Downgrade project to use Java 8 for the build pipeline

.github/workflows/ci.yml

@@ -18,10 +18,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - name: Set up JDK 17
+      - name: Set up JDK 8
         uses: actions/setup-java@v2
         with:
-          java-version: '17'
+          java-version: '8'
           distribution: 'temurin'
           cache: 'maven'
       - name: Build

README.md

@@ -953,10 +953,9 @@ you will need to sign the [Contributor License Agreement](https://cla-assistant.
 In order to build from source, you will need to install maven 3.6+. You can find more about it on
 the [maven homepage](https://maven.apache.org/users/index.html).
 
-While the project targets Java 8 for compatibility purposes, for development you will need at least
-Java 11 - ideally Java 17, as that's what we use for continuous integration. We recommend installing
-any flavour of OpenJDK such
-as [Eclipse Temurin](https://projects.eclipse.org/projects/adoptium.temurin).
+The project targets Java 8 for compatibility purposes, and runs its build pipeline on Eclipse
+Temurin's Java 8 distribution. It will most likely work locally with other JDKs, but in case you
+run into build errors, you can try that distribution.
 
 Finally, you will need to [install Docker](https://docs.docker.com/get-docker/) on your local
 machine.

pom.xml

@@ -71,6 +71,7 @@
     <plugin.version.checkstyle>3.1.2</plugin.version.checkstyle>
     <plugin.version.dependency>3.2.0</plugin.version.dependency>
     <plugin.version.enforcer>3.0.0</plugin.version.enforcer>
+    <plugin.version.google-format>1.7</plugin.version.google-format>
     <plugin.version.gpg>3.0.1</plugin.version.gpg>
     <plugin.version.jar>3.2.2</plugin.version.jar>
     <plugin.version.javadoc>3.3.1</plugin.version.javadoc>
@@ -244,12 +245,6 @@
       <scope>test</scope>
     </dependency>
 
-    <dependency>
-      <groupId>io.camunda</groupId>
-      <artifactId>zeebe-test-util</artifactId>
-      <scope>test</scope>
-    </dependency>
-
     <dependency>
       <groupId>org.awaitility</groupId>
       <artifactId>awaitility</artifactId>
@@ -324,9 +319,8 @@
         <configuration>
           <java>
             <googleJavaFormat>
-              <version>1.11.0</version>
+              <version>${plugin.version.google-format}</version>
               <style>GOOGLE</style>
-              <reflowLongStrings>true</reflowLongStrings>
             </googleJavaFormat>
             <licenseHeader>
               <file>${project.basedir}/HEADER</file>
@@ -455,8 +449,17 @@
               <goal>enforce</goal>
             </goals>
             <configuration>
+              <!-- see more https://maven.apache.org/enforcer/enforcer-rules/index.html -->
               <rules>
                 <banDuplicatePomDependencyVersions/>
+                <requireJavaVersion>
+                  <version>[1.8,)</version>
+                </requireJavaVersion>
+                <requireMavenVersion>
+                  <version>[3.6,)</version>
+                </requireMavenVersion>
+                <requireReleaseDeps/>
+                <requireUpperBoundDeps/>
               </rules>
             </configuration>
           </execution>

src/test/java/io/zeebe/containers/ZeebeBrokerNodeTest.java

@@ -23,8 +23,8 @@
 import io.camunda.zeebe.client.api.response.ProcessInstanceEvent;
 import io.camunda.zeebe.model.bpmn.Bpmn;
 import io.camunda.zeebe.model.bpmn.BpmnModelInstance;
-import io.camunda.zeebe.test.util.asserts.TopologyAssert;
 import io.zeebe.containers.util.TestUtils;
+import io.zeebe.containers.util.TopologyAssert;
 import java.io.IOException;
 import java.nio.file.Path;
 import java.time.Duration;
@@ -166,7 +166,7 @@ private void awaitUntilTopologyIsComplete(final ZeebeClient client) {
         .untilAsserted(
             () ->
                 TopologyAssert.assertThat(client.newTopologyRequest().send().join())
-                    .isComplete(1, 1));
+                    .isComplete(1, 1, 1));
   }
 
   private static Stream<Arguments> reuseDataTestCases() {

src/test/java/io/zeebe/containers/cluster/ZeebeClusterTest.java

@@ -19,8 +19,8 @@
 
 import io.camunda.zeebe.client.ZeebeClient;
 import io.camunda.zeebe.client.api.response.Topology;
-import io.camunda.zeebe.test.util.asserts.TopologyAssert;
 import io.zeebe.containers.ZeebeGatewayNode;
+import io.zeebe.containers.util.TopologyAssert;
 import java.util.Optional;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.Test;
@@ -59,7 +59,7 @@ void shouldStartSingleNodeCluster() {
     TopologyAssert.assertThat(topology)
         .as("the topology is complete for a one broker, one partition cluster")
         .hasBrokersCount(1)
-        .isComplete(1, 1);
+        .isComplete(1, 1, 1);
   }
 
   @Test
@@ -93,7 +93,7 @@ void shouldStartClusterWithEmbeddedGateways() {
         TopologyAssert.assertThat(topology)
             .as("the topology is complete with 2 partitions and 2 brokers")
             .hasBrokersCount(2)
-            .isComplete(2, 2);
+            .isComplete(2, 2, 2);
       }
     }
   }
@@ -125,7 +125,7 @@ void shouldStartClusterWithStandaloneGateway() {
       TopologyAssert.assertThat(topology)
           .as("the topology is complete for a one broker, one partition cluster")
           .hasBrokersCount(1)
-          .isComplete(1, 1);
+          .isComplete(1, 1, 1);
     }
   }
 
@@ -160,8 +160,8 @@ void shouldStartClusterWithMixedGateways() {
             .isEqualTo(1);
         TopologyAssert.assertThat(topology)
             .as("the topology is complete for a one broker, one partition cluster")
-            .hasBrokersCount(1)
-            .isComplete(1, 1);
+            .isComplete(1, 1, 1)
+            .hasBrokersCount(1);
       }
     }
   }