Try travis_java_install script from pywrangler

.travis.yml

@@ -24,6 +24,7 @@ cache:
     - servers/
 
 before_install:
+    - source travis_java_install.sh
     - ./build_integration.sh
 
 install:

travis_java_install.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+
+# borrowed from: https://github.com/mansenfranzen/pywrangler/blob/master/tests/travis_java_install.sh
+
+# Kafka requires Java 8 in order to work properly. However, TravisCI's Ubuntu
+# 16.04 ships with Java 11 and Java can't be set with `jdk` when python is
+# selected as language. Ubuntu 14.04 does not work due to missing python 3.7
+# support on TravisCI which does have Java 8 as default.
+
+# show current JAVA_HOME and java version
+echo "Current JAVA_HOME: $JAVA_HOME"
+echo "Current java -version:"
+java -version
+
+# install Java 8
+sudo add-apt-repository -y ppa:openjdk-r/ppa
+sudo apt-get -qq update
+sudo apt-get install -y openjdk-8-jdk --no-install-recommends
+sudo update-java-alternatives -s java-1.8.0-openjdk-amd64
+
+# change JAVA_HOME to Java 8
+export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64