From 9bc181a6d013938bc0023ff5f768924aa48d675c Mon Sep 17 00:00:00 2001
From: stephwang <stephwang@google.com>
Date: Tue, 7 Apr 2020 15:34:58 -0400
Subject: [PATCH 1/2] feat: add ban duplicate classes rule

---
 pom.xml | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/pom.xml b/pom.xml
index e2092c2a..914a7e13 100644
--- a/pom.xml
+++ b/pom.xml
@@ -229,6 +229,14 @@
                   <version>[1.7,)</version>
                 </requireJavaVersion>
                 <requireUpperBoundDeps/>
+                <banDuplicateClasses>
+                  <scopes>
+                    <scope>compile</scope>
+                    <scope>provided</scope>
+                  </scopes>
+                  <findAllDuplicates>true</findAllDuplicates>
+                  <ignoreWhenIdentical>true</ignoreWhenIdentical>
+                </banDuplicateClasses>
               </rules>
             </configuration>
           </execution>

From b9c36f2607c683c4f9934c3cb0f19a82c05a5c16 Mon Sep 17 00:00:00 2001
From: stephwang <stephwang@google.com>
Date: Tue, 7 Apr 2020 17:48:17 -0400
Subject: [PATCH 2/2] feat: add extra enforcer dep

---
 pom.xml | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/pom.xml b/pom.xml
index 914a7e13..7e5f4a75 100644
--- a/pom.xml
+++ b/pom.xml
@@ -101,6 +101,13 @@
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-enforcer-plugin</artifactId>
           <version>3.0.0-M3</version>
+          <dependencies>
+            <dependency>
+              <groupId>org.codehaus.mojo</groupId>
+              <artifactId>extra-enforcer-rules</artifactId>
+              <version>1.2</version>
+            </dependency>
+          </dependencies>
         </plugin>
         <plugin>
           <groupId>org.codehaus.mojo</groupId>