java.lang.IndexOutOfBoundsException

[M Hasan]

I copied line by line from a book there were several error fixed most of them. Now I am stuck.Please help:

public class QuizBean implements Serializable {

     private int currentProblem;
     private int tries;
     private int score;
     private String response = "";
     private String correctAnswer;

     private ArrayList<com.corejsf.Problem> problems = new ArrayList<com.corejsf.Problem>(Arrays.asList(
             new com.corejsf.Problem(
                     "What trademarked slogan describes Java development? Write once, ...",
                     "run anywhere"),
             new com.corejsf.Problem(
                     "What are the first 4 bytes of every class file (in hexadecimal)?",
                     "CAFEBABE"),
             new com.corejsf.Problem(
                     "What does this statement print? System.out.println(1+\"2\");",
                     "12"),
             new com.corejsf.Problem(
                     "Which Java keyword is used to define a subclass?",
                     "extends"),
             new com.corejsf.Problem(
                     "What was the original name of the Java programming language?",
                     "Oak"),
             new com.corejsf.Problem(
                     "Which java.util class describes a point in time?",
                     "Date")));

     public String getQuestion() {
          return problems.get(currentProblem).getQuestion();
     }

     public String getAnswer() {
          return correctAnswer;
     }

     public int getScore() {
          return score;
     }

     public String getResponse() {
          return response;
     }

     public void setResponse(String newValue) {
          response = newValue;
     }
     //-------------------------------------------------------------------------
     public String AnswerAction() {
          tries++;
          if (problems.get(currentProblem).isCorrect(response)) {
               score++;
               nextProblem();
               if (currentProblem == problems.size()) {
                    return "done";
               } else {
                    return "success";
               }
          } else if (tries == 1) {
               return "again";
          } else {
               nextProblem();
               if (currentProblem == problems.size()) {
                    return "done";
               } else {
                    return "failure";
               }
          }
     }//AnswerAction()
     
     public String startOverAction(){
          Collections.shuffle(problems);
          currentProblem = 0;
          score = 0;
          tries = 0;
          response="";
          return "startOver";
     }
     //-------------------------------------------------------------------------
     private void nextProblem(){
          correctAnswer = problems.get(currentProblem).getAnswer();
          currentProblem++;
          tries = 0;
          response="";
     }
}

<?xml version="1.0"?>
<faces-config xmlns="http://java.sun.com/xml/ns/javaee" 
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
      http://java.sun.com/xml/ns/javaee/web-facesconfig_2_0.xsd"
   version="2.0">
   <navigation-rule>
      <navigation-case>
         <from-outcome>startOver</from-outcome>
         <to-view-id>/index.xhtml</to-view-id>
      </navigation-case>
   </navigation-rule>
   <navigation-rule>
      <from-view-id>/again.xhtml</from-view-id>
      <navigation-case>
         <from-outcome>failure</from-outcome>
         <to-view-id>/failure.xhtml</to-view-id>
      </navigation-case>
   </navigation-rule>
   <navigation-rule>
      <navigation-case>
         <from-outcome>failure</from-outcome>
         <to-view-id>/again.xhtml</to-view-id>
      </navigation-case>
   </navigation-rule>

   <application>
      <resource-bundle>
         <base-name>com.corejsf.messages</base-name>
         <var>msgs</var>
      </resource-bundle>
   </application>
</faces-config>

<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:h="http://java.sun.com/jsf/html">
    <h:head>
        <title>#{msgs.title}</title>
    </h:head>
    <h:body>
        
        <h:form>
            <p>#{quizBean.question}</p>
            <p><h:inputText value="#{quizBean.response}"/></p>
            <p><h:commandButton value="#{msgs.checkAnswer}" actionListener="#{quizBean.AnswerAction}"/></p>
        </h:form>
    </h:body>
</html>

I could trace the bug.Please help. The whole code is here: github

[Tim Holloway]

Welcome to the JavaRanch!

Actually, if you could post the server log (stack trace) to this thread it would help a lot.

[M Hasan]

java.lang.IndexOutOfBoundsException: Index: 3, Size: 3
	at java.util.ArrayList.rangeCheck(ArrayList.java:653)
	at java.util.ArrayList.get(ArrayList.java:429)
	at com.jsf.QuizBean.getQuestion(QuizBean.java:36)
	at com.jsf.QuizBean$$OwbNormalScopeProxy0.getQuestion(com/jsf/QuizBean.java)
        .....

[M Hasan]

I solved the issue .