Manually download the latest JDK 9

.travis.yml

@@ -4,10 +4,10 @@ sudo: required
 dist: trusty
 group: edge
 jdk: oraclejdk9
-addons:
-  apt:
-    packages:
-      - oracle-java9-installer
+#addons:
+#  apt:
+#    packages:
+#      - oracle-java9-installer
 
 
 #jdk:
@@ -17,6 +17,13 @@ before_install:
   - chmod +x gradlew
   - mkdir -p ~/.gradle && echo "org.gradle.daemon=false" >> ~/.gradle/gradle.properties
   - export GRADLE_OPTS=-Xmx1024m
+  # From https://github.com/reactive-streams/reactive-streams-jvm/pull/383
+  - cd ~
+  - wget http://download.java.net/java/jdk9/archive/179/binaries/jdk-9+179_linux-x64_bin.tar.gz
+  - tar -xzf jdk-9+179_linux-x64_bin.tar.gz
+  - export JAVA_HOME=~/jdk-9
+  - PATH=$JAVA_HOME/bin:$PATH
+  - cd -
 
 after_success:
   - bash <(curl -s https://codecov.io/bash)