diff --git a/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng4745PluginVersionUpdateTest.java b/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng4745PluginVersionUpdateTest.java
index 888a1953e309..aaa04de8ca9b 100644
--- a/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng4745PluginVersionUpdateTest.java
+++ b/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng4745PluginVersionUpdateTest.java
@@ -49,7 +49,7 @@ public void testitRepoPolicyAlways() throws Exception {
 
         Verifier verifier = newVerifier(testDir.getAbsolutePath());
         verifier.setAutoclean(false);
-        verifier.setForkJvm(true);
+        verifier.setForkJvm(true); // TODO: why?
         verifier.deleteArtifacts("org.apache.maven.its.mng4745");
         verifier.addCliArgument("-s");
         verifier.addCliArgument("settings.xml");
@@ -84,7 +84,7 @@ public void testitRepoPolicyNever() throws Exception {
 
         Verifier verifier = newVerifier(testDir.getAbsolutePath());
         verifier.setAutoclean(false);
-        verifier.setForkJvm(true);
+        verifier.setForkJvm(true); // TODO: why?
         verifier.deleteArtifacts("org.apache.maven.its.mng4745");
         verifier.addCliArgument("-s");
         verifier.addCliArgument("settings.xml");
@@ -119,7 +119,7 @@ public void testitForceUpdate() throws Exception {
 
         Verifier verifier = newVerifier(testDir.getAbsolutePath());
         verifier.setAutoclean(false);
-        verifier.setForkJvm(true);
+        verifier.setForkJvm(true); // TODO: why?
         verifier.deleteArtifacts("org.apache.maven.its.mng4745");
         verifier.addCliArgument("-U");
         verifier.addCliArgument("-s");
diff --git a/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng4936EventSpyTest.java b/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng4936EventSpyTest.java
index d17edfb2887f..6d946fc7ff78 100644
--- a/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng4936EventSpyTest.java
+++ b/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng4936EventSpyTest.java
@@ -46,7 +46,7 @@ public void testit() throws Exception {
         File testDir = extractResources("/mng-4936");
 
         Verifier verifier = newVerifier(testDir.getAbsolutePath());
-        verifier.setForkJvm(true);
+        verifier.setForkJvm(true); // maven.ext.class.path is not unloaded
         verifier.setAutoclean(false);
         verifier.deleteDirectory("target");
         verifier.addCliArgument("-Dmaven.ext.class.path=spy-0.1.jar");
diff --git a/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng5208EventSpyParallelTest.java b/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng5208EventSpyParallelTest.java
index f5be50423a41..af4629d58a8d 100644
--- a/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng5208EventSpyParallelTest.java
+++ b/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng5208EventSpyParallelTest.java
@@ -44,7 +44,7 @@ public void testCorrectModuleFails() throws Exception {
         spy.execute();
 
         Verifier verifier = newVerifier(testDir.getAbsolutePath() + "/project");
-        verifier.setForkJvm(true);
+        verifier.setForkJvm(true); // maven.ext.class.path used
         verifier.setAutoclean(false);
         verifier.deleteDirectory("target");
         verifier.addCliArgument("-Dmaven.ext.class.path=../spy/target/event-spy-0.0.1-SNAPSHOT.jar");
diff --git a/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng5581LifecycleMappingDelegate.java b/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng5581LifecycleMappingDelegate.java
index b5b3cbc7b24f..ca5c967fb8aa 100644
--- a/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng5581LifecycleMappingDelegate.java
+++ b/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng5581LifecycleMappingDelegate.java
@@ -58,9 +58,8 @@ public void testCustomLifecycle() throws Exception {
 
         // run custom "test-only" build phase
         verifier = newVerifier(projectDir.getAbsolutePath());
-        verifier = newVerifier(projectDir.getAbsolutePath());
         verifier.setLogFileName("test-only-log.txt");
-        verifier.setForkJvm(true);
+        verifier.setForkJvm(true); // TODO: why?
         verifier.addCliArgument("-X");
         verifier.addCliArgument("test-only");
         verifier.execute();
diff --git a/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng6071GetResourceWithCustomPom.java b/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng6071GetResourceWithCustomPom.java
index e6ddde8f650e..693f371aab8d 100644
--- a/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng6071GetResourceWithCustomPom.java
+++ b/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng6071GetResourceWithCustomPom.java
@@ -43,7 +43,7 @@ public void testRunCustomPomWithDot() throws Exception {
         Verifier verifier = newVerifier(testDir.getAbsolutePath());
         verifier.addCliArgument("-f");
         verifier.addCliArgument("./pom.xml");
-        verifier.setForkJvm(true);
+        verifier.setForkJvm(true); // TODO: why?
         verifier.addCliArgument("verify");
         verifier.execute();
         verifier.verifyErrorFreeLog();
diff --git a/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng6090CIFriendlyTest.java b/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng6090CIFriendlyTest.java
index 89dbef3eb47b..8b975b40cd48 100644
--- a/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng6090CIFriendlyTest.java
+++ b/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng6090CIFriendlyTest.java
@@ -77,7 +77,7 @@ public void testitShouldResolveTheDependenciesWithBuildConsumer() throws Excepti
 
         Verifier verifier = newVerifier(testDir.getAbsolutePath(), false);
         verifier.setAutoclean(false);
-        verifier.setForkJvm(true);
+        verifier.setForkJvm(true); // TODO: why?
 
         verifier.addCliArgument("-Drevision=1.2");
         verifier.addCliArgument("-Dmaven.consumerpom=true");
@@ -88,7 +88,7 @@ public void testitShouldResolveTheDependenciesWithBuildConsumer() throws Excepti
 
         verifier = newVerifier(testDir.getAbsolutePath(), false);
         verifier.setAutoclean(false);
-        verifier.setForkJvm(true);
+        verifier.setForkJvm(true); // TODO: why?
 
         verifier.addCliArgument("-Drevision=1.2");
         verifier.addCliArgument("-pl");
diff --git a/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng6255FixConcatLines.java b/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng6255FixConcatLines.java
index 02cef52d1e76..928ff99fbf5e 100644
--- a/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng6255FixConcatLines.java
+++ b/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng6255FixConcatLines.java
@@ -77,7 +77,7 @@ protected void runWithLineEndings(String lineEndings) throws Exception {
         Verifier verifier = newVerifier(baseDir.getAbsolutePath());
         verifier.addCliArgument(
                 "-Dexpression.outputFile=" + new File(baseDir, "expression.properties").getAbsolutePath());
-        verifier.setForkJvm(true);
+        verifier.setForkJvm(true); // custom .mvn/jvm.config
         verifier.addCliArgument("validate");
         verifier.execute();
         verifier.verifyErrorFreeLog();
diff --git a/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng6330RelativePath.java b/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng6330RelativePath.java
index 0500d376838e..3e71456e19b9 100644
--- a/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng6330RelativePath.java
+++ b/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng6330RelativePath.java
@@ -39,7 +39,7 @@ public void testRelativePath() throws Exception {
         File testDir = extractResources("/mng-6330-relative-path");
 
         Verifier verifier = newVerifier(testDir.getAbsolutePath());
-        verifier.setForkJvm(true);
+        verifier.setForkJvm(true); // TODO: why?
 
         try {
             verifier.addCliArgument("validate");
diff --git a/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng6558ToolchainsBuildingEventTest.java b/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng6558ToolchainsBuildingEventTest.java
index 4a910879b053..3070162a02c7 100644
--- a/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng6558ToolchainsBuildingEventTest.java
+++ b/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng6558ToolchainsBuildingEventTest.java
@@ -44,7 +44,7 @@ public void testit() throws Exception {
         File testDir = extractResources("/mng-6558");
 
         Verifier verifier = newVerifier(testDir.getAbsolutePath());
-        verifier.setForkJvm(true);
+        verifier.setForkJvm(true); // maven.ext.class.path used
         verifier.setAutoclean(false);
         verifier.deleteDirectory("target");
         verifier.addCliArgument("-Dmaven.ext.class.path=spy-0.1.jar");
diff --git a/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng7228LeakyModelTest.java b/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng7228LeakyModelTest.java
index f600da2ae94e..af1812d0578c 100644
--- a/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng7228LeakyModelTest.java
+++ b/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng7228LeakyModelTest.java
@@ -40,7 +40,7 @@ void testLeakyModel() throws Exception {
         File testDir = extractResources("/mng-7228-leaky-model");
 
         Verifier verifier = newVerifier(testDir.getAbsolutePath());
-        verifier.setForkJvm(true);
+        verifier.setForkJvm(true); // TODO: why?
 
         verifier.addCliArgument("-e");
         verifier.addCliArgument("-s");
diff --git a/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng7470ResolverTransportTest.java b/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng7470ResolverTransportTest.java
index 31a38c80dd40..99c2261f06e0 100644
--- a/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng7470ResolverTransportTest.java
+++ b/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng7470ResolverTransportTest.java
@@ -73,7 +73,6 @@ protected void tearDown() throws Exception {
 
     private void performTest(/* nullable */ final String transport, final String logSnippet) throws Exception {
         Verifier verifier = newVerifier(projectDir.getAbsolutePath());
-        verifier.setForkJvm(true);
 
         Map<String, String> properties = new HashMap<>();
         properties.put("@port@", Integer.toString(port));
diff --git a/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng7487DeadlockTest.java b/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng7487DeadlockTest.java
index e7d68fefcfd3..eef383a7d8c1 100644
--- a/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng7487DeadlockTest.java
+++ b/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng7487DeadlockTest.java
@@ -41,8 +41,8 @@ public void testDeadlock() throws IOException, VerificationException {
 
         final File consumerDir = new File(rootDir, "consumer");
         final Verifier consumerVerifier = newVerifier(consumerDir.getAbsolutePath());
-        consumerVerifier.setForkJvm(true);
-        ;
+        consumerVerifier.setForkJvm(true); // TODO: why?
+
         consumerVerifier.addCliArgument("-T2");
         consumerVerifier.addCliArgument("package");
         consumerVerifier.execute();
diff --git a/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng7772CoreExtensionFoundTest.java b/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng7772CoreExtensionFoundTest.java
index aa157f6ad934..3e5dae424587 100644
--- a/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng7772CoreExtensionFoundTest.java
+++ b/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng7772CoreExtensionFoundTest.java
@@ -43,7 +43,6 @@ public void testWithExtensionsXmlCoreExtensionsFound() throws Exception {
 
         verifier = newVerifier(testDir.getAbsolutePath());
         ItUtils.setUserHome(verifier, Paths.get(testDir.toPath().toString(), "home-extensions-xml"));
-        verifier.setForkJvm(true);
 
         verifier.addCliArgument("validate");
         verifier.execute();
@@ -71,7 +70,6 @@ public void testWithLibExtCoreExtensionsFound() throws Exception {
 
             verifier = newVerifier(testDir.getAbsolutePath());
             ItUtils.setUserHome(verifier, Paths.get(testDir.toPath().toString(), "home-lib-ext"));
-            verifier.setForkJvm(true);
             verifier.addCliArgument("validate");
             verifier.execute();
             verifier.verifyTextInLog("[INFO] Extension loaded!");
diff --git a/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng7819FileLockingWithSnapshotsTest.java b/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng7819FileLockingWithSnapshotsTest.java
index 349b2ef580ae..35d4235893e9 100644
--- a/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng7819FileLockingWithSnapshotsTest.java
+++ b/its/core-it-suite/src/test/java/org/apache/maven/it/MavenITmng7819FileLockingWithSnapshotsTest.java
@@ -75,7 +75,6 @@ void testFileLockingAndSnapshots() throws Exception {
         File testDir = extractResources("/mng-7819-file-locking-with-snapshots");
 
         Verifier verifier = newVerifier(testDir.getAbsolutePath());
-        verifier.setForkJvm(true);
 
         // produce required precondition state: local repository must not have any of the org.apache.maven.its.mng7819
         // artifacts