Use Jetty 9.4.9
Release notes:
<findbugs.version>1.3.9</findbugs.version>
<guava.version>18.0</guava.version>
<guice.version>3.0</guice.version>
- <jetty.version>9.4.8.v20171121</jetty.version>
+ <jetty.version>9.4.9.v20180320</jetty.version>
<scala.version>2.11.4</scala.version> <!-- When updating this, the scala.major-version in parent must also be updated! -->
<slf4j.version>1.7.5</slf4j.version>
