Exact same issue with Ganimedes on Mac OS X Leopard 10.5.3.

eclipse.buildId=I20080617-2000
java.version=1.5.0_13
java.vendor=Apple Inc.
BootLoader constants: OS=macosx, ARCH=x86, WS=carbon, NL=en_US
Framework arguments: -keyring /Users/erwin/.eclipse_keyring -showlocation
Command-line arguments: -os macosx -ws carbon -arch x86 -keyring /Users/erwin/.eclipse_keyring -consoleLog -showlocation

Error
Fri Jun 27 21:14:22 EDT 2008
Problems occurred when invoking code from plug-in: "org.eclipse.jface".

java.lang.NoClassDefFoundError: org/eclipse/ui/internal/util/SWTResourceUtil
at org.hibernate.eclipse.console.workbench.xpl.AnyAdaptableLabelProvider.getImage(AnyAdaptableLabelProvider.java:166)

I got the same problem with Ganymede, trying to access Hibernate Configuration from Hibernate Perspective.

Workaround
retrieve the missing file org/eclipse/ui/internal/util/SWTResourceUtil.class from older Eclipse version, add to workbench jar file into Eclipse plugins directory and restart Eclipse.

In my case, I got the file from Eclipse 3.2.2, plugins, org.eclipse.ui.workbench_3.3.1.M20070921-1200.jar and added it to org.eclipse.ui.workbench_3.4.0.I20080606-1300.jar of Eclipse Ganymede version:
after Eclipse restarting, it works

It worked for me also.
Although the "Hibernate Configuration" view is very slow compared to its behaviour in Eclipse 3.3.2. Anyway it can be used as a workaround.

Lets hope for a new version of Hibernate tools compatible with Ganymede soon.

hibernate tools trunk is already working against Ganymede. Try using the nightly builds.

If you still see big performance issues please report that in a seperate issue - thanks.

The problem still exists!

I'm using a fresh Eclipse 3.4.1 (Build id: M20080911-1700) with Hibernate Tools 3.2.3.GA (installed via http://download.jboss.org/jbosstools/updates/stable/).

If you click on anything in the Hibernate Configurator you get the same error. But if you persist and keep clicking OK on the error dialogs it seems to work, although it's very very slow.

The error is:

!ENTRY org.eclipse.jface 4 2 2009-02-17 15:24:35.681
!MESSAGE Problems occurred when invoking code from plug-in: "org.eclipse.jface".
!STACK 0
java.lang.NoClassDefFoundError: org/eclipse/ui/internal/util/SWTResourceUtil
at org.hibernate.eclipse.console.workbench.xpl.AnyAdaptableLabelProvider.getImage(AnyAdaptableLabelProvider.java:166)
at org.eclipse.jface.viewers.WrappedViewerLabelProvider.getImage(WrappedViewerLabelProvider.java:117)
at org.eclipse.jface.viewers.WrappedViewerLabelProvider.update(WrappedViewerLabelProvider.java:165)
at org.eclipse.jface.viewers.ViewerColumn.refresh(ViewerColumn.java:145)
at org.eclipse.jface.viewers.AbstractTreeViewer.doUpdateItem(AbstractTreeViewer.java:932)
at org.eclipse.jface.viewers.AbstractTreeViewer$UpdateItemSafeRunnable.run(AbstractTreeViewer.java:102)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
at org.eclipse.core.runtime.Platform.run(Platform.java:880)
at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:48)
at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175)
at org.eclipse.jface.viewers.AbstractTreeViewer.doUpdateItem(AbstractTreeViewer.java:1012)
at org.eclipse.jface.viewers.StructuredViewer$UpdateItemSafeRunnable.run(StructuredViewer.java:466)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
at org.eclipse.core.runtime.Platform.run(Platform.java:880)
at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:48)
at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175)
at org.eclipse.jface.viewers.StructuredViewer.updateItem(StructuredViewer.java:2041)
at org.eclipse.jface.viewers.AbstractTreeViewer.createTreeItem(AbstractTreeViewer.java:827)
at org.eclipse.jface.viewers.AbstractTreeViewer.createAddedElements(AbstractTreeViewer.java:340)
at org.eclipse.jface.viewers.AbstractTreeViewer.internalAdd(AbstractTreeViewer.java:270)
at org.eclipse.jface.viewers.TreeViewer.internalAdd(TreeViewer.java:652)
at org.hibernate.eclipse.console.viewers.xpl.MTreeViewer.add(MTreeViewer.java:106)
at org.eclipse.ui.progress.DeferredTreeContentManager$3.runInUIThread(DeferredTreeContentManager.java:353)
at org.eclipse.ui.progress.UIJob$1.run(UIJob.java:94)
at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:133)
at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3800)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3425)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2382)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2346)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2198)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:493)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:288)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:488)
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:193)
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:386)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
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:597)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:549)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:504)
at org.eclipse.equinox.launcher.Main.run(Main.java:1236)
Caused by: java.lang.ClassNotFoundException: org.eclipse.ui.internal.util.SWTResourceUtil
at org.eclipse.osgi.framework.internal.core.BundleLoader.findClassInternal(BundleLoader.java:481)
at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:397)
at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:385)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:87)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
... 48 more