Fix Checkstyle errors

Author: kyakdan

src/main/java/org/apache/commons/jxpath/ri/JXPathClassFilter.java

@@ -37,5 +37,5 @@ public interface JXPathClassFilter {
      * passed.
      * @return true if the java class can be exposed via xpath, false otherwise
      */
-    public boolean exposeToXPath(String className);
+    boolean exposeToXPath(String className);
 }

src/main/java/org/apache/commons/jxpath/ri/JXPathFilter.java

@@ -30,7 +30,7 @@
  * @version $Revision$ $Date$
  */
 public class JXPathFilter implements JXPathClassFilter {
-    Set<String> allowedClassesList = null;
+    private Set<String> allowedClassesList = null;
 
     public JXPathFilter() {
         init();