Retrieving a UDT object from a Java Stored Procedure

Question

I am really having trouble returning a UDT object (AttributeUDT) from a Java stored procedure. I am using Oracle 8.1.6 and JDeveloper 3.2.2. I have successfully used JPublisher to create the Java source code files for my UDT, now I would like to use that in coordination with my Java stored procedure. I've loaded the Java stored procedure into the database using the Deployment option in JDeveloper. However, when it loads the procedure, it translates the 3rd parameter to an OBJECT type, thus making the stored procedure invalid. I can use SQL Navigator to correct the package by changing the OBJECT reference to AttributeUDT (my UDT data type). Unfortunately, my Java stored procedure still does not work. Any help would be greatly appreciated! Thanks in advance for your time!
In the example below, could anyone please tell me:
1. How do I register the OUT variable for the UDT?
2. Is it correct to use the casted call to getObject to retrieve my UDT object?
3. Is it valid to use the UDT data type in the java stored procedure method signature?
The call to the Java stored procedure:
OracleCallableStatement cs3 = (OracleCallableStatement)conn.prepareCall( "{ call sandbox.getQualifiersV3( ?, ?, ?) }");
cs3.registerOutParameter( 1, Types.VARCHAR);
cs3.registerOutParameter( 2, Types.VARCHAR);
cs3.registerOutParameter( 3, ???????);
cs3.execute();
System.out.println( "ID: " + cs3.getString( 1));
System.out.println( "Prompt: " + cs3.getString( 2));
AttributeUDT attributes = (AttributeUDT)cs3.getObject( 3);
System.out.println( "Table id: " + attributes.getLogicalTableId());
System.out.println( "Element id: " + attributes.getElementId());
cs3.close();
===========================================
The Java stored procedure:
public static void getQualifiersV3( String ids[], String prompts[],
AttributeUDT attributes[]) throws SQLException {
OracleConnection conn = (OracleConnection)new OracleDriver().defaultConnection();
Statement stmt = conn.createStatement();
OracleResultSet rs = (OracleResultSet)stmt.executeQuery(
"SELECT * "
+ "FROM VPS_ABOK_QUALIFIERS "
+ "WHERE qualifier_id = 2001");
rs.next();
ids[0] = rs.getString( 1);
prompts[0] = rs.getString( 2);
attributes[0] = (AttributeUDT)rs.getCustomDatum( 3, AttributeUDT.getFactory());
rs.close();
stmt.close();
null

Answer 1

Sounds like your C2 REF TYP1 attribute may be null. Unfortunately you neglected to say where in your code the NullPointerException occurs.