Hide logout in main.jsp if not logged in

docs/guides/src/asciidoc/hellomvc.asc

@@ -80,16 +80,18 @@ include::hello-includes/exploring-the-secured-application.asc[]
 
 ==== Displaying the user name
 
-Now that we have authenticated, let's update the application to display the username. Update main.jsp to contain the following snippet:
+Now that we have authenticated, let's update the application to display the username if the user is authenticated. Update main.jsp to contain the following snippet:
 
 .src/main/webapp/WEB-INF/decorators/main.jsp
 [source,html]
 [subs="verbatim,quotes"]
 ----
 <div class="nav-collapse collapse">
-  *<p class="navbar-text pull-right">
-    <c:out value="${pageContext.request.remoteUser}"/>
-  </p>*
+  *<c:if test="${pageContext.request.remoteUser != null}">
+    <p class="navbar-text pull-right">
+      <c:out value="${pageContext.request.remoteUser}"/>
+    </p>
+  </c:if>*
   <ul class="nav">
     <c:url var="inboxUrl" value="/"/>
     <li><a href="${inboxUrl}">Inbox</a></li>
@@ -112,10 +114,12 @@ Now that we can view the user name, let's update the application to allow loggin
 [subs="verbatim,quotes"]
 ----
 <div class="nav-collapse collapse">
-  *<c:url var="logoutUrl" value="/logout"/>
-  <form:form class="navbar-form pull-right" action="${logoutUrl}" method="post">
-    <input type="submit" value="Log out" />
-  </form:form>*
+  *<c:if test="${pageContext.request.remoteUser != null}">
+    <c:url var="logoutUrl" value="/logout"/>
+    <form:form class="navbar-form pull-right" action="${logoutUrl}" method="post">
+      <input type="submit" value="Log out" />
+    </form:form>
+  </c:if>*
   <p class="navbar-text pull-right">
     <c:out value="${pageContext.request.remoteUser}"/>
   </p>