Thank you @MattWho   Your recommendation worked for me. I have updated bootstrap.conf file in nifi.  Was able to successfully enable DB controller service and persist data into Ignite database from Nifi. Details: Copied jvm parameters available in the file \apache-ignite-2.16.0-bin\bin\include\jvmdefaults.sh to \nifi-2.0.0-M2\conf\bootstrap.conf file Here is the format and exact list of java arguments added in nifi bootstrap java.arg.21=--add-opens=java.base/jdk.internal.access=ALL-UNNAMED java.arg.22=--add-opens=java.base/jdk.internal.misc=ALL-UNNAMED java.arg.23=--add-opens=java.base/sun.nio.ch=ALL-UNNAMED java.arg.24=--add-opens=java.base/sun.util.calendar=ALL-UNNAMED java.arg.25=--add-opens=java.management/com.sun.jmx.mbeanserver=ALL-UNNAMED java.arg.26=--add-opens=jdk.internal.jvmstat/sun.jvmstat.monitor=ALL-UNNAMED java.arg.27=--add-opens=java.base/sun.reflect.generics.reflectiveObjects=ALL-UNNAMED java.arg.28=--add-opens=jdk.management/com.sun.management.internal=ALL-UNNAMED java.arg.29=--add-opens=java.base/java.io=ALL-UNNAMED java.arg.30=--add-opens=java.base/java.nio=ALL-UNNAMED java.arg.31=--add-opens=java.base/java.net=ALL-UNNAMED java.arg.32=--add-opens=java.base/java.util=ALL-UNNAMED java.arg.33=--add-opens=java.base/java.util.concurrent=ALL-UNNAMED java.arg.34=--add-opens=java.base/java.util.concurrent.locks=ALL-UNNAMED java.arg.35=--add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED java.arg.36=--add-opens=java.base/java.lang=ALL-UNNAMED java.arg.37=--add-opens=java.base/java.lang.invoke=ALL-UNNAMED java.arg.38=--add-opens=java.base/java.math=ALL-UNNAMED java.arg.39=--add-opens=java.sql/java.sql=ALL-UNNAMED java.arg.40=--add-opens=java.base/java.lang.reflect=ALL-UNNAMED java.arg.41=--add-opens=java.base/java.time=ALL-UNNAMED java.arg.42=--add-opens=java.base/java.text=ALL-UNNAMED java.arg.43=--add-opens=java.management/sun.management=ALL-UNNAMED java.arg.44=--add-opens=java.desktop/java.awt.font=ALL-UNNAMED We just need to make sure java.arg.<>  numbers are unused in the bootstrap file that we are working on. Thanks again! ... View more

I agree with ckumar's point and there is one more thing you could do if it makes you feel safer. You could put the HadoopConfigurationResources file path string into a sensitive parameter and refer to the that parameter (using #{paramname}) in the HiveCatalogService property. ... View more

Did you get a solution to this . I am also getting a communication error . My Nifi Instance and Mysql are on the same linux server .  ... View more