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This afternoon I decided to download and play with Mendix 4.0 since I had gotten very curious about the new features and the new mobile modeler. When I switched back to my Mendix 3.2.1 project, I had a very unpleasant surprise waiting for me. Suddenly I had trouble in every window that contains a horizontal split pane with a datagrid on the left and a dataview on the right with a listen target set to the datagrid. Every time I clicked on a row in the datagrid, I got the error message: " An error has occurred while handling the request " The console showed the following stack trace every time this error occurred: java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Number at gr.a(SourceFile:165) at gr.execute(SourceFile:120) at iI.a(SourceFile:311) at iI.a(SourceFile:240) at iI.processRequest(SourceFile:179) at iL.a(SourceFile:71) at com.mendix.core.MxRuntime.processRequest(SourceFile:856) at com.mendix.m2ee.server.handler.RuntimeHandler.handle(RuntimeHandler.java:43) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:113) at org.eclipse.jetty.server.Server.handle(Server.java:334) at org.eclipse.jetty.server.HttpConnection.handleRequest(HttpConnection.java:559) at org.eclipse.jetty.server.HttpConnection$RequestHandler.content(HttpConnection.java:1007) at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:747) at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:209) at org.eclipse.jetty.server.HttpConnection.handle(HttpConnection.java:406) at org.eclipse.jetty.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:462) at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:436) at java.lang.Thread.run(Thread.java:662) I won't tire you with all the things I tried to find out what the problem was. What I can say is that if you run into this situation and get this error message, try to clean your browser cache. Chances are high the error message will disappear.

asked 2012-05-24

0 answers