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    <p>If your <code>SignIn</code> servlet is only saving a request parameter (email), then you could also replace the servlet with a <a href="https://stackoverflow.com/tags/servlet-filters/info">filter</a>, e.g. <code>SignInFilter</code>.</p> <p><code>SignInFilter</code> would contain the same logic as your <code>SignIn</code> servlet (copying the email from the request parameters to the session), but would call the next item in the chain (which will be your <code>ShowOnline</code> servlet) instead of doing any redirect/forward.</p> <pre><code>public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException { HttpServletRequest request = (HttpServletRequest) req; HttpServletResponse response = (HttpServletResponse) res; HttpSession session = request.getSession(); String email = req.getParameter("email"); session.setAttribute("email", email); chain.doFilter(req, res); // continue to 'ShowOnline' } </code></pre> <p>Set up your form to POST to the <code>ShowOnline</code> servlet instead, and configure your new SignInFilter to execute before <code>ShowOnline</code> (servlet mapping omitted below for brevity).</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5"&gt; &lt;filter&gt; &lt;filter-name&gt;SignInFilter&lt;/filter-name&gt; &lt;filter-class&gt;com.example.SignInFilter&lt;/filter-class&gt; &lt;/filter&gt; &lt;filter-mapping&gt; &lt;filter-name&gt;SignInFilter&lt;/filter-name&gt; &lt;url-pattern&gt;/ShowOnline&lt;/url-pattern&gt; &lt;/filter-mapping&gt; &lt;/web-app&gt; </code></pre>
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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