add jacoco code coverage reporting

pom.xml

@@ -44,7 +44,7 @@
                 <artifactId>maven-surefire-plugin</artifactId>
                 <version>3.0.0-M3</version>
                 <configuration>
-                    <argLine>-Xmx2048m</argLine>
+                    <argLine>@{argLine} -Xmx2048m</argLine>
                     <systemProperties>
                         <property>
                             <name>java.util.logging.config.file</name>
@@ -64,6 +64,25 @@
                     </java>
                 </configuration>
             </plugin>
+            <plugin>
+                <groupId>org.jacoco</groupId>
+                <artifactId>jacoco-maven-plugin</artifactId>
+                <version>0.8.3</version>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>prepare-agent</goal>
+                        </goals>
+                    </execution>
+                    <execution>
+                        <id>report</id>
+                        <phase>test</phase>
+                        <goals>
+                            <goal>report</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
         </plugins>
     </build>