package org.test;

@SpringBootApplication
@Configuration
public class TestApplication {
    public static void main(String[] args) {
        SpringApplication.run(TestApplication.class, args);
    }
}

-----------------------------------
package org.test;

@Widgetset("AppWidgetset")
@PreserveOnRefresh
@SpringUI
public class TestUI extends UI {

//create Components, add them, etc

}
-----------------------------------

package org.test.config;
@Configuration
public class TestConfig {
    @Bean
    ImageCache imageCache(){
        return new ImageCache();
    }
}

-----------------------------------

ImageCache.java is nothing special just a class retrieving images from HTTP resources or if cached give them from disk

-----------------------------------

package org.test.ui;
public class MovieComponent extends CustomComponent {
    //some irrelevant fields

    @Autowired
    private ImageCache imageCache;

    private static Integer COMPONENT_WIDTH = MovieSearchEngineComponent.posterSize.getWidth();
    private static Integer COMPONENT_HEIGHT = MovieSearchEngineComponent.posterSize.getHeight();

    // public MovieComponent(MovieInfo movie) {
    public MovieComponent(MovieDb movie) {
        .....
        imageCache.get(...);
        ....
        initGui();
    }

    private void initGui() {
        ........
    }