java.lang.NoClassDefFoundError: io/opentracing/util/GlobalTracer in v.1.2.0 about echo-sink HOT 3 OPEN

It looks like you are missing the tracing libraries. You will need to add the Jaeger Client and OpenTracing dependencies: https://github.com/scholzj/echo-sink/blob/main/pom.xml#L31-L40

I can try to have a look later if I can produce some fat-jar as an alternative. But adding these dependencies (and their dependencies) manually should get you started.

from echo-sink.

Hi,

Thank you for your advice.

It worked by adding the following jars to /opt/bitnami/kafka/libs.

jaeger-tracerresolver-1.0.0.jar                           okhttp-3.9.0.jar                      opentracing-util-0.33.0.jar
gson-2.8.2.jar                                            okio-1.13.0.jar                       libthrift-0.12.0.jar   
jaeger-client-1.0.0.jar                                   opentracing-api-0.33.0.jar            
jaeger-core-1.0.0.jar                                     opentracing-noop-0.33.0.jar           
jaeger-thrift-1.0.0.jar                                   opentracing-tracerresolver-0.1.8.jar

For those who are interested, I downloaded required jars with:
echo-sink-1.2.0/META-INF/maven/cz.scholz.kafka.connect/echo-sink$ mvn dependency:resolve

and after I put in libs folder only those libs which were not present.

I think you should provide a single uber jar with all required jars in it. Actually, this is the way that confluent recommends to ship a connector

A Kafka Connect plugin can be:

a directory on the file system that contains all required JAR files and third-party dependencies for the plugin. This is most common and is preferred.
a single uber JAR containing all of the class files for the plugin and its third-party dependencies.

Important

A plugin should never contain any libraries provided by the Kafka Connect runtime.

Source: https://docs.confluent.io/home/connect/userguide.html

Thank you.

from echo-sink.

Well, it is used mainly with Strimzi, which already packages the dependencies. And it is always better to avoid mixing dependencies since that might cause different versions to conflict etc. I might add fat-jar when I have time for it. But not sure when exactly will i get to it.

from echo-sink.