NiFi connection to SqlServor for ExecuteSQL - sql-server

Question

I'm trying to import some data from different SqlServer databases using ExecuteSQL in NiFi, but it's returning me an error. I've already imported a lot of other tables from MySQL databases without any problem and I'm trying to use the same workflow structure for the SqlServer dbs.
The structure is as follows:
There's a file .txt with the list of tables to be imported
This file is fetched, splitted and uptaded; so there's a FlowFile for each table of each db that has to be imported,
These FlowFiles are passed into ExecuteSQL which executes their contents
For example:
file.txt
table1
table2
table3
is being updated into 3 different FlowFiles:
FlowFile1
SELECT * FROM table1
FlowFile2
SELECT * FROM table2
FlowFile3
SELECT * FROM table3
which are passed to ExecuteSQL.
Here follows the configuration of ExecuteSQL (identical for SqlServer tables and MySQL ones)
ExecuteSQL
As the only difference with the import from MySQL db is in the connectors, this is how a generic MySQL connector has been configured:
SETTINGSPROPERTIES
Database Connection URL jdbc:mysql://00.00.00.00/DataBase?zeroDateTimeBehavior=convertToNull&autoReconnect=true
Database Driver Class Name com.mysql.jdbc.Driver
Database Driver Location(s) file:///path/mysql-connector-java-5.1.47-bin.jar
Database User user
PasswordSensitive value set
Max Wait Time 500 millis
Max Total Connections 8
Validation query No value set
And this is how a SqlServer connector has been configured:
SETTINGSPROPERTIES
Database Connection URL jdbc:jtds:sqlserver://00.00.00.00/DataBase;useNTLMv2=true;integratedSecurity=true;
Database Driver Class Name net.sourceforge.jtds.jdbc.Driver
Database Driver Location(s) /path/connectors/jtds-1.3.1.jar
Database User user
PasswordSensitive value set
Max Wait Time -1
Max Total Connections 8
Validation query No value set
It has to be noticed that one (only one!) SqlServer connector works and the ExecuteSQL processor imports the data without any problem. The even stranger thing is that the database that is being connected via this connector is located in the same place as other two (the connection URL and user/psw are identical), but only the first one is working.
Notice that I've tried appending ?zeroDateTimeBehavior=convertToNull&autoReconnect=true also to the SqlServer connections, supposing it was a problem of date type, but it didn't give any positive change.
Here is the error that is being returned:
12:02:46 CEST ERROR f1553b83-a173-1c0f-93cb-1c32f0f46d1d
00.00.00.00:0000 ExecuteSQL[id=****] ExecuteSQL[id=****] failed to process session due to null; Processor Administratively Yielded for 1 sec: java.lang.AbstractMethodError
Error retrieved from logs:
ERROR [Timer-Driven Process Thread-49] o.a.nifi.processors.standard.ExecuteSQL ExecuteSQL[id=****] ExecuteSQL[id=****] failed to process session due to java.lang.AbstractMethodError; Processor Administratively Yielded for 1 sec: java.lang.AbstractMethodError
java.lang.AbstractMethodError: null
at net.sourceforge.jtds.jdbc.JtdsConnection.isValid(JtdsConnection.java:2833)
at org.apache.commons.dbcp2.DelegatingConnection.isValid(DelegatingConnection.java:874)
at org.apache.commons.dbcp2.PoolableConnection.validate(PoolableConnection.java:270)
at org.apache.commons.dbcp2.PoolableConnectionFactory.validateConnection(PoolableConnectionFactory.java:389)
at org.apache.commons.dbcp2.BasicDataSource.validateConnectionFactory(BasicDataSource.java:2398)
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.getConnection(DBCPConnectionPool.java:305)
at org.apache.nifi.dbcp.DBCPService.getConnection(DBCPService.java:49)
at sun.reflect.GeneratedMethodAccessor1696.invoke(Unknown Source)
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:84)
at com.sun.proxy.$Proxy449.getConnection(Unknown Source)
at org.apache.nifi.processors.standard.AbstractExecuteSQL.onTrigger(AbstractExecuteSQL.java:195)
at org.apache.nifi.processor.AbstractProcessor.onTrigger(AbstractProcessor.java:27)
at org.apache.nifi.controller.StandardProcessorNode.onTrigger(StandardProcessorNode.java:1165)
at org.apache.nifi.controller.tasks.ConnectableTask.invoke(ConnectableTask.java:203)
at org.apache.nifi.controller.scheduling.TimerDrivenSchedulingAgent$1.run(TimerDrivenSchedulingAgent.java:117)
at java.util.concurrent.Executors$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:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)