Having exception in accessing a list through JSTL

Question

I'm trying to access to a like this:

I pass to the JSP page

the list through request.setAttribute("list", list);

and try to access

<c:foreach items="${list}" var="element"}>

<li> ${element.name} ${element.price} </li>

</c:foreach>

but I get NumberFormatException. How can I access correctly the list?

Answer 1

If you select only a few columns from a table, JPA will return an array of objects for each row returned. i.e. it will return a List<Object[]> object. If you want to get back a list of Route objects you can write a constructor in the Route class that takes two values(name and pric and set the values appropriately in the constructor. You can then use the constructor in the JPA query like below to get Route objects: select new yourpackage.Route(name, price) from Route

Answer 2

There are two issues in your JSTL:

<c:foreach items="${list}" var="element"}>
    ...
</c:foreach>

1. Its c:forEach not c:foreach.
2. There is one extra } in the end.

It should be like this:

<c:forEach items="${list}" var="element">
     ...
</c:forEach>

---

There are two option. Try any one as per need.

1. If the list contains Object[] then use ${element[0]}
2. If the list contains Route then use ${element['name']} or ${element.name} or ${element.getName()}. Make sure Route class contains name as instance variable with getter & setter methods.