[jboss-dev-forums] unable to open dsl file

Hi, I am new to jboss drools.I have created some rules which are working sucessfully.I also have a decision tables example,which is working fine.However,when i try to open a dsl file,i am getting the following error message in eclipse.I initially used jars of drools 3.0.6 but now i am using jars of drools 4.0.I am getting the exception in both the cases.Could somebody please advice. eclipse.buildId=M20060921-0945 java.version=1.5.0_07 java.vendor=Sun Microsystems Inc. BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=en_US Command-line arguments: -os win32 -ws win32 -arch x86 -clean !ENTRY org.eclipse.jface 4 2 2007-06-26 15:55:00.825 !MESSAGE Problems occurred when invoking code from plug-in: "org.eclipse.jface". !STACK 0 java.lang.NoClassDefFoundError: org/drools/lang/dsl/template/NLGrammar at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(Unknown Source) at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.defineClass(DefaultClassLoader.java:160) at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.defineClass(ClasspathManager.java:498) at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findClassImpl(ClasspathManager.java:468) at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClassImpl(ClasspathManager.java:427) at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:410) at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:188) at org.eclipse.osgi.framework.internal.core.BundleLoader.findLocalClass(BundleLoader.java:334) at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:386) at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:347) at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:83) at java.lang.ClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClassInternal(Unknown Source) at org.drools.ide.dsl.editor.DSLEditor.init(DSLEditor.java:151) at org.eclipse.ui.internal.EditorManager.createSite(EditorManager.java:840) at org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:583) at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:372) at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:566) at org.eclipse.ui.internal.EditorReference.getEditor(EditorReference.java:214) at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditorBatched(WorkbenchPage.java:2595) 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(PackageExplorerActionGroup.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:928) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3348) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2968) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1914) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1878) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:419) 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:92) 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(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) 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) Regards Devs --------------------------------- Food fight? Enjoy some healthy debate in the Yahoo! Answers Food & Drink Q&A.