Display hashmap key in jstl - jstl

Question

I have tried so many different ways to display this contents of the hashmap based on a key and i would like to be told if im doing it the wrong way please?
session.setAttribute("AvailableLessons", availableLessons.getLessons());
<c:forEach var="temp" items="${sessionScope.AvailableLessons}">
<tbody>
<tr>
<form action="" method="POST">
<td>
<c:out value="${temp['description']}"/>
</td>
<td>
Bean code:
public class LessonTimetable implements Serializable {
private Connection connection = null;
private ResultSet rs = null;
private PreparedStatement st = null;
private Map lessons = new HashMap<String, List<Lesson>>();
private DataSource ds = null;
public Lesson less;
public LessonTimetable() {
// You don't need to make any changes to the try/catch code below
try {
// Obtain our environment naming context
Context initCtx = new InitialContext();
Context envCtx = (Context) initCtx.lookup("java:comp/env");
// Look up our data source
ds = (DataSource) envCtx.lookup("jdbc/LessonDatabase");//change to LessonDatabase..will also have to setup credentials for my virtualmin server account.
} catch (Exception e) {
System.out.println("Exception message is " + e.getMessage());
}
try {
Class.forName("com.mysql.jdbc.Driver");
connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "");
try {
if (connection != null) {
// TODO instantiate and populate the 'lessons' HashMap by selecting the relevant infromation from the database
List<String> putDescriptions = new ArrayList<String>();
List<String> putDates = new ArrayList<String>();
List<String> putStartTime = new ArrayList<String>();
List<Integer> Level = new ArrayList<Integer>();
List<String> LessonID = new ArrayList<String>();
List<String> endTime = new ArrayList<String>();
String query = String.format("SELECT description,level,startDateTime,endDateTime,lessonid FROM LESSONS");
st = connection.prepareStatement(query);
rs = st.executeQuery();
connection.setAutoCommit(false);
st.setFetchSize(0);
while (rs.next()) {
String getDescription = rs.getString("description");
int level = rs.getInt("level");
Timestamp startDate = rs.getTimestamp("startDateTime");
Timestamp endDate = rs.getTimestamp("endDateTime");
String LessonId = rs.getString("lessonid");
this.less = new Lesson(getDescription, startDate, endDate, level, LessonId);
putDescriptions.add(less.description);
putStartTime.add(less.startTime);
endTime.add(less.endTime);
List list = Arrays.asList(less.date.split("2010"));
for (int i = 0; i < list.size(); i++) {
putDates.add(list.get(i).toString());
Level.add(less.level);
LessonID.add(less.ID);
this.lessons.put("description", putDescriptions);
this.lessons.put("StartDate", putDates);
this.lessons.put("StartTime", putStartTime);
this.lessons.put("EndTime", endTime);
this.lessons.put("Level", Level);
this.lessons.put("LessonID", LessonID);

Answer 1

If I understand correctly, availableLessons.getLessons()returns a Map, containing "description" as a key.
Your code starts with session.setAttribute("AvailableLessons", availableLessons.getLessons());. So the attribute AvailableLessonscontains a Map.
So, all you need to access the value associated to the key "description" in that Map is
${AvailableLessons['description']}
No need for a loop, just like in Java you would only need
availableLessons.get("description")
to access this value, without any need for a loop.