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sorry my english. My mysql server and tomcat server are running localhost, And my gwt web application is running correctly on Localhost, Then my web application connected mysql database. Then I deployed my web application (.war file) to another tomcat server(linux), it cannot connect to mysql (windows server) server. why?

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In your tomcat configuration file, you specified "localhost" as your database server. Change that to the hostname of the MySQL server.

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