How to check code coverage with JaCoCo agent?
user3450486
I am going to deploy application with JaCoCo agent to production environment to let it work for some time. The result should help me identify the parts of code I can get rid of.
I started some research around the topic and prepared HelloWorld application:
public class HelloWorld {
public static void main(String[] args) {
System.out.println("Hello world");
}
}
Then I compiled the class: "javac HelloWorld.java" and got HelloWorld.class file.
Now I run the app with the following command: "java -javaagent:jacocoagent.jar HelloWorld" the program executes and jacoco binary is generated. The file contains some binary data.
Everything looks fine but the coverage report shows 0% coverage although it should be 100%.
Has anyone faced this issue or correct me what I am doing the bad way?
bhdrkn
I generated full report using this steps. Since I use maven for this kind of operations I added maven after your steps. I created HelloWorld.java just copying from your question. Then I follow these steps:
javac HelloWorld.java which outputs HelloWorld.class Then I created jacoco.exec by executing java -javaagent:jacocoagent.jar HelloWorld
Then I created a pom.xml file which contents are like this.
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>test</groupId>
<artifactId>test</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>pom</packaging>
<name>test</name>
<build>
<plugins>
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>0.7.5.201505241946</version>
</plugin>
</plugins>
</build>
After that I created a target/classes directory. I copied jacoco.exec to target/ and HelloWorld.class to target/classes.
Then I executed mvn jacoco:report which generates a report to target/site/jacoco. Which contains correct coverage information.
I know using maven may not sound good for a simple application. But I don't know any other way to generate reports from jacoco.exec. By the way your maven plugin version and jacocoagent version must match.
And here the result I get.
Collected from the Internet
Please contact [email protected] to delete if infringement.
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