/** *Method called by the menu to gather, transform, and verify user *input to be used in the findFile() recursive method *If the input is valid, the findFile() method is called with the parameter *If the input is invalid, action is taken to ensure valid input */ public static void callFindFilePath() { //lets user know the method has been called and creates Scanner for input System.out.println("callFindFilePath() has been called" + " "); Scanner input = new Scanner(System.in); //declares flag variable for when user does not want to try again boolean tryAgain = true; String findFile = ""; String startDirectory = ""; //while loop that continues until user exits the method while(tryAgain) { try { //prompts user to enter a directory to search for a file in //and sets input to variable answer, also creates File object set to user input System.out.print("Please Enter a Start Path> "); startDirectory = input.nextLine(); File directory = new File(startDirectory); //checks to see if user input is a valid directory or no if(directory.isDirectory()) { //prompts user to enter a file to find paths for System.out.print("Please Enter a File to Find the Paths of> "); findFile = input.nextLine(); File searchFile = new File(findFile); // System.out.println("findFile() has been called"); findFile(searchFile, directory); System.out.println(""); tryAgain = mainMenu(); } //throws argument if user input is not a valid directory else throw new IllegalArgumentException(); } //catches user input not being a valid directory and prompts user to return to main menu or not catch(IllegalArgumentException iae) { System.out.println(startDirectory + " Is Not a Valid Starting Directory, Please Try Again" + " "); tryAgain = mainMenu(); } } } /** *The basic findFile algorithm *This method does not check the parameters and it's only called by *the callFindFilePath() method * *@param targetFileName the file to have its absolute path searched for and printed *@param startPath the starting directory to be searched for targetFileName */ public static void findFile(File targetFileName, File startPath) { //creates File array and populates it with all files in startPath File [] fileArray = startPath.listFiles(); //iterates through fileArray to find matching file to targetfileName for(int i = 0; i < fileArray.length; i++) { // if(fileArray[i].isFile()) if(fileArray[i].getName().matches(targetFileName.getName())) System.out.println(fileArray[i].getAbsolutePath() + " "); // else findFile(targetFileName,fileArray[i]); } }

I keep getting this error:

-----------Options Menu----------- A) Summation B) Isabel's Technique C) Find File Path Q) Quit

Enter Choice> c callFindFilePath() has been called

Please Enter a Start Path> rdty rdty Is Not a Valid Starting Directory, Please Try Again

Would You Like to Return to the Main Menu (Y/N)> C;\\ Please Enter Either Y or N

Would You Like to Return to the Main Menu (Y/N)> n

Please Enter a Start Path> C:\\Windows Please Enter a File to Find the Paths of> BCD findFile() has been called Exception in thread "main" java.lang.NullPointerException: Cannot read the array length because "fileArray" is null at Recursion.findFile(Recursion.java:303) at Recursion.findFile(Recursion.java:312) at Recursion.callFindFilePath(Recursion.java:270) at Client.main(Client.java:56) C:\Users\Noahh\AppData\Local\NetBeans\Cache\14\executor-snippets un.xml:111: The following error occurred while executing this line: C:\Users\Noahh\AppData\Local\NetBeans\Cache\14\executor-snippets un.xml:68: Java returned: 1 BUILD FAILED (total time: 19 seconds)

Please Help