Null Pointer when hiding view attribute

Question

Hi,
Attached is my override of doDML of table media. The view object contains fields from tables media and idn. The primary key to both, and the link field is called udid. I try to hide the media.udid but I get a null pointer error.
Do these line (also below) need the primary key of the media table (the table whose doDML the code is located)?
EntityDefImpl home = IdnImpl.getDefinitionObject();
IdnImpl idn = (IdnImpl)home.findByPrimaryKey(getDBTransaction(),getPrimaryKey());
The point of the above code is to grab another field I need for a procedure(from table IDN). When I comment these lines out the error goes away. Procedure doesn't work, but it runs. It seems weird I know to go to another table to capture udid as you can see below, even though it's available to this table instance. The reason I did that (and chose to hide media.udid) is to have a primary key available to table IDN, so as to grab the other field I need (min_val).
ANy thoughts? I haven't hid a view attribute before..
Thanks.
protected void doDML(int operation, TransactionEvent e)
//super.doDML(operation, e);
switch(operation)
case DML_INSERT: {
CallableStatement st = null;
EntityDefImpl home[i]Long postings are being truncated to ~1 kB at this time.

Answer 1

protected void doDML(int operation, TransactionEvent e)
//super.doDML(operation, e);
switch(operation)
case DML_INSERT: {
CallableStatement st = null;
EntityDefImpl home = IdnImpl.getDefinitionObject();
IdnImpl idn = (IdnImpl)home.findByPrimaryKey(getDBTransaction(),getPrimaryKey());
String min_val = idn.getMinVal();
Number udid = idn.getUdid();
try
String stmt = "BEGIN DA_YAMS.MED_INS(?,?); END;";
DBTransaction tr = getDBTransaction();
st = tr.createCallableStatement(stmt,1);
st.setInt(1,udid.intValue());
st.setString(2,getFileName());
st.executeUpdate();
stmt = "BEGIN DA_YAMS.IDN_INS(?,?);END;";
DBTransaction idn_tr = getDBTransaction();
st = idn_tr.createCallableStatement(stmt,1);
st.setInt(1,udid.intValue());
st.setString(2,min_val);
st.executeUpdate();
catch (SQLException s)
throw new JboException(s);