ExecuteQuery() error with MySQL

Question

I have already followed all the steps recommended by OTN to create a connection with MySQL (most up-to-date files) in JDeveloper 10g. It works fine except when I try to find a view and execute a query using an Application Module in a jsp:
ApplicationModule appMod = appMod.getGenericAppMod();
ViewObject voTabEmployee = appMod.findViewObject("TabEmployee");
voTabEmployee.executeQuery();
It works ok when connected to Oracle DB but it raises the following exception when I move Business Components to a MySQL connection, exactly as recommended:
java.lang.ClassCastException: com.mysql.jdbc.ServerPreparedStatement
Any help would be highly appreciated.
Marcio

Answer 1

Hi Marcio
The ApplicationModule that you create in your source (utilApp.java) is created using the default configuration that uses the OracleSQLBuilder as the default SQLBuilder (configured to work with Oracle Databases). Thus, when you use MySQL or any other database (and I confirmed this using SQLServer), a ClassCastException is thrown.
Instead of using the following lines:
Context ic = new InitialContext(env);
String theAMDefName = "mysysjcom.MySysJComModule";
ApplicationModuleHome home = (ApplicationModuleHome) ic.lookup(theAMDefName);
ApplicationModule appMod = home.create();
appMod.getTransaction().connectToDataSource(null, "jdbc/MYSYSJCOMCoreDS", false);
can you use the following lines:?
Context ic = new InitialContext(env);
String theAMDefName = "mysysjcom.MySysJComModule";
ApplicationModule appMod = Configuration.createRootApplicationModule(theAMDefName, <config_name>);
ic.lookup(theAMDefName);
I got your sample working with the above change
This will ensure that you are using the same configuration that has the SQLBuilder correctly set to your Database type
Thanks
Prasanth