Fix bug introduced by Spring @Configuration processing

spring-bootstrap/src/main/java/org/springframework/bootstrap/context/annotation/ConfigurationPropertiesBindingConfiguration.java

@@ -58,13 +58,11 @@ public class ConfigurationPropertiesBindingConfiguration {
 
 	@ConditionalOnMissingBean(name = VALIDATOR_BEAN_NAME)
 	@ConditionalOnClass(name = "javax.validation.Validator")
-	public static class ValidatorConfiguration {
-
+	protected static class ValidatorConfiguration {
 		@Bean
 		protected Validator configurationPropertiesValidator() {
 			return new LocalValidatorFactoryBean();
 		}
-
 	}
 
 	/**

spring-bootstrap/src/test/resources/logback-test.xml

@@ -7,6 +7,7 @@
 			<pattern>${LOG_PATTERN}</pattern>
 		</encoder>
 	</appender>
+	<logger name="org.springframework.beans.factory.annotation" level="TRACE" />
 	<root level="INFO">
 		<appender-ref ref="CONSOLE" />
 	</root>