Using HashMaps in an EJB

WELL I gone through your code in the link

http://forum.java.sun.com/thread.jspa?threadID=5138929&messageID=9509475#9509475

>Well thats the important parts of the code. it works fine when I send >simple messages but when I try out the HashMap the servlet is >displayed but no messages are sent to the queue. It would be great if >anyone could help.

The reason is simple;

THE HASHMAP CONTAIN NULL VALUES AND YOU ARE SENDING NULL TO THE JMS SO NO OUTPUT.

protected void processRequest(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

response.setContentType("text/html;charset=UTF-8");

String title=request.getParameter("title");

System.out.println("TITLE IS:"+title);

String body=request.getParameter("body");

System.out.println("BODY IS:"+body);

HashMap hm = new HashMap();

//hm.put("title", request.getParameter("title"));

//hm.put("body", request.getParameter("body"));

hm.put("title",title );

hm.put("body", body);

if ((title!=null) && (body!=null)) {

try {

Connection connection = connectionFactory.createConnection();

Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);

MessageProducer messageProducer = session.createProducer(queue);

ObjectMessage message = session.createObjectMessage();

// here we create NewsEntity, that will be sent in JMS message

NewsEntity e = new NewsEntity();

e.setTitle(title);

e.setBody(body);

e.setHm(hm);

message.setObject(e);

messageProducer.send(message);

messageProducer.close();

connection.close();

// response.sendRedirect("ListNews");

} catch (JMSException ex) {

ex.printStackTrace();

}

}

try out this code this modified code and allot some dukes if you succeed best of luck :))

cvasu4a at 2007-7-9 22:49:23 >

Hi

That did not work out. I tried replacing it still have the same problem. Anyway I reverted to the original and went through the logs. This is error of any note that comes up when I try to insert into the message Queue

Exception [TOPLINK-4002] (Oracle TopLink Essentials - 2006.8 (Build 060830)): oracle.toplink.essentials.exceptions.DatabaseExceptionInternal Exception: org.apache.derby.client.am.SqlException: Invalid data conversion: Parameter object type is invalid for requested conversion.Error Code: -99999Call:INSERT INTO NEWSENTITY (ID, BODY, HM, TITLE) VALUES (?, ?, ?, ?)bind => [1, ddddd, {body=ddddd, title=Test Message}, Test Message]Query:InsertObjectQuery(ejb.NewsEntity[id=1])

Let me know if that was helpful. Let me know if any of you people think of something.

In any case cvasu4, here are some points for trying to help me. Let me know if you think of something

jomanlka at 2007-7-9 22:49:23 >

Hi jwenting!

I understand that the DB is expecting 4 values but the bean is sending 3 values plues a sort of nested value. But the persistence is handled by the bean itself right ? It checks the GET and SET methods and creates the tables. Since I have just declared it as a Hashmap the bean will be handling how it is stored right ? If this is not the case how do I fix it so that I can store the HashMap in the DB (I want to be able to store the whole Hashmap and not just extract the values and store separately. This is because I want to store a binary stream as well).

Any suggestions? Please keep in mind that Im very new to all this and most of this is Greek to me

jomanlka at 2007-7-9 22:49:23 >