCompiler(ScalaProject.scala:364)
at scala.tools.eclipse.javaelements.ScalaCompilationUnit$class.discard(ScalaCompilationUnit.scala:62)
at scala.tools.eclipse.javaelements.ScalaSourceFile.discard(ScalaSourceFile.scala:40)
at scala.tools.eclipse.javaelements.ScalaCompilationUnit$class.close(ScalaCompilationUnit.scala:66)
at scala.tools.eclipse.javaelements.ScalaSourceFile.close(ScalaSourceFile.scala:40)
at org.eclipse.jdt.internal.core.CompilationUnit.becomeWorkingCopy(CompilationUnit.java:97)
at org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitDocumentProvider.createFileInfo(CompilationUnitDocumentProvider.java:983)
at org.eclipse.ui.editors.text.TextFileDocumentProvider.connect(TextFileDocumentProvider.java:478)
at org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitDocumentProvider.connect(CompilationUnitDocumentProvider.java:1198)
at org.eclipse.ui.texteditor.AbstractTextEditor.doSetInput(AbstractTextEditor.java:4135)
at org.eclipse.ui.texteditor.StatusTextEditor.doSetInput(StatusTextEditor.java:203)
at org.eclipse.ui.texteditor.AbstractDecoratedTextEditor.doSetInput(AbstractDecoratedTextEditor.java:1413)
at org.eclipse.jdt.internal.ui.javaeditor.JavaEditor.internalDoSetInput(JavaEditor.java:2552)
at org.eclipse.jdt.internal.ui.javaeditor.JavaEditor.doSetInput(JavaEditor.java:2525)
at org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitEditor.doSetInput(CompilationUnitEditor.java:1371)
at org.eclipse.ui.texteditor.AbstractTextEditor$19.run(AbstractTextEditor.java:3116)
at org.eclipse.jface.operation.ModalContext.runInCurrentThread(ModalContext.java:464)
at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:372)
at org.eclipse.jface.window.ApplicationWindow$1.run(ApplicationWindow.java:759)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
at org.eclipse.jface.window.ApplicationWindow.run(ApplicationWindow.java:756)
at org.eclipse.ui.internal.WorkbenchWindow.run(WorkbenchWindow.java:2579)
at org.eclipse.ui.texteditor.AbstractTextEditor.internalInit(AbstractTextEditor.java:3134)
at org.eclipse.ui.texteditor.AbstractTextEditor.init(AbstractTextEditor.java:3161)
at org.eclipse.ui.internal.EditorManager.createSite(EditorManager.java:798)
at org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:644)
at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:462)
at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:595)
at org.eclipse.ui.internal.EditorReference.getEditor(EditorReference.java:286)
at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditorBatched(WorkbenchPage.java:2857)
at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2762)
at org.eclipse.ui.internal.WorkbenchPage.access$11(WorkbenchPage.java:2754)
at org.eclipse.ui.internal.WorkbenchPage$10.run(WorkbenchPage.java:2705)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2701)
at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2685)
at org.eclipse.ui.actions.OpenWithMenu.openEditor(OpenWithMenu.java:344)
at org.eclipse.ui.actions.OpenWithMenu$2.handleEvent(OpenWithMenu.java:192)
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:3910)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3503)
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)

I don't doubt you're having a problem, but it's not in any way related to this ticket, so please don't hijack it. Please read the bug reporting guidlines here,

http://scala-ide.assembla.com/wiki/show/scala-ide/Bug_Reporting

In particular the part about asking for assistance on the scala-ide-user mailing list.