if (jp != null){
if (jp != null && jp.exists()){
	private void modifyClassPaths(IProgressMonitor pm) throws JavaModelException{		IProject[] referencing=getReferencingProjects();		pm.beginTask(RefactoringCoreMessages.getString("RenameJavaProjectChange.update"), referencing.length);	 //$NON-NLS-1$		for (int i= 0; i < referencing.length; i++) {			IJavaProject jp= JavaCore.create(referencing[i]);			if (jp != null){				modifyClassPath(jp, new SubProgressMonitor(pm, 1));			}	else{				pm.worked(1);			}			}		pm.done();			}