Optimize Dokka to process selected modules only

- Refactor Dokka configuration to apply only to modules with Kotlin
  sources, reducing build overhead and improving performance for
  modules without Kotlin code.
- Remove deprecated commands

Author: cppwfs

build.gradle

@@ -115,6 +115,11 @@ ext {
     ztZipVersion = '1.17'
 
     javaProjects = subprojects - project(':spring-integration-bom')
+
+    // Modules that have Kotlin sources to document using dokka
+    dokkaProjects = [
+            'spring-integration-core'
+    ]
 }
 
 allprojects {
@@ -188,8 +193,6 @@ configure(javaProjects) { subproject ->
     apply plugin: 'kotlin'
     apply plugin: 'kotlin-spring'
     apply plugin: 'io.spring.nullability'
-    apply plugin: 'org.jetbrains.dokka'
-
 
     apply from: "${rootDir}/gradle/publish-maven.gradle"
 
@@ -395,7 +398,25 @@ configure(javaProjects) { subproject ->
 
     check.dependsOn checkClasspathForConflicts, javadoc
 
+    publishing {
+        publications {
+            mavenJava(MavenPublication) {
+                suppressAllPomMetadataWarnings()
+                from components.java
+                pom.withXml {
+                    def pomDeps = asNode().dependencies.first()
+                    subproject.configurations.provided.allDependencies.each { dep ->
+                     pomDeps.'*'.find { it.artifactId.text() == dep.name }.scope.first().value = 'provided'
+                    }
+                }
+            }
+        }
+    }
+}
 
+// Process only the modules that require kotlin docs
+configure(subprojects.findAll { dokkaProjects.contains(it.name) }) { subproject ->
+    apply plugin: 'org.jetbrains.dokka'
     dokka {
         dokkaPublications.html {
             outputDirectory.set(file(rootProject.layout.buildDirectory.file('kdoc')))
@@ -405,31 +426,16 @@ configure(javaProjects) { subproject ->
             classpath.from(sourceSets['main'].runtimeClasspath)
             externalDocumentationLinks.register("spring-integration-api") {
                 url.set(uri("https://docs.spring.io/spring-integration/docs/$version/api/"))
-                packageListUrl.set(file('build/docs/javadoc/element-list').toURI())
+                packageListUrl.set(file(rootProject.layout.buildDirectory.file('docs/javadoc/element-list')).toURI())
             }
             externalDocumentationLinks.register("reactor-core") {
                 url.set(uri('https://projectreactor.io/docs/core/release/api/'))
             }
-            externalDocumentationLinks.register("reactor-streams") {
+            externalDocumentationLinks.register("reactive-streams") {
                 url.set(uri('https://www.reactive-streams.org/reactive-streams-1.0.3-javadoc/'))
             }
         }
     }
-
-    publishing {
-        publications {
-            mavenJava(MavenPublication) {
-                suppressAllPomMetadataWarnings()
-                from components.java
-                pom.withXml {
-                    def pomDeps = asNode().dependencies.first()
-                    subproject.configurations.provided.allDependencies.each { dep ->
-                     pomDeps.'*'.find { it.artifactId.text() == dep.name }.scope.first().value = 'provided'
-                    }
-                }
-            }
-        }
-    }
 }
 
 project('spring-integration-test-support') {
@@ -1137,7 +1143,7 @@ tasks.register('schemaZip', Zip) {
 }
 
 tasks.register('docsZip', Zip) {
-    dependsOn ':spring-integration-core:dokkaGenerate'
+    dependsOn dokkaProjects.collect { ":${it}:dokkaGenerate" }
     group = 'Distribution'
     archiveClassifier = 'docs'
     description = "Builds -${archiveClassifier} archive containing api and reference " +