Brian,
In fact after digging on impala jdbc.driver there a reference to slf4j-log4j12 
jar.
"
 #Generated by Maven
#Thu Mar 16 17:18:25 CET 2017
version=1.7.25
groupId=org.slf4j
artifactId=slf4j-log4j12
"

Thanks Josef and Boris,  I will try with and older version of  the jdbc driver. 
Carlos



-----Original Message-----
From: Bryan Bende [mailto:[email protected]] 
Sent: sexta-feira, 7 de junho de 2019 16:06
To: [email protected]
Subject: Re: Connect NIFI with Impala by DBCPConnectionPool

NiFi has log4j-over-slf4j-1.7.26.jar in the root lib directory, so it
is on the classpath of all components.

I'm guessing the Impala JDBC driver is a shaded JAR that includes
slf4j-log4j12.jar?

Not really sure of a solution, just theorizing on what the problem is.

On Fri, Jun 7, 2019 at 10:45 AM <[email protected]> wrote:
>
> Hi Carlos
>
>
>
> I’m facing exact the same issue and I posted already in the cloudera forum. 
> However no useful response yet ☹:
>
> https://community.cloudera.com/t5/Interactive-Short-cycle-SQL/JDBC-Driver-Upgrade-to-2-6-9-fails-on-Apache-NiFi/td-p/89754
>
>
>
> I asked as well in the impala user group 
> (http://mail-archives.apache.org/mod_mbox/impala-user/201904.mbox/%[email protected]%3E)
>  but they told me that it is a driver from cloudera…
>
>
>
> My workaround for the moment is to use an older jdbc driver (2.6.4).
>
>
>
> If anybody from nifi side has an idea how to resolve the log4j jar hell, I’m 
> open for ideas.
>
>
>
> Cheers Josef
>
>
>
>
>
>
>
> From: "Carlos Manuel Fernandes (DSI)" <[email protected]>
> Reply-To: "[email protected]" <[email protected]>
> Date: Friday, 7 June 2019 at 16:30
> To: "[email protected]" <[email protected]>
> Subject: Connect NIFI with Impala by DBCPConnectionPool
>
>
>
> Hello,
>
>
>
> I’ m trying  to connect Nifi (version 1.9.2)   to Impala (3.2.0-cdh6.2.0)  
> with DBCPConnectionPool using jdbc driver ImpalaJDBC41.jar, using Kerberos  
> authentication.
>
>
>
> I Configured a controller KeytabCredentials pointing to keytab and in 
> nifi.properties i set nifi.kerberos.krb5.file to krb5.ini. I made a test with 
> a standalone java program using this krb5.ini  and keytab as System 
> properties, and worked well.
>
>
>
>
>
> Apparently  there is a mismatch of class of logfj from Nifi and impala driver 
> : “Detected both log4j-over-slf4j.jar AND bound slf4j-log4j12.jar on the 
> class path”
>
>
>
> Any ideas ?
>
>
>
> Carlos
>
>
>
>
>
> Full Exception: 2019-06-07 15:12:26,897 ERROR [Timer-Driven Process 
> Thread-30] o.a.nifi.processors.standard.ExecuteSQL 
> ExecuteSQL[id=10231224-1c5a-1337-ab8d-df3308c759c2] 
> ExecuteSQL[id=10231224-1c5a-1337-ab8d-df3308c759c2] failed to process session 
> due to java.lang.ExceptionInInitializerError; Processor Administratively 
> Yielded for 1 sec: java.lang.ExceptionInInitializerError
>
> java.lang.ExceptionInInitializerError: null
>
>         at 
> com.cloudera.impala.jdbc41.internal.slf4j.impl.StaticLoggerBinder.<init>(StaticLoggerBinder.java:72)
>
>         at 
> com.cloudera.impala.jdbc41.internal.slf4j.impl.StaticLoggerBinder.<clinit>(StaticLoggerBinder.java:45)
>
>         at 
> com.cloudera.impala.jdbc41.internal.slf4j.LoggerFactory.bind(LoggerFactory.java:150)
>
>         at 
> com.cloudera.impala.jdbc41.internal.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:124)
>
>         at 
> com.cloudera.impala.jdbc41.internal.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:412)
>
>         at 
> com.cloudera.impala.jdbc41.internal.slf4j.LoggerFactory.getLogger(LoggerFactory.java:357)
>
>         at 
> com.cloudera.impala.jdbc41.internal.apache.thrift.transport.TIOStreamTransport.<clinit>(TIOStreamTransport.java:38)
>
>         at 
> com.cloudera.impala.hivecommon.api.HiveServer2ClientFactory.createTransport(Unknown
>  Source)
>
>         at 
> com.cloudera.impala.hivecommon.api.ServiceDiscoveryFactory.createClient(Unknown
>  Source)
>
>         at 
> com.cloudera.impala.hivecommon.core.HiveJDBCCommonConnection.establishConnection(Unknown
>  Source)
>
>         at 
> com.cloudera.impala.impala.core.ImpalaJDBCConnection.establishConnection(Unknown
>  Source)
>
>         at 
> com.cloudera.impala.jdbc.core.LoginTimeoutConnection.connect(Unknown Source)
>
>         at 
> com.cloudera.impala.jdbc.common.BaseConnectionFactory.doConnect(Unknown 
> Source)
>
>         at com.cloudera.impala.jdbc.common.AbstractDriver.connect(Unknown 
> Source)
>
>         at 
> org.apache.commons.dbcp2.DriverConnectionFactory.createConnection(DriverConnectionFactory.java:53)
>
>         at 
> org.apache.commons.dbcp2.PoolableConnectionFactory.makeObject(PoolableConnectionFactory.java:291)
>
>         at 
> org.apache.commons.dbcp2.BasicDataSource.validateConnectionFactory(BasicDataSource.java:2395)
>
>         at 
> org.apache.commons.dbcp2.BasicDataSource.createPoolableConnectionFactory(BasicDataSource.java:2381)
>
>         at 
> org.apache.commons.dbcp2.BasicDataSource.createDataSource(BasicDataSource.java:2110)
>
>         at 
> org.apache.commons.dbcp2.BasicDataSource.getConnection(BasicDataSource.java:1563)
>
>         at 
> org.apache.nifi.dbcp.DBCPConnectionPool.lambda$getConnection$2(DBCPConnectionPool.java:467)
>
>         at java.security.AccessController.doPrivileged(Native Method)
>
>         at javax.security.auth.Subject.doAs(Subject.java:422)
>
>         at 
> org.apache.nifi.security.krb.AbstractKerberosUser.doAs(AbstractKerberosUser.java:143)
>
>         at 
> org.apache.nifi.security.krb.KerberosAction.execute(KerberosAction.java:68)
>
>         at 
> org.apache.nifi.dbcp.DBCPConnectionPool.getConnection(DBCPConnectionPool.java:468)
>
>         at org.apache.nifi.dbcp.DBCPService.getConnection(DBCPService.java:49)
>
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>
>         at 
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
>
>         at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>
>         at java.lang.reflect.Method.invoke(Method.java:498)
>
>         at 
> org.apache.nifi.controller.service.StandardControllerServiceInvocationHandler.invoke(StandardControllerServiceInvocationHandler.java:87)
>
>         at com.sun.proxy.$Proxy87.getConnection(Unknown Source)
>
>         at 
> org.apache.nifi.processors.standard.AbstractExecuteSQL.onTrigger(AbstractExecuteSQL.java:222)
>
>         at 
> org.apache.nifi.processor.AbstractProcessor.onTrigger(AbstractProcessor.java:27)
>
>         at 
> org.apache.nifi.controller.StandardProcessorNode.onTrigger(StandardProcessorNode.java:1162)
>
>         at 
> org.apache.nifi.controller.tasks.ConnectableTask.invoke(ConnectableTask.java:209)
>
>         at 
> org.apache.nifi.controller.scheduling.TimerDrivenSchedulingAgent$1.run(TimerDrivenSchedulingAgent.java:117)
>
>         at org.apache.nifi.engine.FlowEngine$2.run(FlowEngine.java:110)
>
>         at 
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
>
>         at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
>
>         at 
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
>
>         at 
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
>
>         at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>
>         at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>
>         at java.lang.Thread.run(Thread.java:745)
>
> Caused by: java.lang.IllegalStateException: Detected both 
> log4j-over-slf4j.jar AND bound slf4j-log4j12.jar on the class path, 
> preempting StackOverflowError. See also 
> http://www.slf4j.org/codes.html#log4jDelegationLoop for more details.
>
>         at 
> com.cloudera.impala.jdbc41.internal.slf4j.impl.Log4jLoggerFactory.<clinit>(Log4jLoggerFactory.java:54)
>
>         ... 46 common frames omitted
>
> 2019-06-07 15:12:26,897 WARN [Timer-Driven Process Thread-30] 
> o.a.n.controller.tasks.ConnectableTask Administratively Yielding 
> ExecuteSQL[id=10231224-1c5a-1337-ab8d-df3308c759c2] due to uncaught 
> Exception: java.lang.ExceptionInInitializerError
>
> java.lang.ExceptionInInitializerError: null
>
>         at 
> com.cloudera.impala.jdbc41.internal.slf4j.impl.StaticLoggerBinder.<init>(StaticLoggerBinder.java:72)
>
>         at 
> com.cloudera.impala.jdbc41.internal.slf4j.impl.StaticLoggerBinder.<clinit>(StaticLoggerBinder.java:45)
>
>         at 
> com.cloudera.impala.jdbc41.internal.slf4j.LoggerFactory.bind(LoggerFactory.java:150)
>
>         at 
> com.cloudera.impala.jdbc41.internal.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:124)
>
>         at 
> com.cloudera.impala.jdbc41.internal.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:412)
>
>         at 
> com.cloudera.impala.jdbc41.internal.slf4j.LoggerFactory.getLogger(LoggerFactory.java:357)
>
>         at 
> com.cloudera.impala.jdbc41.internal.apache.thrift.transport.TIOStreamTransport.<clinit>(TIOStreamTransport.java:38)
>
>         at 
> com.cloudera.impala.hivecommon.api.HiveServer2ClientFactory.createTransport(Unknown
>  Source)
>
>         at 
> com.cloudera.impala.hivecommon.api.ServiceDiscoveryFactory.createClient(Unknown
>  Source)
>
>         at 
> com.cloudera.impala.hivecommon.core.HiveJDBCCommonConnection.establishConnection(Unknown
>  Source)
>
>         at 
> com.cloudera.impala.impala.core.ImpalaJDBCConnection.establishConnection(Unknown
>  Source)
>
>         at 
> com.cloudera.impala.jdbc.core.LoginTimeoutConnection.connect(Unknown Source)
>
>         at 
> com.cloudera.impala.jdbc.common.BaseConnectionFactory.doConnect(Unknown 
> Source)
>
>         at com.cloudera.impala.jdbc.common.AbstractDriver.connect(Unknown 
> Source)
>
>         at 
> org.apache.commons.dbcp2.DriverConnectionFactory.createConnection(DriverConnectionFactory.java:53)
>
>         at 
> org.apache.commons.dbcp2.PoolableConnectionFactory.makeObject(PoolableConnectionFactory.java:291)
>
>         at 
> org.apache.commons.dbcp2.BasicDataSource.validateConnectionFactory(BasicDataSource.java:2395)
>
>         at 
> org.apache.commons.dbcp2.BasicDataSource.createPoolableConnectionFactory(BasicDataSource.java:2381)
>
>         at 
> org.apache.commons.dbcp2.BasicDataSource.createDataSource(BasicDataSource.java:2110)
>
>         at 
> org.apache.commons.dbcp2.BasicDataSource.getConnection(BasicDataSource.java:1563)
>
>         at 
> org.apache.nifi.dbcp.DBCPConnectionPool.lambda$getConnection$2(DBCPConnectionPool.java:467)
>
>         at java.security.AccessController.doPrivileged(Native Method)
>
>         at javax.security.auth.Subject.doAs(Subject.java:422)
>
>         at 
> org.apache.nifi.security.krb.AbstractKerberosUser.doAs(AbstractKerberosUser.java:143)
>
>         at 
> org.apache.nifi.security.krb.KerberosAction.execute(KerberosAction.java:68)
>
>         at 
> org.apache.nifi.dbcp.DBCPConnectionPool.getConnection(DBCPConnectionPool.java:468)
>
>         at org.apache.nifi.dbcp.DBCPService.getConnection(DBCPService.java:49)
>
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>
>         at 
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
>
>         at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>
>         at java.lang.reflect.Method.invoke(Method.java:498)
>
>         at 
> org.apache.nifi.controller.service.StandardControllerServiceInvocationHandler.invoke(StandardControllerServiceInvocationHandler.java:87)
>
>         at com.sun.proxy.$Proxy87.getConnection(Unknown Source)
>
>         at 
> org.apache.nifi.processors.standard.AbstractExecuteSQL.onTrigger(AbstractExecuteSQL.java:222)
>
>         at 
> org.apache.nifi.processor.AbstractProcessor.onTrigger(AbstractProcessor.java:27)
>
>         at 
> org.apache.nifi.controller.StandardProcessorNode.onTrigger(StandardProcessorNode.java:1162)
>
>         at 
> org.apache.nifi.controller.tasks.ConnectableTask.invoke(ConnectableTask.java:209)
>
>         at 
> org.apache.nifi.controller.scheduling.TimerDrivenSchedulingAgent$1.run(TimerDrivenSchedulingAgent.java:117)
>
>         at org.apache.nifi.engine.FlowEngine$2.run(FlowEngine.java:110)
>
>         at 
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
>
>         at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
>
>         at 
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
>
>         at 
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
>
>         at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>
>         at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>
>         at java.lang.Thread.run(Thread.java:745)
>
> Caused by: java.lang.IllegalStateException: Detected both 
> log4j-over-slf4j.jar AND bound slf4j-log4j12.jar on the class path, 
> preempting StackOverflowError. See also 
> http://www.slf4j.org/codes.html#log4jDelegationLoop for more details.
>
>         at 
> com.cloudera.impala.jdbc41.internal.slf4j.impl.Log4jLoggerFactory.<clinit>(Log4jLoggerFactory.java:54)
>
>         ... 46 common frames omitted
>
> 2019-06-07 15:12:27,907 ERROR [Timer-Driven Process Thread-185] 
> o.a.nifi.processors.standard.ExecuteSQL 
> ExecuteSQL[id=10231224-1c5a-1337-ab8d-df3308c759c2] 
> ExecuteSQL[id=10231224-1c5a-1337-ab8d-df3308c759c2] failed to process session 
> due to java.lang.NoClassDefFoundError: Could not initialize class 
> com.cloudera.impala.jdbc41.internal.apache.thrift.transport.TSocket; 
> Processor Administratively Yielded for 1 sec: java.lang.NoClassDefFoundError: 
> Could not initialize class 
> com.cloudera.impala.jdbc41.internal.apache.thrift.transport.TSocket
>
> java.lang.NoClassDefFoundError: Could not initialize class 
> com.cloudera.impala.jdbc41.internal.apache.thrift.transport.TSocket
>
>         at 
> com.cloudera.impala.hivecommon.api.HiveServer2ClientFactory.createTransport(Unknown
>  Source)
>
>         at 
> com.cloudera.impala.hivecommon.api.ServiceDiscoveryFactory.createClient(Unknown
>  Source)
>
>         at 
> com.cloudera.impala.hivecommon.core.HiveJDBCCommonConnection.establishConnection(Unknown
>  Source)
>
>         at 
> com.cloudera.impala.impala.core.ImpalaJDBCConnection.establishConnection(Unknown
>  Source)
>
>         at 
> com.cloudera.impala.jdbc.core.LoginTimeoutConnection.connect(Unknown Source)
>
>         at 
> com.cloudera.impala.jdbc.common.BaseConnectionFactory.doConnect(Unknown 
> Source)
>
>         at com.cloudera.impala.jdbc.common.AbstractDriver.connect(Unknown 
> Source)
>
>         at 
> org.apache.commons.dbcp2.DriverConnectionFactory.createConnection(DriverConnectionFactory.java:53)
>
>         at 
> org.apache.commons.dbcp2.PoolableConnectionFactory.makeObject(PoolableConnectionFactory.java:291)
>
>         at 
> org.apache.commons.dbcp2.BasicDataSource.validateConnectionFactory(BasicDataSource.java:2395)
>
>         at 
> org.apache.commons.dbcp2.BasicDataSource.createPoolableConnectionFactory(BasicDataSource.java:2381)
>
>         at 
> org.apache.commons.dbcp2.BasicDataSource.createDataSource(BasicDataSource.java:2110)
>
>         at 
> org.apache.commons.dbcp2.BasicDataSource.getConnection(BasicDataSource.java:1563)
>
>         at 
> org.apache.nifi.dbcp.DBCPConnectionPool.lambda$getConnection$2(DBCPConnectionPool.java:467)
>
>         at java.security.AccessController.doPrivileged(Native Method)
>
>         at javax.security.auth.Subject.doAs(Subject.java:422)
>
>         at 
> org.apache.nifi.security.krb.AbstractKerberosUser.doAs(AbstractKerberosUser.java:143)
>
>         at 
> org.apache.nifi.security.krb.KerberosAction.execute(KerberosAction.java:68)
>
>         at 
> org.apache.nifi.dbcp.DBCPConnectionPool.getConnection(DBCPConnectionPool.java:468)
>
>         at org.apache.nifi.dbcp.DBCPService.getConnection(DBCPService.java:49)
>
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>
>         at 
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
>
>        at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>
>         at java.lang.reflect.Method.invoke(Method.java:498)
>
>         at 
> org.apache.nifi.controller.service.StandardControllerServiceInvocationHandler.invoke(StandardControllerServiceInvocationHandler.java:87)
>
>         at com.sun.proxy.$Proxy87.getConnection(Unknown Source)
>
>         at 
> org.apache.nifi.processors.standard.AbstractExecuteSQL.onTrigger(AbstractExecuteSQL.java:222)
>
>         at 
> org.apache.nifi.processor.AbstractProcessor.onTrigger(AbstractProcessor.java:27)
>
>         at 
> org.apache.nifi.controller.StandardProcessorNode.onTrigger(StandardProcessorNode.java:1162)
>
>         at 
> org.apache.nifi.controller.tasks.ConnectableTask.invoke(ConnectableTask.java:209)
>
>         at 
> org.apache.nifi.controller.scheduling.TimerDrivenSchedulingAgent$1.run(TimerDrivenSchedulingAgent.java:117)
>
>         at org.apache.nifi.engine.FlowEngine$2.run(FlowEngine.java:110)
>
>         at 
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
>
>         at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
>
>         at 
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
>
>         at 
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
>
>         at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>
>         at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>
>         at java.lang.Thread.run(Thread.java:745)
>
> 2019-06-07 15:12:27,908 WARN [Timer-Driven Process Thread-185] 
> o.a.n.controller.tasks.ConnectableTask Administratively Yielding 
> ExecuteSQL[id=10231224-1c5a-1337-ab8d-df3308c759c2] due to uncaught 
> Exception: java.lang.NoClassDefFoundError: Could not initialize class 
> com.cloudera.impala.jdbc41.internal.apache.thrift.transport.TSocket
>
> java.lang.NoClassDefFoundError: Could not initialize class 
> com.cloudera.impala.jdbc41.internal.apache.thrift.transport.TSocket
>
>         at 
> com.cloudera.impala.hivecommon.api.HiveServer2ClientFactory.createTransport(Unknown
>  Source)
>
>         at 
> com.cloudera.impala.hivecommon.api.ServiceDiscoveryFactory.createClient(Unknown
>  Source)
>
>         at 
> com.cloudera.impala.hivecommon.core.HiveJDBCCommonConnection.establishConnection(Unknown
>  Source)
>
>         at 
> com.cloudera.impala.impala.core.ImpalaJDBCConnection.establishConnection(Unknown
>  Source)
>
>         at 
> com.cloudera.impala.jdbc.core.LoginTimeoutConnection.connect(Unknown Source)
>
>        at 
> com.cloudera.impala.jdbc.common.BaseConnectionFactory.doConnect(Unknown 
> Source)
>
>         at com.cloudera.impala.jdbc.common.AbstractDriver.connect(Unknown 
> Source)
>
>         at 
> org.apache.commons.dbcp2.DriverConnectionFactory.createConnection(DriverConnectionFactory.java:53)
>
>         at 
> org.apache.commons.dbcp2.PoolableConnectionFactory.makeObject(PoolableConnectionFactory.java:291)
>
>         at 
> org.apache.commons.dbcp2.BasicDataSource.validateConnectionFactory(BasicDataSource.java:2395)
>
>         at 
> org.apache.commons.dbcp2.BasicDataSource.createPoolableConnectionFactory(BasicDataSource.java:2381)
>
>         at 
> org.apache.commons.dbcp2.BasicDataSource.createDataSource(BasicDataSource.java:2110)
>
>         at 
> org.apache.commons.dbcp2.BasicDataSource.getConnection(BasicDataSource.java:1563)
>
>         at 
> org.apache.nifi.dbcp.DBCPConnectionPool.lambda$getConnection$2(DBCPConnectionPool.java:467)
>
>         at java.security.AccessController.doPrivileged(Native Method)
>
>         at javax.security.auth.Subject.doAs(Subject.java:422)
>
>         at 
> org.apache.nifi.security.krb.AbstractKerberosUser.doAs(AbstractKerberosUser.java:143)
>
>         at 
> org.apache.nifi.security.krb.KerberosAction.execute(KerberosAction.java:68)
>
>         at 
> org.apache.nifi.dbcp.DBCPConnectionPool.getConnection(DBCPConnectionPool.java:468)
>
>         at org.apache.nifi.dbcp.DBCPService.getConnection(DBCPService.java:49)
>
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>
>         at 
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
>
>         at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>
>         at java.lang.reflect.Method.invoke(Method.java:498)
>
>         at 
> org.apache.nifi.controller.service.StandardControllerServiceInvocationHandler.invoke(StandardControllerServiceInvocationHandler.java:87)
>
>         at com.sun.proxy.$Proxy87.getConnection(Unknown Source)
>
>         at 
> org.apache.nifi.processors.standard.AbstractExecuteSQL.onTrigger(AbstractExecuteSQL.java:222)
>
>         at 
> org.apache.nifi.processor.AbstractProcessor.onTrigger(AbstractProcessor.java:27)
>
>         at 
> org.apache.nifi.controller.StandardProcessorNode.onTrigger(StandardProcessorNode.java:1162)
>
>         at 
> org.apache.nifi.controller.tasks.ConnectableTask.invoke(ConnectableTask.java:209)
>
>         at 
> org.apache.nifi.controller.scheduling.TimerDrivenSchedulingAgent$1.run(TimerDrivenSchedulingAgent.java:117)
>
>         at org.apache.nifi.engine.FlowEngine$2.run(FlowEngine.java:110)
>
>         at 
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
>
>         at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
>
>         at 
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
>
>         at 
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
>
>         at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>
>         at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>
>         at java.lang.Thread.run(Thread.java:745)
>
> 2019-06-07 15:12:28,192 INFO [Flow Service Tasks Thread-2] 
> o.a.nifi.controller.StandardFlowService Saved flow controller 
> org.apache.nifi.controller.FlowController@7457006c // Another save pending = 
> false
>
> 2019-06-07 15:12:28,525 INFO [NiFi Web Server-494] 
> o.a.n.c.s.StandardProcessScheduler Stopping 
> ExecuteSQL[id=10231224-1c5a-1337-ab8d-df3308c759c2]
>
> 2019-06-07 15:12:28,526 INFO [NiFi Web Server-494] 
> o.a.n.controller.StandardProcessorNode Stopping processor: class 
> org.apache.nifi.processors.standard.ExecuteSQL
>
> 2019-06-07 15:12:28,526 INFO [Timer-Driven Process Thread-150] 
> o.a.n.c.s.TimerDrivenSchedulingAgent Stopped scheduling 
> ExecuteSQL[id=10231224-1c5a-1337-ab8d-df3308c759c2] to run

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