Trying to pass Oracle array/object type to Java

I have a Java class with two inner classes that are loaded into Oracle:
public class PDFJ
    public static class TextObject
        public String font_name;
        public int font_size;
        public String font_style;
        public String text_string;
    public static class ColumnObject
        public int left_pos;
        public int right_pos;
        public int top_pos;
        public int bottom_pos;
        public int leading;
        public TextObject[] column_texts;
}I have object types in Oracle as such that bind to the Java classes:
CREATE OR REPLACE TYPE "PROGRAMMER"."PDFJ_TEXT" AS OBJECT
EXTERNAL NAME 'PDFJ$TextObject'
LANGUAGE JAVA
USING SQLData(
"FONT_NAME" VARCHAR2(25) EXTERNAL NAME 'font_name',
"FONT_SIZE" NUMBER EXTERNAL NAME 'font_size',
"FONT_STYLE" VARCHAR2(1) EXTERNAL NAME 'font_style',
"TEXT_STRING" VARCHAR2(4000) EXTERNAL NAME 'text_string'
CREATE OR REPLACE TYPE "PROGRAMMER"."PDFJ_TEXT_ARRAY" AS
TABLE OF "PROGRAMMER"."PDFJ_TEXT";
CREATE OR REPLACE TYPE "PROGRAMMER"."PDFJ_COLUMN" AS OBJECT
EXTERNAL NAME 'PDFJ$ColumnObject'
LANGUAGE JAVA
USING SQLData(
"LEFT_POS" NUMBER EXTERNAL NAME 'left_pos',
"RIGHT_POS" NUMBER EXTERNAL NAME 'right_pos',
"TOP_POS" NUMBER EXTERNAL NAME 'top_pos',
"BOTTOM_POS" NUMBER EXTERNAL NAME 'bottom_pos',
"LEADING" NUMBER EXTERNAL NAME 'leading',
"COLUMN_TEXTS" "PROGRAMMER"."PDFJ_TEXT_ARRAY" EXTERNAL NAME 'column_texts'
CREATE OR REPLACE TYPE "PROGRAMMER"."PDFJ_COLUMN_ARRAY" AS
    TABLE OF "PROGRAMMER"."PDFJ_COLUMN";
/I successfully (as far as I know) build a PDFJ_COLUMN_ARRAY object in a PL/SQL procedure. The PDFJ_COLUMN_ARRAY contains PDFJ_COLUMN objects; each of those objects contains a PDFJ_TEXT_ARRAY of PDFJ_TEXT objects (Example: pdf_column_array(i).pdf_text_array(i).text_string := 'something';). In this procedure, I pass this PDFJ_COLUMN_ARRAY as a parameter to a Java function. I assume the Java function parameter is supposed to be a oracle.sql.ARRAY object.
I cannot figure out how to decompose this generic ARRAY object into a ColumnObject[] array. I also tried Googling and searching the forums, but I can't figure out matching search criteria. I was wondering if anyone here knows anything about passing user-defined Oracle type objects to a Java function and retrieving the user-defined Java class equivalents that they are supposedly mapped to--especially a user-defined array type of user-defined object types containing another user-defined array type of user-defined object types.

Ok. I will try asking on the JDBC forum. So, don't
flame me for cross-posting. :PWe won't, if over there you just post basically a
link to this one.
sigh Guess what, he did it the flame-deserving way. It's crossposted at:
http://forum.java.sun.com/thread.jspa?threadID=602805
<flame level="mild">Never ceases to amaze me how people don't think that posting a duplicate rather than a simple link isn't wasteful, as people could end up answering in both of them, not seeing each other's answers</flame>

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TYPE TESTTYPE1 AS object (student1 TESTTYPE,student2 TESTTYPE,student3 TESTTYPE);
TYPE rect AS OBJECT
-- The type has 3 attributes.
length NUMBER,
width NUMBER,
area NUMBER,
-- Define a constructor that has only 2 parameters.
CONSTRUCTOR FUNCTION rect(length NUMBER, width NUMBER)
RETURN SELF AS RESULT
PROCEDURE G(obj1 in TESTTYPE1,obj2 out rect) as
n1 testtype;
n2 testtype;
n3 testtype;
n4 testtype;
begin
obj2 := NEW rect(10,20,200);
n1 := obj1.student1;
n2 := obj1.student2;
n3 := obj1.student3;
obj2.length :=20;
end;
=====================================================
I am not able to call the procedure in java code as I cannot figure out which out parameter type will it be registered using registeroutparameter. using cursor or struct type fails.
please let me know how I can pass values from stored procedure with objects to java.

I'm not sure what you're trying to accomplish with your procedure, but in general, this is an example of how you could use oracle.sql.STRUCT.
First, prepare your java.sql.CallableStatement using java.sql.CallableStatement cStmt = java.sql.Connection.prepareCall({ call G(?, ?) });
Note that you don't have to use the OracleCallableStatement. The java.sql.CallableStatement will work just fine.
For the IN parameter, you need to create three TEST_TYPE objects. Then you need to create one TESTTYPE1 object.
These will all be instances of oracle.sql.STRUCT.
To create a oracle.sql.STRUCT object you need a descriptor and a set of attributes. For example, to create a TEST_TYPE object you would do the following
1. StructDescriptor sd = StructDescriptor.createDescriptor("TEST_TYPE", java.sql.Connection).
2. Add a VARCHAR2 attribute to an array of attributes (e.g. Object[] attributes = new Object[]{"Student Name"})
3. oracle.sql.STRUCT struct = new oracle.sql.STRUCT(sd, java.sql.Connection, attributes)
Then do something similar to create the TESTTYPE1 object, except that the attribute array will contain three instances of TEST_TYPE struct objects.
To bind the IN parameter you need to use the java.sql.CallableStatement.setObject(1, <Instance of TESTTYPE1 object>).
To register the OUT parameter, you need to call java.sql.CallableStatement.registerOutParameter(2, oracle.jdbc.OracleTypes.STRUCT, "RECT").
Then, execute your procedure using cStmt.execute();
Retrieve your OUT parameter using oracle.sql.STRUCT struct = (oracle.sql.STRUCT)cStmt.getObject(2).
Once you've done that, to get the values of the attributes of all of your STRUCT objects, you need their descriptors and their metadata.

Trying to pass Oracle array/object type to Java

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