Spring Boot supports localized messages so that your application can cater to users of different language preferences.
By default, Spring Boot looks for the presence of a messages
resource bundle at the root of the classpath.
Note
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The auto-configuration applies when the default properties file for the configured resource bundle is available (i.e. messages.properties by default).
If your resource bundle contains only language-specific properties files, you are required to add the default.
If no properties file is found that matches any of the configured base names, there will be no auto-configured MessageSource .
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The basename of the resource bundle as well as several other attributes can be configured using the spring.messages
namespace, as shown in the following example:
spring:
messages:
basename: "messages,config.i18n.messages"
fallback-to-system-locale: false
Tip
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spring.messages.basename supports comma-separated list of locations, either a package qualifier or a resource resolved from the classpath root.
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See {spring-boot-autoconfigure-module-code}/context/MessageSourceProperties.java[MessageSourceProperties
] for more supported options.