BREAKING CHANGE: Upgrade Spring to 7.x, Spring Boot to 4.x (#2157)

### 📝 Description

NOTE: This PR is built off of #2147, and is a superset of that one. That
one should be merged first.

This pull requests upgrades to the latest Spring Boot and Spring
versions.

For reference, see
https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-4.0-Migration-Guide

The change with the biggest impact is the splitting up of certain
modules within the Spring Boot ecosystem, requiring that we pull more
specific dependencies.

#### Jackson Upgrade Delayed


https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-4.0-Migration-Guide#upgrading-jackson

Spring Boot 4 would prefer that we move to Jackson 3, but we're blocked
on that while graphql-java remains on Jackson 2. Therefore we need to
ensure that we use the Spring Boot Jackson2 module.

**Additionally,** some tests broke when Jackson 3 was included in the
classpath, due to an internal Spring flag that checks the classpath:
https://github.com/spring-projects/spring-framework/blob/77bc13dc8c4387ad33af274eed39ed2734edce56/spring-websocket/src/main/java/org/springframework/web/socket/sockjs/transport/TransportHandlingSockJsService.java#L74

(The above link indicates the kind of logic, I'm not entirely sure it's
the exact spot that was breaking the test).


### 🔗 Related Issues

---------

Co-authored-by: Paul Berkman <paul.berkman@microba.com>
Co-authored-by: Jordan Lopez <jordlopez@expediagroup.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Author: 4 people

.github/workflows/graalvm-integration.yml

@@ -30,7 +30,7 @@ jobs:
       - name: Setup GraalVM
         uses: graalvm/setup-graalvm@v1
         with:
-          java-version: '17'
+          java-version: '25'
           distribution: 'graalvm'
           components: 'native-image'
           native-image-job-reports: 'true'

buildSrc/src/main/kotlin/com.expediagroup.graphql.conventions.gradle.kts

@@ -1,5 +1,5 @@
 import org.gradle.accessors.dm.LibrariesForLibs
-import org.jetbrains.dokka.gradle.DokkaTask
+import org.jetbrains.dokka.gradle.tasks.DokkaGeneratePublicationTask
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 import java.time.Instant
 
@@ -68,11 +68,11 @@ tasks {
         from(sourceSets.main.get().allSource)
     }
 
-    val dokka = named("dokkaJavadoc", DokkaTask::class)
+    val dokka = named<DokkaGeneratePublicationTask>("dokkaGeneratePublicationHtml")
     val javadocJar by registering(Jar::class) {
-        archiveClassifier.set("javadoc")
-        from("${layout.buildDirectory}/dokka/javadoc")
         dependsOn(dokka)
+        archiveClassifier.set("javadoc")
+        from(dokka.flatMap { it.outputDirectory })
     }
     publishing {
         publications {

clients/graphql-kotlin-spring-client/build.gradle.kts

@@ -18,6 +18,16 @@ dependencies {
 
 tasks {
     jacocoTestCoverageVerification {
+        // Exclude synthetic lambda classes inlined from Spring's awaitBody (WebClientExtensions.kt).
+        // Because awaitBody is a `suspend inline` function in Spring 7, the Kotlin compiler inlines
+        // its body (including an anonymous Function2 lambda from the withContext block) directly into
+        // GraphQLWebClient's bytecode. JaCoCo instruments these inlined instructions but cannot find
+        // their source file (it lives in the Spring JAR), causing false coverage misses.
+        classDirectories.setFrom(
+            sourceSets.main.get().output.asFileTree.matching {
+                exclude("**/GraphQLWebClient\$execute\$suspendImpl\$\$inlined\$awaitBody\$*")
+            }
+        )
         violationRules {
             rule {
                 limit {

examples/federation/products-subgraph/build.gradle.kts

@@ -10,6 +10,7 @@ plugins {
 dependencies {
     implementation("com.expediagroup", "graphql-kotlin-spring-server")
     testImplementation(libs.spring.boot.test)
+    testImplementation(libs.spring.boot.webtestclient)
 
     graphqlSDL("com.expediagroup", "graphql-kotlin-federated-hooks-provider")
 }

examples/federation/products-subgraph/src/test/kotlin/com/expediagroup/graphql/examples/federation/products/ProductsApplicationTest.kt

@@ -17,16 +17,23 @@
 package com.expediagroup.graphql.examples.federation.products
 
 import com.expediagroup.graphql.server.types.GraphQLRequest
+import org.junit.jupiter.api.BeforeEach
 import org.junit.jupiter.api.Test
 import org.springframework.beans.factory.annotation.Autowired
-import org.springframework.boot.test.autoconfigure.web.reactive.AutoConfigureWebTestClient
 import org.springframework.boot.test.context.SpringBootTest
+import org.springframework.context.ApplicationContext
 import org.springframework.http.MediaType
 import org.springframework.test.web.reactive.server.WebTestClient
 
 @SpringBootTest
-@AutoConfigureWebTestClient
-class ProductsApplicationTest(@Autowired val testClient: WebTestClient) {
+class ProductsApplicationTest {
+
+    private lateinit var testClient: WebTestClient
+
+    @BeforeEach
+    fun setup(@Autowired context: ApplicationContext) {
+        testClient = WebTestClient.bindToApplicationContext(context).build()
+    }
 
     @Test
     fun `verifies product query`() {

examples/federation/reviews-subgraph/build.gradle.kts

@@ -10,6 +10,7 @@ plugins {
 dependencies {
     implementation("com.expediagroup", "graphql-kotlin-spring-server")
     testImplementation(libs.spring.boot.test)
+    testImplementation(libs.spring.boot.webtestclient)
 
     graphqlSDL("com.expediagroup", "graphql-kotlin-federated-hooks-provider")
 }

examples/federation/reviews-subgraph/src/test/kotlin/com/expediagroup/graphql/examples/federation/reviews/ReviewsApplicationTest.kt

@@ -17,16 +17,23 @@
 package com.expediagroup.graphql.examples.federation.reviews
 
 import com.expediagroup.graphql.server.types.GraphQLRequest
+import org.junit.jupiter.api.BeforeEach
 import org.junit.jupiter.api.Test
 import org.springframework.beans.factory.annotation.Autowired
-import org.springframework.boot.test.autoconfigure.web.reactive.AutoConfigureWebTestClient
 import org.springframework.boot.test.context.SpringBootTest
+import org.springframework.context.ApplicationContext
 import org.springframework.http.MediaType
 import org.springframework.test.web.reactive.server.WebTestClient
 
 @SpringBootTest
-@AutoConfigureWebTestClient
-class ReviewsApplicationTest(@Autowired val testClient: WebTestClient) {
+class ReviewsApplicationTest {
+
+    private lateinit var testClient: WebTestClient
+
+    @BeforeEach
+    fun setup(@Autowired context: ApplicationContext) {
+        testClient = WebTestClient.bindToApplicationContext(context).build()
+    }
 
     @Test
     fun `verifies product query`() {

examples/server/spring-server/build.gradle.kts

@@ -12,6 +12,7 @@ dependencies {
     implementation("com.expediagroup", "graphql-kotlin-hooks-provider")
     implementation(libs.spring.boot.validation)
     testImplementation(libs.spring.boot.test)
+    testImplementation(libs.spring.boot.webtestclient)
     testImplementation(libs.reactor.test)
 }
 

examples/server/spring-server/src/test/kotlin/com/expediagroup/graphql/examples/server/spring/mutation/ScalarMutationIT.kt

@@ -20,19 +20,26 @@ import com.expediagroup.graphql.examples.server.spring.DATA_JSON_PATH
 import com.expediagroup.graphql.examples.server.spring.GRAPHQL_ENDPOINT
 import com.expediagroup.graphql.examples.server.spring.GRAPHQL_MEDIA_TYPE
 import com.expediagroup.graphql.examples.server.spring.verifyOnlyDataExists
+import org.junit.jupiter.api.BeforeEach
 import org.junit.jupiter.api.Test
 import org.junit.jupiter.api.TestInstance
 import org.junit.jupiter.api.TestInstance.Lifecycle.PER_CLASS
 import org.springframework.beans.factory.annotation.Autowired
-import org.springframework.boot.test.autoconfigure.web.reactive.AutoConfigureWebTestClient
 import org.springframework.boot.test.context.SpringBootTest
+import org.springframework.context.ApplicationContext
 import org.springframework.http.MediaType.APPLICATION_JSON
 import org.springframework.test.web.reactive.server.WebTestClient
 
 @SpringBootTest
-@AutoConfigureWebTestClient
 @TestInstance(PER_CLASS)
-class ScalarMutationIT(@Autowired private val testClient: WebTestClient) {
+class ScalarMutationIT {
+
+    private lateinit var testClient: WebTestClient
+
+    @BeforeEach
+    fun setup(@Autowired context: ApplicationContext) {
+        testClient = WebTestClient.bindToApplicationContext(context).build()
+    }
 
     @Test
     fun `verify addPerson query`() {

examples/server/spring-server/src/test/kotlin/com/expediagroup/graphql/examples/server/spring/mutation/SimpleMutationIT.kt

@@ -21,19 +21,26 @@ import com.expediagroup.graphql.examples.server.spring.GRAPHQL_ENDPOINT
 import com.expediagroup.graphql.examples.server.spring.GRAPHQL_MEDIA_TYPE
 import com.expediagroup.graphql.examples.server.spring.verifyOnlyDataExists
 import org.hamcrest.Matchers
+import org.junit.jupiter.api.BeforeEach
 import org.junit.jupiter.api.Test
 import org.junit.jupiter.api.TestInstance
 import org.junit.jupiter.api.TestInstance.Lifecycle.PER_CLASS
 import org.springframework.beans.factory.annotation.Autowired
-import org.springframework.boot.test.autoconfigure.web.reactive.AutoConfigureWebTestClient
 import org.springframework.boot.test.context.SpringBootTest
+import org.springframework.context.ApplicationContext
 import org.springframework.http.MediaType.APPLICATION_JSON
 import org.springframework.test.web.reactive.server.WebTestClient
 
 @SpringBootTest
-@AutoConfigureWebTestClient
 @TestInstance(PER_CLASS)
-class SimpleMutationIT(@Autowired private val testClient: WebTestClient) {
+class SimpleMutationIT {
+
+    private lateinit var testClient: WebTestClient
+
+    @BeforeEach
+    fun setup(@Autowired context: ApplicationContext) {
+        testClient = WebTestClient.bindToApplicationContext(context).build()
+    }
 
     @Test
     fun `verify addToList query`() {