public void nullSafeSet(PreparedStatement st, Object value, int index)
  throws HibernateException, SQLException{
    st.setBlob(index, Hibernate.createBlob((byte[]) value));
  }

package 1;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Types;
import java.sql.Blob;
import net.sf.hibernate.Hibernate;
import net.sf.hibernate.UserType;
import net.sf.hibernate.HibernateException;

public class blob implements UserType{

  public int[] sqlTypes(){
    return new int[] { Types.BLOB };
  }

  public Class returnedClass(){
    return byte[].class;
  }

  public boolean equals(Object x, Object y){
    return (x == y)
      || (x != null
        && y != null
        && java.util.Arrays.equals((byte[]) x, (byte[]) y));
  }

  public Object nullSafeGet(ResultSet rs, String[] names, Object owner)
  throws HibernateException, SQLException{
    Blob blob = rs.getBlob(names[0]);
    return blob.getBytes(1, (int) blob.length());
  }

  public void nullSafeSet(PreparedStatement st, Object value, int index)
  throws HibernateException, SQLException{
    st.setBlob(index, Hibernate.createBlob((byte[]) value));
  }
public Blob toBlob(Object f){
  Blob b=null;
  b=Hibernate.createBlob((byte[]) f);
  return b;
}
  public Object deepCopy(Object value){
    if (value == null) return null;
    byte[] bytes = (byte[]) value;
    byte[] result = new byte[bytes.length];
    System.arraycopy(bytes, 0, result, 0, bytes.length);
    return result;
  }

  public boolean isMutable(){
    return true;
  }
}

     JFileChooser fc = new JFileChooser();
     int retour = fc.showOpenDialog(this);
     File a=fc.getSelectedFile();
     Object c=new Object();
     c=(Object) a;
     if (retour == fc.APPROVE_OPTION) {
       nullSafeSet(PrepStmt, c, 1);
     }
   }