Coverity Scan Cleanup

• • CID 1371037: Exceptional resource leaks (RESOURCE_LEAK)
    /gateway-shell/src/main/java/org/apache/hadoop/gateway/shell/KnoxSh.java: 191 in org.apache.hadoop.gateway.shell.KnoxSh$KnoxInit.execute()()

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• • • CID 1371037: Exceptional resource leaks (RESOURCE_LEAK)
      /gateway-shell/src/main/java/org/apache/hadoop/gateway/shell/KnoxSh.java: 191 in org.apache.hadoop.gateway.shell.KnoxSh$KnoxInit.execute()()
      185 //println "Access Token: " + json.access_token
      186 System.out.println("knoxinit successful!");
      187 displayTokenDetails(json);
      188
      189 File tokenfile = new File(System.getProperty("user.home"), ".knoxtokencache");
      190 FileOutputStream fos = new FileOutputStream(tokenfile);
      CID 1371037: Exceptional resource leaks (RESOURCE_LEAK)
      Variable "fos" going out of scope leaks the resource it refers to.
      191 fos.write(text.getBytes("UTF-8"));
      192
      193 Set<PosixFilePermission> perms = new HashSet<PosixFilePermission>();
      194 fos.close();
      195
      196 //add owners permission only

• • CID 1371036: Null pointer dereferences (NULL_RETURNS)
    /gateway-service-knoxtoken/src/main/java/org/apache/hadoop/gateway/service/knoxtoken/TokenResource.java: 121 in org.apache.hadoop.gateway.service.knoxtoken.TokenResource.getAuthenticationToken()()

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• • • CID 1371036: Null pointer dereferences (NULL_RETURNS)
      /gateway-service-knoxtoken/src/main/java/org/apache/hadoop/gateway/service/knoxtoken/TokenResource.java: 121 in org.apache.hadoop.gateway.service.knoxtoken.TokenResource.getAuthenticationToken()()
      115 for (int i = 0; i < targetAudiences.length; i++) { 116 aud.add(targetAudiences[i]); 117 }

      118 token = ts.issueToken(p, aud, "RS256", expires);
      119 }
      120
      CID 1371036: Null pointer dereferences (NULL_RETURNS)
      Calling a method on null object "token".
      121 String accessToken = token.toString();
      122
      123 HashMap<String, Object> map = new HashMap<String, Object>();
      124 // TODO: populate map from JWT authorization code
      125 map.put(ACCESS_TOKEN, accessToken);
      126 map.put(TOKEN_TYPE, BEARER);

• • CID 1371035: (NULL_RETURNS)
    /gateway-shell/src/main/java/org/apache/hadoop/gateway/shell/KnoxSh.java: 173 in org.apache.hadoop.gateway.shell.KnoxSh$KnoxInit.execute()()
    /gateway-shell/src/main/java/org/apache/hadoop/gateway/shell/KnoxSh.java: 174 in org.apache.hadoop.gateway.shell.KnoxSh$KnoxInit.execute()()

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• • • CID 1371035: (NULL_RETURNS)
      /gateway-shell/src/main/java/org/apache/hadoop/gateway/shell/KnoxSh.java: 173 in org.apache.hadoop.gateway.shell.KnoxSh$KnoxInit.execute()()
      167 public void execute() throws Exception {
      168 Credentials credentials = new Credentials();
      169 credentials.add("ClearInput", "Enter username: ", "user")
      170 .add("HiddenInput", "Enter pas" + "sword: ", "pass");
      171 credentials.collect();
      172
      CID 1371035: (NULL_RETURNS)
      Calling a method on null object "credentials.get("user")".
      173 String username = credentials.get("user").string();
      174 String pass = credentials.get("pass").string();
      175
      176 Hadoop session = null;
      177 Response response = null;
      178 try
      Unknown macro: {/gateway-shell/src/main/java/org/apache/hadoop/gateway/shell/KnoxSh.java}

      206
      207 private static GatewayFilter createFilter( InputStream stream, ServletContext servletContext ) throws ServletException {
      208 try {
      CID 1371034: Null pointer dereferences (FORWARD_NULL)
      Assigning: "filter" = "null".
      209 GatewayFilter filter = null;
      210 if( stream != null ) {
      211 try

      { 212 GatewayDescriptor descriptor = GatewayDescriptorFactory.load( "xml", new InputStreamReader( stream ) ); 213 filter = GatewayFactory.create( descriptor ); 214 }

      finally {