MINOR: use jdk8 to build/run system tests (#4944)

Debian installer packages are no longer available for Java 7.

Also upgrade AMI to latest ubuntu/trusty 14 amd64 as the older
one is no longer available.

Note that this only changes the JDK used to build and run
the system tests. We still have Jenkins jobs that compile
and run the JUnit tests with Java 7 so that we don't use
features that are only available in newer Java versions.

This is a backport of #4925 to the 0.10.2 branch.

Vagrantfile

@@ -40,7 +40,7 @@ ec2_keypair_file = nil
 
 ec2_region = "us-east-1"
 ec2_az = nil # Uses set by AWS
-ec2_ami = "ami-9eaa1cf6"
+ec2_ami = "ami-905730e8"
 ec2_instance_type = "m3.medium"
 ec2_user = "ubuntu"
 ec2_instance_name_prefix = "kafka-vagrant"
@@ -80,7 +80,7 @@ Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
       # share to a temporary location and the provisioning scripts symlink data
       # to the right location.
       override.cache.enable :generic, {
-        "oracle-jdk7" => { cache_dir: "/tmp/oracle-jdk7-installer-cache" },
+        "oracle-jdk8" => { cache_dir: "/tmp/oracle-jdk8-installer-cache" },
       }
     end
   end

vagrant/base.sh

@@ -23,20 +23,20 @@ if [ -z `which javac` ]; then
     apt-get -y update
 
     # Try to share cache. See Vagrantfile for details
-    mkdir -p /var/cache/oracle-jdk7-installer
-    if [ -e "/tmp/oracle-jdk7-installer-cache/" ]; then
-        find /tmp/oracle-jdk7-installer-cache/ -not -empty -exec cp '{}' /var/cache/oracle-jdk7-installer/ \;
+    mkdir -p /var/cache/oracle-jdk8-installer
+    if [ -e "/tmp/oracle-jdk8-installer-cache/" ]; then
+        find /tmp/oracle-jdk8-installer-cache/ -not -empty -exec cp '{}' /var/cache/oracle-jdk8-installer/ \;
     fi
-    if [ ! -e "/var/cache/oracle-jdk7-installer/jdk-7u80-linux-x64.tar.gz" ]; then
-        # Grab a copy of the JDK since it has moved and original downloader won't work
-        curl -s -L "https://s3-us-west-2.amazonaws.com/kafka-packages/jdk-7u80-linux-x64.tar.gz" -o /var/cache/oracle-jdk7-installer/jdk-7u80-linux-x64.tar.gz
+    if [ ! -e "/var/cache/oracle-jdk8-installer/jdk-8u171-linux-x64.tar.gz" ]; then
+      # Grab a copy of the JDK since it has moved and original downloader won't work
+      curl -s -L "https://s3-us-west-2.amazonaws.com/kafka-packages/jdk-8u171-linux-x64.tar.gz" -o /var/cache/oracle-jdk8-installer/jdk-8u171-linux-x64.tar.gz
     fi
 
     /bin/echo debconf shared/accepted-oracle-license-v1-1 select true | /usr/bin/debconf-set-selections
-    apt-get -y install oracle-java7-installer oracle-java7-set-default
+    apt-get -y install oracle-java8-installer oracle-java8-set-default
 
-    if [ -e "/tmp/oracle-jdk7-installer-cache/" ]; then
-        cp -R /var/cache/oracle-jdk7-installer/* /tmp/oracle-jdk7-installer-cache
+    if [ -e "/tmp/oracle-jdk8-installer-cache/" ]; then
+        cp -R /var/cache/oracle-jdk8-installer/* /tmp/oracle-jdk8-installer-cache
     fi
 fi