Upgrade to JDK-16

pom.xml

@@ -15,8 +15,8 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <maven.compiler.source>11</maven.compiler.source>
-        <maven.compiler.target>11</maven.compiler.target>
+        <maven.compiler.source>16</maven.compiler.source>
+        <maven.compiler.target>16</maven.compiler.target>
     </properties>
 
     <distributionManagement>
@@ -101,8 +101,8 @@
                 <artifactId>maven-compiler-plugin</artifactId>
                 <version>3.8.1</version>
                 <configuration>
-                    <source>11</source>
-                    <target>11</target>
+                    <source>16</source>
+                    <target>16</target>
                 </configuration>
             </plugin>
             <plugin>
@@ -131,7 +131,7 @@
                     </execution>
                 </executions>
                 <configuration>
-                    <source>11</source>
+                    <source>16</source>
                 </configuration>
             </plugin>
             <plugin>