Here is BlockingHomeController working example if you interest how to use BlockingImageService. Don't forget to use @Service annotation before "public class BlockingImageService" and "turn off" HomeController by simply commenting @Controller annotation before public class HomeController
https://gist.github.com/a576addf3103e3a1f78b9ec2b0127c72
Here is
BlockingHomeControllerworking example if you interest how to useBlockingImageService. Don't forget to use@Serviceannotation before "public class BlockingImageService" and "turn off"HomeControllerby simply commenting@Controllerannotation beforepublic class HomeControllerhttps://gist.github.com/a576addf3103e3a1f78b9ec2b0127c72