Add commons.javadoc15.java.link.
diff --git a/pom.xml b/pom.xml
index c6bd9d8..af1b885 100644
--- a/pom.xml
+++ b/pom.xml
@@ -273,6 +273,7 @@
     <commons.javadoc12.java.link>https://docs.oracle.com/en/java/javase/12/docs/api/</commons.javadoc12.java.link>
     <commons.javadoc13.java.link>https://docs.oracle.com/en/java/javase/13/docs/api/</commons.javadoc13.java.link>
     <commons.javadoc14.java.link>https://docs.oracle.com/en/java/javase/14/docs/api/</commons.javadoc14.java.link>
+    <commons.javadoc15.java.link>https://docs.oracle.com/en/java/javase/15/docs/api/</commons.javadoc15.java.link>
 
     <commons.javadoc.java.link>${commons.javadoc7.java.link}</commons.javadoc.java.link>