### Eclipse Workspace Patch 1.0
#P org.eclipse.jdt.ui
Index: ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/newsourcepage/ConfigureBuildPathAction.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/newsourcepage/ConfigureBuildPathAction.java,v
retrieving revision 1.10
diff -u -r1.10 ConfigureBuildPathAction.java
--- ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/newsourcepage/ConfigureBuildPathAction.java	23 Nov 2006 09:23:50 -0000	1.10
+++ ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/newsourcepage/ConfigureBuildPathAction.java	24 Mar 2007 19:39:22 -0000
@@ -12,6 +12,7 @@
 
 import java.util.HashMap;
 
+import org.eclipse.core.runtime.CoreException;
 import org.eclipse.core.runtime.IAdaptable;
 import org.eclipse.core.runtime.Path;
 
@@ -107,8 +108,14 @@
 			IResource res= (IResource) ((IAdaptable) firstElement).getAdapter(IResource.class);
 			if (res == null)
 				return false;
-			
-			return res.getProject() != null;
+			IProject project = res.getProject();
+			if (project == null || !project.isOpen())
+				return false;
+			try {
+				return project.hasNature(JavaCore.NATURE_ID);
+			} catch (CoreException e) {
+				return false;
+			}
 		}
 		return false;
 	}