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You can review the list of plugins that are send to the client by adding "?raw=true" to the url of the Smart Client (http://domain:post/servoy-client/solutionName.jnlp) and then viewing the content of the JNLP file by looking at the source code of the page in the browser.

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Proxy Settings in Java Webstart, causing fallback to Direct Connection, for which requirements aren't met

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Errors because the connection to the database is lost

Oracle

When connecting to Oracle databases, make sure to use the correct version of the Oracle JDBC driver. Each Oracle database version has it's own version of a JDBC driver and when connecting to Oracle with a JDBC driver that was meant for another version of Oracle, the results can be mixed

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This is a known issue with the SQL Server driver

MySQL

Connection to database lost

MySQL is notorious for dropping idle connections after a certain timeout. This can be prevented by using the following  "validation query" for the Database Server connection: "select 1", at the cost of a little overhead. It's preferred to configure MySQL to use longer timeouts.