A JAR file could contain a configuration file that will override the default configuration of a ZK application. The file must be named as config.xml and placed under the /metainfo/zk directory. Of course, the configuration specified in WEB-INF/zk.xml has higher priority. It will override the configuration specified in /metainfo/zk/config.xml.
By use of config.xml, a JAR file could change the default configuration without a user's notice, such as adding a desktop listener, setting a library property, and so on. For more information, please refer to ZK Developer's Reference: Packing Code.
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