Enable Google's Error Prone

Enabled by default to catch common Java mistakes as compile-time errors.

https://github.com/google/error-prone

pom.xml

@@ -700,6 +700,18 @@
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.1</version>
+               <!-- Enable Google's Error-Prone https://github.com/google/error-prone -->
+               <configuration>
+                 <compilerId>javac-with-errorprone</compilerId>
+                 <forceJavacCompilerUse>true</forceJavacCompilerUse>
+               </configuration>
+               <dependencies>
+                 <dependency>
+                   <groupId>org.codehaus.plexus</groupId>
+                   <artifactId>plexus-compiler-javac-errorprone</artifactId>
+                   <version>2.5</version>
+                 </dependency>
+               </dependencies>
             </plugin>
             <plugin>
                <groupId>org.apache.maven.plugins</groupId>