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

@MattWho   Here is the log from nifi-app.log 2024-04-17 12:50:13,061 ERROR [Timer-Driven Process Thread-2] o.a.n.c.s.StandardControllerServiceNode StandardControllerServiceNode[service=DBCPConnectionPool[id=025a6b87-e362-3761-5695-a2871b444c4b], name=Ignite-db-localhost, active=true] Failed to invoke @OnEnabled method java.lang.NoClassDefFoundError: Could not initialize class org.apache.commons.dbcp2.BasicDataSource at org.apache.nifi.dbcp.AbstractDBCPConnectionPool.onConfigured(AbstractDBCPConnectionPool.java:139) at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103) at java.base/java.lang.reflect.Method.invoke(Method.java:580) at org.apache.nifi.util.ReflectionUtils.invokeMethodsWithAnnotations(ReflectionUtils.java:145) at org.apache.nifi.util.ReflectionUtils.invokeMethodsWithAnnotations(ReflectionUtils.java:133) at org.apache.nifi.util.ReflectionUtils.invokeMethodsWithAnnotations(ReflectionUtils.java:78) at org.apache.nifi.util.ReflectionUtils.invokeMethodsWithAnnotation(ReflectionUtils.java:55) at org.apache.nifi.controller.service.StandardControllerServiceNode$2.run(StandardControllerServiceNode.java:655) at org.apache.nifi.engine.FlowEngine$2.run(FlowEngine.java:110) at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:572) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317) at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642) at java.base/java.lang.Thread.run(Thread.java:1583) Caused by: java.lang.ExceptionInInitializerError: Exception java.lang.NoClassDefFoundError: Could not initialize class org.apache.ignite.IgniteJdbcThinDriver [in thread "Timer-Driven Process Thread-2"] at java.base/java.lang.Class.forName0(Native Method) at java.base/java.lang.Class.forName(Class.java:534) at java.base/java.lang.Class.forName(Class.java:513) at java.sql/java.sql.DriverManager.isDriverAllowed(DriverManager.java:559) at java.sql/java.sql.DriverManager.isDriverAllowed(DriverManager.java:551) at java.sql/java.sql.DriverManager.getDrivers(DriverManager.java:452) at java.sql/java.sql.DriverManager.getDrivers(DriverManager.java:429) at org.apache.commons.dbcp2.BasicDataSource.<clinit>(BasicDataSource.java:75) ... 15 common frames omitted   ... View more

@Jim_Steinebrey     @MattWho  Thanks for your response.  As mentioned, I have created another folder "thirdparty_lib" and updated the new location of jar file in "Database Driver Location(s)" field.  I am still getting the same error.  Please advise.       ... View more

@ckumar   Yes I've placed ignite-core-2.16.0.jar file in nifi lib directory.  ... View more