ValidationInfo () { String name = getName(); PsiDirectory rootDir = getRootDir(); LanguageLevel level = rootDir != null ? PsiUtil.getLanguageLevel(rootDir) : LanguageLevel.HIGHEST; if (PsiNameHelper.getInstance(myProject).isIdentifier(name, level)) { return null; } return new ValidationInfo(JavaBundle.message("error.text.this.is.not.a.valid.java.class.name"), myNameTextField); }