Bug 120544 [build path] Editing external source folder does not persist
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/BuildPathsBlock.java
fClassPathList.setGrayedWithoutUpdate(currElement, true);
				}
			} else {
				currElement.setExported(isChecked);
			}
			entries[i]= currElement.getClasspathEntry();
			if (currElement.isMissing()) {
				nEntriesMissing++;
				if (entryMissing == null) {
					entryMissing= currElement;
				}
			}
		}
				
		if (nEntriesMissing > 0) {
			if (nEntriesMissing == 1) {
				fClassPathStatus.setWarning(Messages.format(NewWizardMessages.BuildPathsBlock_warning_EntryMissing, entryMissing.getPath().toString())); 
			} else {
				fClassPathStatus.setWarning(Messages.format(NewWizardMessages.BuildPathsBlock_warning_EntriesMissing, String.valueOf(nEntriesMissing))); 
			}
		}
				
/*		if (fCurrJProject.hasClasspathCycle(entries)) {
			fClassPathStatus.setWarning(NewWizardMessages.getString("BuildPathsBlock.warning.CycleInClassPath")); 
		}
*/		
		updateBuildPathStatus();
	}
	/**
	 * Validates output location & build path.