diff --git a/cas/spring-security-cas.gradle b/cas/spring-security-cas.gradle
index 23c5f04a56..bb4f9e8729 100644
--- a/cas/spring-security-cas.gradle
+++ b/cas/spring-security-cas.gradle
@@ -1,5 +1,6 @@
 plugins {
 	id 'security-nullability'
+	id 'javadoc-warnings-error'
 }
 
 apply plugin: 'io.spring.convention.spring-module'