I'm trying to use DBCPConnectionPool service in my custom processor. So, how to use in-built controller services (which are already available on NiFi) in our custom processors.
Here are my properties in *-nar/->pom.xml
<dependencies>
<dependency>
<groupId>org.sample.com</groupId>
<artifactId>nifi-customprocessor-processors</artifactId>
<version>1.0</version>
</dependency>
<dependency>
<groupId>org.apache.nifi</groupId>
<artifactId>nifi-standard-services-api-nar</artifactId>
<version>1.14.0</version>
<type>nar</type>
</dependency>
</dependencies>
Here are my dependencies in *processors/->pom.xml
<dependency>
<groupId>org.apache.nifi</groupId>
<artifactId>nifi-api</artifactId>
</dependency>
<dependency>
<groupId>org.apache.nifi</groupId>
<artifactId>nifi-utils</artifactId>
<version>1.14.0</version>
</dependency>
<dependency>
<groupId>org.apache.nifi</groupId>
<artifactId>nifi-mock</artifactId>
<version>1.14.0</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-simple</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.nifi</groupId>
<artifactId>nifi-dbcp-service</artifactId>
<version>1.14.0</version>
</dependency>
<dependency>
<groupId>org.apache.nifi</groupId>
<artifactId>nifi-dbcp-service-api</artifactId>
<version>1.14.0</version>
</dependency>
And here is my propertydescriptor for DBCPConnetionPool service :-
public static final PropertyDescriptor DBCPConnectionPool_SERVICE = new PropertyDescriptor.Builder()
.name("DBCPConnectionPoolLookup Service")
.description("The Controller Service to use in order to establish a connection")
.required(true)
.dynamic(true)
.identifiesControllerService(DBCPService.class)
.addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
.build();
and in my OnTrigger method I didn't used it as :-
DBCPService DBCPService = context.getProperty(DBCPConnectionPool_SERVICE)
.asControllerService(DBCPService.class);
Connection con = DBCPService.getConnection();
and was trying to use this con object as in regular passion createStatement->executeQuery.
When I tried to package it using mvn clean install
it started throwing error as : A required class was missing while executing org.apache.nifi:nifi-nar-maven-plugi n:1.3.1:nar: org/apache/nifi/record/sink/RecordSinkService then I added the following dependencies in processors/->pom.xml
<dependency>
<groupId>org.apache.nifi</groupId>
<artifactId>nifi-record-sink-service</artifactId>
<version>1.14.0</version>
</dependency>
<dependency>
<groupId>org.apache.nifi</groupId>
<artifactId>nifi-record-sink-api</artifactId>
<version>1.14.0</version>
</dependency>
This time it was new error as :- Failed to create Extension Definition for CONTROLLER_SERVICE org.apache.nifi.record.sink.lookup.RecordSinkServiceLookup: Null PointerException
I also checked by commenting out code which I have written, to check the way I'm using that property was wrong but, even that didn't worked.:-
DBCPService DBCPService = context.getProperty(DBCPConnectionPool_SERVICE)
.asControllerService(DBCPService.class);
Connection con = DBCPService.getConnection();
Can someone help me out in order to use DBCPConnectionPoolService controller service in my custom processor?
I had the same issues the other day and I solved it by using AbstractControllerService
instead of DBCPConnectionPool
therefore not needing org.apache.nifi.dbcp.DBCPService
anymore. Therefore my code would look like this:
MyService DBCPService = context.getProperty(DBCPConnectionPool_SERVICE)
.asControllerService(MyService.class);
Connection con = DBCPService.getConnection();
MyService is the custom interface that extends ControllerService.(you have to use it when you also define the PropertyDescriptor DBCPConnectionPool_SERVICE
)
And StandardMyService
the class that extends AbstractControllerService
and implements MyService
and getConnection()
from it.
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