Bug 98710 Filter native library and access restriction attributes on jars in JRE containers
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/CPListElement.java
isMissing=  root.findMember(resolvedPath) == null && !resolvedPath.toFile().isFile();
				break;
			case IClasspathEntry.CPE_LIBRARY:
				res= root.findMember(path);
				if (res == null) {
					if (!ArchiveFileFilter.isArchivePath(path)) {
						if (root.getWorkspace().validatePath(path.toString(), IResource.FOLDER).isOK()
								&& root.getProject(path.segment(0)).exists()) {
							res= root.getFolder(path);
						}
					}
					isMissing= !path.toFile().isFile(); 
				}
				break;
			case IClasspathEntry.CPE_SOURCE:
				path= path.removeTrailingSeparator();
				res= root.findMember(path);
				if (res == null) {
					if (root.getWorkspace().validatePath(path.toString(), IResource.FOLDER).isOK()) {
						res= root.getFolder(path);
					}
					isMissing= true;
				}
				break;
			case IClasspathEntry.CPE_PROJECT:
				res= root.findMember(path);
				isMissing= (res == null);
				break;
		}
		CPListElement elem= new CPListElement(parent, project, curr.getEntryKind(), path, res);