• 1). Add jacoco-maven-plugin and maven-surefire-plugin plugin to your pom.xml file, see here
• 2). Call mvn clean package during your CI tests, see here
• 3). Call bash <(curl -s https://codecov.io/bash) at the end of your CI build, see here

• login https://travis-ci.org/ and add lovepoem/codecov-travis-maven-junit5-example repository to https://travis-ci.org/
• login https://codecov.io/ and add lovepoem/codecov-travis-maven-junit5-example repository to https://codecov.io/

Use jacoco-maven-plugin plugin version 0.8.2 to collect test coverage without codecov token ,need jdk version: java8+

So if you ues a lower jdk version , please see this repo : https://github.com/lovepoem/codecov-travis-maven-junit4-example