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The Java console is a window that opens when a Java application starts and to which logging/debugging information can be written by the applications. When investigating issues in a Smart Client, enable the Java console to view what logging/debugging information the application provides. See the "Java console" settings under "Advanced" in the Java Control Panel.
Problems with Smart Clients fall into different categories and can be caused by a number of different reasons. Below an overview per category, with investigation guidelines and possible solutions.
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