I finally figured out how to get dependency management working in multi-module

build.gradle.kts

@@ -9,7 +9,7 @@ plugins {
 
     // Spring
     kotlin("plugin.spring")
-    id("org.springframework.boot") apply false
+    id("org.springframework.boot")
     id("io.spring.dependency-management")
 
     //Tooling
@@ -36,24 +36,15 @@ allprojects {
     apply(plugin = "io.spring.dependency-management")
 
     // Versions --- found in gradle.properties
-    val kotlinVersion: String by properties
-    // Tool
-    val kotlinxCoroutinesReactorVersion: String by properties
-    val reactorKotlinExtensions: String by properties
     // Discord
     val discord4jVersion: String by properties
     val discord4jStoresVersion: String by properties
     val discordWebhookVersion: String by properties
-    // Spring
-    val springVersion: String by properties
-    // Database
-    val flywayVersion: String by properties
+    // Database\
     val mikuR2dbcMySqlVersion: String by properties
     val mySqlConnectorJava: String by properties
     // Serialization
     val kotlinxSerializationJsonVersion: String by properties
-    val jacksonVersion: String by properties
-    val jsonVersion: String by properties
     // Observability
     val logbackContribVersion: String by properties
     // Google libs
@@ -61,7 +52,6 @@ allprojects {
     val googleServicesCalendarVersion: String by properties
     val googleOauthClientVersion: String by properties
     // Various libs
-    val okhttpVersion: String by properties
     val copyDownVersion: String by properties
     val jsoupVersion: String by properties
 
@@ -78,10 +68,10 @@ allprojects {
 
     dependencies {
         // Tools
-        implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlinVersion")
-        implementation("org.jetbrains.kotlin:kotlin-reflect:$kotlinVersion")
-        implementation("org.jetbrains.kotlinx:kotlinx-coroutines-reactor:$kotlinxCoroutinesReactorVersion")
-        implementation("io.projectreactor.kotlin:reactor-kotlin-extensions:$reactorKotlinExtensions")
+        implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
+        implementation("org.jetbrains.kotlin:kotlin-reflect")
+        implementation("org.jetbrains.kotlinx:kotlinx-coroutines-reactor")
+        implementation("io.projectreactor.kotlin:reactor-kotlin-extensions")
 
         // Discord
         implementation("com.discord4j:discord4j-core:$discord4jVersion")
@@ -89,11 +79,11 @@ allprojects {
         implementation("club.minnced:discord-webhooks:$discordWebhookVersion")
 
         // Spring
-        implementation("org.springframework.boot:spring-boot-starter-data-jdbc:$springVersion")
-        implementation("org.springframework.boot:spring-boot-starter-data-r2dbc:$springVersion")
-        implementation("org.springframework.boot:spring-boot-starter-data-redis:$springVersion")
-        implementation("org.springframework.boot:spring-boot-starter-webflux:$springVersion")
-        implementation("org.springframework.boot:spring-boot-starter-cache:$springVersion")
+        implementation("org.springframework.boot:spring-boot-starter-data-jdbc")
+        implementation("org.springframework.boot:spring-boot-starter-data-r2dbc")
+        implementation("org.springframework.boot:spring-boot-starter-data-redis")
+        implementation("org.springframework.boot:spring-boot-starter-webflux")
+        implementation("org.springframework.boot:spring-boot-starter-cache")
 
         // Database
         implementation("dev.miku:r2dbc-mysql:$mikuR2dbcMySqlVersion")
@@ -101,9 +91,9 @@ allprojects {
 
         // Serialization
         implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:$kotlinxSerializationJsonVersion")
-        implementation("com.fasterxml.jackson.module:jackson-module-kotlin:$jacksonVersion")
-        implementation("com.fasterxml.jackson.datatype:jackson-datatype-jsr310:$jacksonVersion")
-        implementation("org.json:json:$jsonVersion")
+        implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
+        implementation("com.fasterxml.jackson.datatype:jackson-datatype-jsr310")
+        implementation("org.json:json")
 
         // Observability
         implementation("ch.qos.logback.contrib:logback-json-classic:$logbackContribVersion")
@@ -117,7 +107,7 @@ allprojects {
         }
 
         // Various Libs
-        implementation("com.squareup.okhttp3:okhttp:$okhttpVersion")
+        implementation("com.squareup.okhttp3:okhttp")
         implementation("io.github.furstenheim:copy_down:$copyDownVersion")
         implementation("org.jsoup:jsoup:$jsoupVersion")
     }

core/build.gradle.kts

@@ -12,6 +12,7 @@ plugins {
 
     // Spring
     kotlin("plugin.spring")
+    id("org.springframework.boot")
     id("io.spring.dependency-management")
 
     // Tooling

gradle.properties

@@ -1,5 +1,3 @@
-# TODO: I eventually want to get spring's dependency management (BOM) plugin working one day, but its not resolving versions somehow?
-
 # Language
 kotlinVersion=1.9.10
 
@@ -11,10 +9,6 @@ gitPropertiesVersion=2.4.1
 # Buildscript tooling
 kotlinPoetVersion=1.14.2
 
-# Tools
-kotlinxCoroutinesReactorVersion=1.7.3
-reactorKotlinExtensions=1.2.2
-
 # Discord
 discord4jVersion=3.2.6
 discord4jStoresVersion=3.2.2
@@ -24,14 +18,11 @@ discordWebhookVersion=0.8.4
 springVersion=3.1.3
 
 # Database
-flywayVersion=9.3.0
 mikuR2dbcMySqlVersion=0.8.2.RELEASE
 mySqlConnectorJava=8.0.33
 
 # Serialization
 kotlinxSerializationJsonVersion=1.6.0
-jacksonVersion=2.15.2
-jsonVersion=20230618
 
 # Observability
 logbackContribVersion=0.1.5

server/build.gradle.kts

@@ -11,16 +11,12 @@ plugins {
     id("com.google.cloud.tools.jib")
 }
 
-// Versions --- found in gradle.properties
-// Database
-val flywayVersion: String by properties
-
 dependencies {
     api(project(":core"))
 
     // Database
-    implementation("org.flywaydb:flyway-core:$flywayVersion")
-    implementation("org.flywaydb:flyway-mysql:$flywayVersion")
+    implementation("org.flywaydb:flyway-core")
+    implementation("org.flywaydb:flyway-mysql")
 }
 
 kotlin {

settings.gradle.kts

@@ -18,7 +18,7 @@ pluginManagement {
         // Spring
         kotlin("plugin.spring") version kotlinVersion
         id("io.spring.dependency-management") version springDependencyManagementVersion
-        id("org.springframework.boot") version springVersion apply false
+        id("org.springframework.boot") version springVersion
 
         // Tooling
         id("com.gorylenko.gradle-git-properties") version gitPropertiesVersion apply false