JaCoCo with Maven - missing execution data file

问题

We have a Maven multi module project consisting of a parent (HelloWorld) and different children (HelloWorldServices and HelloWorldPresentation) and use Jenkins to build.

The error after running the successful test is

[INFO] --- jacoco-maven-plugin:0.7.6.201602180812:report (default-cli) @ HelloWorldServices ---
[INFO] Skipping JaCoCo execution due to missing execution data file:/var/lib/jenkins/workspace/HelloWorld/HelloWorldServices/target/jacoco.exec

The lines before it says

[INFO] --- jacoco-maven-plugin:0.7.6.201602180812:prepare-agent (default-cli) @ HelloWorldServices ---
[INFO] argLine set to -javaagent:/var/lib/jenkins/.m2/repository/org/jacoco/org.jacoco.agent/0.7.6.201602180812/org.jacoco.agent-0.7.6.201602180812-runtime.jar=destfile=/var/lib/jenkins/workspace/HelloWorld/HelloWorldServices/target/jacoco.exec

This is how I defined the parent pom JaCoCo plugin:

<plugin>
    <groupId>org.jacoco</groupId>
    <artifactId>jacoco-maven-plugin</artifactId>
    <version>0.7.6.201602180812</version>
    <configuration>
        <destfile>${project.artifactId}/target/jacoco.exec</destfile>
        <datafile>${project.artifactId}/target/jacoco.exec</datafile>
    </configuration>

    <executions>
        <execution>
            <id>jacoco-initialize</id>
            <goals>
                <goal>prepare-agent</goal>
            </goals>
        </execution>
        <execution>
            <id>jacoco-site</id>
            <phase>package</phase>
            <goals>
                <goal>report</goal>
            </goals>
        </execution>
    </executions>
</plugin>

In no pom did I explicitly mention surefire. I also tried what you find everywhere to put the argLine in the configuration but all with the same result. The JaCoCo .exec file has never been created, no matter what I do. As for the goals, I use

mvn clean install jacoco:prepare-agent jacoco:report

Since when I omit the jacoco goals, it doesn't even display the INFO message.

回答1:

You should not invoke the agent after the install phase but before, so instead of invoking:

mvn clean install jacoco:prepare-agent jacoco:report

You should invoke

mvn clean jacoco:prepare-agent install jacoco:report

The main reason is: the agent will not participate to the build lifecycle, the test phase will already be executed as part of the install phase, then Maven will execute the agent as per command line invocation, but it will be too late.

You should probably also change the plugin configuration above to:

<plugin>
    <groupId>org.jacoco</groupId>
    <artifactId>jacoco-maven-plugin</artifactId>
    <version>0.7.6.201602180812</version>
    <executions>
        <execution>
            <id>jacoco-initialize</id>
            <goals>
                <goal>prepare-agent</goal>
            </goals>
        </execution>
        <execution>
            <id>jacoco-site</id>
            <phase>package</phase>
            <goals>
                <goal>report</goal>
            </goals>
        </execution>
    </executions>
</plugin>

Note: I removed the configuration section, because it was actually pointing to default values. Moreover, XML elements are case sensitives here, so your datafile element was simply ignored, it should have been dataFile instead. The same applies to destFile.

The prepare-agent goal is already using ${project.build.directory}/jacoco.exec as default destFile value, the same applied to the dataFile value for the report goal. The main reason for this change would be a more flexible and standard build, not relying on artifactId as project name (the default, but still not mandatory) and using the more generic ${project.build.directory} property instead to point directly at target.

Final note: make sure to configure the Jacoco Plugin executions within the build/plugins section and not build/pluginManagement/plugins section. The pluginManagement section is meant for governance and common harmonization of versions or configurations, but it will be ignored if the corresponding plugin would not be declared under build/plugins.
As per official Maven POM reference

pluginManagement: is an element that is seen along side plugins. Plugin Management contains plugin elements in much the same way, except that rather than configuring plugin information for this particular project build, it is intended to configure project builds that inherit from this one. However, this only configures plugins that are actually referenced within the plugins element in the children. The children have every right to override pluginManagement definitions.

(note: bold is mine)

回答2:

I think that "destfile" and "datafile" are case sensitive so try to replace them with "destFile" and "dataFile", maybe it'll work :)

回答3:

JaCoCo reports get created from execution data file.
If this file is not present then JaCoCo report goal skips report creation.
So it is compulsory to create execution data file.

Reasons due to which execution data file will not get created are as follows.
- Tests are not present.
- All tests are ignored.
- Surefire plugin is missing.
- JaCoCo's prepare-agent goal is not executed, which set argLine which is needs to configure to surefire.
- Surefire plugin is not configured with JaCoCo's agent.

来源：https://stackoverflow.com/questions/36304793/jacoco-with-maven-missing-execution-data-file

标签

java

maven

maven-3

pom.xml

jacoco-maven-plugin