What is the main problem of the chosen solution structure - No special exception handling during startup - Configuration class without @Configuration annotations - Incorrect dependency injection setup - Incorrect integration of custom configs changing property load order - @Autowired dependencies missing

The main issues with the chosen solution structure are related to incorrect configuration and dependency management in Spring:

• Lack of exception handling during startup can lead to unhandled errors and application crashes.

• Configuration class without @Configuration annotation will not be recognized by Spring as a bean source, and its @Bean methods will not be invoked.

• Incorrect DI dependency setup (e.g., missing @Autowired or incorrect initialization order) will result in necessary components not being injected, causing runtime errors.

• Incorrect integration of custom configurations that change the property loading order can lead to properties being loaded in the wrong sequence, causing incorrect application behavior.

• Absence of @Autowired for dependencies means Spring cannot automatically inject the required beans, leading to NullPointerException or other errors.

Overall, the main problem is a violation of basic Spring configuration principles, which leads to improper context initialization and unstable application operation.