missing method call (#1094)

Author: CarolynRountree

core/src/main/java/oracle/weblogic/deploy/util/XPathUtil.java

@@ -37,9 +37,11 @@ public XPathUtil(String oracle_home){
         this.oracle_home = oracle_home;
         patches_home = Paths.get(oracle_home, "inventory", "patches").toString();
     }
+
     public XPathUtil() {
         // for testing only
     }
+
     private static XPathFactory factory = null;
 
     private static synchronized XPathFactory factory() {
@@ -66,8 +68,7 @@ public String getPSU() {
             String descrip = description(doc, "//@description");
             LOGGER.fine("Description {0}", descrip);
             if (descrip != null && descrip.startsWith("WLS PATCH SET UPDATE")) {
-                int idx = descrip.lastIndexOf('.');
-                String psu  = descrip.substring(idx+1).split("[\\d]+")[0];
+                String psu = extractPsu(descrip);
                 list.add(psu);
                 Collections.sort(list);
                 return list.get(list.size() -1);
@@ -85,6 +86,7 @@ public String extractPsu(String descrip) {
         return descrip.substring(idx, endIdx+1);
     }
 
+
     /**
      * Locate the patch files in the Oracle home
      * @return list of patch file names.