SQL & PL/SQL

I'm trying below java code but its giving me error:

public class testq {
public static void main(String[] args) throws Exception {
testq q = new testq();

AQSession aq_sess = createSession();
q.runTest(aq_sess);
}

public static AQSession createSession() {
Connection db_conn;
AQSession aq_sess = null;

try {
DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());

/* Load the Oracle8i AQ driver: */
Class.forName("oracle.AQ.AQOracleDriver");

db_conn = DriverManager.getConnection("jdbc:oracle:thin:@10.10.10.10:1521:demo", "demo_app", "demo");

System.out.println("JDBC Connection opened ");
db_conn.setAutoCommit(false);


/* Creating an AQ Session: */
aq_sess = AQDriverManager.createAQSession(db_conn);
System.out.println("Successfully created AQSession ");
}
catch (Exception ex) {
System.out.println("Exception: " + ex);
ex.printStackTrace();
}
return aq_sess;
}

public void runTest(AQSession aq_sess) {
//AQQueueTable q_table;
AQQueue queue;
AQMessage message;
AQRawPayload raw_payload;
AQDequeueOption deq_option;
byte[] b_array;
Connection db_conn;

try {
db_conn = ((AQOracleSession)aq_sess).getDBConnection();

/* Get a handle to a queue - aq_queue4 in aquser schema: */
queue = aq_sess.getQueue ("myadmin", "STREAM_QUEUE_DEMO");
System.out.println("Successful getQueue");

/* Creating a AQDequeueOption object with default options: */
deq_option = new AQDequeueOption();

deq_option.setDequeueMode(AQDequeueOption.DEQUEUE_REMOVE);

/* Set wait time to 10 seconds: */
deq_option.setWaitTime(10);

/* Dequeue a message: */
message = queue.dequeue(deq_option);
System.out.println("Successful dequeue");

/* Retrieve raw data from the message: */
raw_payload = message.getRawPayload();
b_array = raw_payload.getBytes();
db_conn.commit();

String value = new String(b_array);
System.out.println("queue="+value);
} catch(Exception e) {
e.printStackTrace();
}
}

The error says "oracle.AQ.AQException: JMS-174: Class must be specified for queues with object payloads
Use dequeue(deq_option, payload_fact) or dequeue(deq_option, sql_data_cl)"

Can any one tell me how to fix this error & how to get bulk dequeue messages?

And i am using sys.AQ$_JMS_TEXT_MESSAGE payload type during enqueue.

Can any one tell me how to fix this Java program to dequeue it?

Thanks in advance...Please its urgent

Thanks!