how to create a jacoco.exec by executing standalone junit against a java jar application

[joysha...@gmail.com]

hi, i have created a customerorder application(not a web application) and packaged it in main.jar.

I want to use the jacoco CLI introduced in 0.8 version..

Step 1. I created the instrumented classes by executing
java -jar jacococli.jar instrument <dir where all my application are> --dest C:\jacoco\target
here, C:\jacoco\target is the directory where the instrumented classes will placed.

Step2: I ran my junit test class as standalone application::
java -cp ${CLASSPATH} org.junit.runner.JUnitCore com.samples.customerinfo.CustomerOrderInfoTest

Junit sucessfull done!!

Step3:: Missing link.. How my executed junit will create the jacoco.exec files, i want to use the CLI options of jacoco library..

do i need to pass the jacocoagent.jar in the JVM , i am using powershell only.

Pl. suggest..

[joysha...@gmail.com]

Hi All,
I found the reply..
Step 2 needs to be changed and javaagent options needs to added and pointing to jacocoagent.jar

java -javaagent:jacocoagent.jar=destfile=jacoco.exec -cp ${CLASSPATH} org.junit.runner.JUnitCore com.samples.customerinfo.CustomerOrderInfoTest

[Evgeny Mandrikov]

If you use agent, then you don't need to instrument classes in step 1.

[joysha...@gmail.com]

ok.. so is there any other way to create the jacoco.exec file if i am not using jacocagent while executing the junit from command line..

[Evgeny Mandrikov]

On Monday, October 29, 2018 at 10:41:02 AM UTC+1, joysha...@gmail.com wrote:

ok.. so is there any other way to create the jacoco.exec file if i am not using jacocagent while executing the junit from command line..

Execution of JUnit with coverage is not different from execution of any other Java application with coverage, so for simplicity I will demonstrate last one.

Given "src/Example.java":

class Example {

  public static void main(String[] args) {

    System.out.println("Hello, World!");

  }

}

Compile:

$ mkdir classes

$ javac -g src/Example.java -d classes

Then you have two distinct options.

First and recommended - on-the-fly instrumentation with agent:

$ java -cp classes -javaagent:jacoco-0.8.2/lib/jacocoagent.jar Example

Hello, World!

Second - offline pre-instrumentation without agent:

$ java -jar jacoco-0.8.2/lib/jacococli.jar instrument classes --dest instrumented

[INFO] 1 classes instrumented to /private/tmp/example/instrumented.

$ java -cp instrumented:jacoco-0.8.2/lib/jacocoagent.jar Example

Hello, World!

In both cases by default "jacoco.exec" is created in current directory.

About customizations please read:

https://www.jacoco.org/jacoco/trunk/doc/agent.html

or

https://www.jacoco.org/jacoco/trunk/doc/offline.html

respectively.

Generation of report using CLI:

$ java -jar jacoco-0.8.2/lib/jacococli.jar report jacoco.exec --classfiles classes --sourcefiles src --html report

[INFO] Loading execution data file /private/tmp/example/jacoco.exec.

[INFO] Analyzing 1 classes.

[joysha...@gmail.com]

Thank you so much.. If this is added in jacoco CLI documentation, it would be very helpful !!