No Way To Do An Insert With JDBC?

I started with a simple insert on one of my tables. It throws an exception for trying to place NULL in one of two calculated fields in the table.
I then tried setting up a simple stored procedure and calling it using:

CallableStatement statement = con.prepareCall("? = call dbo.AddSignedForms");
statement.registerOutParameter(1, java.sql.Types.INTEGER);
statement.execute();


Which generates this exception:
com.microsoft.sqlserver.jdbc.SQLServerException: Incorrect syntax near '@P0'.

of course there is no such expression in any of the code.

I then set up a simple two column table called tblTestJDBC. now i'm getting this error:
com.microsoft.sqlserver.jdbc.SQLServerException: Invalid object name 'dbo.tblTestJDBC'.

Btw we DID manage to get a simple select statement to work from my applet. Nothing else has. Is this the MS JDBC driver? Should I just avoid using it or are we missing something here?