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    <p>session in GWT is similar to session in servlet. The difference is in servlet you call <br><code>HTTPSession session = request.getSession();</code> <br></p> <p>in gwt you call <br><br> <code>HttpServletRequest request = this.getThreadLocalRequest();</code> to get request and then again <code>request.getSession();</code><br></p> <p>in your situation you should call RPC when click the button and manage the session on server the previous code and call another RPC when clicking another button and invalidate session. Here is example;</p> <pre><code>Button b1 = new Button("b1"); b1.addClickHandler(new ClickHandler) { // call RPC and // session = this.getThreadLocalRequest().getSession(); // session.setAtribute("b", "1"); } Button b2 = new Button("b2"); b1.addClickHandler(new ClickHandler) { // call RPC and // session = this.getThreadLocalRequest().getSession(); // session.invalidate(); // kill session } </code></pre> <p>This link maybe helpful to you <a href="http://developerlife.com/tutorials/?p=230" rel="noreferrer">Using Servlet Sessions in GWT</a></p> <p><strong>Edit :</strong></p> <p>If you want to test whether the session <code>isExist()</code> or not try this</p> <p>add to your interface <code>boolean test(String attr);</code> <br> add to your .async add <code>void test(String attr, AsyncCallback&lt;Boolean&gt; callback);</code> <br> add to your .impl </p> <pre><code>@Override public boolean test(String attr) { return session.getAttribute(attr) != null; } </code></pre> <p>and just call </p> <pre><code>Rpc.test(attribute, new AsyncCallback&lt;Boolean&gt;() { @Override public void onSuccess(Boolean result) { // here is the result if(result){ // yes the attribute was setted } } @Override public void onFailure(Throwable caught) { Window.alert(caught.getMessage()); } }); </code></pre>
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    1. COHi hilal, thank for your response... but I don't understand a thing: HttpSession httpSession = getThreadLocalRequest().getSession() must be included in the "impl" server-side right? If not too much trouble, could you give me an example of the "RPC call" buttons within? Thanks
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    2. COfor example...I have interface "MySession", "MySessionAsync" in the client-side, and I have "MySessionImpl" in server-side. What should I put in these containers?
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    3. COyes it must be included in the "impl". you can't do it on client-side. For every server actions you should call rpc
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