Spring Boot Configurationproperties Validate

24.7.4 @ConfigurationProperties Validation

Spring Boot'll attempt to validate external configuration by default using JSR-303 (if it's on the classpath).
You can simply add JSR-303 javax.validation constraint annotations to your @ConfigurationProperties class:

@ConfigurationProperties (prefix= "foo")publicclass  fooproperties {    @NotNull     Private inetaddress remoteaddress;     // . .. getters and Setters }

In order to validate values of nested properties, you must annotate the associated field as to @Valid trigger its Validati On. For example, building upon the above FooProperties example:

@ConfigurationProperties (prefix= "Connection") Public classfooproperties {@NotNullPrivateinetaddress remoteaddress; @ValidPrivate FinalSecurity Security =NewSecurity (); //. .. getters and Setters     Public Static classSecurity {@NotEmpty PublicString username; //. .. getters and Setters    }}

You can also add a custom Spring by Validator creating a bean definition called configurationPropertiesValidator . The @Bean method should be declared static . The configuration Properties validator is created very early in the application ' s lifecycle and declaring the @Bean method As static allows the bean to being created without has to instantiate the @Configuration class. This avoids any problems the May is caused by early instantiation. There is a property validation sample so you can see how to set things up.

Spring Boot Configurationproperties Validate