Travis build stucks on jacoco -

this travis.yml

language: java  sudo: required  jdk:   - oraclejdk8  install: true  script:   - sudo apt-get update && sudo apt-get install oracle-java8-installer   - java -version  after_success: - ./gradlew test jacocotestreport coveralls 

and travis output:

[...] :processtestresources :testclasses :test download https://repo1.maven.org/maven2/org/jacoco/org.jacoco.agent/0.7.5.201505241946/org.jacoco.agent-0.7.5.201505241946.pom download https://repo1.maven.org/maven2/org/jacoco/org.jacoco.build/0.7.5.201505241946/org.jacoco.build-0.7.5.201505241946.pom download https://repo1.maven.org/maven2/org/jacoco/org.jacoco.agent/0.7.5.201505241946/org.jacoco.agent-0.7.5.201505241946.jar no output has been received in last 10 minutes, potentially indicates stalled build or wrong build itself. build has been terminated 

i have no idea why , how can debug :\ hints? works on machine.

it turned out has nothing jacoco. i'm using javafx testfx and, of course, needs frame buffer. works after enabling xvfb:

before_install:   - "export display=:99.0"   - "sh -e /etc/init.d/xvfb start"