diff --git a/.travis.yml b/.travis.yml
index 73693a5d0a..c6b9d3f7a3 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,7 @@
 language: java
 
 jdk:
-  - oraclejdk8
+  - openjdk8
 
 os:
   - linux
diff --git a/core/javacc.gradle b/core/javacc.gradle
index dfc6e298fd..c1b54330a5 100644
--- a/core/javacc.gradle
+++ b/core/javacc.gradle
@@ -2,7 +2,7 @@
 task downloadJavacc {
     ext.file = "javacc-5.0.tar.gz"
     ext.dest = file("$buildDir/javacc/$file")
-    ext.url = "https://javacc.org/downloads/$file"
+    ext.url = "http://download.openpkg.org/components/cache/javacc/$file"
 
     outputs.file dest
 
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index aaed54d701..648517d9a8 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=http\://services.gradle.org/distributions/gradle-3.1-all.zip
\ No newline at end of file
+distributionUrl=https\://services.gradle.org/distributions/gradle-3.1-all.zip
\ No newline at end of file