Maven JaCoCo plugin error

Question

I have configured the Maven JaCoCo plugin as follows in my pom.xml file:

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <jacoco.version>0.5.9.201207300726</jacoco.version>
</properties>

<profiles>
    <profile>
        <id>jacoco4</id>
        <build>
            <plugins>
                <plugin>
                    <groupId>org.jacoco</groupId>
                    <artifactId>jacoco-maven-plugin</artifactId>
                    <version>${jacoco.version}</version>
                    <executions>
                        <execution>
                            <goals>
                                <goal>prepare-agent</goal>
                            </goals>
                            <configuration
                            <destfile>${project.build.directory}/target/jacoco.exec</destfile>
                            <datafile>${project.build.directory}/target/jacoco.exec</datafile>
                                <output>file</output>
                                <append>true</append>
                            </configuration>
                        </execution>
                        <execution>
                            <id>report</id>
                            <phase>prepare-package</phase>
                            <goals>
                                <goal>report</goal>
                            </goals>
                        </execution>
                    </executions>
                </plugin>
            </plugins>
        </build>
    </profile>
</profiles>

I'm using Windows 7 and the apache-maven-3.0.4 plugin. When I type mvn -P jacoco4 install, either from a cygwin terminal or from a command prompt terminal, Maven downloads and runs the JaCoCo plugin, but then the jacoco.exec file doesn't appear to have been created. Below is the error message:

[ERROR] Unable to read execution data file C:\Users\brownru\workspace64new\vps9\vps-fileserver\target\jacoco.exec: C:\Users\brownru\workspace64new\vps9\vps-fileserver\target\jacoco.exec (The system cannot find the file specified)
java.io.FileNotFoundException: C:\Users\brownru\workspace64new\vps9\vps-fileserver\target\jacoco.exec (The system cannot find the file specified)
        at java.io.FileInputStream.open(Native Method)
        at java.io.FileInputStream.<init>(FileInputStream.java:120)
        at org.jacoco.maven.ReportMojo.loadExecutionData(ReportMojo.java:251)
        at org.jacoco.maven.ReportMojo.executeReport(ReportMojo.java:228)
        at org.jacoco.maven.ReportMojo.execute(ReportMojo.java:217)
        at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
        at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
        at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
        at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
        at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
        at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
        at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
        at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)

This error message appears whether or not I include the destfile and datafile specifiers in the configuration of the plugin:

<destfile>${project.build.directory}/target/jacoco.exec</destfile>
<datafile>${project.build.directory}/target/jacoco.exec</datafile>

Can someone please tell me what I'm doing wrong?

Answer 1

I had the same trouble with jacoco and maven. It was related to a parent pom overwriting the configuration of surefire. In this case, that plugin didn't used the argument (for jvm argument) defining the agent.

The solution was to put the "argLine" configuration element back

<plugin>
  <artifactId>maven-surefire-plugin</artifactId>
  <configuration>
   <argLine>${argLine}</argLine>
  </configuration>
 </plugin>

Full plugin conf looks like

<plugin>
  <artifactId>maven-surefire-plugin</artifactId>
  <configuration>
    <skip>true</skip>
  </configuration>
  <executions>
    <execution>
      <id>unit-test</id>
      <phase>test</phase>
      <goals>
        <goal>test</goal>
      </goals>
      <configuration>
        <skip>${maven.test.skip}</skip>
        <argLine>${argLine}</argLine>
        <excludes>
          <exclude>**/*IntegrationTest.java</exclude>
        </excludes>
      </configuration>
    </execution>
    <execution>
      <id>integration-test</id>
      <phase>integration-test</phase>
      <goals>
        <goal>test</goal>
      </goals>
      <configuration>
        <skip>${skipITs}</skip>
        <argLine>${argLine}</argLine>
        <includes>
          <include>**/*IntegrationTest.java</include>
        </includes>
      </configuration>
    </execution>
  </executions>
</plugin>
<plugin>
    <groupId>org.jacoco</groupId>
    <artifactId>jacoco-maven-plugin</artifactId>
    <version>0.5.10.201208310627</version>
    <configuration>
        <skip>${maven.test.skip}</skip>
        <destFile>${basedir}/target/coverage-reports/jacoco-unit.exec</destFile>
        <dataFile>${basedir}/target/coverage-reports/jacoco-unit.exec</dataFile>
        <output>file</output>
        <append>true</append>
    </configuration>
    <executions>
        <execution>
            <id>jacoco-initialize</id>
            <goals>
                <goal>prepare-agent</goal>
            </goals>
        </execution>
        <execution>
            <id>jacoco-site</id>
            <phase>verify</phase>
            <goals>
                <goal>report</goal>
            </goals>
        </execution>
    </executions>
</plugin>

Hope it'll be usefull