Compatibility with Gradle 9 (#6308)

Author: martinbonnin

libraries/apollo-gradle-plugin-external/src/main/kotlin/com/apollographql/apollo/gradle/internal/DefaultApolloExtension.kt

@@ -58,7 +58,7 @@ abstract class DefaultApolloExtension(
         schemaFiles = service.schemaFilesSnapshot(project),
         graphqlSrcDirs = service.graphqlSourceDirectorySet.srcDirs,
         upstreamProjects = service.upstreamDependencies.filterIsInstance<ProjectDependency>().map { it.name }.toSet(),
-        upstreamProjectPaths = service.upstreamDependencies.filterIsInstance<ProjectDependency>().map { it.dependencyProject.path }.toSet(),
+        upstreamProjectPaths = service.upstreamDependencies.filterIsInstance<ProjectDependency>().map { it.getPathCompat() }.toSet(),
         endpointUrl = service.introspection?.endpointUrl?.orNull,
         endpointHeaders = service.introspection?.headers?.orNull,
         useSemanticNaming = service.useSemanticNaming.getOrElse(true),
@@ -239,7 +239,7 @@ abstract class DefaultApolloExtension(
     check(apolloMetadataConfiguration.dependencies.isEmpty()) {
       val projectLines = apolloMetadataConfiguration.dependencies.map {
         when (it) {
-          is ProjectDependency -> "project(\"${it.dependencyProject.path}\")"
+          is ProjectDependency -> "project(\"${it.getPathCompat()}\")"
           is ExternalModuleDependency -> "\"group:artifact:version\""
           else -> "project(\":foo\")"
 

libraries/apollo-gradle-plugin-external/src/main/kotlin/com/apollographql/apollo/gradle/internal/DefaultService.kt

@@ -198,7 +198,7 @@ abstract class DefaultService @Inject constructor(val project: Project, override
     upstreamDependencies.add(project.dependencies.create(dependencyNotation))
     if (bidirectional) {
       val upstreamProject = when (dependencyNotation) {
-        is ProjectDependency -> project.rootProject.project(dependencyNotation.dependencyProject.path)
+        is ProjectDependency -> project.rootProject.project(dependencyNotation.getPathCompat())
         is Project -> dependencyNotation
         else -> error("dependsOn(dependencyNotation, true) requires a Project or ProjectDependency")
       }

libraries/apollo-gradle-plugin-external/src/main/kotlin/com/apollographql/apollo/gradle/internal/utils.kt

@@ -1,6 +1,7 @@
 package com.apollographql.apollo.gradle.internal
 
 import com.apollographql.apollo.compiler.InputFile
+import org.gradle.api.artifacts.ProjectDependency
 import org.gradle.api.file.FileCollection
 import java.io.File
 
@@ -24,3 +25,15 @@ internal fun FileCollection.toInputFiles(): List<InputFile> {
  */
 internal fun FileCollection.isolate(): List<Any> = toInputFiles().isolate()
 internal fun List<InputFile>.isolate(): List<Any> = flatMap { listOf(it.normalizedPath, it.file) }
+
+
+internal fun ProjectDependency.getPathCompat(): String {
+  val method = this::class.java.getDeclaredMethod("getPath")
+  return if (method != null) {
+    // Gradle 8.11+ path
+    // See https://docs.gradle.org/8.11/userguide/upgrading_version_8.html#deprecate_get_dependency_project
+    method.invoke(this) as String
+  } else {
+    dependencyProject.path
+  }
+}