hadoop集群配置了kerberos后，如何使用JAVA程序调用？

hadoop集群配置了kerberos后，如何使用JAVA程序调用？

使用的是Cloudera 的CDH5.3,配置好kerberos后，使用如何JAVA代码访问，总是报：Unable to obtain password from user

public static void test1(String user, String keytab, String dir) throws Exception {
        Configuration conf = new Configuration();
        // conf.set("fs.defaultFS", "hdfs://hadoop01:8020");
        conf.set("hadoop.security.authentication", "Kerberos");
        UserGroupInformation.setConfiguration(conf);
        UserGroupInformation.loginUserFromKeytab(user, keytab);
        listDir(conf, dir);
    }

    public static void listDir(Configuration conf, String dir) throws IOException {
        FileSystem fs = FileSystem.get(conf);
        FileStatus files[] = fs.listStatus(new Path(dir));
        for (FileStatus file : files) {
            System.out.println(file.getPath());
        }
    }

Exception in thread "main" java.io.IOException: Login failure for hdfs from keytab /data/soft/kerberos/hdfsaadd.keytab
        at org.apache.hadoop.security.UserGroupInformation.loginUserFromKeytab(UserGroupInformation.java:891)
        at com.security.HdfsSecurityDemo.test1(HdfsSecurityDemo.java:64)
        at com.security.HdfsSecurityDemo.main(HdfsSecurityDemo.java:50)
Caused by: javax.security.auth.login.LoginException: Unable to obtain password from user


        at com.sun.security.auth.module.Krb5LoginModule.promptForPass(Krb5LoginModule.java:856)
        at com.sun.security.auth.module.Krb5LoginModule.attemptAuthentication(Krb5LoginModule.java:719)
        at com.sun.security.auth.module.Krb5LoginModule.login(Krb5LoginModule.java:584)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at javax.security.auth.login.LoginContext.invoke(LoginContext.java:762)
        at javax.security.auth.login.LoginContext.access$000(LoginContext.java:203)
        at javax.security.auth.login.LoginContext$4.run(LoginContext.java:690)
        at javax.security.auth.login.LoginContext$4.run(LoginContext.java:688)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.login.LoginContext.invokePriv(LoginContext.java:687)
        at javax.security.auth.login.LoginContext.login(LoginContext.java:595)
        at org.apache.hadoop.security.UserGroupInformation.loginUserFromKeytab(UserGroupInformation.java:882)
        ... 2 more