Correct file descriptor leak for zip (#81)

Author: ddsharpe

imagetool/src/main/java/com/oracle/weblogic/imagetool/cli/cache/AddPatchEntry.java

@@ -60,18 +60,6 @@ public CommandResponse call() throws Exception {
         return new CommandResponse(-1, msg);
     }
 
-    /**
-     * Validate local patch file's digest against the digest stored in ARU.
-     *
-     * @param patchNumber the ARU patch number without the 'p'
-     * @param password    the password to be used for the ARU query (Oracle Support credential)
-     * @return true if the local file digest matches the digest stored in Oracle ARU
-     * @throws Exception if the ARU call to get patch details failed
-     */
-    private CommandResponse validateAndAddToCache(String patchNumber, String password) throws Exception {
-        return addToCache(patchNumber);
-    }
-
     /**
      * Add patch to the cache.
      *

imagetool/src/main/java/com/oracle/weblogic/imagetool/util/Utils.java

@@ -640,8 +640,7 @@ public static String getCacheDir() throws IOException {
 
     public static String getOpatchVersionFromZip(String fileName) {
 
-        try {
-            ZipFile zipFile = new ZipFile(fileName);
+        try (ZipFile zipFile = new ZipFile(fileName)) {
 
             Enumeration<? extends ZipEntry> entries = zipFile.entries();