Problems with Kafka Source initialization in Siddhi - apache-kafka

Question

Can't create stream from Kafka topic using Siddhi. Even if I create string with Design View.
I copied all required jars to lib and bundle folders. Even started Kafka with Zookeeper locally (dunno why I need it locally but nwm).
On tooling.sh start I have following error:
[2020-02-26 22:15:43,041] WARNING {org.wso2.carbon.launcher.extensions.OSGiLibBundleDeployerUtils lambda$getBundlesInfo$1} - Error when loading the OSGi bundle information from /home/Hed/StreamProcessor/siddhi-tooling-5.1.2/lib/kafka-clients-2.3.0.jar
java.io.IOException: Required bundle manifest headers do not exist
at org.wso2.carbon.launcher.extensions.OSGiLibBundleDeployerUtils.getBundleInfo(OSGiLibBundleDeployerUtils.java:183)
at org.wso2.carbon.launcher.extensions.OSGiLibBundleDeployerUtils.lambda$getBundlesInfo$1(OSGiLibBundleDeployerUtils.java:135)
at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
at java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472)
at java.util.stream.StreamSpliterators$WrappingSpliterator.forEachRemaining(StreamSpliterators.java:313)
at java.util.stream.StreamSpliterators$DistinctSpliterator.forEachRemaining(StreamSpliterators.java:1291)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472)
at java.util.stream.ReduceOps$ReduceTask.doLeaf(ReduceOps.java:747)
at java.util.stream.ReduceOps$ReduceTask.doLeaf(ReduceOps.java:721)
at java.util.stream.AbstractTask.compute(AbstractTask.java:327)
at java.util.concurrent.CountedCompleter.exec(CountedCompleter.java:731)
at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)
at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)
For this script:
#App:name("HelloKafka")
#App:description('Consume events from a Kafka Topic and publish to a different Kafka Topic')
#source(type='kafka',
topic.list='kafka_topic',
partition.no.list='0',
threading.option='single.thread',
group.id="group",
bootstrap.servers='localhost:9092',
#map(type='json'))
define stream SweetProductionStream (name string, amount double);
I have see error on Run command:
io.siddhi.core.exception.SiddhiAppCreationException: Error on 'HelloKafka' # Line: 10. Position: 26, near '#source(type='kafka',
topic.list='kafka_topic',
partition.no.list='0',
threading.option='single.thread',
group.id="group",
bootstrap.servers='localhost:9092',
#map(type='json'))'. org/apache/kafka/clients/producer/Producer
at io.siddhi.core.util.ExceptionUtil.populateQueryContext(ExceptionUtil.java:43)
at io.siddhi.core.util.parser.helper.DefinitionParserHelper.addEventSource(DefinitionParserHelper.java:388)
at io.siddhi.core.util.SiddhiAppRuntimeBuilder.defineStream(SiddhiAppRuntimeBuilder.java:117)
at io.siddhi.core.util.parser.SiddhiAppParser.defineStreamDefinitions(SiddhiAppParser.java:374)
at io.siddhi.core.util.parser.SiddhiAppParser.parse(SiddhiAppParser.java:230)
at io.siddhi.core.SiddhiManager.createSiddhiAppRuntime(SiddhiManager.java:85)
at io.siddhi.core.SiddhiManager.createSiddhiAppRuntime(SiddhiManager.java:95)
at io.siddhi.distribution.editor.core.internal.DebugRuntime.createRuntime(DebugRuntime.java:201)
at io.siddhi.distribution.editor.core.internal.DebugRuntime.(DebugRuntime.java:56)
at io.siddhi.distribution.editor.core.internal.DebugProcessorService.start(DebugProcessorService.java:38)
at io.siddhi.distribution.editor.core.internal.EditorMicroservice.start(EditorMicroservice.java:761)
at io.siddhi.distribution.editor.core.internal.EditorMicroservice.startWithVariables(EditorMicroservice.java:781)
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.wso2.msf4j.internal.router.HttpMethodInfo.invokeResource(HttpMethodInfo.java:187)
at org.wso2.msf4j.internal.router.HttpMethodInfo.invoke(HttpMethodInfo.java:143)
at org.wso2.msf4j.internal.MSF4JHttpConnectorListener.dispatchMethod(MSF4JHttpConnectorListener.java:218)
at org.wso2.msf4j.internal.MSF4JHttpConnectorListener.lambda$onMessage$58(MSF4JHttpConnectorListener.java:129)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NoClassDefFoundError: org/apache/kafka/clients/producer/Producer
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:2671)
at java.lang.Class.getConstructor0(Class.java:3075)
at java.lang.Class.newInstance(Class.java:412)
at io.siddhi.core.util.SiddhiClassLoader.loadClass(SiddhiClassLoader.java:32)
at io.siddhi.core.util.SiddhiClassLoader.loadExtensionImplementation(SiddhiClassLoader.java:48)
at io.siddhi.core.util.parser.helper.DefinitionParserHelper.addEventSource(DefinitionParserHelper.java:346)
... 21 more
Caused by: java.lang.ClassNotFoundException: org.apache.kafka.clients.producer.Producer cannot be found by siddhi-io-kafka_5.0.7
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:448)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:361)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:353)
at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java:161)
at java.lang.ClassLoader.loadClass(ClassLoader.java:352)
... 28 more
Can somebody tell me what am I doing wrong? :(

Answer 1

Please make sure you had the OSGi-converted jars to the "C:\Program Files\WSO2\Enterprise Integrator\7.0.2\streaming-integrator\lib".
The OSGi-converted jar list:
kafka_2.12_2.3.0_1.0.0
kafka_clients_2.3.0_1.0.0
metrics_core_2.2.0_1.0.0
scala_library_2.12.8_1.0.0
zkclient_0.11_1.0.0
zookeeper_3.4.14_1.0.0
The, copy the original jars to to the "C:\Program Files\WSO2\Enterprise Integrator\7.0.2\streaming-integrator\samples\sample-clients\lib"
The list of original jars:
kafka_2.12-2.3.0
kafka-clients-2.3.0
metrics-core-2.2.0
scala-library-2.12.8
zkclient-0.11
zookeeper-3.4.14
In order to generate the OSGi-converted jars, copy all original jars to a folder called "source" and create an empty folder called "destination". Then run the following command in the terminal:
MINGW32 /c/Program Files/WSO2/Enterprise Integrator/7.0.2/streaming-integrator/bin
$ ./jartobundle.sh C:/DevTools/source C:/DevTools/destination
Finally, distribute the OSGis and original in accordance with the directories above.
PS1: in my case i am using kafka_2.12-2.4.1, but the basename of the jars does not change.
PS2: adapt the directories to your installation path
For more details check WSO2 documentation: Kafka transport