unreported exception parseException

Here is my code

import java.io.* ;
import java.util.*;
import java.text.*;

/*class QS1
{


    String[] buf = new String[50];
    // String[]buf={"select * from emp;"};
}*/

class QS2
{

String type;
     String contents;
     QS2  nestedquery;
     QS2 next;
    String[] buf;



     QS2(String t,String c,QS2 n,QS2 nx){
        type=t;
        contents=c;
        nestedquery=n;
        next=nx;
     }
}


public class GenerateGLL {

    ///private static class generateQueryStrcture {

        //public generateQueryStrcture() {
        //}



   // QS1 qs = new QS1();
     int count = 0 ;
  // static String[] token;

    public static void main(String args[])
    {

    generateQueryStrcture r=new generateQueryStrcture();
        QS2 generateQueryStrcture = r.generateQueryStrcture();

        //FormsPlSql p = new FormsPlSql();
        //String tokens[] = p.parseAndGenerateTokens("select * from emp where name='abc';");

    }

}

class generateQueryStrcture
{
   generateQueryStrcture()
    {

   }
public QS2 generateQueryStrcture() {
        QS2 qs1 = null,qs2 = null,qs3=null;
               // QS2 qs = null;
                //String[] buf = new String[50];

    //String[] tokens = {"select","lid,bid","from","emp","where","emp.id<5 and name='abc'",";"};

                //tail=null;
//tokens[] = { "select * from emp;" };
FormsPlSql t = new FormsPlSql();
        String tokens[] = t.parseAndGenerateTokens("select * from emp where name='abc';");

        int count = 0;
        int i;
        for( i = 0 ;i < tokens.length ; i++){
            if(tokens[i].equalsIgnoreCase("select"))
            {
               qs1 = new QS2("SELECT",null, null, null);

                  count = i;
                   while(!tokens[i].equalsIgnoreCase("from"))
                    {
                    if(tokens[i].equals("("))
                        {

                        }

                    qs1.contents = tokens[i];
                    i++;
                    }
                  qs1.next = qs2;

                    break;


                }
        }

        for( i = count ;i < tokens.length ; i++){
            if(tokens[i].equalsIgnoreCase("from"))
            {
                   qs2 = new QS2("FROM",null, null, null);

                  // handle nesting..
                  count = i;
                   while(!tokens[i].equalsIgnoreCase("where"))
                    {
                    qs2.contents = tokens[i];
                    i++;
                    }

                    qs1.next = qs2;

                    break;


                }

        }


        for( i = 0 ;i < tokens.length ; i++){
            if(tokens[i].equalsIgnoreCase("where"))
            {
                  qs3 = new QS2("WHERE",null, null, null);
// handle nesting..
                  //count = i;
                   while(!tokens[i].equals(";"))
                    {
                    qs3.contents = tokens[i];
                    i++;
                    }

                    qs2.next = qs3;
                    //QS2 tail = new QS2(null, null, null, null);

                    //qs3.next = tail;

                    break;

                }

        }

        qs1.next = qs2;
        qs2.next = qs3;
        QS2 tail = new QS2(null, null, null, null);
        qs3.next = tail;

        for(QS2 q=qs1; q.next!=null; q=q.next){
                System.out.println("Type "+q.type);
                System.out.println("Content : "+q.contents);
                System.out.println("=============");
                }
return qs1;
        }


}


//System.out.println(qs1);