SonarQube code coverage with JaCoCo in Multi module maven

There are lots of answered questions on SO, but I still can't get this to work. I have a multi module Maven project. I followed https://www.baeldung.com/maven-jacoco-multi-module-project to set up JaCoCo. I have a report-aggregate/target/site directory, and jacoco-aggregate/index.html shows 100% coverage.

When I run mvn install sonar:sonar I get a warning for each submodule

No coverage report can be found with sonar.coverage.jacoco.xmlReportPaths='C:\Users\me\IdeaProjects\test\sub2/target/site/jacoco-aggregate/jacoco.xml'. Using default locations: target/site/jacoco/jacoco.xml,target/site/jacoco-it/jacoco.xml,build/reports/jacoco/test/jacocoTestReport.xml

That is for sub2, sub1 and the main module, in that order, and with sonar.coverage.jacoco.xmlReportPaths set to ${project.basedir}/target/site/jacoco-aggregate/jacoco.xml. On http://mysonarqube:9000 it says "Coverage not computed".

When I change sonar.coverage.jacoco.xmlReportPaths to ${project.basedir}/report-aggregate/target/site/jacoco-aggregate/jacoco.xml I get the same warnings for sub2, sub1 and report-aggregate, because C:\Users\me\IdeaProjects\test\report-aggregate/report-aggregate/target/site/jacoco-aggregate/jacoco.xml can't be found.

The Maven output does say in both cases

Importing 1 report(s). Turn your logs in debug mode in order to see the exhaustive list.

mvn install sonar:sonar -X shows that the report xml is found, and at a late point

[DEBUG] 'Generic Coverage Report' skipped because of missing configuration requirements.
Accessed configuration:
- sonar.coverageReportPaths: <empty>

I tried setting sonar.coverageReportPaths to the same value as sonar.coverage.jacoco.xmlReportPaths, but it only led to an exception because the xml format is different.

These lines are also always in the output:

[WARNING] Missing blame information for the following files:
[WARNING] * pom.xml
[WARNING] This may lead to missing/broken features in SonarQube

The documentation says it's related to fancy git states. For this test project I'm on the master branch with an initial commit only. Edit: pom.xml was simply not committed.

How can I have my project with the report-aggregate analysed with SonarQube, including the code coverage? Thanks in advance.

This is my pom.xml:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>me.test</groupId>
    <artifactId>test</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>pom</packaging>

    <modules>
        <module>sub1</module>
        <module>sub2</module>
        <module>report-aggregate</module>
    </modules>

    <properties>
        <maven.compiler.source>17</maven.compiler.source>
        <maven.compiler.target>17</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

        <sonar.plugin.version>5.0.0.4389</sonar.plugin.version>
        <sonar.projectKey>test</sonar.projectKey>
        <sonar.projectName>test</sonar.projectName>
        <sonar.qualitygate.wait>true</sonar.qualitygate.wait>
        <sonar.java.coveragePlugin>jacoco</sonar.java.coveragePlugin>
        <sonar.dynamicAnalysis>reuseReports</sonar.dynamicAnalysis>
        <sonar.host.url>http://mysonarqube:9000</sonar.host.url>
        <sonar.token>***</sonar.token>
        <sonar.coverage.jacoco.xmlReportPaths>
            ${project.basedir}/target/site/jacoco-aggregate/jacoco.xml
        </sonar.coverage.jacoco.xmlReportPaths>
        <sonar.language>java</sonar.language>
    </properties>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.junit.jupiter</groupId>
                <artifactId>junit-jupiter</artifactId>
                <version>5.11.3</version>
                <scope>test</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.jacoco</groupId>
                <artifactId>jacoco-maven-plugin</artifactId>
                <version>0.8.11</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>prepare-agent</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>

        <pluginManagement>
            <plugins>
                <plugin>
                    <groupId>org.sonarsource.scanner.maven</groupId>
                    <artifactId>sonar-maven-plugin</artifactId>
                    <version>5.0.0.4389</version>
                </plugin>
            </plugins>
        </pluginManagement>
    </build>
</project>

And report-aggregate/pom.xml:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.unisys.ch.nabodat</groupId>
        <artifactId>test</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <artifactId>report-aggregate</artifactId>

    <properties>
        <maven.compiler.source>17</maven.compiler.source>
        <maven.compiler.target>17</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <dependencies>
        <dependency>
            <groupId>com.unisys.ch.nabodat</groupId>
            <artifactId>sub1</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>com.unisys.ch.nabodat</groupId>
            <artifactId>sub2</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.jacoco</groupId>
                <artifactId>jacoco-maven-plugin</artifactId>
                <executions>
                    <execution>
                        <phase>verify</phase>
                        <goals>
                            <goal>report-aggregate</goal>
                        </goals>
                        <configuration>
                            <dataFileIncludes>
                                <dataFileInclude>**/jacoco.exec</dataFileInclude>
                            </dataFileIncludes>
                            <outputDirectory>${project.reporting.outputDirectory}/jacoco-aggregate</outputDirectory>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>