Changed method to private as it only used by ScriptEvaluator class.

src/main/java/org/lsc/utils/ScriptingEvaluator.java

@@ -94,7 +94,7 @@ else if ("graal.js".equals(name)) {
 		}
 	}
 
-	public static ScriptingEvaluator getInstance() {
+	private static ScriptingEvaluator getInstance() {
         String threadName = Thread.currentThread().getName();
         ScriptingEvaluator scriptingEvaluator = null;