Annotate the "JSONPermLoader" interface with the @FunctionalInterface annotation

Issue-ID: AAF-1031
Change-Id: I4619a039ec1dd7e65d1d24744bf88d73da6c7ce3
Signed-off-by: manisha07 <cmanis10@in.ibm.com>
diff --git a/auth/auth-oauth/src/main/java/org/onap/aaf/auth/oauth/service/JSONPermLoader.java b/auth/auth-oauth/src/main/java/org/onap/aaf/auth/oauth/service/JSONPermLoader.java
index 0126c2e..a0644fd 100644
--- a/auth/auth-oauth/src/main/java/org/onap/aaf/auth/oauth/service/JSONPermLoader.java
+++ b/auth/auth-oauth/src/main/java/org/onap/aaf/auth/oauth/service/JSONPermLoader.java
@@ -28,6 +28,7 @@
 import org.onap.aaf.cadi.CadiException;
 import org.onap.aaf.misc.env.APIException;
 
+@FunctionalInterface
 public interface JSONPermLoader {
     public Result<String> loadJSONPerms(AuthzTrans trans, String user, Set<String> scopes) throws APIException, CadiException;