fix findbug errors

Author: elek

hadoop-ozone/tools/src/main/java/org/apache/hadoop/ozone/freon/BaseFreonGenerator.java

@@ -246,6 +246,7 @@ public String generateObjectName(long counter) {
    */
   public void ensureVolumeAndBucketExist(OzoneConfiguration ozoneConfiguration,
       String volumeName, String bucketName) throws IOException {
+
     try (OzoneClient rpcClient = OzoneClientFactory
         .getRpcClient(ozoneConfiguration)) {
 
@@ -256,6 +257,8 @@ public void ensureVolumeAndBucketExist(OzoneConfiguration ozoneConfiguration,
         if (ex.getResult() == ResultCodes.VOLUME_NOT_FOUND) {
           rpcClient.getObjectStore().createVolume(volumeName);
           volume = rpcClient.getObjectStore().getVolume(volumeName);
+        } else {
+          throw ex;
         }
       }
 

hadoop-ozone/tools/src/main/java/org/apache/hadoop/ozone/freon/OzoneClientKeyValidator.java

@@ -56,10 +56,6 @@ public class OzoneClientKeyValidator extends BaseFreonGenerator
 
   private Timer timer;
 
-  private OzoneBucket bucket;
-
-  private ContentGenerator contentGenerator;
-
   private byte[] referenceDigest;
 
   private OzoneClient rpcClient;

hadoop-ozone/tools/src/main/java/org/apache/hadoop/ozone/freon/S3KeyGenerator.java

@@ -75,8 +75,6 @@ public Void call() throws Exception {
 
     init();
 
-    OzoneConfiguration configuration = createOzoneConfiguration();
-
     AmazonS3ClientBuilder amazonS3ClientBuilder =
         AmazonS3ClientBuilder.standard()
             .withCredentials(new EnvironmentVariableCredentialsProvider());

hadoop-ozone/tools/src/main/java/org/apache/hadoop/ozone/freon/SameKeyReader.java

@@ -62,10 +62,6 @@ public class SameKeyReader extends BaseFreonGenerator
 
   private Timer timer;
 
-  private OzoneBucket bucket;
-
-  private ContentGenerator contentGenerator;
-
   private byte[] referenceDigest;
 
   private OzoneClient rpcClient;