java.lang.NoClassDefFoundError

[Gunnar34]

Hello,

I'm trying to run this connector to sync data from a compacted kafka topic to an s3 location by key. After running the "gradle build" and adding it the the connect node packages. We're seeing a strange issue when starting a connector.

WARN unhandled due to prior sendError (org.eclipse.jetty.server.HttpChannelState:787)
javax.servlet.ServletException: org.glassfish.jersey.server.ContainerException: java.lang.NoClassDefFoundError: io/aiven/kafka/connect/common/config/AivenCommonConfig
at org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:410)
at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:346)
at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:358)
at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:311)
at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:205)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:799)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:554)
at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1624)
at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1440)
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:188)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:505)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1594)
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:186)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1355)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:234)
at org.eclipse.jetty.server.handler.StatisticsHandler.handle(StatisticsHandler.java:181)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127)
at org.eclipse.jetty.server.Server.handle(Server.java:516)
at org.eclipse.jetty.server.HttpChannel.lambda$handle$1(HttpChannel.java:487)
at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:732)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:479)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:277)
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:105)
at org.eclipse.jetty.io.ssl.SslConnection$DecryptedEndPoint.onFillable(SslConnection.java:555)
at org.eclipse.jetty.io.ssl.SslConnection.onFillable(SslConnection.java:410)
at org.eclipse.jetty.io.ssl.SslConnection$2.succeeded(SslConnection.java:164)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:105)
at org.eclipse.jetty.io.ChannelEndPoint$1.run(ChannelEndPoint.java:104)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:338)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:315)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:173)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:131)
at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:409)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:883)
at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1034)
at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: org.glassfish.jersey.server.ContainerException: java.lang.NoClassDefFoundError: io/aiven/kafka/connect/common/config/AivenCommonConfig
at org.glassfish.jersey.servlet.internal.ResponseWriter.rethrow(ResponseWriter.java:255)
at org.glassfish.jersey.servlet.internal.ResponseWriter.failure(ResponseWriter.java:237)
at org.glassfish.jersey.server.ServerRuntime$Responder.process(ServerRuntime.java:438)
at org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:263)
at org.glassfish.jersey.internal.Errors$1.call(Errors.java:248)
at org.glassfish.jersey.internal.Errors$1.call(Errors.java:244)
at org.glassfish.jersey.internal.Errors.process(Errors.java:292)
at org.glassfish.jersey.internal.Errors.process(Errors.java:274)
at org.glassfish.jersey.internal.Errors.process(Errors.java:244)
at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:265)
at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:234)
at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:684)
at org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:394)
... 39 more

I first checked this class in the source code. io/aiven/kafka/connect/common/config/AivenCommonConfig - but the only definition i see is an import on line 34 in /src/main/java/o/aiven/kafka/connect/s3/config. The file path for the missing class doesn't exist and i can't find anywhere that is defining it or packaging it as a calss. Does this class exist? Or am I overlooking something obvious?

Connector config is -
{
"name": "Avien_S3_sink_conncector",
"config":
{
"connector.class": "io.aiven.kafka.connect.s3.AivenKafkaConnectS3SinkConnector",
"tasks.max": "8",
"key.converter": "org.apache.kafka.connect.storage.StringConverter",
"value.converter": "org.apache.kafka.connect.json.JsonConverter",
"topics": "TP.TOPIC.NAME.LATEST",
"value.converter.schemas.enable": "false",
"format.output.type" : "json",
"aws.s3.bucket.name" : "hs-topic-bucket",
"aws.s3.region": "us-east-1",
"format.output.fields" : "key,value",
"file.name.template" : "{{topic}}-{{partition}}-{{key}}",
"aws.sts.role.arn" : "arn:aws:iam::**:role//KAFKACONNECT",
"s3.credentials.provider.class": "io.confluent.connect.s3.auth.AwsAssumeRoleCredentialsProvider",
"aws.sts.role.session.name" : "avienconnect"
}
}

[gharris1727]

@Gunnar34 That class appears to be from a dependency: https://github.com/Aiven-Open/commons-for-apache-kafka-connect/blob/master/src/main/java/io/aiven/kafka/connect/common/config/AivenCommonConfig.java

Usually when this sort of error happens, it means that the plugin is installed incorrectly on the connect worker, and the connector is unintentionally separated from it's dependencies. For example, if you have plugin.path=/path/to/plugins, and the plugin jar and dependencies are installed at /path/to/plugins/plugin.jar and /path/to/plugins/dependency.jar, then I would expect an error like this. Instead the JARs should be installed inside a subdirectory at /path/to/plugins/some-directory/plugin.jar and /path/to/plugins/some-directory/dependency.jar.

This can also happen if you're installing connectors into the CLASSPATH, and omit the dependency jar.
Also if you're building from source, the dependencies may not be included in the output directory; A released package should include the necessary dependencies.

I hope this helps!