Getting a run time error for the problem : Password Cracking

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Getting a run time error for the problem : Password Cracking

this is my code…

import java.io.BufferedReader;

import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Scanner;

class Password
{
public int x,l=0,m=0;
public String s[];
public int t[],pl,plA[];
public char t1[],t2[],t3[];
public int y,w,temp=0,temp2=0;

public Password() throws IOException
{
	Scanner in=new Scanner(System.in);
	BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
	x=in.nextInt();
	s=new String[2*x];
	t=new int[x];
	for(int i=0;i<2*x;i++)
	{
		try{s[i]=(String)br.readLine();}
		catch(Exception e){System.out.println();}
		if(s[i].length()<1)
		{
			if(i%2==0)
				l++;	
			else
				m++;
		}
	}
	

	if(l==0 && x<=50 && m==0)
	{
	for(int i=0;i<x;i++)
	{
		if(s[2*i].matches("(.*)"+s[2*i+1]+"(.*)"))
			t[i]=0;				
	}
	
	for(int i=0;i<x;i++)
	{
		pl=(s[2*i].length()-s[2*i+1].length()+1);
		plA=new int[pl];
		for(int j=0; j<pl;j++)
		{
				y=s[2*i].length(); w=s[2*i+1].length();
				t3=new char[y];  t3=s[2*i].toCharArray();
				t1=new char[w];
				
				temp=0;
				//System.out.println("---->"+j+"--->"+i);
				for(int p=j;p<j+w;p++)
				{
					//System.out.println(temp);
					t1[temp]=t3[p];
					temp++;
				}	
				
					
				t2=new char[w];  t2=s[2*i+1].toCharArray();
				temp2=0;
				//System.out.println(t1); System.out.println(t2);
					for(int k=0;k<w;k++)
					{
						if(t1[k]==t2[k])
								temp2++;
					}
				plA[j]=w-temp2;	
				//System.out.println("###"+plA[j]);
				temp2=0;
				
		}
		//System.out.println("plA  ");
		//System.out.println(Arrays.toString(plA));
		t[i]=minA(plA);
	}
	
	System.out.println(" ");
	for(int i=0; i<x;i++)
	{
		System.out.println(t[i]);
	}
	
	}//end of if
	
	else
	{
		System.out.println("Error exist in the input");
	}
	
	
}


public int minA(int A[])
{
	int min=A[0];
	for(int i=1;i<A.length;i++)
	{
		if(A[i]<min)
			min=A[i];
	}
	return min;
}

public static void main(String[] args)
{
	try{
	new Password();}
	catch (Exception e) 
	{System.out.println("Exception Occured....");}
}

}