How to fix an error when building a project in travis?

Question

Java

When building a project in travis, there is an error
The command "eval mvn install -DskipTests=true -Dmaven.javadoc.skip=true -B -V " failed 3 times.
The command "mvn install -DskipTests=true -Dmaven.javadoc.skip=true -B -V" failed and exited with 1 during .

I googled to add maven-compiler-plugin 1.7 plugin to pom.xml I installed it but it doesn't help

Answer 1

more specifically Failed during checkstyle execution: There is 1 error reported by Checkstyle 6.11.2 with checkstyle.xml ruleset