[MCOMPILER-445] add IT
diff --git a/src/it/MCOMPILER-445/invoker.properties b/src/it/MCOMPILER-445/invoker.properties
new file mode 100644
index 0000000..5e11a16
--- /dev/null
+++ b/src/it/MCOMPILER-445/invoker.properties
@@ -0,0 +1,19 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+# 
+#   http://www.apache.org/licenses/LICENSE-2.0
+# 
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+# https://bugs.openjdk.java.net/browse/JDK-8051958
+invoker.java.version = 16+
diff --git a/src/it/MCOMPILER-445/pom.xml b/src/it/MCOMPILER-445/pom.xml
new file mode 100644
index 0000000..0caf4df
--- /dev/null
+++ b/src/it/MCOMPILER-445/pom.xml
@@ -0,0 +1,59 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<!--
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership.  The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License.  You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied.  See the License for the
+specific language governing permissions and limitations
+under the License.
+-->
+
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <groupId>org.apache.maven.plugins.compiler.its</groupId>
+  <artifactId>mcompiler445</artifactId>
+  <version>1.0.0-SNAPSHOT</version>
+
+  <url>https://issues.apache.org/jira/browse/MCOMPILER-445</url>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <version>@project.version@</version>
+        <configuration>
+          <!-- makes sure JDK16 is being used -->
+          <release>16</release>
+          <!-- default, but explicitly must not fail -->
+          <fork>false</fork>
+          <!-- from zookeper -->
+          <showWarnings>true</showWarnings>
+          <compilerArgs>
+            <compilerArg>-Werror</compilerArg>
+            <compilerArg>-Xlint:deprecation</compilerArg>
+            <compilerArg>-Xlint:unchecked</compilerArg>
+            <compilerArg>-Xlint:-options</compilerArg>
+            <compilerArg>-Xdoclint:-missing</compilerArg>
+            <!-- https://issues.apache.org/jira/browse/MCOMPILER-205 -->
+            <compilerArg>-Xpkginfo:always</compilerArg>
+          </compilerArgs>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
+</project>
diff --git a/src/it/MCOMPILER-445/src/main/java/example/FinalExample.java b/src/it/MCOMPILER-445/src/main/java/example/FinalExample.java
new file mode 100644
index 0000000..f68d812
--- /dev/null
+++ b/src/it/MCOMPILER-445/src/main/java/example/FinalExample.java
@@ -0,0 +1,69 @@
+package example;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import java.util.Comparator;
+
+/**
+ * Example doclint comment.
+ *
+ * @since 3.8.2
+ */
+public class FinalExample 
+{
+    /**
+     * Example field description.
+     *
+     * @return a comparator comparing two strings.
+     */
+    public static final Comparator<String> comparator = FinalExample::nullSafeStringComparator;
+
+    /**
+     * Example method description.
+     * @param desc1 String to compare with desc2.
+     * @param desc2 String to be compared agains desc1.
+     * @return
+     *      {@code -1} if desc1 is {@code null},
+     *      {@code +1} if desc2 is {@code null} and desc1 is not,
+     *      the comparison result if it is {!= 0},
+     *      {@code 3} if the comparison result would have been {@code 0}.
+     */
+    public static int nullSafeStringComparator( String desc1, String desc2 )
+    {
+        final int compareTo;
+        if ( desc1 == null )
+        {
+            compareTo = -1;
+        }
+        else if ( desc2 == null )
+        {
+            compareTo = 1;
+        }
+        else
+        {
+            compareTo = desc1.compareTo( desc2 );
+        }
+        if ( compareTo == 0 )
+        {
+            return 3;
+        }
+        return compareTo;
+    }
+}