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Java Java Objects (Retired) Creating the MVP Remaining Characters

I am getting a java.lang.reflect.InvocationTargetException when trying to return a substring of a String object

Java Objects last challenge, step 2 of 2 asks to return the remaining characters from a "Tweet". Can't seem to find the bug. Any pointers?

public class Tweet {
 private String mText;
  public static final int MAX_NUM_CHARS = 140;

  public Tweet(String text) {
    mText = text;

  public String getText() {
    return mText;

  public String getCharsAvail(){
   int txtLength = 0;
   txtLength =  mText.length() - MAX_NUM_CHARS;
    return mText.substring (0,txtLength);


Never mind! I realized that this is asking to return the remaining length of the text. The way the question was worded I thought it was asking to return the remaining characters...

1 Answer

Simon Coates
Simon Coates
28,694 Points

Following seems to pass challenge

public int getCharsAvail(){
   return  Tweet.MAX_NUM_CHARS - mText.length();