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Discover how to effectively implement `Internationalization` in Spring Boot configuration files. Learn about LocaleResolver and MessageSource for multilingual support.
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Solving the Internationalization Issue in Spring Boot Configuration Files

In today's globalized world, internationalization (i18n) in applications is crucial for providing a seamless user experience across different languages. If you’re using Spring Boot, configuring internationalization support can often lead to confusion – especially when it works in one part of your application but not another.

Recently, a common problem arose for a developer trying to implement internationalization in their Spring Boot application: despite configuring everything in a separate configuration class, they found that the error messages were still returning in English instead of the intended Russian language. Let's dive into this issue and unravel the solution.

Understanding the Problem

The developer had set up a configuration class, ConfigForAuth, meant to manage localization through a LocaleResolver and a MessageSource. Here's a brief look at the key points from their implementation:

The Setup

LocaleResolver: The SessionLocaleResolver is configured with the default locale set to Russian (new Locale("ru")).

MessageSource: A ReloadableResourceBundleMessageSource is used to load messages from the i18n/messages properties files.

LocaleChangeInterceptor: This component is supposed to handle language changes through a specified parameter.

However, when the same code was executed in the main application file, it worked as expected, displaying error messages in Russian. The contrast in behavior hinted at a deeper issue regarding how Spring Boot handled the configurations in separate classes.

The Solution Unveiled

After analyzing the situation, the solution to ensure the internationalization functionalities work seamlessly lies in a couple of adjustments:

Step 1: Change the Parameter Name

The original implementation of the LocaleChangeInterceptor had the parameter for changing the language set to "locale". To resolve the issue, this needs to be modified to "lang":

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Step 2: Register the LocaleChangeInterceptor

To make sure that the interceptor is recognized, you need to register it in your configuration class. This can be accomplished by extending the WebMvcConfigurer interface and providing an implementation for the addInterceptors method:

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Final Thoughts

By ensuring that your LocaleChangeInterceptor is correctly registered and configured to use the appropriate parameter name, your Spring Boot application should correctly display messages in the Russian language (or any other specified language) as intended.

Key Takeaways

Always verify the parameter name used in your LocaleChangeInterceptor.

Extend WebMvcConfigurer and appropriately register your interceptors to guarantee functionality.

Testing in both configurations can help identify differences that may lead to unexpected behaviors.

Implementing internationalization in your Spring Boot application might take some tuning, but with the right configuration, you can provide a user-friendly experience across various languages. By following the adjustments above, you can ensure your application meets the internationalization needs effectively.

Happy coding!