Add Java 16 profile.
diff --git a/pom.xml b/pom.xml
index 91f6c0a..5b96702 100644
--- a/pom.xml
+++ b/pom.xml
@@ -815,6 +815,27 @@
         <coveralls.skip>true</coveralls.skip>

       </properties>

     </profile>

+    <profile>

+      <id>java16</id>

+      <!-- For testing with CGLIB on Java 16 and 17-ea. -->

+      <activation>

+        <jdk>[16,)</jdk>

+      </activation>

+      <build>

+        <plugins>

+          <plugin>

+            <groupId>org.apache.maven.plugins</groupId>

+            <artifactId>maven-surefire-plugin</artifactId>

+            <configuration>

+              <argLine>

+                --illegal-access=permit

+                --add-opens java.base/java.lang=ALL-UNNAMED                     

+              </argLine>

+            </configuration>

+          </plugin>

+        </plugins>

+      </build>

+    </profile>

     <!-- Uncomment this and set the path accordingly to enable YourKit -->

     <!-- http://www.yourkit.com/docs/80/help/agent.jsp -->

     <!-- <profile>