Bug 13034 Cannot create a Source Folder in a new Java Project
build 20020404 If you try and create a Source Folder in a Java Project you have just created you get an error preventing you from hitting finish. STEPS 1) Create Java Project Foo 2) Open New->Source Folder 3) Enter Bar as the name - you will get "Cannot nest entry Bar inside entry Foo/Bar" 4) Create a folder Bar. 5) Add it as a source folder in the Properties Dialog for Foo. No problem.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/BuildPathsBlock.java
*/
	private void updateClassPathStatus() {
		fClassPathStatus.setOK();
		
		List elements= fClassPathList.getElements();
	
		boolean entryMissing= false;
		IClasspathEntry[] entries= new IClasspathEntry[elements.size()];
		for (int i= elements.size()-1 ; i >= 0 ; i--) {
			CPListElement currElement= (CPListElement)elements.get(i);
			boolean isChecked= fClassPathList.isChecked(currElement);
			if (currElement.getEntryKind() == IClasspathEntry.CPE_SOURCE) {
				if (!isChecked) {
					fClassPathList.setCheckedWithoutUpdate(currElement, true);
				}
			} else {
				currElement.setExported(isChecked);
			}
			entries[i]= currElement.getClasspathEntry();
			entryMissing= entryMissing || currElement.isMissing();			
		}
				
		if (entryMissing) {
			fClassPathStatus.setWarning(NewWizardMessages.getString("BuildPathsBlock.warning.EntryMissing")); 
		}
				
		if (fCurrJProject.hasClasspathCycle(entries)) {
			fClassPathStatus.setWarning(NewWizardMessages.getString("BuildPathsBlock.warning.CycleInClassPath")); 
		}	
	}