Hi, I want to know what is the different of this code when compiling
and execute in GAE.
<%
EntityManager em = EMF.getInstance().createEntityManager();
List<User> users = (List<User>) em.createQuery(
"SELECT FROM " + User.class.getName()).getResultList();
request.setAttribute("rs", users);
em.close();
%>
<display:table requestURI="displaytag.jsp" name="rs" export="true"
sort="list" pagesize="10" class="display">
<display:column property="id" title="User ID" sortable="true"
headerClass="sortable" />
<display:column property="name" title="User Name" sortable="true"
headerClass="sortable" />
<display:column property="gender" title="Gender" />
<display:column property="aboutYou" title="About You" />
<display:column property="country" title="Country" />
<display:column property="mailingList" title="JOIN?" />
</display:table>
The above code is giving error code HTTP 500. However, when I change
to
<%
EntityManager em = EMF.getInstance().createEntityManager();
List<User> users = (List<User>) em.createQuery(
"SELECT FROM " + User.class.getName()).getResultList();
request.setAttribute("rs", users);
// em.close(); // just comment this line and move it down
%>
<display:table requestURI="displaytag.jsp" name="rs" export="true"
sort="list" pagesize="10" class="display">
<display:column property="id" title="User ID" sortable="true"
headerClass="sortable" />
<display:column property="name" title="User Name" sortable="true"
headerClass="sortable" />
<display:column property="gender" title="Gender" />
<display:column property="aboutYou" title="About You" />
<display:column property="country" title="Country" />
<display:column property="mailingList" title="JOIN?" />
</display:table>
<%
em.close();
%>
Then the JSP is running and show the result in displaytag table.
Anyone can explain why?
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