MINOR: remove ZK from code base (#529)

Author: mjsax

.semaphore/semaphore.yml

@@ -155,7 +155,7 @@ after_pipeline:
       - name: SonarQube
         commands:
           - checkout
-          - sem-version java 11
+          - if [[ $SEMAPHORE_GIT_BRANCH =~ ^7\..* ]]; then sem-version java 8; else sem-version java 17; fi
           - artifact pull workflow target-AMD
           - artifact pull workflow target-ARM
           - emit-sonarqube-data --run_only_sonar_scan

README.md

@@ -1,5 +1,9 @@
 # Kafka Streams Examples
 
+> [!NOTE]
+> This repo is replaced with [Confluent Tutorials for Apache Kafka](https://github.com/confluentinc/tutorials).
+We still "keep the lights on", but we don't improve existing examples any longer, nor do we add new example.
+
 This project contains code examples that demonstrate how to implement real-time applications and event-driven
 microservices using the Streams API of [Apache Kafka](http://kafka.apache.org/) aka Kafka Streams.
 
@@ -254,17 +258,14 @@ If you are using Eclipse, you can also right-click on `pom.xml` file and choose
 
 <a name="requirements-java"/>
 
-## Java 8+
-
-Some code examples require Java 8+, primarily because of the usage of
-[lambda expressions](https://docs.oracle.com/javase/tutorial/java/javaOO/lambdaexpressions.html).
+## Java 17+
 
 IntelliJ IDEA users:
 
 * Open _File > Project structure_
 * Select "Project" on the left.
-    * Set "Project SDK" to Java 1.8.
-    * Set "Project language level" to "8 - Lambdas, type annotations, etc."
+    * Set "Project SDK" to Java 17.
+    * Set "Project language level" to "17 - Sealed types, always-strict floating-point semantics"
 
 
 <a name="requirements-scala"/>
@@ -274,11 +275,7 @@ IntelliJ IDEA users:
 > Scala is required only for the Scala examples in this repository.  If you are a Java developer you can safely ignore
 > this section.
 
-If you want to experiment with the Scala examples in this repository, you need a version of Scala that supports Java 8
-and SAM / Java lambda (e.g. Scala 2.11 with `-Xexperimental` compiler flag, or 2.12).
-
-If you are compiling with Java 9+, you'll need to have Scala version 2.12+ to be compatible with the Java version.
-
+If you want to experiment with the Scala examples in this repository, you need a version of Scala that supports Java 17.
 
 <a name="packaging-and-running"/>
 
@@ -300,10 +297,13 @@ In a nutshell:
 ```shell
 # Ensure you have downloaded and installed Confluent Platform as per the Quickstart instructions above.
 
-# Start ZooKeeper
-$ ./bin/zookeeper-server-start ./etc/kafka/zookeeper.properties
+#Generate a Cluster UUID
+$ KAFKA_CLUSTER_ID="$(bin/kafka-storage.sh random-uuid)"
 
-# In a separate terminal, start Kafka broker
+#Format Log Directories
+$ bin/kafka-storage.sh format --standalone -t $KAFKA_CLUSTER_ID -c config/kraft/reconfig-server.properties
+
+# Start the Kafka broker
 $ ./bin/kafka-server-start ./etc/kafka/server.properties
 
 # In a separate terminal, start Confluent Schema Registry
@@ -378,17 +378,15 @@ $ mvn package # Packages the application examples into a standalone jar
 
 | Branch (this repo)                      | Confluent Platform | Apache Kafka      |
 | ----------------------------------------|--------------------|-------------------|
-| [5.4.x](../../../tree/5.4.x/)\*         | 5.4.0-SNAPSHOT     | 2.4.0-SNAPSHOT    |
-| [5.3.0-post](../../../tree/5.3.0-post/) | 5.3.0              | 2.3.0             |
-| [5.2.2-post](../../../tree/5.2.2-post/) | 5.2.2              | 2.2.1             |
-| [5.2.1-post](../../../tree/5.2.1-post/) | 5.2.1              | 2.2.1             |
-| [5.1.0-post](../../../tree/5.1.0-post/) | 5.1.0              | 2.1.0             |
-| [5.0.0-post](../../../tree/5.0.0-post/) | 5.0.0              | 2.0.0             |
-| [4.1.0-post](../../../tree/4.1.0-post/) | 4.1.0              | 1.1.0             |
-| [4.0.0-post](../../../tree/4.4.0-post/) | 4.0.0              | 1.0.0             |
-| [3.3.0-post](../../../tree/3.3.0-post/) | 3.3.0              | 0.11.0            |
-
-\*You must manually build the `2.3` version of Apache Kafka and the `5.3.x` version of Confluent Platform.  See instructions above.
+| [master](../../../tree/master/)\*       | 8.0.0-SNAPSHOT     | 4.0.0-SNAPSHOT    |
+| [7.9.x](../../../tree/7.9.x/)           | 7.9.0-SNAPSHOT     | 3.9.0             |
+| [7.8.0-post](../../../tree/7.8.0-post/) | 7.8.0              | 3.8.0             |
+| ...                                     |                    |                   |
+| [7.1.0-post](../../../tree/7.1.0-post/) | 7.1.0              | 3.1.0             |
+
+Older version prior to 7.1.0 are [not supported any longer](https://docs.confluent.io/platform/current/installation/versions-interoperability.html).
+
+\*You must manually build the `4.0` version of Apache Kafka and the `8.0.0` version of Confluent Platform.  See instructions above.
 
 The `master` branch of this repository represents active development, and may require additional steps on your side to
 make it compile.  Check this README as well as [pom.xml](pom.xml) for any such information.

pom.xml

@@ -54,7 +54,7 @@
         <chill.version>0.9.5</chill.version>
         <docker.skip-build>false</docker.skip-build>
         <docker.skip-test>false</docker.skip-test>
-        <java.version>11</java.version>
+        <java.version>17</java.version>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <scalatest.version>3.1.2</scalatest.version>
         <!-- The default is ubi8 -->
@@ -124,14 +124,6 @@
             <!-- This version must be compatible with the Scala version of the Kafka dependency. -->
             <version>${scala.version}</version>
         </dependency>
-        <dependency>
-            <!-- This could be a test-only dependency, but we keep it a compile dependency so that
-                 users are able to package the examples via `mvn package` and actually run the examples
-                 against a Kafka cluster. -->
-            <groupId>com.101tec</groupId>
-            <artifactId>zkclient</artifactId>
-            <version>0.9</version>
-        </dependency>
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-reload4j</artifactId>
@@ -181,6 +173,11 @@
             <artifactId>jackson-databind</artifactId>
             <version>${jackson.version}</version>
         </dependency>
+        <dependency>
+            <groupId>jakarta.xml.bind</groupId>
+            <artifactId>jakarta.xml.bind-api</artifactId>
+            <version>4.0.1</version>
+        </dependency>
         <!--
             This dependency is included to demonstrate the use of
             Confluent Monitoring Interceptors in conjunction with
@@ -241,6 +238,12 @@
             <classifier>test</classifier>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.apache.kafka</groupId>
+            <artifactId>kafka-test-common-runtime</artifactId>
+            <version>${kafka.version}</version>
+            <scope>test</scope>
+        </dependency>
         <dependency>
             <groupId>org.apache.kafka</groupId>
             <artifactId>kafka-streams-test-utils</artifactId>