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I had same problem using maven cobertura plugin. All tests failed when run from cobertura:report. But all tests succeeded when run directly from surefire plugin. As some of you already said the problem is that coberture byte code instrumentation of is not compatible with JDK7.

So my solution is to configure surefire-plugin to always execute the tests with JVM arg "-XX:-UseSplitVerifier. It works well with and without cobertura instrumentation.

My surefire configuration in maven:

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-surefire-plugin</artifactId>
    <version>2.12</version>
    <configuration>
        <argLine>-XX:-UseSplitVerifier</argLine>
    </configuration>
</plugin>

Does this work for ant based project as well?

@dkantowitz You are genius! It works perfectly in Eclipse. Why bother all the time with Surefire, if you can see all the results in your code editor in Eclipse? You should have made your post as a top-level one, because it is really, really helpful. Also it worth mentioning that before using Cobertura in Kepler you must follow these steps: stackoverflow.com/questions/18630141/

@nucleo Thanks for the kind words. I'm glad my note assisted you. I honestly don't even remember writing the comment or the what I was doing at the time. The whole thing was probably one of those get-through-it / fix-stupid-java-crap things one deals with and promptly forgets ; didn't seem worth more than a quick comment at the time.

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IntelliJ IDEA 11's internal coverage tool works fine for my project using try-with-resources, diamond operator but we are not using invokedynamic. I think the coverage tool is not included in the community edition, ultimate only.

I have yet to try jacoco - it's where most of emma's former developers seem to have gone.

JaCoCo looks perfectly and in comparison to other tools it does not use instrumentation like byte code instrumentation (Emma, Cobertura) nor source code instrumentation (Clover). I do not know the details but it looks like it reuses the debug information and works as Java agent, which simplifies lots of task during the build.

In fact JaCoCo performs byte code instrumentation, but in contrast with Emma and Cobertura - on-the-fly.

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I got Gradle 1.0M9, Java 7 and EMMA 2.1 working with the patches suggested here: using the jvm argument.

configurations{
  emma
}

dependencies {
  // EMMS Code Coverage
  emma "emma:emma:2.1.5320"
  emma "emma:emma_ant:2.1.5320"
  ...
  testCompile group: 'junit', name: 'junit', version: '4.9'
}

test {
    // add EMMA related JVM args to our tests
  jvmArgs "-XX:-UseSplitVerifier", "-Demma.coverage.out.file=$buildDir/tmp/emma/metadata.emma", "-Demma.coverage.out.merge=true"

    doFirst {
   println "Instrumenting the classes at " + sourceSets.main.output.classesDir.absolutePath
   // define the custom EMMA ant tasks
   ant.taskdef( resource:"emma_ant.properties", classpath: configurations.emma.asPath)

       ant.path(id:"run.classpath") {
    pathelement(location:sourceSets.main.output.classesDir.absolutePath)
   }
   def emmaInstDir = new File(sourceSets.main.output.classesDir.parentFile.parentFile, "tmp/emma/instr")
   emmaInstDir.mkdirs()
   println "Creating $emmaInstDir to instrument from " +   sourceSets.main.output.classesDir.absolutePath
   // instruct our compiled classes and store them at $buildDir/tmp/emma/instr
   ant.emma(enabled: 'true', verbosity:'info'){
    instr(merge:"true", destdir: emmaInstDir.absolutePath, instrpathref:"run.classpath",
      metadatafile: new File(emmaInstDir, '/metadata.emma').absolutePath) {
     instrpath {
     fileset(dir:sourceSets.main.output.classesDir.absolutePath, includes:"**/*.class")
     }
    }
   }
   setClasspath(files("$buildDir/tmp/emma/instr") + configurations.emma +  getClasspath())
  }

    // The report should be generated directly after the tests are done.
  // We create three types (txt, html, xml) of reports here. Running your build script now should
  // result in output like that:
  doLast {
   def srcDir = sourceSets.main.java.srcDirs.toArray()[0]
   println "Creating test coverage reports for classes " + srcDir
   def emmaInstDir = new File(sourceSets.main.output.classesDir.parentFile.parentFile, "tmp/emma")
   ant.emma(enabled:"true"){
    new File("$buildDir/reports/emma").mkdirs()
    report(sourcepath: srcDir){
     fileset(dir: emmaInstDir.absolutePath){
      include(name:"**/*.emma")
     }
     txt(outfile:"$buildDir/reports/emma/coverage.txt")
     html(outfile:"$buildDir/reports/emma/coverage.html")
     xml(outfile:"$buildDir/reports/emma/coverage.xml")
    }
   }
   println "Test coverage reports available at $buildDir/reports/emma."
   println "txt: $buildDir/reports/emma/coverage.txt"
   println "Test $buildDir/reports/emma/coverage.html"
   println "Test $buildDir/reports/emma/coverage.xml"
    }
}

Running "gradle test" gives the following:

marcello@hawaii:/u1/development/workspaces/open-source/interviews/vmware$ gradle test
:compileJava
:processResources UP-TO-DATE
:classes
:compileTestJava
:processTestResources UP-TO-DATE
:testClasses
:test
Instrumenting the classes at /u1/development/workspaces/open-source/interviews/vmware/build/classes/main
Creating /u1/development/workspaces/open-source/interviews/vmware/build/tmp/emma/instr to instrument from /u1/development/workspaces/open-source/interviews/vmware/build/classes/main
Creating test coverage reports for classes /u1/development/workspaces/open-source/interviews/vmware/src/main/java
Test coverage reports available at /u1/development/workspaces/open-source/interviews/vmware/build/reports/emma.
txt: /u1/development/workspaces/open-source/interviews/vmware/build/reports/emma/coverage.txt
Test /u1/development/workspaces/open-source/interviews/vmware/build/reports/emma/coverage.html
Test /u1/development/workspaces/open-source/interviews/vmware/build/reports/emma/coverage.xml

BUILD SUCCESSFUL

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Emma works if you do not use new language features (like try-with-resources, etc.). You can use Java 7 using new libraries (Paths, DirectoryStream, etc.). I know this would be not a solution to your problem, but if you want to only check "how JDK 7 performs" it may work...

After switching to Java 7 I did a refactoring to my old code, so indeed going back is not an option, but thanks for the hint. Because of the fact that my code complies to the newest version of Java I was not able to check if it still does work with Java 6 syntax.

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I had the same issue. Fortunately beta works with JDK 7. Update site link: http://download.eclipselab.org/eclemma/beta/2.0.0/update/ This link should be used in Eclipse:

Help -> Install new software... -> Add...

After clicking on the link you have provided I got the xml response Access Denied. However by the content of the link I can tell this is an emma Eclipse plugin. Do you run it as an Ant task as well? The Ant task is the thing I need most.

Ok, already figured it out. I should use it in the Eclipse "Install New Software..."

The hint you had given me, led me to the JaCoCo: eclemma.org/jacoco/trunk/index.html which for me works perfectly and covers all my requirements. Therefore I am accepting this answer.

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java 7 - Testng, Emma, Cobertura, coverage and JDK 7 result in ClassFo...

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I was having this problem. Upgrading to 2.0.1.201112281951 using the Eclipse marketplace worked for me.

java 7 - Testng, Emma, Cobertura, coverage and JDK 7 result in ClassFo...

code-coverage java-7 cobertura emma jacoco