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Are there tools to migrate the tWAS configuration to Liberty and suggest issue area?
Yes, there is. On wasdev.net (Downloads sesction) you can find the WebSphere Configuration Migration Toolkit (for Eclipse). You load the tWAS configuration into this tool and get recommendations for the features and server.xml-configuration in WLP. https://developer.ibm.com/wasdev/downloads/#asset/tools-WebSphere_Configuration_Migration_Tool