Problems under WrappedCallableStatement

[jj_andrade]

I am trying doing a simple connection by JNDI Datasource below:

***************Code************************
Context ctxt = new InitialContext();
DataSource ds = (DataSource) ctxt.lookup("java:ds/SigomDS");
connection = ds.getConnection();
String sql = "{call pck_aplicacao.up_obterAplicacoes(?)}";
cstmt = connection.prepareCall(sql);
cstmt.registerOutParameter(1, OracleTypes.CURSOR);
cstmt.execute();
ResultSet cursor = ((OracleCallableStatement)cstmt).getCursor(1);
while(cursor.next()){
System.out.println(cursor.getString(3));
}

cursor.close();

*************************End code***************

When i am trying cast "cstmt" to OracleCallableStatement, ocurring the mistake below:
java.lang.ClassCastException: org.jboss.resource.adapter.jdbc.WrappedCallableStatement

However, i use DataSource as shown below, all is right, someone could help me?? Why i cant cast???

************* I dont have problem using the code below *******

OracleDataSource ods = new OracleDataSource();
ods.setDriverType("thin");
ods.setServerName("10.71.225.244");
ods.setDatabaseName("PROJ9i");
ods.setPortNumber(new Integer("1521").intValue());
ods.setUser("sigom");
ods.setPassword("sigom");
connection = ods.getConnection();

[adrian.brock]

http://wiki.jboss.org/wiki/Wiki.jsp?page=JBossHelp
FAQ - getUnderylingStatement()

"I am trying doing a simple connection by JNDI Datasource below"

No you are not. You are trying to use proprietary api.

[jj_andrade]

Ok adrian.
I didnt found out the exactly article at FAQ about it.
What i didnt understand was getUnderylingStatement() give me a Statement, but i need a CallableStatement.
see : http://docs.jboss.com/jbossas/javadoc/3.2.7/connector/org/jboss/resource/adapter/jdbc/WrappedPreparedStatement.html#getUnderlyingStatement()

I also found out at:
http://www.jboss.org/index.html?module=bb&op=viewtopic&t=48562&view=next

while(ps instanceof WrappedStatement)
{
ps = (PreparedStatement)((WrappedStatement)ps).getUnderlyingStatement();
}

I didnt quite understand.

http://wiki.jboss.org/wiki/Wiki.jsp?page=JBossHelp
FAQ - getUnderylingStatement()

"I am trying doing a simple connection by JNDI Datasource below"

No you are not. You are trying to use proprietary api.

[adrian.brock]

FAQ means it has asked many times before.

We don't put every question on the FAQ page it would be pointless.
It would be as long as the documentation (if not longer because you would
have to deal with every braindeath).

CallableStatement instanceof Statement == true