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I am sure you already found the answer but i will answer in case anyone else need to do something similar. Based on your example here, you could have used StringTokenizer:

StringTokenizer st...

This usually means that the soap xml 'sampleRequest' payload expected has been adjusted slightly. So an existing tag or sub tag/field maybe have changed the type of data it stores or they may have...

Can you show us what you have done so far? Please share some of your code to get better support.

You creating local variables here :
int a = keyboard.nextInt(); // FOR TEST I GAVE 3
System.out.println("Donnez un autre entier:");
int b = keyboard.nextInt(); // FOR TEST I GAVE 4

these values...

I see a couple of issues here:

public Book[] arr = new Book[countElements]; You creating your array of 0 length here. Initializing should be done in the constructor like this

public...

You can use the assert keyword to do this:

@Test
public void randomStarter(){ // Set this.currentPlayer to 1 or 2 based on random.
Random randomizer = new Random();
...