Bug 9159 Classpath wizard should not complain when adding missing source folder
Build 20020125 - Define a project A with source folder 'src1'. - Go to the .classpath file and edit it to insert one extra line: <classpathentry kind="src" path="src2"/> below the line referring to first source folder: <classpathentry kind="src" path="src1"/>. - Now, try to add this missing source folder 'src2', it isn't allowed by the wizard, one has to add a basic folder instead. Note: It is not such an uncommon scenario, the classpath modification could simply occur by catching up with a shared classpath having one more source folder on it, and which is locally missing.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/BuildPathsBlock.java
}
	
	/**
	 * Creates the Java project and sets the configured build path and output location.
	 * If the project already exists only build paths are updated.
	 */
	private void createJavaProject(List classPathEntries, IPath outputLocation, IRemoveOldBinariesQuery reorgQuery, IProgressMonitor monitor) throws CoreException, InterruptedException {
		
		
		if (reorgQuery != null) {
			IPath oldOutputLocation= fCurrJProject.getOutputLocation();
			if (fWorkspaceRoot.exists(oldOutputLocation)) {
				int result= reorgQuery.doQuery(oldOutputLocation);
				if (result == reorgQuery.CANCEL) {
					throw new InterruptedException();
				} else if (result == reorgQuery.YES) {
					removeOldClassfiles(fWorkspaceRoot.findMember(oldOutputLocation));
				}
			}		
		}
		
		
		if (!fWorkspaceRoot.exists(outputLocation)) {
			IFolder folder= fWorkspaceRoot.getFolder(outputLocation);
			CoreUtility.createFolder(folder, true, true, null);			
		}
		
		monitor.worked(2);
				
		int nEntries= classPathEntries.size();