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The 7.3 release notes (https://netbeans.org/community/releases/73/relnotes.html) state that: "The MySQL drivers included in NetBeans IDE have been updated to version 6.0." But there is no 6.0 version of the MySQL JDBC driver (as of 2013-09-14 the current version is 5.1.26). The version that is included in the 7.3.1 download is: mysql-connector-java-5.1.23-bin.jar