linkage checker and shared deps BOM

pom.xml

@@ -78,7 +78,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-shared-dependencies</artifactId>
-        <version>0.10.0</version>
+        <version>0.14.1</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>
@@ -211,6 +211,46 @@
   </dependencies>
   <build>
     <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-enforcer-plugin</artifactId>
+        <version>3.0.0-M3</version>
+        <dependencies>
+          <dependency>
+            <groupId>com.google.cloud.tools</groupId>
+            <artifactId>linkage-checker-enforcer-rules</artifactId>
+            <version>1.5.4</version>
+          </dependency>
+          <dependency>
+            <groupId>org.codehaus.mojo</groupId>
+            <artifactId>extra-enforcer-rules</artifactId>
+            <version>1.3</version>
+            <exclusions>
+              <exclusion>
+                <groupId>org.eclipse.aether</groupId>
+                <artifactId>aether-util</artifactId>
+              </exclusion>
+            </exclusions>
+            <scope>compile</scope>
+          </dependency>
+        </dependencies>
+        <executions>
+          <execution>
+            <id>enforce-linkage-checker</id>
+            <!-- Important! Should run after compile -->
+            <phase>verify</phase>
+            <goals>
+              <goal>enforce</goal>
+            </goals>
+            <configuration>
+              <rules>
+                <LinkageCheckerRule
+                  implementation="com.google.cloud.tools.dependencies.enforcer.LinkageCheckerRule"/>
+              </rules>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-surefire-plugin</artifactId>