uploading file in postgres database using java servlet

java.lang.AbstractMethodError: Method org/postgresql/jdbc3g/Jdbc3gPreparedStatement.setBinaryStream(ILjava/io/InputStream;)V is abstract

<form method="post" action="Upload"  enctype='multipart/form-data'>

         id="onelevel" name="onelevel">
        


         id="twolevel" name="twolevel">
        


          id="threelevel" name="threelevel">
         


          id="fourlevel" name="fourlevel">
         


           id="fivelevel" name="fivelevel">
          




 class="docu" name="docu">

   type="file" name="data"  accept=".doc,.docx,.xml,application/msword,application/vnd.openxmlformats-officedocument.wordprocessingml.document" >
  <button>Uploadbutton>

    

Here is my java code

package fileupload;

import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.sql.Statement;

import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;

import dbConnection
                                                

                                                                                                        
                                                    
                                                
                                                

                                                    

                                                        
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