Radio Button not returning value JSP

I am developing a quiz in a JSP and the radio buttons are currently returning NULL instead of the assigned value. How do I fix this?

And yes I am aware that scriptlets should not be used in JSPs but I am unsure of how to resolve this. I will do some research on this later, but for now, I just want to know why the radio buttons are returning NULL.

The System.out.println outputs are just for me to track the values, these will be removed in the final code. I have included the main code just in case there is an error that also needs to be fixed. Apologies for the lack of code commenting, this is a project I had to do extremely quick for homework.

Connection conn = null;
ResultSet rs;
Statement st;
String action;
Scanner input = new Scanner(System.in);
System.out.println("Enter Question ID (int):");
int score = 0;

int QID = Integer.parseInt(input.nextLine());
try {
    Class.forName("org.mariadb.jdbc.Driver");
    System.out.println("Connecting to a selected database...");
    conn = DriverManager.getConnection(
            "jdbc:mariadb://ebs-db.eastbarnetschool.com/Quiz", "Quiz","quiz123");
    System.out.println("Connection made");
    
    CallableStatement stmt = conn.prepareCall("{call QuestionTitle(?, ?)}");
		stmt.setInt(1, QID); 
		stmt.registerOutParameter(2, Types.VARCHAR);
		stmt.execute();
		String description = stmt.getString(2);
		System.out.println(description);
%>
<br>
<br/>
<center>

<table border="1" width="500px" bgcolor="lightblue" cellspacing="0" cellpadding="0">
<tr>
<td width="100%">

<form name="quiz" method="post">

<h1 align="center"><font color="white" face="arial">Quiz</font></h1>
<table border="0" width="500px" cellspacing="2" cellpadding="6">
<tr>
<td width="50%"><font color="steelblue" face="arial" size=4><span style="font-weight:normal"> QUESTION <%=QID%></span></font></td>
<tr>
<td width="100%"><font color="black" face="arial" size=4><span style="font-weight:normal"><%=description%></span></font></td></tr>

<% 
     CallableStatement stmt1 = conn.prepareCall("{call DisplayAnswers(?)}");
	stmt1.setInt(1, QID); 
	rs = stmt1.executeQuery();
	stmt1.execute();
	
	ArrayList<String> answers = new ArrayList<String>();
		
	while(rs.next()) {
		String ADescription = rs.getString("Answer_Description");
		answers.add(ADescription);
		}
		
%>
<tr>
<td>		
1:<input type="radio" name="button" value= "<%=answers.get(0)%>" /><font face="arial" size=3><%=answers.get(0) %></font></td>
	<tr>
	<td>
2: <input type="radio" name="button" value="<%=answers.get(1)%>" /><font face="arial" size=3><%=answers.get(1) %></font></td>
	<tr>
	<td>
3: <input type="radio" name="button" value="<%=answers.get(2)%>" /><font face="arial" size=3><%=answers.get(2) %></font></td>
	<tr>
	<td>
4: <input type="radio" name="button" value="<%=answers.get(3)%>" /><font face="arial" size=3><%=answers.get(3) %></font></td>
	
<tr><td><center><input type="submit" value="Next" name="next"><input type="submit" value="Submit" name="submit"></center></td></tr>	
</table>
</form>		
<%	
System.out.println(answers);		

action = request.getParameter("button");
System.out.println("\n" + action);

if (action == null){
	System.out.println("Please select a button");
}

CallableStatement stmt2 = conn.prepareCall("{call GetCorrectAnswer(?, ?)}");
	stmt2.setInt(1, QID); 
	stmt2.registerOutParameter(2, Types.VARCHAR);
	stmt2.execute();
	String CorrectDescription = stmt2.getString(2);
	System.out.println("\nCorrect Answer: " + CorrectDescription);
	
	System.out.println("\nChosen: " + (request.getParameter("button")));
	
	if(request.getParameterValues("button") != null) {
	   if(correctAnswer.equals(CorrectDescription)) {
	    	out.println("Correct!");
	    	score ++;
	    }
	    
	    else{
	        out.println("Incorrect!");	
	}	

	}

	//System.out.println("Score = "+ score);

Your stored procedure, DisplayAnswers doesn't seem to be correct. It must have OUT parameter(s) if you are expecting to get value(s) from it. Also, make sure to call stmt1.registerOutParameter(2, java.sql.Types.VARCHAR); after correcting the implementation of your stored procedure, DisplayAnswers. Also, if you are using a stored procedure, you should get a value like String answerDescription = stmt1.getString(2);.

However, I recommend you use a PreparedStatement instead of a CallableStatement in this case i.e. form your query something like

SELECT answer_description FROM answers WHERE qid = ?

and then get the resultset after setting the value of the parameter. Check https://docs.oracle.com/javase/tutorial/jdbc/basics/prepared.html for more details.