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POCommunication errors and alert box in Vaadin
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  1. POCommunication errors and alert box in Vaadin
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    copied!<p>My web application is using Vaadin 6.8.8 version with vaadin-xs addon and it's deployed on a glassfish server.</p> <p>My application randomly (well, I think it's randomly) gets <em>communication problem</em> and/or <em>session expired</em> messages. Nothing is shown in the log. Sometimes I can see an <em>Invalid security key received from localhost</em> error log, but I'm not sure if it's related to the same issue.</p> <p>I see these problems in Firefox and Chrome (I didn't try it in IE or Opera). In Chrome browser appears infrequently but in Firefox appears frequently.</p> <p>I overrided the <em>getSystemMessages</em> method:</p> <pre><code>public static SystemMessages getSystemMessages() { CustomizedSystemMessages m = new CustomizedSystemMessages(); m.setCommunicationErrorCaption(null); m.setCommunicationErrorMessage(null); m.setCommunicationErrorURL(null); m.setSessionExpiredCaption(null); m.setSessionExpiredMessage(null); m.setSessionExpiredURL(null); return m; } </code></pre> <p>Now, I don't see any <em>communication problem</em> or <em>session expired</em> messages, instead I get a JavaScript standard alert box with <em>Server Error</em> message, then the page is reloaded. This alert box only appears in Firefox browser, in Chrome broswer the alert box doesn't appear.</p> <p>Can someone give me any clue? Some workarround to not show the alert box.</p> <p><strong>Edit:</strong></p> <p>Sometimes I found this stacktrace in the log file:</p> <pre><code>Terminal error: java.lang.ArrayIndexOutOfBoundsException: 1 at com.vaadin.terminal.gwt.server.AbstractCommunicationManager.handleVariableBurst(AbstractCommunicationManager.java:1376) at com.vaadin.terminal.gwt.server.AbstractCommunicationManager.handleVariables(AbstractCommunicationManager.java:1329) at com.vaadin.terminal.gwt.server.AbstractCommunicationManager.doHandleUidlRequest(AbstractCommunicationManager.java:761) at com.vaadin.addons.xs.server.JsonpCommunicationManager.doHandleUidlRequest(JsonpCommunicationManager.java:142) at com.vaadin.terminal.gwt.server.CommunicationManager.handleUidlRequest(CommunicationManager.java:325) at com.vaadin.terminal.gwt.server.AbstractApplicationServlet.service(AbstractApplicationServlet.java:501) at com.vaadin.addons.xs.server.XSApplicationServlet.service(XSApplicationServlet.java:97) at javax.servlet.http.HttpServlet.service(HttpServlet.java:770) at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1550) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161) at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231) at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317) at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195) at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:860) at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:757) at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1056) at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:229) at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137) at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104) at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90) at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79) at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54) at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59) at com.sun.grizzly.ContextTask.run(ContextTask.java:71) at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532) at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513) at java.lang.Thread.run(Thread.java:619) </code></pre>
 

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