JAAS Java LoginContext UserGroupInformation

package test;

import java.io.IOException;

import javax.security.auth.Subject;
import javax.security.auth.login.LoginContext;
import javax.security.auth.login.LoginException;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.security.UserGroupInformation;

public class GetTest2 {


/* JAAS.CONF
com.sun.security.jgss.krb5.initiate {
    com.sun.security.auth.module.Krb5LoginModule required
    doNotPrompt=true
    principal="[email protected]"
    useKeyTab=true
    keyTab="./conf/devp.keytab"
    storeKey=false
    debug=false
    useTicketCache=false;
};
*/

    public static void main(String[] args) throws IOException, LoginException {

        if(args.length != 6){
            System.out.println(String.join(",", args));
            System.out.println("Classpath Jars found from: export jars=$(hadoop classpath):($hbase classpath)");
            System.out.println("Usage: /usr/jdk64/jdk1.8.0_60/bin/java -cp $jars:FSHBaseTEST.jar test.GetTest2 HDFSFolder HBaseTable HBaseKey HBaseColFam HBaseCell HBaseVal");
            System.out.println("conf/ folder should contain jaas.conf, hbase-site.xml, core-site.xml, hdfs-site.xml");
            return;
        }

        System.out.println();
        System.setProperty("sun.security.krb5.debug", "false");
        System.setProperty("java.security.auth.login.config", "./conf/jaas.conf");
        System.setProperty("javax.security.auth.useSubjectCredsOnly", "false");
        System.setProperty("java.security.krb5.conf", "./conf/krb5.conf");

        LoginContext context = new LoginContext("com.sun.security.jgss.krb5.initiate");
        context.login();
        Subject subject = context.getSubject();

        Configuration conf = new Configuration();
        conf.addResource(new Path("./conf/hdfs-site.xml"));
        conf.addResource(new Path("./conf/core-site.xml"));
        conf.addResource(new Path("./conf/hbase-site.xml"));


        UserGroupInformation.setConfiguration(conf);
        UserGroupInformation.loginUserFromSubject(subject);

        System.out.println("NAME -> " + conf.get("dfs.namenode.http-address"));
        System.out.println("SECURITY -> " + conf.get("hadoop.security.authentication"));
        System.out.println("defaultFS -> " + conf.get("fs.defaultFS"));

        FileSystem fs = FileSystem.get(conf);
        RemoteIterator<LocatedFileStatus> lfs = fs.listFiles(new Path(args[0]), false);

        while (lfs.hasNext()){
            System.out.println(lfs.next().getPath());
        }

        //HBASE TEST
        Connection connection = ConnectionFactory.createConnection(conf);
        Table table = connection.getTable(TableName.valueOf(args[1]));
        Put pp = new Put(Bytes.toBytes(args[2]));
        pp.add(Bytes.toBytes(args[3]), Bytes.toBytes(args[4]), Bytes.toBytes(args[5]));
        table.put(pp);


        Get g = new Get(Bytes.toBytes(args[2]));
        Result result = table.get(g);
        //System.out.println(result.toString());
        byte[] value = result.getValue(Bytes.toBytes(args[3]), Bytes.toBytes(args[4]));

        // Printing the values
        String stuff = Bytes.toString(value);
        System.out.println("stuff " + stuff);

    }




}