Normally on mvnrepository.com you can find all versions, but there is probably an error in docs with the version of connector. The latest version I can see is 3.3.0-1.20

there is flink-connector-jdbc-core with version 4.0.0-2.0

<dependency>
    <groupId>org.apache.flink</groupId>
    <artifactId>flink-connector-jdbc-core</artifactId>
    <version>4.0.0-2.0</version>
</dependency>

So rather you need to use an older version, otherwise you probably need to change flink-connector-jdbc to flink-connector-jdbc-core .