Add Convention Plugins for Spring Boot (Kotlin variant)

jjohannes · jjohannes · commit 7ad842843698 · 2025-07-24T07:47:06.000+02:00
diff --git a/app/build.gradle.kts b/app/build.gradle.kts
@@ -1,7 +1,5 @@
 plugins { id("org.example.gradle.component.application") }
 
-application { mainClass = "org.example.product.app.Application" }
-
 dependencies {
     implementation(projects.bespin)
     implementation(projects.corellia)
@@ -13,8 +11,12 @@ dependencies {
     implementation(libs.guice.servlet)
     implementation(libs.kotlin.stdlib)
     implementation(libs.slf4j.api)
+    implementation(libs.spring.boot)
+    implementation(libs.spring.boot.autoconfigure)
+    implementation(libs.spring.context)
+    implementation(libs.spring.web)
     runtimeOnly(libs.slf4j.simple)
-    providedCompile(libs.jakarta.servlet.api)
+    runtimeOnly(libs.spring.boot.starter.web)
 
     mockApiApi(libs.guava)
     mockApiImplementation(projects.app)
diff --git a/app/src/main/kotlin/org/example/product/app/AppServlet.kt b/app/src/main/kotlin/org/example/product/app/AppServlet.kt
@@ -1,19 +1,26 @@
 package org.example.product.app
 
-import javax.servlet.annotation.WebServlet
-import javax.servlet.http.HttpServlet
-import javax.servlet.http.HttpServletRequest
-import javax.servlet.http.HttpServletResponse
+import java.io.BufferedReader
+import java.io.InputStreamReader
+import java.util.*
+import org.springframework.web.bind.annotation.GetMapping
+import org.springframework.web.bind.annotation.RestController
 
-@WebServlet("/check")
-class AppServlet : HttpServlet() {
+@RestController
+class AppServlet {
 
-    public override fun doGet(req: HttpServletRequest, res: HttpServletResponse) {
-        res.contentType = "text/html"
-        val pw = res.writer
-        pw.println("<html><body>")
-        pw.println("App is running...")
-        pw.println("</body></html>")
-        pw.close()
+    @GetMapping("/")
+    fun index(): String {
+        MainModule().run()
+        val version =
+            BufferedReader(
+                    InputStreamReader(
+                        Objects.requireNonNull(
+                            AppServlet::class.java.getResourceAsStream("/version.txt")
+                        )
+                    )
+                )
+                .readLine()
+        return "<html><body>App is running... !!!!<br/>Version $version</body></html>"
     }
 }
diff --git a/app/src/main/kotlin/org/example/product/app/Application.kt b/app/src/main/kotlin/org/example/product/app/Application.kt
@@ -1,5 +1,10 @@
 package org.example.product.app
 
+import org.springframework.boot.SpringApplication
+import org.springframework.boot.autoconfigure.SpringBootApplication
+
 fun main(args: Array<String>) {
-    MainModule().run()
+    SpringApplication.run(Application::class.java, *args)
 }
+
+@SpringBootApplication open class Application
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
@@ -16,7 +16,8 @@ org-reflections = "0.9.11"
 poi = "5.4.0"
 resteasy = "4.7.6.Final"
 slf4j = "1.7.36"
-solrj = "7.7.3"
+solrj = "7.7.3!!" # strict version, to downgrade the version Spring brings in
+spring-boot = "3.5.3"
 typesafeconfig = "0.1.0"
 velocity = "2.4.1"
 zookeeper = "3.9.3"
@@ -52,6 +53,12 @@ resteasy-jackson2-provider = { module = "org.jboss.resteasy:resteasy-jackson2-pr
 slf4j-api = { module = "org.slf4j:slf4j-api", version.ref = "slf4j" }
 slf4j-simple = { module = "org.slf4j:slf4j-simple", version.ref = "slf4j" }
 solr-solrj = { module = "org.apache.solr:solr-solrj", version.ref = "solrj" }
+spring-boot = { module = "org.springframework.boot:spring-boot" }
+spring-boot-autoconfigure = { module = "org.springframework.boot:spring-boot-autoconfigure" }
+spring-boot-dependencies = { module = "org.springframework.boot:spring-boot-dependencies", version.ref = "spring-boot" }
+spring-boot-starter-web = { module = "org.springframework.boot:spring-boot-starter-web" }
+spring-context = { module = "org.springframework:spring-context" }
+spring-web = { module = "org.springframework:spring-web" }
 typesafeconfig-guice = { module = "com.github.racc:typesafeconfig-guice", version.ref = "typesafeconfig" }
 velocity-engine-core = { module = "org.apache.velocity:velocity-engine-core", version.ref = "velocity" }
 zookeeper = { module = "org.apache.zookeeper:zookeeper", version.ref = "zookeeper" }
diff --git a/gradle/plugins/build.gradle.kts b/gradle/plugins/build.gradle.kts
@@ -10,6 +10,7 @@ dependencies {
     implementation("org.cyclonedx:cyclonedx-gradle-plugin:2.3.1")
     implementation("org.gradlex:jvm-dependency-conflict-resolution:2.4")
     implementation("org.jetbrains.kotlin:kotlin-gradle-plugin:2.2.0")
+    implementation("org.springframework.boot:spring-boot-gradle-plugin:3.5.3")
 }
 
 testing.suites.named<JvmTestSuite>("test") {
diff --git a/gradle/plugins/src/main/kotlin/org.example.gradle.base.identity.gradle.kts b/gradle/plugins/src/main/kotlin/org.example.gradle.base.identity.gradle.kts
@@ -2,7 +2,7 @@ plugins { id("org.gradle.base") }
 
 // Set the group required to refer to a Module "from outside".
 // I.e., when it is published or used in Included Builds.
-group = "org.example.product.java"
+group = "org.example.product.springkt"
 
 // Set the version from 'version.txt'
 version = providers.fileContents(isolated.rootProject.projectDirectory.file("gradle/version.txt")).asText.getOrElse("")
diff --git a/gradle/plugins/src/main/kotlin/org.example.gradle.component.application.gradle.kts b/gradle/plugins/src/main/kotlin/org.example.gradle.component.application.gradle.kts
@@ -1,17 +1,18 @@
 plugins {
-    id("org.gradle.application")
+    id("org.gradle.java")
     id("org.example.gradle.base.dependency-rules")
     id("org.example.gradle.base.identity")
     id("org.example.gradle.base.lifecycle")
     id("org.example.gradle.check.dependencies")
     id("org.example.gradle.check.format-gradle")
     id("org.example.gradle.check.format-java")
     id("org.example.gradle.check.format-kotlin")
+    id("org.example.gradle.feature.spring-boot")
     id("org.example.gradle.feature.checksum")
+    id("org.example.gradle.feature.package-version-txt")
     id("org.example.gradle.feature.compile-java")
     id("org.example.gradle.feature.compile-kotlin")
     id("org.example.gradle.feature.javadoc")
     id("org.example.gradle.feature.test")
     id("org.example.gradle.feature.test-end-to-end")
-    id("org.example.gradle.feature.war")
 }
diff --git a/gradle/plugins/src/main/kotlin/org.example.gradle.feature.package-version-txt.gradle.kts b/gradle/plugins/src/main/kotlin/org.example.gradle.feature.package-version-txt.gradle.kts
@@ -0,0 +1,3 @@
+plugins { id("org.gradle.java") }
+
+tasks.processResources { from(isolated.rootProject.projectDirectory.file("gradle/version.txt")) }
diff --git a/gradle/plugins/src/main/kotlin/org.example.gradle.feature.spring-boot.gradle.kts b/gradle/plugins/src/main/kotlin/org.example.gradle.feature.spring-boot.gradle.kts
@@ -0,0 +1,18 @@
+plugins {
+    id("org.gradle.java")
+    id("org.springframework.boot")
+    id("org.example.gradle.base.dependency-rules")
+}
+
+dependencies { developmentOnly("org.springframework.boot:spring-boot-devtools") }
+
+configurations {
+    productionRuntimeClasspath {
+        extendsFrom(configurations["internal"])
+        shouldResolveConsistentlyWith(configurations["mainRuntimeClasspath"])
+    }
+    developmentOnly {
+        extendsFrom(configurations["internal"])
+        shouldResolveConsistentlyWith(configurations["mainRuntimeClasspath"])
+    }
+}
diff --git a/gradle/plugins/src/main/kotlin/org.example.gradle.feature.war.gradle.kts b/gradle/plugins/src/main/kotlin/org.example.gradle.feature.war.gradle.kts
diff --git a/gradle/versions/build.gradle.kts b/gradle/versions/build.gradle.kts
@@ -5,6 +5,10 @@ plugins {
     id("org.example.gradle.check.format-gradle")
 }
 
+javaPlatform.allowDependencies()
+
+dependencies { api(platform(libs.spring.boot.dependencies)) }
+
 // Reject versions that should not be upgraded beyond a certain point.
 // This makes Dependabot PR builds fail that attempt to update these.
 dependencies.constraints {
diff --git a/kamino/build.gradle.kts b/kamino/build.gradle.kts
@@ -6,9 +6,6 @@ plugins {
 dependencies {
     api(projects.coruscant)
     api(libs.kotlin.stdlib)
-    api(libs.resteasy.core)
-    implementation(libs.resteasy.guice)
-    implementation(libs.resteasy.jackson2.provider)
 
     testImplementation(libs.junit.jupiter.api)
 }
diff --git a/kamino/src/main/kotlin/org/example/product/kamino/KaminoModule.kt b/kamino/src/main/kotlin/org/example/product/kamino/KaminoModule.kt
@@ -1,14 +1,9 @@
 package org.example.product.kamino
 
 import org.example.product.coruscant.CoruscantModuleData
-import org.jboss.resteasy.plugins.guice.GuiceResteasyBootstrapServletContextListener
-import org.jboss.resteasy.plugins.providers.jackson.ResteasyJackson2Provider
-import org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap
 
 /** I am published and therefore I have Javadoc! */
 class KaminoModule {
-    /** Bootstrap... */
-    var bootstrap: ResteasyBootstrap? = null
 
     /** Data... */
     var data: CoruscantModuleData? = null
@@ -19,10 +14,6 @@ class KaminoModule {
      * @return all the important Classes
      */
     fun info(): Array<Class<*>> {
-        return arrayOf(
-            ResteasyBootstrap::class.java,
-            ResteasyJackson2Provider::class.java,
-            GuiceResteasyBootstrapServletContextListener::class.java
-        )
+        return arrayOf()
     }
 }

Original file line number	Diff line number	Diff line change
`@@ -10,6 +10,7 @@ dependencies {`
`10`	`10`	`implementation("org.cyclonedx:cyclonedx-gradle-plugin:2.3.1")`
`11`	`11`	`implementation("org.gradlex:jvm-dependency-conflict-resolution:2.4")`
`12`	`12`	`implementation("org.jetbrains.kotlin:kotlin-gradle-plugin:2.2.0")`
	`13`	`+ implementation("org.springframework.boot:spring-boot-gradle-plugin:3.5.3")`
`13`	`14`	`}`
`14`	`15`
`15`	`16`	`testing.suites.named<JvmTestSuite>("test") {`
Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,3 @@`
	`1`	`+plugins { id("org.gradle.java") }`
	`2`	`+`
	`3`	`+tasks.processResources { from(isolated.rootProject.projectDirectory.file("gradle/version.txt")) }`