JaCoCo Can't add different class with same name: org/hamcrest/BaseDescription

user_1086117 0
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Hi I'm hitting the following exception when running a JaCoCo coverage:

    <plugin>
        <groupId>org.jacoco</groupId>
        <artifactId>jacoco-maven-plugin</artifactId>
        <version>0.5.8.201207111220</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>

Error while creating report: Can't add different class with same name: org/hamcrest/BaseDescription
java.lang.IllegalStateException: Can't add different class with same name: org/hamcrest/BaseDescription
    at org.jacoco.core.analysis.CoverageBuilder.visitCoverage(CoverageBuilder.java:89)
    at org.jacoco.core.analysis.Analyzer$1.visitEnd(Analyzer.java:79)
    at org.objectweb.asm.ClassAdapter.visitEnd(Unknown Source)
    at org.jacoco.core.internal.flow.ClassProbesAdapter.visitEnd(ClassProbesAdapter.java:128)
    at org.objectweb.asm.ClassReader.accept(Unknown Source)
    at org.objectweb.asm.ClassReader.accept(Unknown Source)
    at org.jacoco.core.analysis.Analyzer.analyzeClass(Analyzer.java:94)
    at org.jacoco.core.analysis.Analyzer.analyzeClass(Analyzer.java:115)
    at org.jacoco.core.analysis.Analyzer.analyzeAll(Analyzer.java:155)
    at org.jacoco.core.analysis.Analyzer.analyzeArchive(Analyzer.java:135)
    at org.jacoco.core.analysis.Analyzer.analyzeAll(Analyzer.java:158)
    at org.jacoco.core.analysis.Analyzer.analyzeAll(Analyzer.java:183)
    at org.jacoco.maven.ReportMojo.createBundle(ReportMojo.java:280)
    at org.jacoco.maven.ReportMojo.createReport(ReportMojo.java:256)
    at org.jacoco.maven.ReportMojo.executeReport(ReportMojo.java:230)
    at org.jacoco.maven.ReportMojo.execute(ReportMojo.java:208)
    at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:490)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:694)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalWithLifecycle(DefaultLifecycleExecutor.java:556)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:535)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:387)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:348)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:180)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:328)
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:138)
    at org.apache.maven.cli.MavenCli.main(MavenCli.java:362)
    at org.apache.maven.cli.compat.CompatibleMain.main(CompatibleMain.java:60)
    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.classworlds.Launcher.launchEnhanced(Launcher.java:315)
    at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
    at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
    at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
jacoco
5 Answers

Certain jars or project files in the target-folder usually cause this issue. This is what solved the problem in our maven project (see Sanjay's answer for gradle):

        <plugin>
            <groupId>org.jacoco</groupId>
            <artifactId>jacoco-maven-plugin</artifactId>
            <version>0.8.7</version>
            <configuration>
                <excludes>**/*.jar</excludes>
            </configuration>
        </plugin>

Note that this is the simplest solution working for our specific project. If you need to make additional exclusions, wrap multiple <exclude>-commands as follows:

            <configuration>
                <excludes>
                    <exclude>**/*.jar</exclude>
                    <exclude>naughty-dependency/**/*.class</exclude>
                </excludes>
            </configuration>

N.B. this configuration section doesn't attach JaCoCo to any <execution>-goals on purpose. This way the default packaging process won't break when JaCoCo falls over and also runs slightly faster. Reports will only be generated when issuing mvn org.jacoco:jacoco-maven-plugin:prepare-agent test jacoco:report, which we do in our gitlab CI-pipeline for instance.

user_12465470

In my case the issues was happening due to class in project Jar artefact.

    Caused by: java.io.IOException: Error while analyzing /opt/jenkins/workspace/MicroService-M_build/microservice/dev/microservice/build/gen/main/resources/uploadassets/myCustomProject.jar@org/apache/commons/beanutils/BasicDynaBean.class.
Caused by: java.lang.IllegalStateException: Can't add different class with same name: org/apache/commons/beanutils/BasicDynaBean
    at org.jacoco.core.analysis.CoverageBuilder.visitCoverage(CoverageBuilder.java:107)

Below is the gradle taks to exclude the custom jar from jacoco test report

jacocoTestReport {
        doFirst {
            delete fileTree (dir: "${buildDir}/gen/main/resources/uploadassets", include: "myCustomProject.jar")
        }
        reports {
            xml.enabled true
        }
    }

This solved my issue.

user_15031630
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