Make project Java 9 proof

Author: rfscholte

pom.xml

@@ -273,6 +273,11 @@ under the License.
             </excludes>
           </configuration>
         </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-plugin-plugin</artifactId>
+           <version>3.5</version>
+        </plugin>
       </plugins>
     </pluginManagement>
     <plugins>
@@ -301,7 +306,6 @@ under the License.
       <plugin>
         <groupId>org.codehaus.mojo</groupId>
         <artifactId>animal-sniffer-maven-plugin</artifactId>
-        <version>1.13</version>
         <configuration>
           <signature>
             <groupId>org.codehaus.mojo.signature</groupId>
@@ -322,6 +326,7 @@ under the License.
       <plugin>
         <groupId>org.codehaus.plexus</groupId>
         <artifactId>plexus-component-metadata</artifactId>
+        <version>1.7.1</version>
         <executions>
           <execution>
             <goals>
@@ -392,6 +397,42 @@ under the License.
         </plugins>
       </reporting>
     </profile>
+    
+    <profile>
+      <id>jdk9</id>
+      <activation>
+        <jdk>[9,)</jdk>
+      </activation>
+      <build>
+        <plugins>
+          <plugin>
+            <groupId>org.apache.maven.plugins</groupId>
+            <artifactId>maven-enforcer-plugin</artifactId>
+            <executions>
+              <execution>
+                <id>enforce-bytecode-version</id>
+                <configuration>
+                  <rules>
+                    <enforceBytecodeVersion>
+                      <excludes>
+                        <exclude>javax.xml.bind:jaxb-api</exclude>
+                      </excludes>
+                    </enforceBytecodeVersion>
+                  </rules>
+                </configuration>
+              </execution>
+            </executions>
+          </plugin>
+        </plugins>
+      </build>
+      <dependencies>
+        <dependency>
+          <groupId>javax.xml.bind</groupId>
+          <artifactId>jaxb-api</artifactId>
+          <version>2.3.0</version>
+        </dependency>
+      </dependencies>
+    </profile>
   </profiles>
 
 </project>

src/it/MCHECKSTYLE-332_cache-treewalker/pom.xml

@@ -41,13 +41,19 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-checkstyle-plugin</artifactId>
-        <version>@pom.version@</version>
+        <version>@project.version@</version>
         <dependencies>
           <!-- force usage of 6.15, where the cacheFile property is in the TreeWalker module -->
           <dependency>
             <groupId>com.puppycrawl.tools</groupId>
             <artifactId>checkstyle</artifactId>
             <version>6.15</version>
+            <exclusions>
+              <exclusion>
+                <groupId>com.sun</groupId>
+                <artifactId>tools</artifactId>
+              </exclusion>
+            </exclusions>
           </dependency>
         </dependencies>
       </plugin>