C:forEach tag inside another c:forEach tag

Question

Hi,
I've got en error when I tried to use <c:forEach> inside another <c:forEach> to display a vector of String arrays.
The error message is:
javax.servlet.ServletException: The "." operator was supplied with an index value of type "java.lang.String" to be applied to a List or array, but that value cannot be converted to an integer.
The concerned section of the javabean mybean.java is:
//connect to database to get the resultset
ResultSet rs = cst.getResultSet();
if (rs != null) {
myVector = new Vector();
while (rs.next()) {
String myArray[] = new String[10];
myArray[0]=rs.getString(1);
myArray[1]=rs.getString(2);
myArray[9]=rs.getString(10);
myVector.addElement(myArray);
rs.close()
The concerned jsp calling the bean is:
<jsp:useBean id="theBean" scope="session" class="mybean" />
<jsp:setProperty name="theBean" property="..." />
<%
Vector myVector=theBean.getResultFromDatabaseIntomyVector();
pageContext.setAttribute("myVector",myVector);
%>
<table>
<c:forEach var = 'vectorItem' items='${myVector}'>
<tr>
<c:forEach var = 'arrayItem' items='${vectorItem.value}'>
<td><c out value='${arrayItem}'/></td>
</c:forEach>
</tr>
</table>
Can anyone show me what's the right jsp for displaying a vector of String arrays?
Thanks in advance.
Geraldine

Answer 1

I think your problem is with the second forEach loop.
The first for loop goes through the items in "myVector"
Each item "vectorItem" should be of type String[]
Accessing ${vectorItem.value} is what creates the error.
JSTL converts this as
vectorItem["value"] , can't turn the string "value" into an integer (to use as an array index) and thus throws an error.
To fix: use ${vectorItem} rather than ${vectorItem.value}
(nb you would use {vectorItem.value} if you were iterating over a Map, as the iterator exposes an object of type Map.Entry
Also in your code, I only see one closing tag for a forEach.
I think it should be like this (indented for readability)
<table>
<c:forEach var = 'vectorItem' items='${myVector}'>
<tr>
  <c:forEach var = 'arrayItem' items='${vectorItem}'>
    <td><c out value='${arrayItem}'/></td>
  </c:forEach>
</tr>
</c:forEach>
</table>Cheers,
evnafets