Java.sql.SQLException: Data size bigger than max size for this type: 77835

Question

I'm having this strange SQLException while trying to insert BLOB image data to Oracle database. I'm saying this strange because for the same image that has been inserted before it's throwing the exception. My program is run from Oracle form and then some image data are inserted into database through a loop. I can't realize what's the problem inside my code that's causing this problem. In fact, when I run my program independently not from Oracle Form, it runs fine, every image data get inserted into database. Given below is my code snippet:
public void insertAccDocs(String[] accessions) throws SQLException
    for(int q=0; q<accessions.length; q++)
    final String  docName = accessions[q];
    dbThread = new Thread(new Runnable(){
    public void run()
      try{
      System.out.println("insertDB before connection");
               getConnected();
               System.out.println("insertDB after connection");
               st=con.createStatement();
         //String docName = acc; commented
     // String docName = singleAccession;
               String text = formatFree;
               String qry = "INSERT INTO DOCUMENT VALUES('"+docName+"','"+text+"','"+formatted+"','"+uiid+"')";
               System.out.println("parentqry"+qry);
               int ok=0;
               ok=st.executeUpdate(qry);
               if(ok==1)
            System.out.println("INSERTION SUCCESS= "+ok);
                    System.out.println("Image List Size"+ imgList.size());
            // inserting into child
                    for(int i=0;i<imgList.size(); i++)
                  String imgPath = ""+imgList.get(i);
                              System.out.println("db"+imgPath);
                              FileInputStream fin = new FileInputStream(imgPath);
                              BufferedInputStream bufStr = new BufferedInputStream(fin);
                              byte[] imgByte = new byte[bufStr.available()];
                              String img = "" + imgNameList.get(i);
                              System.out.println("imgid="+i);
            callable = con.prepareCall("{call prc_insert_docimage(?,?,?)}");
            callable.setString(1,docName);
                        callable.setString(2,img);
            callable.setBinaryStream(3, bufStr , (int)imgByte.length);
            callable.execute();
        callable.close();
                 con.commit();
        con.close();
               else
                    System.out.println("INSERTION NOT SUCCESS");
   //   } //else end of severalAcc
               }catch(Exception err){ //try
                    System.out.println(err.toString());
    } //run
  }); //runnable
  dbThread.start();     
}Can someone help me solve this problem?
Regards
Rashed

Answer 1

Hi thanks....would you please make me a bit clear about your suggestions? Where should I move to see the "max packet size allowed to send to server in jdbc driver"? If I want to change this on server side or as one of JDBC connection property, which topic should I look for in Oracle doc...please let me know.
Regards
Rashed