Merge remote-tracking branch 'origin/5.4.x' into 6.0.x

samples/client/petstore/java/vertx-no-nullable/build.gradle

@@ -5,19 +5,21 @@ group = 'org.openapitools'
 version = '1.0.0'
 
 repositories {
-    maven { url "https://repo1.maven.org/maven2" }
-    jcenter()
+    mavenCentral()
 }
 
 apply plugin: 'java'
-apply plugin: 'maven'
+apply plugin: 'maven-publish'
 
 sourceCompatibility = JavaVersion.VERSION_1_8
 targetCompatibility = JavaVersion.VERSION_1_8
 
-install {
-    repositories.mavenInstaller {
-        pom.artifactId = 'petstore-vertx-no-nullable'
+publishing {
+    publications {
+        maven(MavenPublication) {
+            artifactId = 'petstore-vertx-no-nullable'
+            from components.java
+        }
     }
 }