Hi @gaofzhan,   For what reason are you copying the JDBC driver to the NiFi's lib folder? When you need to JDBC driver for connecting to the remote sources, you typically only need to copy the ojdbc8.jar file. If you copy all the files that come in the tarball downloaded from Oracle it can cause errors like the one you describe.   Please remove the copied files from the lib folder, copy only the ojdbc8.jar one and try again.   Cheers, André -- Was your question answered? Please take some time to click on "Accept as Solution" below this post. If you find a reply useful, say thanks by clicking on the thumbs up button. ... View more

Hi, @VikasNayak07 ,   An easy way to achieve this is to use a JoltTransformRecord processor with a JsonTreeReader and a CSVRecordSetWriter. The following "Chain" transformation will produce the output that you want: [ { "operation": "shift", "spec": { "tokens": { "*": "[&].token" } } } ]   Cheers, André -- Was your question answered? Please take some time to click on "Accept as Solution" below this post. If you find a reply useful, say thanks by clicking on the thumbs up button. ... View more

Yep, I know. Would you be able to share the content of that file? You can send it to me in pvt if you prefer.   André   ... View more

@Swagat ,   What's the content of your host.pem?   André ... View more

@gaofzhan ,   What's the exact JDBC driver and version that you added to the lib folder?   André ... View more

@krishna123 ,   What's the Java version that you are using?   Cheers, André ... View more

@Swagat ,   Please check that the file /opt/cloudera/security/x509/key/host.pem exists and has read permissions for the impala user.   If the file exists, you can grant permission to the impala user by running the following command as root: setfacl -m user:impala:r-- /opt/cloudera/security/x509/key/host.pem   Cheers, André -- Was your question answered? Please take some time to click on "Accept as Solution" below this post. If you find a reply useful, say thanks by clicking on the thumbs up button. ... View more

@Dave0x1 ,   Would you be able to share your current configuration?   Cheers, André   ... View more

@JohnnyC ,   You can download the latest JDBC driver from here.   Cheers, André -- Was your question answered? Please take some time to click on "Accept as Solution" below this post. If you find a reply useful, say thanks by clicking on the thumbs up button. ... View more