We Keep Coding

Sonar coverage is not calculated

I am trying to integrate my code coverage into the sonar but it shows 0.
I have integrated jacoco as below to my pom but, it still shows the code coverage as zero.
I have only used the pom file from this repository, what other configuration should I work in order to have code coverage ?
What would be other parameters should I possibly add?
https://github.com/daniel-frak/keycloak-user-migration/blob/master/pom.xml
Thanks.
Full repo:
https://github.com/daniel-frak/keycloak-user-migration

There are a number of things that can cause this.
The first thing you should do is examine the workspace to see if the Jacoco plugin wrote its output files anywhere in the "target" tree. It will generate a data file in one or more formats, but it will also generate an html tree, with an "index.html" in the root. You can visit that file, and it will show your coverage results.
If you don't find those files, then either your jacoco plugin is not properly integrated with your surefire plugin, or you simply didn't run your unit tests in the build (don't laugh, I've seen people do this).
The "integration" is done by telling Jacoco what variable to put the required command line into, and telling Surefire to use that variable.
Here is a sample jacoco plugin definition:
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>${jacoco.maven.plugin.version}</version>
<executions>
<execution>
<id>pre-unit-test</id>
<goals>
<goal>prepare-agent</goal>
</goals>
<configuration>
<propertyName>surefireArgLine</propertyName>
</configuration>
</execution>
<execution>
<id>post-unit-test</id>
<phase>test</phase>
<goals>
<goal>report</goal>
</goals>
<configuration>
<outputDirectory>${jacoco.path}</outputDirectory>
</configuration>
</execution>
</executions>
</plugin>
Note the reference to "surefireArgLine". Here is the Surefire definition that goes with that:
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<version>${maven.surefire.plugin.version}</version>
<configuration>
<argLine>${surefireArgLine}</argLine>
</configuration>
</plugin>
We also combine this with these property settings:
<jacoco.path>${basedir}/target/jacoco_report</jacoco.path>
<sonar.coverage.jacoco.xmlReportPaths>${basedir}/target/jacoco_report/jacoco.xml</sonar.coverage.jacoco.xmlReportPaths>

Getting Skipping JaCoCo execution due to missing execution data file [duplicate]

I'm using Maven 3.0.3, JUnit 4.8.1, and Jacoco 0.6.3.201306030806, and I am trying to create test coverage reports.
I have a project with unit tests only, but I can't get reports to run, I'm repeatedly getting the error: Skipping JaCoCo execution due to missing execution data file when I run:
mvn clean install -P test-coverage
Here is how my pom is configured:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.14.1</version>
<configuration>
<reuseForks>true</reuseForks>
<argLine>-Xmx2048m</argLine>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-failsafe-plugin</artifactId>
<version>2.14.1</version>
<configuration>
<reuseForks>true</reuseForks>
<argLine>-Xmx4096m -XX:MaxPermSize=512M ${itCoverageAgent}</argLine>
</configuration>
<executions>
<execution>
<goals>
<goal>integration-test</goal>
<goal>verify</goal>
</goals>
</execution>
</executions>
</plugin>
...
<profile>
<id>test-coverage</id>
<build>
<plugins>
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>0.6.3.201306030806</version>
<configuration>
<destfile>${basedir}/target/coverage-reports/jacoco-unit.exec</destfile>
<datafile>${basedir}/target/coverage-reports/jacoco-unit.exec</datafile>
</configuration>
<executions>
<execution>
<id>prepare-unit-tests</id>
<goals>
<goal>prepare-agent</goal>
</goals>
</execution>
<!-- prepare agent for measuring integration tests -->
<execution>
<id>prepare-integration-tests</id>
<goals>
<goal>prepare-agent</goal>
</goals>
<phase>pre-integration-test</phase>
<configuration>
<propertyName>itCoverageAgent</propertyName>
</configuration>
</execution>
<execution>
<id>jacoco-site</id>
<phase>verify</phase>
<goals>
<goal>report</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</profile>
All my tests run successfully. Here is some of the output from Maven:
[INFO] --- jacoco-maven-plugin:0.6.2.201302030002:prepare-agent (prepare-unit-tests) # myproject ---
[INFO] argLine set to -javaagent:/Users/davea/.m2/repository/org/jacoco/org.jacoco.agent/0.6.2.201302030002/org.jacoco.agent-0.6.2.201302030002-runtime.jar=destfile=/Users/davea/Dropbox/workspace/myproject/target/jacoco.exec
[INFO]
...
Tests run: 14, Failures: 0, Errors: 0, Skipped: 0
[INFO]
...
[INFO]
[INFO] --- jacoco-maven-plugin:0.6.2.201302030002:prepare-agent (prepare-integration-tests) # myproject ---
[INFO] itCoverageAgent set to -javaagent:/Users/davea/.m2/repository/org/jacoco/org.jacoco.agent/0.6.2.201302030002/org.jacoco.agent-0.6.2.201302030002-runtime.jar=destfile=/Users/davea/Dropbox/workspace/myproject/target/jacoco.exec
[INFO]
[INFO] --- maven-failsafe-plugin:2.14.1:integration-test (default) # myproject ---
[WARNING] File encoding has not been set, using platform encoding MacRoman, i.e. build is platform dependent!
[INFO]
[INFO] --- maven-failsafe-plugin:2.14.1:verify (default) # myproject ---
[INFO] Failsafe report directory: /Users/davea/Dropbox/workspace/myproject/target/failsafe-reports
[WARNING] File encoding has not been set, using platform encoding MacRoman, i.e. build is platform dependent!
[INFO]
[INFO] --- jacoco-maven-plugin:0.6.2.201302030002:report (jacoco-site) # myproject ---
[INFO] Skipping JaCoCo execution due to missing execution data file
[INFO]
Any ideas what configuration I'm missing?

jacoco-maven-plugin:0.7.10-SNAPSHOT
From jacoco:prepare-agent that says:
One of the ways to do this in case of maven-surefire-plugin - is to
use syntax for late property evaluation:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<configuration>
<argLine>#{argLine} -your -extra -arguments</argLine>
</configuration>
</plugin>
Note the #{argLine} that's added to -your -extra -arguments.
Thanks Slava Semushin for noticing the change and reporting in the comment.
jacoco-maven-plugin:0.7.2-SNAPSHOT
Following jacoco:prepare-agent that says:
[org.jacoco:jacoco-maven-plugin:0.7.2-SNAPSHOT:prepare-agent] Prepares a property pointing to the JaCoCo runtime agent that can be
passed as a VM argument to the application under test. Depending on
the project packaging type by default a property with the following
name is set:
tycho.testArgLine for packaging type eclipse-test-plugin and
argLine otherwise.
Note that these properties must not be overwritten by the
test configuration, otherwise the JaCoCo agent cannot be attached. If
you need custom parameters please append them. For example:
<argLine>${argLine} -your -extra -arguments</argLine>
Resulting
coverage information is collected during execution and by default
written to a file when the process terminates.
you should change the following line in maven-surefire-plugin plugin configuration from (note the ${argLine} inside <argLine>):
<argLine>-Xmx2048m</argLine>
to
<argLine>${argLine} -Xmx2048m</argLine>
Make also the necessary changes to the other plugin maven-failsafe-plugin and replace the following (again, notice the ${argLine}):
<argLine>-Xmx4096m -XX:MaxPermSize=512M ${itCoverageAgent}</argLine>
to
<argLine>${argLine} -Xmx4096m -XX:MaxPermSize=512M ${itCoverageAgent}</argLine>

I faced a bit of a different issue that returned the same error.
Skipping JaCoCo execution due to missing execution data /target/jacoco.exec
The truth is, this error is returned for many, many reasons.
We experimented with the different solutions on Stack Overflow, but found this resource to be best. It tears down the many different potential reasons why Jacoco could be returning the same error.
For us, the solution was to add a prepare-agent to the configuration.
<execution>
<id>default-prepare-agent</id>
<goals>
<goal>prepare-agent</goal>
</goals>
</execution>
I would imagine most users will be experiencing it for different reasons, so take a look at the aforementioned resource!

One can also get "Skipping JaCoCo execution due to missing execution data file" error due to missing tests in project. For example when you fire up new project and have no *Test.java files at all.

There might a case where some other argline setup or plugin in pom may be overriding jacoco execution order setup.
argLine set to -javaagent:/Users/davea/.m2/repository/org/jacoco/org.jacoco.agent/0.6.2.201302030002/org.jacoco.agent-0.6.2.201302030002-runtime.jar=destfile=/Users/davea/Dropbox/workspace/myproject/target/jacoco.exec
One of the example
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.16</version>
<configuration>
<forkCount>5</forkCount>
<reuseForks>true</reuseForks>
<argLine>-Dnet.sf.ehcache.disabled=true</argLine>
</configuration>
</plugin>
After getting rid of argLine from these plugins, jacoco started to work normally.

I know this question is pretty old but if someone like me comes here looking for an answer then this might help. I have been able to overcome the above error with this.
1) Remove the below piece of code from the plugin maven-surefire-plugin
<reuseForks>true</reuseForks>
<argLine>-Xmx2048m</argLine>
2) Add the below goal:
<execution>
<id>default-prepare-agent</id>
<goals>
<goal>prepare-agent</goal>
</goals>
</execution>

I've tried all answers but only the following combination of advice has worked for me. Why? I had very specific requirements:
JaCoCo generates report when build is run from command line: mvn clean verify (Maven 3.6.0)
Intellij IDEA (2019.01) runs my tests as well
It all works in presence of another javaagent defined in surefire plugin
Solution - prepend argLine value in surefire configuration with "late replacement" maven property #{...} as explained in surefire FAQ (my fixed configuration)
How do I use properties set by other plugins in argLine?
Maven does property replacement for
${...}
values in pom.xml before any plugin is run. So Surefire would never see the place-holders in its argLine property.
Since the Version 2.17 using an alternate syntax for these properties,
#{...}
allows late replacement of properties when the plugin is executed, so properties that have been modified by other plugins will be picked up correctly.
Failed first try - define jaCoCoArgLine property in prepare-agent goal configuration of jacoco - the scenario failed my second requirement, IntelliJ IDEA couldn't figure out agent for jmockit I use in the project for static method mocking

When using the maven-surefire-plugin or maven-failsafe-plugin you must not use a forkCount of 0 or set the forkMode to never as this would prevent the execution of the tests with the javaagent set and no coverage would be recorded.
ref: https://www.eclemma.org/jacoco/trunk/doc/maven.html
this is my gist

I was having the same issue. I updated the Jacoco version from 0.6 to 0.8 and updated surefire plugin as well. The following command generated Jacoco reports in site/jacoco/ folder:
mvn clean jacoco:prepare-agent install jacoco:report
My maven configurations are as follows:
<plugins>
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>0.8.6</version>
<executions>
<execution>
<goals>
<goal>prepare-agent</goal>
</goals>
</execution>
<execution>
<id>jacoco-report</id>
<phase>test</phase>
<goals>
<goal>report</goal>
</goals>
</execution>
<execution>
<id>jacoco-check</id>
<goals>
<goal>check</goal>
</goals>
<configuration>
<rules>
<rule>
<element>PACKAGE</element>
<limits>
<limit>
<counter>LINE</counter>
<value>COVEREDRATIO</value>
<minimum>0.0</minimum>
</limit>
</limits>
</rule>
</rules>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>3.0.0-M5</version>
<configuration>
<forkedProcessExitTimeoutInSeconds>60</forkedProcessExitTimeoutInSeconds>
<forkCount>1</forkCount>
</configuration>
</plugin>
</plugins>

Came accross the same problem just now.
I have a class named HelloWorld, and I created a test class for it named HelloWorldTests, then I got the output Skipping JaCoCo execution due to missing execution data file.
I then tried to change my pom.xml to make it work, but the attempt failed.
Finally, I simply rename HelloWorldTests to HelloWorldTest, and it worked!
So I guess that, by default, jacoco only recognizes test class named like XxxTest, which indicates that it's the test class for Xxx. So simply rename your test classes to this format should work!

FWhat tdrury said:
change your plugin configuration into this:
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>0.6.3.201306030806</version>
<executions>
<!-- prepare agent for measuring integration tests -->
<execution>
<id>prepare-integration-tests</id>
<phase>pre-integration-test</phase>
<goals>
<goal>prepare-agent</goal>
</goals>
<configuration>
<destFile>${basedir}/target/coverage-reports/jacoco-unit.exec</destFile>
</configuration>
</execution>
<execution>
<id>jacoco-site</id>
<phase>post-integration-test</phase>
<goals>
<goal>report</goal>
</goals>
<configuration>
<dataFile>${basedir}/target/coverage-reports/jacoco-unit.exec</dataFile>
</configuration>
</execution>
</executions>
</plugin>
Edit:
Just noticed one important thing, destFile and dataFile seems case sensitive so it's supposed to be destFile, not destfile.

I struggled for days. I tried all the different configurations suggested in this thread. None of them works. Finally, I find only the important configuration is the prepare-agent goal. But you have to put it in the right phase. I saw so many examples put it in the "pre-integration-test", that's a misleading, as it will only be executed after unit test. So the unit test won't be instrumented.
The right config should just use the default phase, (don't specify the phase explicitly). And usually, you don't need to mass around maven-surefire-plugin.
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>0.8.4</version>
<executions>
<execution>
<id>default-prepare-agent</id>
<goals>
<goal>prepare-agent</goal>
</goals>
</execution>
<execution>
<id>jacoco-site</id>
<phase>post-integration-test</phase>
<goals>
<goal>report</goal>
</goals>
</execution>
</executions>
</plugin>

Try to use:
mvn jacoco:report -debug
to see the details about your reporting process.
I configured my jacoco like this:
<configuration>
<dataFile>~/jacoco.exec</dataFile>
<outputDirectory>~/jacoco</outputDirectory>
</configuration>
Then mvn jacoco:report -debug shows it using the default configuration, which means jacoco.exec is not in ~/jacoco.exec. The error says missing execution data file.
So just use the default configuration:
<execution>
<id>default-report</id>
<goals>
</goals>
<configuration>
<dataFile>${project.build.directory}/jacoco.exec</dataFile>
<outputDirectory>${project.reporting.outputDirectory}/jacoco</outputDirectory>
</configuration>
</execution>
And everything works fine.

I know this is late, but just for anyone else who has this issue and nothing seems to fix it (like I had). Make sure that in you pom, your configuration for jacoco inside plugins is not in turn inside pluginManagement. It seems some sort of default for maven is to put the plugins inside pluginManagement. This is almost unnoticeable until you try to add detailed configurations like for jacoco. In order to add these, you need to add them outside of the pluginManagement, otherwise they are effectively ignored. See my poms below for details.
My old pom (that gave the "Skipping jacoco ..." message):
<project>
...
<build>
<pluginManagement>
<plugins>
...
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>0.8.2</version>
<executions>
<execution>
<id>default-prepare-agent</id>
<goals>
<goal>prepare-agent</goal>
</goals>
</execution>
<execution>
<id>default-report</id>
<phase>test</phase>
<goals>
<goal>report</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>
My new pom (that now compiles a working jacoco report):
<project>
...
<build>
<pluginManagement>
<plugins>
...
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>0.8.2</version>
</plugin>
</plugins>
</pluginManagement>
<plugins>
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<executions>
<execution>
<id>default-prepare-agent</id>
<goals>
<goal>prepare-agent</goal>
</goals>
</execution>
<execution>
<id>default-report</id>
<phase>test</phase>
<goals>
<goal>report</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>

It happens if the path of your project has blank spaces anywhere, such as:
/home/user/my projects/awesome project
the report is not generated. If that is the case, remove those spaces from directory names, such as:
/home/user/my-projects/awesome-project
or move the project to a directory that doesn't have spaces along the way.
About the plugin configuration, I just needed the basic as below:
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>0.8.5</version>
<executions>
<execution>
<id>jacoco-initialize</id>
<goals>
<goal>prepare-agent</goal>
</goals>
</execution>
<execution>
<id>jacoco-report</id>
<goals>
<goal>report</goal>
</goals>
</execution>
</executions>
</plugin>

Jacoco Execution data file is a jacoco.exec file which is generated when prepare agent goal is running. When It isn't generated or the correct path isn't set in configuration, you will get that error message. Because Jacoco use It to build test coverage. This usually occur when you use jacoco maven plugin and surfire or failsafe. To ensure that the jacoco.exec file is generated, you have to add argline in you pom.xml file, not in the surfire configuration but inside a properties tag in you pom.xml file.
<properties>
<argLine>-Xmx2048m</argLine>
</properties>

The execution says it's putting the jacoco data in /Users/davea/Dropbox/workspace/myproject/target/jacoco.exec but your maven configuration is looking for the data in ${basedir}/target/coverage-reports/jacoco-unit.exec.

I have added a Maven/Java project with 1 Domain class with the following features:
Unit or Integration testing with the plugins Surefire and Failsafe.
Findbugs.
Test coverage via Jacoco.
Where are the Jacoco results? After testing and running 'mvn clean', you can find the results in 'target/site/jacoco/index.html'. Open this file in the browser.
Enjoy!
I tried to keep the project as simple as possible. The project puts many suggestions from these posts together in an example project. Thank you, contributors!

My response is very late but for others users
In your case you have to configure failsafe pluging to use the command line agent configuration saved in itCoverageAgent variable.
For exemple
<configuration>
<argLine>${itCoverageAgent}</argLine>
</configuration>
In your maven configuration, jacoco prepare the command line arguments in prepare-agent phase, but failsafe plugin doesn't use it so there is no execution data file.

Sometimes the execution runs first time, and when we do maven clean install it doesn't generate after that.
The issue was using true for skipMain and skip properties
under maven-compiler-plugin of the main pom File.
Remove them if they were introduced as a part of any issue or suggestion.

In my case, the prepare agent had a different destFile in configuration, but accordingly the report had to be configured with a dataFile, but this configuration was missing. Once the dataFile was added, it started working fine.

I faced similar error because tests execution were skipped.
I ran my build with similar system parameter : -Dmaven.test.skip.exec=true
Turning this system parameter to false solved the issue.

I just removed following two lines from properties tag
<jacoco.ut.reportPath>${project.basedir}/../target/jacoco.exec</jacoco.ut.reportPath>
<sonar.jacoco.reportPaths>${project.basedir}/target/jacoco.exec</sonar.jacoco.reportPaths>
mvn install -Psonar by default creates jacoco.exec in target directory, so explicit path was not needed in my case.

For others that met similar problem, here is another possible solution:
Our project was running in a Traditional Chinese version of Windows, and when we checked prepare-agent section in maven log, we found that it tried to read the project folder which we put on desktop, through \桌面\...\project\... instead of \Desktop\...\project\.... I think UTF-8 symbol in paths make Jacoco go weird. We moved the project into other place and the issue was fixed.
TL;DR:
Check prepare-agent logs too as jacoco.exec was prepared during that.

2 Other Possibilities
JaCoCo's Maven plugin could be better integrated with Maven to provide more information about it's invocation and incorrect invocations. Nonetheless.
Possibility #1: Custom Arguments In Surefire plugin
Using JPMS module for my project with standard Maven directory layout, basic JSE 11 program, JUnit 5 & JaCoCo, with Eclipse and single module-info.java file (Eclipse 4.13 won't allow 2 module-info.java files in the project's root of the classpath). In order for Surefire to see my test cases I had to use the single <argLine> tag to allow Surefire to gain access using: --add-opens for all of the packages having unit tests:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.22.2</version>
<configuration>
<argLine>
#{argLine}
--add-opens module_name/com.myco.project=ALL-UNNAMED
--add-opens module_name/com.myco.project.more=ALL-UNNAMED
--add-opens module_name/com.myco.project.others=ALL-UNNAMED
</argline>
</configuration>
...
</plugin>
According to Jacoco documentation, you have to directly pass the Jacoco arguments to Surefire since specifying any Surefire arguments using <argLine> overrides Jacoco's defaults. Jacoco's online Maven documentation specifies using #{argLine} to pass Jacoco's arguments to Surefire (https://www.jacoco.org/jacoco/trunk/doc/prepare-agent-mojo.html).
Possibility #2: Intermingling Plugins
I also use the maven-javadoc plugin in my <reporting/> section. Incidentally, during the Javadoc reporting phase, it manages to invoke the prepare-agent goal of JaCoCo and gives the OP's error message shortly thereafter (according to maven debug, specifically while the maven-project-info-reports-plugin is configuring the reports to begin generating for maven site) - this despite the fact that my Test phase has already run and dumped a proper jacoco.exec file in the build output directory. It may be safe to ignore this warning, my JaCoCo report renders fine in my Maven Site. However, if you're seeing it during the execution of a JaCoCo goal, it probably shouldn't be ignored.
Tips
If you're having doubts about the file getting created, watch the directory where the file is supposed to appear during the build. Generating the file is a fairly slow process. See my other answer here: https://stackoverflow.com/a/75465187/2336934
Do your best to keep to all the defaults as much as possible, simpler is better.

Multi-module maven jacoco setup for integration tests

I have maven setup with multiple modules, the setup looks something like this
root module
- domain module
- repository module
- service module
- controllers module
Jacoco is correctly generating test coverage from unit tests and sonar is showing the correct percentage (let's say 20%). Surefire is used for unit tests.
For integration tests its more tricky, we use failsafe and integration tests generate jacoco-it.exec file which is scanned by sonar. My problem is that integration tests are located in the controllers module and it only shows test coverage of integration tests on classes that are inside controllers and not on classes that are in another module like service module. Because of this overall test coverage with integration tests increases to something like 21% instead of 35+%.
Is it possible to configure sonar and jacoco to measure test coverage with the integration tests of all classes instead of classes from same module only, if integration tests are in controllers module?
For reference, this is the relevant setup
<sonar.java.coveragePlugin>jacoco</sonar.java.coveragePlugin>
<sonar.dynamicAnalysis>reuseReports</sonar.dynamicAnalysis>
...
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>0.7.9</version>
<executions>
<execution>
<id>pre-unit-test</id>
<goals>
<goal>prepare-agent</goal>
</goals>
<configuration>
<destFile>${project.build.directory}/jacoco.exec</destFile>
<propertyName>surefireArgLine</propertyName>
</configuration>
</execution>
<execution>
<id>pre-integration-test</id>
<phase>pre-integration-test</phase>
<goals>
<goal>prepare-agent</goal>
</goals>
<configuration>
<destFile>${project.build.directory}/jacoco-it.exec</destFile>
<propertyName>failsafeArgLine</propertyName>
</configuration>
</execution>
</executions>
</plugin>
I run my tests with mvn verify and scanner with mvn sonar:sonar

You can aggregate your coverage reports by writing them all to the same destination file.
For example, we're only covering unit tests in our multi-module projects at the moment, so our parent pom contains:
<properties>
...
<sonar.jacoco.reportPath>${project.basedir}/../target/jacoco.exec</sonar.jacoco.reportPath>
...
</properties>
and
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<configuration>
<destFile>${sonar.jacoco.reportPath}</destFile>
<append>true</append>
</configuration>
<inherited>true</inherited>
<executions>
<execution>
<goals>
<goal>prepare-agent</goal>
</goals>
</execution>
</executions>
</plugin>
This results in a single aggregated report for all modules.
I expect that a similar pattern could be applied to your jacoco IT configuration.

Aggregated Coverage or Coverage in the dependent modules not shown in SonarQube + Reports are generated by Jacoco

I am running jacoco plugin to generate html , xml and jacoco.exec reports to measure the coverage of the code tested by my testNg tests.
I am successful in the generation of these reports in my local as well as in Jenkins and all my unit test results are reflected in Sonar and it's showing me the coverage.
My jacoco.exec has both results of the coverage in the module and the dependent modules. I have verified this using eclemma plugin for eclipse.
I am not getting the coverage results in the dependent modules in Sonar.Does any one what I am doing wrong.
My plugin goes like this
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>0.7.7.201606060606</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>
and my goal is jacoco:report-aggregate

I got the answer from jacoco plugin coverage in multi-module
The following were the mistakes that I did which caused problem form me. In the properties of our pom
<sonar.jacoco.reportPath>${project.basedir}/../target/jacoco.exec</sonar.jacoco.reportPath>
and in plugin
<destFile>${sonar.jacoco.reportPath}</destFile>
for me, the above statement flushed the jacoco.exec in different folders because of difference in maven module hierarchy as a result they never agrregated.
The second point is that the dependent module coverage will be only obtained only if it is a compile time dependency to the testing module.

Get correct coverage in sonar for unit and integration tests in separate maven modules

My project setup is simple (all source available at github):
parent
↳ backend
↳ client
↳ integration-tests
And after runing maven:
mci sonar:sonar -Dsonar.host.url=http://localhost:9000 -Dsonar.login=12...9
I see that unit and integration tests are visible for sonar, but coverage from IT is not.
For Intelij IDEA jacoco-it.exec looks fine:
I'm assuming that culprit is here:
[INFO] Sensor JaCoCoSensor [java]
[INFO] No JaCoCo analysis of project coverage can be done since there is no class files.
[INFO] Sensor JaCoCoSensor [java] (done) | time=1ms
So I did small hack (in short: copied all source files to integration-test module):
<properties>
<sonar.sources>${basedir}/target/copied</sonar.sources>
</properties>
[...]
<!-- hack to generate coverage reports -->
<plugin>
<artifactId>maven-resources-plugin</artifactId>
<version>${maven-resources-plugin.version}</version>
<executions>
<execution>
<id>copy-resources</id>
<phase>generate-sources</phase>
<goals>
<goal>copy-resources</goal>
</goals>
<configuration>
<outputDirectory>${sonar.sources}</outputDirectory>
<resources>
<resource>
<directory>${basedir}/../backend/src/main/java</directory>
<filtering>false</filtering>
</resource>
</resources>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>build-helper-maven-plugin</artifactId>
<executions>
<execution>
<phase>generate-sources</phase>
<goals>
<goal>add-source</goal>
</goals>
<configuration>
<sources>
<source>${sonar.sources}</source>
</sources>
</configuration>
</execution>
</executions>
</plugin>
But now all my classes ale duplicated (sonar shows also classes from ../target/copied dir):
Sonar version: 6.5
Jacoco maven plugin: 0.7.5.201505241946 (also tried lastest 0.7.9)
Any ideas what should I do here?

Looks like I have answer for that question:
Report wasn't generated because post-unit-test execution was in the wrong phase. Instead of <phase>test</phase> I now have <phase>verify</phase>
I had a wrong goal for post-integration-test. The change was from <goal>report-integration</goal> to <goal>report-aggregate</goal>:
This goal allows me to create coverage reports when tests are in separate projects from the code under test.
Added properties:
<jacoco.itReportPath>${project.basedir}/../integrations-tests/target/jacoco-it.exec</jacoco.itReportPath> and
<sonar.jacoco.reportPaths>${jacoco.itReportPath},${project.build.directory}/jacoco-it.exec,${project.build.directory}/jacoco.exec</sonar.jacoco.reportPaths>
All those chages and update project available on github

I use mainly jacoco for coverage. You need to have a few things in place before you start
Enable and configure surefire plugin
Enable and configure the jacoco plugin
It's a one time configuration that you will build and forget, one of my projects serving as parent enables this feature. Feel free to check it out:
https://github.com/slixes/parent/blob/master/pom.xml