Document that placeholders in @DefaultValue annotations are not resolved #23164
Description
My application uses @DefaultValue annotation with a SpEl expression as default value. I assumed SpringBoot resolves the expression, but SpringBoot doesn't.
Example:
@SpringBootApplication @EnableConfigurationProperties(SampleApplication.SampleProperties.class) public class SampleApplication { @ConstructorBinding @ConfigurationProperties("sample") public static class SampleProperties { public SampleProperties(String prop1, @DefaultValue("${sample.prop1}") String prop2) { System.out.println("prop1=" + prop1); System.out.println("prop2=" + prop2); } } public static void main(String[] args) { System.setProperty("sample.prop1", "Hello World"); SpringApplication.run(SampleApplication.class, args); } }Actual output:
prop1=Hello World prop2=${sample.prop1} Expected output:
prop1=Hello World prop2=Hello World It would be nice, if SpEl expressions in the @DefaultValue annotations would be resolved as for other Spring annotations, for example, the@Value annotation.