Unbreak Travis build

Author: cushon

.travis.yml

@@ -5,8 +5,18 @@ dist: trusty
 jdk:
   - oraclejdk8
   - oraclejdk9
-  - oraclejdk10
-  - oraclejdk11
+  - openjdk11
+  - openjdk-ea
+
+matrix:
+  include:
+    - jdk: openjdk10
+      before_install:
+        # https://github.com/travis-ci/travis-ci/issues/9368#issuecomment-395354755
+        - rm "${JAVA_HOME}/lib/security/cacerts"
+        - ln -s /etc/ssl/certs/java/cacerts "${JAVA_HOME}/lib/security/cacerts"
+  allow_failures:
+    - jdk: openjdk-ea
 
 # see https://github.com/travis-ci/travis-ci/issues/8408
 before_install: