Make Fiware-Cygnus storing to Apache-Phoenix database

I just asked this question on Stackoverflow too.

I'm new to Cygnus and to Phoenix db. I want Cygnus to store data in an Apache Phoenix db, so I have to configure the Phoenix Sink to work with Cygnus.

I know that Cygnus is an extension of Apache Flume, so any Flume agent can work with it by default (theoretically). I configured my Flume agent agent_phoenix.conf file for Cygnus like this:

cygnus-ngsi.channels = memoryChannel
cygnus-ngsi.sinks = phoenix-sink

cygnus-ngsi.sources.http-source.type = org.apache.flume.source.http.HTTPSource
cygnus-ngsi.sources.http-source.channels = memoryChannel
cygnus-ngsi.sources.http-source.port = 5051
cygnus-ngsi.sources.http-source.handler = com.telefonica.iot.cygnus.handlers.NGSIRestHandler
cygnus-ngsi.sources.http-source.handler.notification_target = /notify
cygnus-ngsi.sources.http-source.handler.default_service = default
cygnus-ngsi.sources.http-source.handler.default_service_path = /
cygnus-ngsi.sources.http-source.interceptors = ts gi
cygnus-ngsi.sources.http-source.interceptors.ts.type = timestamp
cygnus-ngsi.sources.http-source.interceptors.gi.type = com.telefonica.iot.cygnus.interceptors.NGSIGroupingInterceptor$Builder
cygnus-ngsi.sources.http-source.interceptors.gi.grouping_rules_conf_file = /opt/apache-flume/conf/grouping_rules.conf

cygnus-ngsi.channels.memoryChannel.type=memory
cygnus-ngsi.channels.memoryChannel.transactionCapacity=100
cygnus-ngsi.channels.memoryChannel.byteCapacityBufferPercentage=20

cygnus-ngsi.sinks.phoenix-sink.type=org.apache.phoenix.flume.sink.PhoenixSink
cygnus-ngsi.sinks.phoenix-sink.channel=memoryChannel
cygnus-ngsi.sinks.phoenix-sink.batchSize=100
cygnus-ngsi.sinks.phoenix-sink.table=PROVA_PHOENIX
c.sinks.phoenix-sink.ddl=CREATETABLEIFNOTEXISTSPROVA_PHOENIX(uidVARCHARNOTNULL,f_hostVARCHARCONSTRAINTpkPRIMARYKEY(uid),colonnaProvaVARCHAR)
cygnus-ngsi.sinks.phoenix-sink.zookeeperQuorum=localhost
cygnus-ngsi.sinks.phoenix-sink.serializer=REGEX
cygnus-ngsi.sinks.phoenix-sink.serializer.rowkeyType=uuid
cygnus-ngsi.sinks.phoenix-sink.serializer.columns=colonnaProva

and launched it using this command on CentOS command line:

/usr/cygnus/bin/cygnus-flume-ng agent --conf /usr/cygnus/conf/ -f /usr/cygnus/conf/agent_phoenix.conf -n cygnus-ngsi -Dflume.root.logger=INFO,console

It starts doing some initializations but then I get this message:

76666 [lifecycleSupervisor-1-8] ERROR org.apache.phoenix.flume.serializer.BaseEventSerializer  - error No suitable driver found for jdbc:phoenix:localhost; occurred during initializing connection 
176667 [lifecycleSupervisor-1-8] ERROR org.apache.phoenix.flume.sink.PhoenixSink  - Error No suitable driver found for jdbc:phoenix:localhost; in initializing the serializer.
176667 [lifecycleSupervisor-1-8] ERROR org.apache.flume.lifecycle.LifecycleSupervisor  - Unable to start SinkRunner: { policy:org.apache.flume.sink.DefaultSinkProcessor@29918f3 counterGroup:{ name:null counters:{} } } - Exception follows.
java.lang.RuntimeException: java.sql.SQLException: No suitable driver found for jdbc:phoenix:localhost;
at com.google.common.base.Throwables.propagate(Throwables.java:156)
at org.apache.phoenix.flume.sink.PhoenixSink.start(PhoenixSink.java:124)
at org.apache.flume.sink.DefaultSinkProcessor.start(DefaultSinkProcessor.java:46)
at org.apache.flume.SinkRunner.start(SinkRunner.java:79)
at org.apache.flume.lifecycle.LifecycleSupervisor$MonitorRunnable.run(LifecycleSupervisor.java:251)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:473)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.sql.SQLException: No suitable driver found for jdbc:phoenix:localhost;
at java.sql.DriverManager.getConnection(DriverManager.java:596)
at ...