<dependency>
<groupId>org.apache.nifi</groupId>
<artifactId>nifi-mongodb-client-service-api</artifactId>
<scope>provided</scope>
</dependency> Your dependency should be that. You also need to have a NAR dependency <packaging>nar</packaging>
<dependencies>
<dependency>
<groupId>org.apache.nifi</groupId>
<artifactId>nifi-mongodb-client-service-api-nar</artifactId>
<version>1.8.0</version>
<type>nar</type>
</dependency>
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