Gradle JaCoCo – Incompatible version 1006

A Gradle build + JaCoCo coverage report.

build.gradle

    apply plugin: 'java'
    apply plugin: 'eclipse-wtp'
    apply plugin: 'jacoco' //code coverage

    repositories {
        mavenLocal()
        mavenCentral()
    }

    jacoco {
        toolVersion = "0.7.5+"
    }

    jacocoTestReport {
     reports {
    html.enabled = true
    xml.enabled = true
    csv.enabled = false
     }
 }


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P.S Tested with Gradle 2.10

1. Problem

1.1 Run the jacocoTestReport task and hits the following error message :

$ gradle jacocoTestReport


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Output

* What went wrong:
Execution failed for task ':jacocoTestReport'.
> Unable to read execution data file /home/mkyong/workspace/hc/analyzer/build/jacoco/test.exec

1.2 Get more info with --stacktrace option.

$ gradle jacocoTestReport --stacktrace


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Output – java.io.IOException: Incompatible version 1006.

Caused by: : Unable to read execution data file /home/mkyong/workspace/hc/analyzer/build/jacoco/test.exec
 at org.jacoco.ant.ReportTask.loadExecutionData(ReportTask.java:516)
 at org.jacoco.ant.ReportTask.execute(ReportTask.java:490)
 at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)
 at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
 at org.gradle.api.internal.project.ant.BasicAntBuilder.nodeCompleted(BasicAntBuilder.java:78)
 //...
Caused by: java.io.IOException: Incompatible version 1006.
 at org.jacoco.core.data.ExecutionDataReader.readHeader(ExecutionDataReader.java:127)
 at org.jacoco.core.data.ExecutionDataReader.readBlock(ExecutionDataReader.java:107)
 at org.jacoco.core.data.ExecutionDataReader.read(ExecutionDataReader.java:87)
 at org.jacoco.core.tools.ExecFileLoader.load(ExecFileLoader.java:59)
 at org.jacoco.ant.ReportTask.loadExecutionData(ReportTask.java:514)

2. Solution

Look like Gradle JaCoCo plugin is not compatible with JaCoCo 0.7.5, to fix it, downgrade JaCoCo to version 0.7.4+

build.gradle

    jacoco {
        toolVersion = "0.7.4+"
    }


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For similar “Incompatible version 100x” error, try downgrading or upgrade the JaCoCo version.