What is wrong with my Insert Method using PreparedStatement ?

[tangara]

Dear expert,

I would like to know if the below method and my Post servlet is there is any error cos no matter how I tried, the data just would not go into the database

public void insertSubject(subject s) throws MyDataException { 
		try {									
			openConnection();	
			connection.setAutoCommit(false);
			String qry = INSERT_QRY1;				
	        ps = connection.prepareStatement(qry);	       
	        List<subject>subjects = new LinkedList<subject>();			
			String[] subject = subjects.toArray(new String[subjects.size()]);
	        for( int i = 0 ; i < subject.length; i++ ) {	            
	        s.getSubjects();	           
	        ps.setObject(i + 1, subject[i]);	   
	        ps.executeUpdate();
	        connection.commit();
			closeConnection();
	        	}}
				catch (SQLException e) {	
					try {
						connection.rollback();
					} catch (SQLException e1) {
						// TODO Auto-generated catch block
						e1.printStackTrace();
					 } finally{
						 finalclose();
					 }
				}
			//	throw new MyDataException("DB Error");
				}}


protected void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		response.setContentType("text/html;charset=UTF-8");
		PrintWriter out = response.getWriter();
		tutor m4 = new tutor();		
		manager mgr = new manager();	
		try {
			String name = request.getParameter("name");
			if (name != null){			
			m4.setName(name);				
			String email = request.getParameter("email");
			m4.setEmail(email);
			String address = request.getParameter("address1");
	                m4.setAddress(address);
	String contactNo = request.getParameter("contactNo");
			m4.setContactNo(contactNo);
			Integer age = Integer.parseInt(request.getParameter("age"));
			m4.setAge(age);
			String gender = request.getParameter("Gender");
			m4.setGender(gender);			
			mgr.insertTutor(m4);
			subject m1 = new subject();
			//mgr.insertSubject(m1);			
			try{
			List<subject>subjects = new LinkedList<subject>();			
			String[] subject = subjects.toArray(new String[subjects.size()]);
			subject = request.getParameterValues("subject");
			for (int i = 0; i< subjects.size(); i++){
	        m1.setSubjects1(subject[i]);
	        i++;	        
	        mgr.insertSubject(m1);		        
	        String result1 = subject[i];
	        out.println(result1 + " ");
	       	out.println("Successful registration");
			}}catch (Exception ex) {
				// TODO Auto-generated catch block
				ex.printStackTrace();			
				}