ch04: Fixing package paths and addings imports

[KoStard]

When running the application as-is, I was getting exceptions:

ch04/exercises/image-of-the-day
❯ docker image build -t image-of-the-day .
...
❯ docker container run --name iotd -d -p 800:80 --network nat image-of-the-day
...
❯ docker container logs iotd

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.1.3.RELEASE)

2023-01-01 14:09:01.516  INFO 1 --- [           main] iotd.Application                         : Starting Application v0.1.0 on a73b3c3cbbab with PID 1 (/app/iotd-service-0.1.0.jar started by root in /app)
2023-01-01 14:09:01.518  INFO 1 --- [           main] iotd.Application                         : No active profile set, falling back to default profiles: default
2023-01-01 14:09:01.651  WARN 1 --- [           main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanDefinitionStoreException: Failed to parse configuration class [iotd.Application]; nested exception is org.springframework.context.annotation.ConflictingBeanDefinitionException: Annotation-specified bean name 'imageController' for bean class [iotd.ImageController] conflicts with existing, non-compatible bean definition of same name and class [iotd.controllers.ImageController]
2023-01-01 14:09:01.846 ERROR 1 --- [           main] o.s.boot.SpringApplication               : Application run failed

org.springframework.beans.factory.BeanDefinitionStoreException: Failed to parse configuration class [iotd.Application]; nested exception is org.springframework.context.annotation.ConflictingBeanDefinitionException: Annotation-specified bean name 'imageController' for bean class [iotd.ImageController] conflicts with existing, non-compatible bean definition of same name and class [iotd.controllers.ImageController]
	at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:181) ~[spring-context-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]
	at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:315) ~[spring-context-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]
	at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:232) ~[spring-context-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]
	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:275) ~[spring-context-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]
	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:95) ~[spring-context-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:705) ~[spring-context-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:531) ~[spring-context-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142) ~[spring-boot-2.1.3.RELEASE.jar!/:2.1.3.RELEASE]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) ~[spring-boot-2.1.3.RELEASE.jar!/:2.1.3.RELEASE]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) ~[spring-boot-2.1.3.RELEASE.jar!/:2.1.3.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:316) ~[spring-boot-2.1.3.RELEASE.jar!/:2.1.3.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260) ~[spring-boot-2.1.3.RELEASE.jar!/:2.1.3.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248) ~[spring-boot-2.1.3.RELEASE.jar!/:2.1.3.RELEASE]
	at iotd.Application.main(Application.java:18) ~[classes!/:0.1.0]
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:na]
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:na]
	at java.base/java.lang.reflect.Method.invoke(Unknown Source) ~[na:na]
	at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48) ~[iotd-service-0.1.0.jar:0.1.0]
	at org.springframework.boot.loader.Launcher.launch(Launcher.java:87) ~[iotd-service-0.1.0.jar:0.1.0]
	at org.springframework.boot.loader.Launcher.launch(Launcher.java:50) ~[iotd-service-0.1.0.jar:0.1.0]
	at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:51) ~[iotd-service-0.1.0.jar:0.1.0]
Caused by: org.springframework.context.annotation.ConflictingBeanDefinitionException: Annotation-specified bean name 'imageController' for bean class [iotd.ImageController] conflicts with existing, non-compatible bean definition of same name and class [iotd.controllers.ImageController]
	at org.springframework.context.annotation.ClassPathBeanDefinitionScanner.checkCandidate(ClassPathBeanDefinitionScanner.java:348) ~[spring-context-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]
	at org.springframework.context.annotation.ClassPathBeanDefinitionScanner.doScan(ClassPathBeanDefinitionScanner.java:286) ~[spring-context-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]
	at org.springframework.context.annotation.ComponentScanAnnotationParser.parse(ComponentScanAnnotationParser.java:132) ~[spring-context-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]
	at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:287) ~[spring-context-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]
	at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:242) ~[spring-context-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]
	at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:199) ~[spring-context-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]
	at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:167) ~[spring-context-5.1.5.RELEASE.jar!/:5.1.5.RELEASE]
	... 21 common frames omitted

Then noticed that the package paths are incorrect. After this fix, it was working correctly.