Starting with build 12 of Java SE 6 Update N (https://jdk6.dev.java.net/6uNea.html) an IllegalArgumentException occurs when showing e.g. an ULCTable with Scrollbars. UIScrollPane should support the keys UPPER_LEADING_CORNER, UPPER_TRAILING_CORNER, LOWER_LEADING_CORNER, LOWER_TRAILING_CORNER as defined in javax.swing.ScrollPaneConstants. The new keys can simply be mapped to the old ones as shown in http://www.jdocs.com/page/AjaxSourceCode?oid=29115#329 com.ulcjava.base.shared.internal.IllegalArgumentException: invalid corner key at com.ulcjava.base.client.UIScrollPane$BasicScrollPane.setCorner(UIScrollPane.java:14) at javax.swing.JTable.configureEnclosingScrollPane(Unknown Source) at javax.swing.JTable.addNotify(Unknown Source) at java.awt.Container.addNotify(Unknown Source) at javax.swing.JComponent.addNotify(Unknown Source) at java.awt.Container.addNotify(Unknown Source) at javax.swing.JComponent.addNotify(Unknown Source) at java.awt.Container.addNotify(Unknown Source) at javax.swing.JComponent.addNotify(Unknown Source) at java.awt.Container.addNotify(Unknown Source) at javax.swing.JComponent.addNotify(Unknown Source) at java.awt.Container.addNotify(Unknown Source) at javax.swing.JComponent.addNotify(Unknown Source) at java.awt.Container.addNotify(Unknown Source) at javax.swing.JComponent.addNotify(Unknown Source) at java.awt.Container.addNotify(Unknown Source) at javax.swing.JComponent.addNotify(Unknown Source) at javax.swing.JRootPane.addNotify(Unknown Source) at java.awt.Container.addNotify(Unknown Source) at java.awt.Window.addNotify(Unknown Source) at java.awt.Frame.addNotify(Unknown Source) at java.awt.Window.show(Unknown Source) at java.awt.Component.show(Unknown Source) at java.awt.Component.setVisible(Unknown Source) at java.awt.Window.setVisible(Unknown Source) at com.ulcjava.base.client.UIWindow.show(UIWindow.java:16) at com.ulcjava.base.client.UIWindow.setVisible(UIWindow.java:72) at com.ulcjava.base.client.UIWindow.postInitializeState(UIWindow.java:54) at com.ulcjava.base.client.UIFrame.postInitializeState(UIFrame.java:2) at com.ulcjava.base.client.UIProxy.init(UIProxy.java:76) at com.ulcjava.base.client.UISession.newInstance(UISession.java:34) at com.ulcjava.base.client.UISession.handleRequest(UISession.java:84) at com.ulcjava.base.client.UISession.b(UISession.java:278) at com.ulcjava.base.client.UISession.access$2000(UISession.java:317) at com.ulcjava.base.client.UISession$6.run(UISession$6.java:2) at java.awt.event.InvocationEvent.dispatch(Unknown Source) at java.awt.EventQueue.dispatchEvent(Unknown Source) at com.ulcjava.base.client.FilteringEventQueue.dispatchEvent(FilteringEventQueue.java:19) at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.run(Unknown Source)