Could not find artifact com.sun:tools:jar:0

[ValeKnappich]

Hi I'm trying to get cobertura to work, but somehow I cannot seem to figure it out.
I added the most basic config from the docs to the pom.xml. All mvn commands run fine but when running cobertura commands I always get an error saying that a dependency couldnt be resolved:

$ mvn clean cobertura:cobertura

\[ERROR\] Failed to execute goal org.codehaus.mojo:cobertura-maven-plugin:2.7:instrument (default-cli) on project openfasttrace-parent: Execution default-cli of goal org.codehaus.mojo:cobertura-maven-plugin:2.7:instrument failed: Plugin org.codehaus.mojo:cobertura-maven-plugin:2.7 or one of its dependencies could not be resolved: Could not find artifact com.sun:tools:jar:0 at specified path /usr/lib/jvm/java-11-openjdk-amd64/../lib/tools.jar -> \[Help 1\] 

To make sure its not a peculiarity of my system, I reproduced the error in a Colab Notebook And yes, I did install JDK and not JRE! Compilation and all works absolutely fine. Tried both apt and binary installation. Occurs with every repository I tried. Appreciate any help!

pom.xml:

<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>org.itsallcode.openfasttrace</groupId>
    <version>0.0.0</version>
    <artifactId>openfasttrace-root</artifactId>
    <name>OpenFastTrace Root Project</name>
    <packaging>pom</packaging>
    <modules>
        <module>parent</module>
        <module>api</module>
        <module>core</module>
        <module>product</module>
        <module>exporter/common</module>
        <module>exporter/markdown</module>
        <module>exporter/specobject</module>
        <module>importer/markdown</module>
        <module>importer/specobject</module>
        <module>importer/tag</module>
        <module>importer/zip</module>
        <module>reporter/plaintext</module>
        <module>reporter/html</module>
        <module>reporter/aspec</module>
        <module>testutil</module>
    </modules>
    <reporting>
        <plugins>
            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>cobertura-maven-plugin</artifactId>
                <version>2.7</version>
            </plugin>
        </plugins>
    </reporting>
</project>

Steps to reproduce:

# Install JDK
apt install default-jdk

# Install Maven
wget https://dlcdn.apache.org/maven/maven-3/3.8.6/binaries/apache-maven-3.8.6-bin.tar.gz
tar xvfz apache-maven-3.8.6-bin.tar.gz

# Clone Repo
git clone https://github.com/itsallcode/openfasttrace.git

# Add Cobertura to pom.xml
printf '\n<project xmlns="http://maven.apache.org/POM/4.0.0"\n    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"\n    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">\n    <modelVersion>4.0.0</modelVersion>\n    <groupId>org.itsallcode.openfasttrace</groupId>\n    <version>0.0.0</version>\n    <artifactId>openfasttrace-root</artifactId>\n    <name>OpenFastTrace Root Project</name>\n    <packaging>pom</packaging>\n    <modules>\n        <module>parent</module>\n        <module>api</module>\n        <module>core</module>\n        <module>product</module>\n        <module>exporter/common</module>\n        <module>exporter/markdown</module>\n        <module>exporter/specobject</module>\n        <module>importer/markdown</module>\n        <module>importer/specobject</module>\n        <module>importer/tag</module>\n        <module>importer/zip</module>\n        <module>reporter/plaintext</module>\n        <module>reporter/html</module>\n        <module>reporter/aspec</module>\n        <module>testutil</module>\n    </modules>\n    <reporting>\n        <plugins>\n            <plugin>\n                <groupId>org.codehaus.mojo</groupId>\n                <artifactId>cobertura-maven-plugin</artifactId>\n                <version>2.7</version>\n            </plugin>\n        </plugins>\n    </reporting>\n</project>\n' > openfasttrace/pom.xml

# Attempt instrumentation
cd openfasttrace
../apache-maven-3.6.3/bin/mvn clean cobertura:cobertura


[ERROR] Failed to execute goal org.codehaus.mojo:cobertura-maven-plugin:2.7:instrument (default-cli) on project openfasttrace-parent: Execution default-cli of goal org.codehaus.mojo:cobertura-maven-plugin:2.7:instrument failed: Plugin org.codehaus.mojo:cobertura-maven-plugin:2.7 or one of its dependencies could not be resolved: Could not find artifact com.sun:tools:jar:0 at specified path /usr/lib/jvm/java-11-openjdk-amd64/../lib/tools.jar -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/PluginResolutionException

[zbynek]

Looks like this plugin is not compatible with recent versions of Java, since Java 9 removed tools.jar.