Why do I get an error when populating and assembling my 2d array Matrix?

When Im trying to take a String and throw it into an array by putting the build method inside the print method but when I do I get the following errors:

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 1
at polycipher.CipherKey.printMatrix(CipherKey.java:27)
at polycipher.CipherKey.assembleMatrix(CipherKey.java:17)
at polycipher.ApplicationDriver.main(ApplicationDriver.java:23)

I was wondering what I'm doing wrong here? I'm pretty sure you can call a method within a method, is there something wrong with my codes logic? I tryed adding -1 to pretty much everywhere that I thought could cause an array out of bounds but no luck.

import java.util.*;

import polycipher.Matrix;

public class CipherKey {

Scanner write = new Scanner (System.in);
Matrix polyCipher = new Matrix();

private final char[] PHRASE_KEY = { 'J', 'A', 'V', 'A'};
String[][] matrixStore = new String[PHRASE_KEY.length][PHRASE_KEY.length];
public void assembleMatrix()  { 

    matrixFormatter(polyCipher.translation);
    System.out.println(polyCipher.translation);
    printMatrix(buildeMatrix(polyCipher.translation,"|",","));

}


public String printMatrix(String s [][]){
    String keyOut = "  J A V A\n";
    for (int i = 0; i < PHRASE_KEY.length; i++) {
        keyOut += PHRASE_KEY[i] + " ";
        for (int j = 0; j < PHRASE_KEY.length; j++) {
            keyOut += s[i][j] + " ";
        }
        keyOut += "\n";
    }
    return keyOut;
}

public static String [][] buildeMatrix (String translation, String outermarker, String innermarker) {
    // outerdelim may be a group of characters
    String [] sOuter = translation.split ("[" + outermarker + "]"); 
    int size = sOuter.length;
    // one dimension of the array has to be known on declaration:
    String [][] result = new String [size][]; 
    int count = 0;
    for (String line : sOuter)
    {
        result [count] = line.split (innermarker);
        ++count;
    }
    return result;
}

public String matrixFormatter(String x){

     String resultstr = "";
      int i = 0;
      while(i < x.length()) {
        // If end of string: only add character.
        if (i == x.length() - 1) {
          resultstr += x.substring(i, i + 1);
        } else {
          if ( ((i + 1) % 4) == 0) {
            resultstr += x.substring(i, i + 1)  + "|";
          } else {
            resultstr += x.substring(i, i + 1)  + ",";
          }
        }
        i++;
      }
      return resultstr;

}

}

This is how I call the matrix in my main

    CipherKey Key = new CipherKey();
    Key.assembleMatrix();