Migrated modules to parent-boot-2 usign spring-boot 2.1:

spring-mvc-forms-thymeleaf
spring-rest
spring-rest-angular
spring-rest-query-language
spring-rest-shell
spring-rest-simple
spring-rest-template
spring-resttemplate
spring-security-mvc-boot
spring-security-openid
spring-security-sso
spring-security-thymeleaf

spring-rest-angular/src/main/java/org/baeldung/web/main/Application.java

@@ -6,12 +6,12 @@ import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Import;
 import org.springframework.web.filter.ShallowEtagHeaderFilter;
-import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
 
 @SpringBootApplication
 @EnableAutoConfiguration
 @Import(PersistenceConfig.class)
-public class Application extends WebMvcConfigurerAdapter {
+public class Application implements WebMvcConfigurer {
 
     public static void main(String[] args) {
         SpringApplication.run(Application.class, args);