I fixed the problem using the follwing travis configuration
- name: sonarqube
language: java
before_install:- wget https://binaries.sonarsource.com/Distribution/sonar-scanner-cli/sonar-scanner-cli-3.3.0.1492-linux.zip
- unzip sonar-scanner-cli-3.3.0.1492-linux.zip -d /tmp
script: - /tmp/sonar-scanner-3.3.0.1492-linux/bin/sonar-scanner -Dsonar.projectKey=$SONARQUBE_PROJECT_KEY -Dsonar.sources=. -Dsonar.host.url=$SONARQUBE_URL -Dsonar.login=$SONARQUBE_LOGIN