Problem with function that returns a cursor

I'm new to pgSQL and I'm having some trouble with a
function. I keep getting the following error:

org.postgresql.util.PSQLException: ERROR: cursor
"<unnamed portal 1>" does not exist

This is the function:

CREATE OR REPLACE FUNCTION ret_user(pusername
"varchar")
RETURNS refcursor AS
$BODY$
DECLARE
ccursor refcursor;
BEGIN
open ccursor for
select username,
password,
idrole
from user
where username = quote_literal($1);

RETURN ccursor;
END;
$BODY$
LANGUAGE 'plpgsql' VOLATILE;

This is the JDBC code:

CallableStatement statement = null;
ResultSet rs = null;
Connection connection =
ConnectionPool.getConnection(saJNDI);
try{
statement = connection.prepareCall("{? =
call ret_user(?)");
statement.registerOutParameter(1,
Types.OTHER);
statement.setObject(2, "munoze");
statement.execute();
rs = (ResultSet)statement.getObject(1);
while(rs.next()){
System.out.println(rs.getString(1));
System.out.println(rs.getString(2));
System.out.println(rs.getString(3));
}
rs.close();
statement.close();
} catch(SQLException e){

}

I hope you can help me

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