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java.lang.ClassCastException: org.eclipse.swt.layout.GridLayout cannot be cast to org.eclipse.swt.layout.FillData at org.eclipse.swt.layout.FillLayout.flushCache(FillLayout.java:165) at org.eclipse.swt.widgets.Composite.changed(Composite.java:610) at org.eclipse.rwt.internal.textsize.ClearLayoutBuffersVisitor.doVisit(ClearLayoutBuffersVisitor.java:22) at org.eclipse.swt.internal.widgets.WidgetTreeVisitor$AllWidgetTreeVisitor.visit(WidgetTreeVisitor.java:34) at org.eclipse.swt.internal.widgets.WidgetTreeVisitor.accept(WidgetTreeVisitor.java:48) at org.eclipse.swt.internal.widgets.WidgetTreeVisitor.accept(WidgetTreeVisitor.java:55) at org.eclipse.swt.internal.widgets.WidgetTreeVisitor.accept(WidgetTreeVisitor.java:55) at org.eclipse.swt.internal.widgets.WidgetTreeVisitor.accept(WidgetTreeVisitor.java:55) at org.eclipse.swt.internal.widgets.WidgetTreeVisitor.accept(WidgetTreeVisitor.java:55) at org.eclipse.rwt.internal.textsize.TextSizeRecalculation.clearLayoutBuffers(TextSizeRecalculation.java:51) at org.eclipse.rwt.internal.textsize.TextSizeRecalculation.forceShellRecalculations(TextSizeRecalculation.java:36) at org.eclipse.rwt.internal.textsize.TextSizeRecalculation.execute(TextSizeRecalculation.java:29) at org.eclipse.rwt.internal.textsize.MeasurementListener.handleMeasurementResults(MeasurementListener.java:61) at org.eclipse.rwt.internal.textsize.MeasurementListener.afterPhase(MeasurementListener.java:33) at org.eclipse.rwt.internal.lifecycle.PhaseListenerManager.notifyAfterPhase(PhaseListenerManager.java:85) at org.eclipse.rwt.internal.lifecycle.RWTLifeCycle.continueLifeCycle(RWTLifeCycle.java:168) at org.eclipse.rwt.internal.lifecycle.RWTLifeCycle.sleep(RWTLifeCycle.java:253) at org.eclipse.swt.widgets.Display.sleep(Display.java:1174) at org.eclipse.ui.application.WorkbenchAdvisor.eventLoopIdle(WorkbenchAdvisor.java:361) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2734) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2694) at org.eclipse.ui.internal.Workbench.access$5(Workbench.java:2530) at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:702) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:685) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:157) at com.inpses.read.rap.Application.start(Application.java:18) at org.eclipse.rap.ui.internal.application.EntrypointApplicationWrapper.createUI(EntrypointApplicationWrapper.java:25) at org.eclipse.rwt.internal.lifecycle.EntryPointManager.createUI(EntryPointManager.java:81) at org.eclipse.rwt.internal.lifecycle.RWTLifeCycle.createUI(RWTLifeCycle.java:204) at org.eclipse.rwt.internal.lifecycle.RWTLifeCycle$UIThreadController.run(RWTLifeCycle.java:88) at java.lang.Thread.run(Thread.java:680) at org.eclipse.rwt.internal.lifecycle.UIThread.run(UIThread.java:101)