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scylladb / kafka-connect-scylladb

Kafka Connect Scylladb Sink
Apache License 2.0
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Connector failed to start with java.lang.NoClassDefFoundError: com/datastax/driver/core/Statement #83

Closed mango009 closed 1 year ago

mango009 commented 1 year ago

First problem:

The documentation on the Scylla website and the quick start in the repo seems wrong to me. It stated:

After completion of the above steps, a folder by the name of ‘components’ will be created in the target folder of the source code folder. The Connector jar files are present in {source-code-folder}/target/components/packages/[jar-files]

But after doing mvn install -DskipTests the the packages directory actually looks like:

target/components/packages/
├── ScyllaDB-kafka-connect-scylladb-1.0.1-preview
│   └── ScyllaDB-kafka-connect-scylladb-1.0.1-preview
│       ├── doc
│       │   ├── LICENSE
│       │   └── README.md
│       ├── etc
│       │   ├── connect-avro-standalone-local.properties
│       │   ├── connect-log4j.properties
│       │   └── scylladb-sink-quickstart.properties
│       ├── lib
│       │   ├── animal-sniffer-annotations-1.14.jar
│       │   ├── asm-5.0.3.jar
│       │   ├── asm-analysis-5.0.3.jar
│       │   ├── asm-commons-5.0.3.jar
│       │   ├── asm-tree-5.0.3.jar
......

And kafka-connect-scylladb-1.0.1.jar it is generated right under target/components/.

Second problem:

I created a directory and copy all the jars under target/components/packages/ScyllaDB-kafka-connect-scylladb-1.0.1-preview/ScyllaDB-kafka-connect-scylladb-1.0.1-preview/lib and kafka-connect-scylladb-1.0.1.jar to the directory.

I then started the connector but getting an exception (sorry the stack trace is long):

[2022-11-27 14:17:45,142] INFO Loading plugin from: /Users/mango/tools/confluent-7.3.0/share/scylla-connectors/netty-transport-4.1.77.Final.jar (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:277)
[2022-11-27 14:17:45,171] INFO Registered loader: PluginClassLoader{pluginLocation=file:/Users/mango/tools/confluent-7.3.0/share/scylla-connectors/netty-transport-4.1.77.Final.jar} (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:299)
[2022-11-27 14:17:45,171] INFO Loading plugin from: /Users/mango/tools/confluent-7.3.0/share/scylla-connectors/jffi-1.2.16-native.jar (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:277)
[2022-11-27 14:17:45,172] INFO Registered loader: PluginClassLoader{pluginLocation=file:/Users/mango/tools/confluent-7.3.0/share/scylla-connectors/jffi-1.2.16-native.jar} (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:299)
[2022-11-27 14:17:45,172] INFO Loading plugin from: /Users/mango/tools/confluent-7.3.0/share/scylla-connectors/jsr305-1.3.9.jar (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:277)
[2022-11-27 14:17:45,175] INFO Registered loader: PluginClassLoader{pluginLocation=file:/Users/mango/tools/confluent-7.3.0/share/scylla-connectors/jsr305-1.3.9.jar} (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:299)
[2022-11-27 14:17:45,176] INFO Loading plugin from: /Users/mango/tools/confluent-7.3.0/share/scylla-connectors/jffi-1.2.16.jar (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:277)
[2022-11-27 14:17:45,184] INFO Registered loader: PluginClassLoader{pluginLocation=file:/Users/mango/tools/confluent-7.3.0/share/scylla-connectors/jffi-1.2.16.jar} (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:299)
[2022-11-27 14:17:45,184] INFO Loading plugin from: /Users/mango/tools/confluent-7.3.0/share/scylla-connectors/netty-common-4.1.77.Final.jar (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:277)
[2022-11-27 14:17:45,207] INFO Registered loader: PluginClassLoader{pluginLocation=file:/Users/mango/tools/confluent-7.3.0/share/scylla-connectors/netty-common-4.1.77.Final.jar} (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:299)
[2022-11-27 14:17:45,207] INFO Loading plugin from: /Users/mango/tools/confluent-7.3.0/share/scylla-connectors/jnr-x86asm-1.0.2.jar (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:277)
[2022-11-27 14:17:45,215] INFO Registered loader: PluginClassLoader{pluginLocation=file:/Users/mango/tools/confluent-7.3.0/share/scylla-connectors/jnr-x86asm-1.0.2.jar} (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:299)
[2022-11-27 14:17:45,215] INFO Loading plugin from: /Users/mango/tools/confluent-7.3.0/share/scylla-connectors/netty-tcnative-2.0.7.Final.jar (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:277)
[2022-11-27 14:17:45,217] INFO Registered loader: PluginClassLoader{pluginLocation=file:/Users/mango/tools/confluent-7.3.0/share/scylla-connectors/netty-tcnative-2.0.7.Final.jar} (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:299)
[2022-11-27 14:17:45,217] INFO Loading plugin from: /Users/mango/tools/confluent-7.3.0/share/scylla-connectors/slf4j-api-1.7.25.jar (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:277)
[2022-11-27 14:17:45,221] INFO Registered loader: PluginClassLoader{pluginLocation=file:/Users/mango/tools/confluent-7.3.0/share/scylla-connectors/slf4j-api-1.7.25.jar} (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:299)
[2022-11-27 14:17:45,221] INFO Loading plugin from: /Users/mango/tools/confluent-7.3.0/share/scylla-connectors/error_prone_annotations-2.1.3.jar (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:277)
[2022-11-27 14:17:45,223] INFO Registered loader: PluginClassLoader{pluginLocation=file:/Users/mango/tools/confluent-7.3.0/share/scylla-connectors/error_prone_annotations-2.1.3.jar} (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:299)
[2022-11-27 14:17:45,223] INFO Loading plugin from: /Users/mango/tools/confluent-7.3.0/share/scylla-connectors/jackson-core-2.13.4.jar (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:277)
[2022-11-27 14:17:45,236] INFO Registered loader: PluginClassLoader{pluginLocation=file:/Users/mango/tools/confluent-7.3.0/share/scylla-connectors/jackson-core-2.13.4.jar} (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:299)
[2022-11-27 14:17:45,236] INFO Loading plugin from: /Users/mango/tools/confluent-7.3.0/share/scylla-connectors/asm-commons-5.0.3.jar (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:277)
[2022-11-27 14:17:45,240] INFO Registered loader: PluginClassLoader{pluginLocation=file:/Users/mango/tools/confluent-7.3.0/share/scylla-connectors/asm-commons-5.0.3.jar} (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:299)
[2022-11-27 14:17:45,240] INFO Loading plugin from: /Users/mango/tools/confluent-7.3.0/share/scylla-connectors/jnr-constants-0.9.9.jar (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:277)
[2022-11-27 14:17:45,248] INFO Registered loader: PluginClassLoader{pluginLocation=file:/Users/mango/tools/confluent-7.3.0/share/scylla-connectors/jnr-constants-0.9.9.jar} (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:299)
[2022-11-27 14:17:45,249] INFO Loading plugin from: /Users/mango/tools/confluent-7.3.0/share/scylla-connectors/netty-codec-4.1.77.Final.jar (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:277)
[2022-11-27 14:17:45,259] INFO Registered loader: PluginClassLoader{pluginLocation=file:/Users/mango/tools/confluent-7.3.0/share/scylla-connectors/netty-codec-4.1.77.Final.jar} (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:299)
[2022-11-27 14:17:45,259] INFO Loading plugin from: /Users/mango/tools/confluent-7.3.0/share/scylla-connectors/jackson-annotations-2.13.4.jar (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:277)
[2022-11-27 14:17:45,264] INFO Registered loader: PluginClassLoader{pluginLocation=file:/Users/mango/tools/confluent-7.3.0/share/scylla-connectors/jackson-annotations-2.13.4.jar} (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:299)
[2022-11-27 14:17:45,264] INFO Loading plugin from: /Users/mango/tools/confluent-7.3.0/share/scylla-connectors/scylla-driver-extras-3.11.0.1.jar (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:277)
[2022-11-27 14:17:45,269] INFO Registered loader: PluginClassLoader{pluginLocation=file:/Users/mango/tools/confluent-7.3.0/share/scylla-connectors/scylla-driver-extras-3.11.0.1.jar} (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:299)
[2022-11-27 14:17:45,269] INFO Loading plugin from: /Users/mango/tools/confluent-7.3.0/share/scylla-connectors/netty-buffer-4.1.77.Final.jar (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:277)
[2022-11-27 14:17:45,277] INFO Registered loader: PluginClassLoader{pluginLocation=file:/Users/mango/tools/confluent-7.3.0/share/scylla-connectors/netty-buffer-4.1.77.Final.jar} (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:299)
[2022-11-27 14:17:45,278] INFO Loading plugin from: /Users/mango/tools/confluent-7.3.0/share/scylla-connectors/connect-utils-0.1.18.jar (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:277)
[2022-11-27 14:17:45,280] INFO Registered loader: PluginClassLoader{pluginLocation=file:/Users/mango/tools/confluent-7.3.0/share/scylla-connectors/connect-utils-0.1.18.jar} (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:299)
[2022-11-27 14:17:45,280] INFO Loading plugin from: /Users/mango/tools/confluent-7.3.0/share/scylla-connectors/checker-compat-qual-2.0.0.jar (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:277)
[2022-11-27 14:17:45,282] INFO Registered loader: PluginClassLoader{pluginLocation=file:/Users/mango/tools/confluent-7.3.0/share/scylla-connectors/checker-compat-qual-2.0.0.jar} (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:299)
[2022-11-27 14:17:45,282] INFO Loading plugin from: /Users/mango/tools/confluent-7.3.0/share/scylla-connectors/asm-util-5.0.3.jar (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:277)
[2022-11-27 14:17:45,286] INFO Registered loader: PluginClassLoader{pluginLocation=file:/Users/mango/tools/confluent-7.3.0/share/scylla-connectors/asm-util-5.0.3.jar} (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:299)
[2022-11-27 14:17:45,286] INFO Loading plugin from: /Users/mango/tools/confluent-7.3.0/share/scylla-connectors/j2objc-annotations-1.1.jar (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:277)
[2022-11-27 14:17:45,287] INFO Registered loader: PluginClassLoader{pluginLocation=file:/Users/mango/tools/confluent-7.3.0/share/scylla-connectors/j2objc-annotations-1.1.jar} (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:299)
[2022-11-27 14:17:45,287] INFO Loading plugin from: /Users/mango/tools/confluent-7.3.0/share/scylla-connectors/jackson-databind-2.13.4.2.jar (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:277)
[2022-11-27 14:17:45,333] INFO Registered loader: PluginClassLoader{pluginLocation=file:/Users/mango/tools/confluent-7.3.0/share/scylla-connectors/jackson-databind-2.13.4.2.jar} (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:299)
[2022-11-27 14:17:45,333] INFO Loading plugin from: /Users/mango/tools/confluent-7.3.0/share/scylla-connectors/metrics-core-3.2.2.jar (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:277)
[2022-11-27 14:17:45,338] INFO Registered loader: PluginClassLoader{pluginLocation=file:/Users/mango/tools/confluent-7.3.0/share/scylla-connectors/metrics-core-3.2.2.jar} (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:299)
[2022-11-27 14:17:45,338] INFO Loading plugin from: /Users/mango/tools/confluent-7.3.0/share/scylla-connectors/asm-5.0.3.jar (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:277)
[2022-11-27 14:17:45,341] INFO Registered loader: PluginClassLoader{pluginLocation=file:/Users/mango/tools/confluent-7.3.0/share/scylla-connectors/asm-5.0.3.jar} (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:299)
[2022-11-27 14:17:45,342] INFO Loading plugin from: /Users/mango/tools/confluent-7.3.0/share/scylla-connectors/asm-analysis-5.0.3.jar (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:277)
[2022-11-27 14:17:45,344] INFO Registered loader: PluginClassLoader{pluginLocation=file:/Users/mango/tools/confluent-7.3.0/share/scylla-connectors/asm-analysis-5.0.3.jar} (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:299)
[2022-11-27 14:17:45,344] INFO Loading plugin from: /Users/mango/tools/confluent-7.3.0/share/scylla-connectors/guava-24.1.1-jre.jar (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:277)
[2022-11-27 14:17:45,409] INFO Registered loader: PluginClassLoader{pluginLocation=file:/Users/mango/tools/confluent-7.3.0/share/scylla-connectors/guava-24.1.1-jre.jar} (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:299)
[2022-11-27 14:17:45,409] INFO Loading plugin from: /Users/mango/tools/confluent-7.3.0/share/scylla-connectors/netty-resolver-4.1.77.Final.jar (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:277)
[2022-11-27 14:17:45,411] INFO Registered loader: PluginClassLoader{pluginLocation=file:/Users/mango/tools/confluent-7.3.0/share/scylla-connectors/netty-resolver-4.1.77.Final.jar} (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:299)
[2022-11-27 14:17:45,411] INFO Loading plugin from: /Users/mango/tools/confluent-7.3.0/share/scylla-connectors/freemarker-2.3.25-incubating.jar (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:277)
[2022-11-27 14:17:45,447] INFO Registered loader: PluginClassLoader{pluginLocation=file:/Users/mango/tools/confluent-7.3.0/share/scylla-connectors/freemarker-2.3.25-incubating.jar} (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:299)
[2022-11-27 14:17:45,447] INFO Loading plugin from: /Users/mango/tools/confluent-7.3.0/share/scylla-connectors/animal-sniffer-annotations-1.14.jar (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:277)
[2022-11-27 14:17:45,448] INFO Registered loader: PluginClassLoader{pluginLocation=file:/Users/mango/tools/confluent-7.3.0/share/scylla-connectors/animal-sniffer-annotations-1.14.jar} (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:299)
[2022-11-27 14:17:45,448] INFO Loading plugin from: /Users/mango/tools/confluent-7.3.0/share/scylla-connectors/netty-handler-4.1.77.Final.jar (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:277)
[2022-11-27 14:17:45,462] INFO Registered loader: PluginClassLoader{pluginLocation=file:/Users/mango/tools/confluent-7.3.0/share/scylla-connectors/netty-handler-4.1.77.Final.jar} (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:299)
[2022-11-27 14:17:45,463] INFO Loading plugin from: /Users/mango/tools/confluent-7.3.0/share/scylla-connectors/jnr-ffi-2.1.7.jar (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:277)
[2022-11-27 14:17:45,479] INFO Registered loader: PluginClassLoader{pluginLocation=file:/Users/mango/tools/confluent-7.3.0/share/scylla-connectors/jnr-ffi-2.1.7.jar} (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:299)
[2022-11-27 14:17:45,479] INFO Loading plugin from: /Users/mango/tools/confluent-7.3.0/share/scylla-connectors/json-20160810.jar (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:277)
[2022-11-27 14:17:45,482] INFO Registered loader: PluginClassLoader{pluginLocation=file:/Users/mango/tools/confluent-7.3.0/share/scylla-connectors/json-20160810.jar} (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:299)
[2022-11-27 14:17:45,482] INFO Loading plugin from: /Users/mango/tools/confluent-7.3.0/share/scylla-connectors/scylla-driver-core-3.11.2.0.jar (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:277)
[2022-11-27 14:17:45,513] INFO Registered loader: PluginClassLoader{pluginLocation=file:/Users/mango/tools/confluent-7.3.0/share/scylla-connectors/scylla-driver-core-3.11.2.0.jar} (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:299)
[2022-11-27 14:17:45,514] INFO Loading plugin from: /Users/mango/tools/confluent-7.3.0/share/scylla-connectors/netty-transport-native-epoll-4.1.77.Final.jar (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:277)
[2022-11-27 14:17:45,515] INFO Registered loader: PluginClassLoader{pluginLocation=file:/Users/mango/tools/confluent-7.3.0/share/scylla-connectors/netty-transport-native-epoll-4.1.77.Final.jar} (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:299)
[2022-11-27 14:17:45,515] INFO Loading plugin from: /Users/mango/tools/confluent-7.3.0/share/scylla-connectors/netty-transport-native-unix-common-4.1.77.Final.jar (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:277)
[2022-11-27 14:17:45,517] INFO Registered loader: PluginClassLoader{pluginLocation=file:/Users/mango/tools/confluent-7.3.0/share/scylla-connectors/netty-transport-native-unix-common-4.1.77.Final.jar} (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:299)
[2022-11-27 14:17:45,518] INFO Loading plugin from: /Users/mango/tools/confluent-7.3.0/share/scylla-connectors/jnr-posix-3.0.44.jar (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:277)
[2022-11-27 14:17:45,526] INFO Registered loader: PluginClassLoader{pluginLocation=file:/Users/mango/tools/confluent-7.3.0/share/scylla-connectors/jnr-posix-3.0.44.jar} (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:299)
[2022-11-27 14:17:45,526] INFO Loading plugin from: /Users/mango/tools/confluent-7.3.0/share/scylla-connectors/netty-transport-classes-epoll-4.1.77.Final.jar (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:277)
[2022-11-27 14:17:45,534] INFO Registered loader: PluginClassLoader{pluginLocation=file:/Users/mango/tools/confluent-7.3.0/share/scylla-connectors/netty-transport-classes-epoll-4.1.77.Final.jar} (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:299)
[2022-11-27 14:17:45,534] INFO Loading plugin from: /Users/mango/tools/confluent-7.3.0/share/scylla-connectors/kafka-connect-scylladb-1.0.1.jar (org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader:277)
[2022-11-27 14:17:45,537] ERROR Stopping due to error (org.apache.kafka.connect.cli.ConnectStandalone:126)
java.lang.NoClassDefFoundError: com/datastax/driver/core/Statement
    at java.base/java.lang.Class.getDeclaredConstructors0(Native Method)
    at java.base/java.lang.Class.privateGetDeclaredConstructors(Class.java:3373)
    at java.base/java.lang.Class.getConstructor0(Class.java:3578)
    at java.base/java.lang.Class.getDeclaredConstructor(Class.java:2754)
    at org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader.versionFor(DelegatingClassLoader.java:441)
    at org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader.getPluginDesc(DelegatingClassLoader.java:405)
    at org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader.scanPluginPath(DelegatingClassLoader.java:366)
    at org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader.scanUrlsAndAddPlugins(DelegatingClassLoader.java:298)
    at org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader.registerPlugin(DelegatingClassLoader.java:291)
    at org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader.initPluginLoader(DelegatingClassLoader.java:260)
    at org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader.initLoaders(DelegatingClassLoader.java:238)
    at org.apache.kafka.connect.runtime.isolation.Plugins.<init>(Plugins.java:60)
    at org.apache.kafka.connect.cli.ConnectStandalone.main(ConnectStandalone.java:78)
Caused by: java.lang.ClassNotFoundException: com.datastax.driver.core.Statement
    at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:445)
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:587)
    at org.apache.kafka.connect.runtime.isolation.PluginClassLoader.loadClass(PluginClassLoader.java:103)
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:520)
    ... 13 more
Bouncheck commented 1 year ago

Hi, this seems to be a misconfiguration issue. In your case copying over topmost ScyllaDB-kafka-connect-scylladb-1.0.1-preview folder, the one inside packages directory should suffice.

I can see that quickstart document seems a little unclear about this part, so I've modified it slightly in a recent pull request. Hopefully that helps.

What I think happened in your case is that files you copied over did not get recognized as parts of a single component and therefore ended up isolated from each other and that's why connector cannot see Statement that's inside another .jar file. The package under components directory will contain all necessary dependencies and kafka-connect-scylladb-<version>.jar will also be present in lib subdirectory.