diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index b23c8f32..c3defcaf 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -17,11 +17,11 @@ jobs:
           persist-credentials: false
           fetch-depth: 0
 
-      - name: Set up JDK 11
+      - name: Set up JDK 17
         uses: actions/setup-java@v2
         with:
           distribution: 'temurin'
-          java-version: '11.0'
+          java-version: '17.0'
           cache: 'gradle'
 
       - name: Get new version
@@ -57,7 +57,7 @@ jobs:
         uses: actions/setup-java@v2
         with:
           distribution: 'temurin'
-          java-version: '11.0'
+          java-version: '17.0'
           cache: 'gradle'
 
       - name: Tag release commit
diff --git a/.github/workflows/voter.yml b/.github/workflows/voter.yml
index fa056c33..6f34a57a 100644
--- a/.github/workflows/voter.yml
+++ b/.github/workflows/voter.yml
@@ -17,7 +17,7 @@ jobs:
 
     strategy:
       matrix:
-        java: ['11.0']
+        java: ['11.0', '17.0']
         platform: [ubuntu-18.04] # macOS-latest, windows-latest
 
     steps:
@@ -25,7 +25,7 @@ jobs:
       with:
         fetch-depth: 0
 
-    - name: Set up JDK 11
+    - name: Set up JDK ${{ matrix.java }}
       uses: actions/setup-java@v2
       with:
         distribution: 'temurin'
diff --git a/build.gradle b/build.gradle
index 5a40c9f3..53ae8e13 100644
--- a/build.gradle
+++ b/build.gradle
@@ -143,8 +143,7 @@ task annotationProcessing(type: JavaCompile, group: 'build') {
     destinationDirectory = project.file('src/generated/java')
     options.compilerArgs = [
         "-proc:only",
-        "-processor", "io.vertx.codegen.CodeGenProcessor",
-        "-Acodegen.output=${project.projectDir}/src/main"
+        "-processor", "io.vertx.codegen.CodeGenProcessor"
     ]
 }
 
@@ -194,6 +193,9 @@ clean {
 // ############ Test Phase
 
 test {
+    // Is required for ReflectionsHelper
+    jvmArgs += ['--add-opens', 'java.base/java.lang.reflect=ALL-UNNAMED']
+
     // deactivate parallel execution of tests temporary until parallel execution works again
     if (false && !org.gradle.nativeplatform.platform.internal.DefaultNativePlatform.getCurrentOperatingSystem().isMacOsX()) {
         systemProperties = [
@@ -300,8 +302,16 @@ tasks.withType(Javadoc) {
     doFirst {
         gradle.services.get(LoggingOutputInternal).addOutputEventListener(new OutputEventListener() {
             void onOutput(OutputEvent event) {
-                if (event.toString() =~ " warning: ") {
-                    exceptions << "Javadoc warning: ${event.toString()}"
+                String eventString = event.toString()
+                if (eventString =~ " warning: ") {
+                    if (eventString =~ " warning: no comment") {
+                        // Ignore warnings if a class is missing a JavaDoc,
+                        // therefore we have checkstyle
+                        // With Java 18 we can also suppress this warnings in the console
+                        // https://bugs.openjdk.java.net/browse/JDK-8189591
+                    } else {
+                        exceptions << "Javadoc warning: ${event.toString()}"
+                    }
                 }
             }
         })
diff --git a/gradle.properties b/gradle.properties
index 2aab3de6..9448daa3 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1 +1,6 @@
-org.gradle.jvmargs=-Xmx2g -XX:MaxMetaspaceSize=1g
+org.gradle.jvmargs=-Xmx2g -XX:MaxMetaspaceSize=1g \
+  --add-exports jdk.compiler/com.sun.tools.javac.api\=ALL-UNNAMED \
+  --add-exports jdk.compiler/com.sun.tools.javac.file\=ALL-UNNAMED \
+  --add-exports jdk.compiler/com.sun.tools.javac.parser\=ALL-UNNAMED \
+  --add-exports jdk.compiler/com.sun.tools.javac.tree\=ALL-UNNAMED \
+  --add-exports jdk.compiler/com.sun.tools.javac.util\=ALL-UNNAMED
diff --git a/src/test/java/io/neonbee/entity/EntityVerticleTest.java b/src/test/java/io/neonbee/entity/EntityVerticleTest.java
index 91f93a54..805c0863 100644
--- a/src/test/java/io/neonbee/entity/EntityVerticleTest.java
+++ b/src/test/java/io/neonbee/entity/EntityVerticleTest.java
@@ -205,7 +205,7 @@ void requestEntityWithConsolidationVerticleTest(VertxTestContext testContext) {
                             new FullQualifiedName(dq.getHeader(ConsolidationVerticle.ENTITY_TYPE_NAME_HEADER));
                     assertThat(entityTypeName).isEqualTo(EntityVerticleImpl1.FQN_ERP_CUSTOMERS);
                     testContext.completeNow();
-                    return null;
+                    return new EntityWrapper(EntityVerticleImpl1.FQN_ERP_CUSTOMERS, (Entity) null);
                 });
 
         undeployVerticles(ConsolidationVerticle.class).compose(v -> deployVerticle(dummy))
diff --git a/src/test/java/io/neonbee/test/helper/ReflectionHelper.java b/src/test/java/io/neonbee/test/helper/ReflectionHelper.java
index b8d87c26..124d8223 100644
--- a/src/test/java/io/neonbee/test/helper/ReflectionHelper.java
+++ b/src/test/java/io/neonbee/test/helper/ReflectionHelper.java
@@ -1,5 +1,10 @@
 package io.neonbee.test.helper;
 
+import static java.lang.invoke.MethodHandles.lookup;
+import static java.lang.invoke.MethodHandles.privateLookupIn;
+
+import java.lang.invoke.MethodHandles.Lookup;
+import java.lang.invoke.VarHandle;
 import java.lang.reflect.Field;
 import java.lang.reflect.Modifier;
 
@@ -135,9 +140,9 @@ private static Class<?> resolveClass(Object object) {
     }
 
     private static void removeFinalModifier(Field field) throws NoSuchFieldException, IllegalAccessException {
-        Field modifiersField = Field.class.getDeclaredField("modifiers");
-        modifiersField.setAccessible(true);
-        modifiersField.setInt(field, field.getModifiers() & ~Modifier.FINAL);
+        Lookup lookup = privateLookupIn(Field.class, lookup());
+        VarHandle modifiers = lookup.findVarHandle(Field.class, "modifiers", int.class);
+        modifiers.set(field, field.getModifiers() & ~Modifier.FINAL);
     }
 
     private ReflectionHelper() {