HHH-18693 Fixing some PR comments

Author: cigaly

tooling/metamodel-generator/src/main/java/org/hibernate/processor/HibernateProcessor.java

@@ -367,7 +367,8 @@ private void processElement(Element element) {
 		try {
 			if ( !included( element )
 					|| hasAnnotation( element, Constants.EXCLUDE )
-					|| hasPackageAnnotation( element, Constants.EXCLUDE ) ) {
+					|| hasPackageAnnotation( element, Constants.EXCLUDE )
+					|| element.getModifiers().contains( Modifier.PRIVATE ) ) {
 				// skip it completely
 			}
 			else if ( isEntityOrEmbeddable( element ) && !element.getModifiers().contains( Modifier.PRIVATE )) {

tooling/metamodel-generator/src/main/java/org/hibernate/processor/util/StringUtil.java

@@ -98,7 +98,7 @@ public static String nameToMethodName(String name) {
 	}
 
 	public static String getUpperUnderscoreCaseFromLowerCamelCase(String lowerCamelCaseString) {
-		if ( lowerCamelCaseString.length() == 1 && Character.isUpperCase( lowerCamelCaseString.charAt( 0 ) ) ) {
+		if ( lowerCamelCaseString.length() == 1 && isUpperCase( lowerCamelCaseString.charAt( 0 ) ) ) {
 			return "_" + lowerCamelCaseString;
 		}
 		final StringBuilder result = new StringBuilder();