[Java] Maven multi-module project uploaded to the collection Sonar scanning problems

When uploading to Soanr, the project has a number of unit tests, but the coverage is 0

Modify pom.xml

                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-surefire-plugin</artifactId>
                    <version>2.4.2</version>
                    <configuration>
                        <skipTests>false</skipTests>
                        <testFailureIgnore>true</testFailureIgnore>
                        <includes>
                            <include>**/*Test.java</include>
                        </includes>
                        <excludes>
                            <!--<exclude>**/Abstract*.java</exclude>-->
                            <!--<exclude>**/*Service.java</exclude>-->
                        </excludes>
                    </configuration>
                </plugin>
                <plugin>
                    <groupId>org.jacoco</groupId>
                    <artifactId>jacoco-maven-plugin</artifactId>
                    <version>0.7.9</version>
                    <executions>
                        <execution>
                            <id>pre-test</id>
                            <goals>
                                <goal>prepare-agent</goal>
                            </goals>
                        </execution>
                    </executions>
                </plugin>

If necessary, to bring parameters

clean cobertura:cobertura -Dcobertura.report.format=xml package -Dmaven.test.failure.ignore=true sonar:sonar -Dsonar.language=java

When scanning a multi-module project uploaded to the Sonar by Jenkins, code coverage is very low, covering only a single code module, then the problem can be solved by configuring JaCoCo.
Reference material

Modify pom.xml

            <plugin>
                <groupId>org.jacoco</groupId>
                <artifactId>jacoco-maven-plugin</artifactId>
                <version>0.7.9</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>prepare-agent</goal>
                        </goals>
                    </execution>
                    <execution>
                        <id>report</id>
                        <phase>prepare-package</phase>
                        <goals>
                            <goal>report</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>

By clean org.jacoco:jacoco-maven-plugin:prepare-agent jacoco:report-aggregate installmay be generated at a target jacoco-aggregatereports cover

Note: jacoco versions earlier than 0.7.9 jacoco:report-aggregateparameter may not exist
multi-module project to integrate coverage you can also specify the reportdirectory

 <properties>
        <sonar.java.coveragePlugin>jacoco</sonar.java.coveragePlugin>
        <sonar.dynamicAnalysis>reuseReports</sonar.dynamicAnalysis>
        <sonar.jacoco.reportPath>${project.basedir}/../target/jacoco.exec</sonar.jacoco.reportPath>
 </properties>        

 <build>
         <pluginManagement>
            <plugins>
                <plugin>
                    <groupId>org.jacoco</groupId>
                    <artifactId>jacoco-maven-plugin</artifactId>
                    <version>0.7.9</version>
                    <configuration>
                        <destFile>${sonar.jacoco.reportPath}</destFile>
                        <append>true</append>
                    </configuration>
                    <executions>
                        <execution>
                            <goals>
                                <goal>prepare-agent</goal>
                            </goals>
                        </execution>
                        <execution>
                            <id>report</id>
                            <phase>prepare-package</phase>
                            <goals>
                                <goal>report</goal>
                            </goals>
                        </execution>
                    </executions>
                </plugin>
            </plugins>
        </pluginManagement>
 </build>