diff --git a/README.md b/README.md
index ce8d0b2..a81fc1a 100644
--- a/README.md
+++ b/README.md
@@ -54,7 +54,7 @@ See the README in [consuming-a-maven-bom/](consuming-a-maven-bom/).
 
 ### `multi-module/`
 
-This subproject illustrates a multi-module Gradle project.
+A **poorly configured** multi-module Gradle project.
 
 See the README in [multi-module/](multi-module/).
 
diff --git a/multi-module/README.md b/multi-module/README.md
index 917be85..7b605a3 100644
--- a/multi-module/README.md
+++ b/multi-module/README.md
@@ -1,6 +1,6 @@
 # multi-module
 
-This subproject illustrates a multi-module Gradle project.
+A **poorly configured** multi-module Gradle project.
 
 
 ## Overview
@@ -8,13 +8,18 @@ This subproject illustrates a multi-module Gradle project.
 This project is me learning how to configure multi-module Gradle projects. Read more about Gradle's support for
 multi-project builds at the [official doc site](https://docs.gradle.org/current/userguide/kotlin_dsl.html#sec:multi_project_builds).
 
+This project is a poor configuration of a multi-module Gradle project because it uses "cross-configuring" from the root
+`build.gradle.kts` file. This is not recommend. See the extensive note in that file. Instead, you should use a
+combination of pre-compiled script plugins and keeping subproject-specific configuration in the subproject instead of
+trying to "control it from afar" in the root `build.gradle.kts`.
+
 
 ## Instructions
 
 The interesting part of this project is the Gradle configuration. So, read the `build.gradle.kts` files. But still, it's
 useful to execute the example applications to prove that it works. Follow the below steps to build and run the programs:
 
-1. Use Java 17
+1. Pre-requisite: Java 21
 2. Run `module-a`:
    * ```shell
      ./gradlew :module-a:run
@@ -22,7 +27,7 @@ useful to execute the example applications to prove that it works. Follow the be
    * It should print something like the following.
    * ```text
      > Task :module-a:run
-     [main] INFO dgroomes.MainA - Hello world from 'module-a'!
+     [main] INFO dgroomes.multi_module.module_a.MainA - Hello world from 'module-a'!
      ```
 3. Run `module-b`:
    * ```shell
@@ -31,7 +36,7 @@ useful to execute the example applications to prove that it works. Follow the be
    * It should print something like the following.
    * ```text
      > Task :module-b:run
-     [main] INFO dgroomes.MainB - Hello world from 'module-b'!
+     [main] INFO dgroomes.multi_module.module_b.MainB - Hello world from 'module-b'!
      ```
 
 
diff --git a/multi-module/build.gradle.kts b/multi-module/build.gradle.kts
index 9652aac..d52b81a 100644
--- a/multi-module/build.gradle.kts
+++ b/multi-module/build.gradle.kts
@@ -41,7 +41,7 @@ subprojects {
  */
 val moduleA = project(":module-a") {
     configure<JavaApplication> {
-        mainClass.set("dgroomes.MainA")
+        mainClass.set("dgroomes.multi_module.module_a.MainA")
     }
 }
 
diff --git a/multi-module/gradle/wrapper/gradle-wrapper.jar b/multi-module/gradle/wrapper/gradle-wrapper.jar
index 249e583..033e24c 100644
Binary files a/multi-module/gradle/wrapper/gradle-wrapper.jar and b/multi-module/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/multi-module/gradle/wrapper/gradle-wrapper.properties b/multi-module/gradle/wrapper/gradle-wrapper.properties
index 84a0b92..09523c0 100644
--- a/multi-module/gradle/wrapper/gradle-wrapper.properties
+++ b/multi-module/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,7 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.2.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.9-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/multi-module/gradlew b/multi-module/gradlew
index a69d9cb..fcb6fca 100755
--- a/multi-module/gradlew
+++ b/multi-module/gradlew
@@ -55,7 +55,7 @@
 #       Darwin, MinGW, and NonStop.
 #
 #   (3) This script is generated from the Groovy template
-#       https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       https://github.com/gradle/gradle/blob/HEAD/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
 #       within the Gradle project.
 #
 #       You can find Gradle at https://github.com/gradle/gradle/.
@@ -80,13 +80,10 @@ do
     esac
 done
 
-APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
-
-APP_NAME="Gradle"
+# This is normally unused
+# shellcheck disable=SC2034
 APP_BASE_NAME=${0##*/}
-
-# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
 
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD=maximum
@@ -133,22 +130,29 @@ location of your Java installation."
     fi
 else
     JAVACMD=java
-    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
 
 Please set the JAVA_HOME variable in your environment to match the
 location of your Java installation."
+    fi
 fi
 
 # Increase the maximum file descriptors if we can.
 if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
     case $MAX_FD in #(
       max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC3045
         MAX_FD=$( ulimit -H -n ) ||
             warn "Could not query maximum file descriptor limit"
     esac
     case $MAX_FD in  #(
       '' | soft) :;; #(
       *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC3045
         ulimit -n "$MAX_FD" ||
             warn "Could not set maximum file descriptor limit to $MAX_FD"
     esac
@@ -193,6 +197,10 @@ if "$cygwin" || "$msys" ; then
     done
 fi
 
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
 # Collect all arguments for the java command;
 #   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
 #     shell script including quotes and variable substitutions, so put them in
diff --git a/multi-module/gradlew.bat b/multi-module/gradlew.bat
index f127cfd..93e3f59 100644
--- a/multi-module/gradlew.bat
+++ b/multi-module/gradlew.bat
@@ -26,6 +26,7 @@ if "%OS%"=="Windows_NT" setlocal
 
 set DIRNAME=%~dp0
 if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
 set APP_BASE_NAME=%~n0
 set APP_HOME=%DIRNAME%
 
diff --git a/multi-module/module-a/src/main/java/dgroomes/MainA.java b/multi-module/module-a/src/main/java/dgroomes/multi_module/module_a/MainA.java
similarity index 86%
rename from multi-module/module-a/src/main/java/dgroomes/MainA.java
rename to multi-module/module-a/src/main/java/dgroomes/multi_module/module_a/MainA.java
index d424d6c..e79c60a 100644
--- a/multi-module/module-a/src/main/java/dgroomes/MainA.java
+++ b/multi-module/module-a/src/main/java/dgroomes/multi_module/module_a/MainA.java
@@ -1,4 +1,4 @@
-package dgroomes;
+package dgroomes.multi_module.module_a;
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
diff --git a/multi-module/module-b/build.gradle.kts b/multi-module/module-b/build.gradle.kts
index 042c537..d7c2843 100644
--- a/multi-module/module-b/build.gradle.kts
+++ b/multi-module/module-b/build.gradle.kts
@@ -1,3 +1,3 @@
 application {
-    mainClass.set("dgroomes.MainB")
+    mainClass.set("dgroomes.multi_module.module_b.MainB")
 }
diff --git a/multi-module/module-b/src/main/java/dgroomes/MainB.java b/multi-module/module-b/src/main/java/dgroomes/multi_module/module_b/MainB.java
similarity index 86%
rename from multi-module/module-b/src/main/java/dgroomes/MainB.java
rename to multi-module/module-b/src/main/java/dgroomes/multi_module/module_b/MainB.java
index 6b31dc4..db16030 100644
--- a/multi-module/module-b/src/main/java/dgroomes/MainB.java
+++ b/multi-module/module-b/src/main/java/dgroomes/multi_module/module_b/MainB.java
@@ -1,4 +1,4 @@
-package dgroomes;
+package dgroomes.multi_module.module_b;
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;