MINOR: use jdk8 to build/run system tests (#4925)

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.

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

@@ -27,13 +27,13 @@ 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
@@ -42,15 +42,15 @@ if [ -z `which javac` ]; then
     # as one line per dot in the build logs.
     # To avoid this noise we redirect all output to a file that we only show if apt-get fails.
     echo "Installing JDK..."
-    if ! apt-get -y install oracle-java7-installer oracle-java7-set-default >/tmp/jdk_install.log 2>&1 ; then
+    if ! apt-get -y install oracle-java8-installer oracle-java8-set-default >/tmp/jdk_install.log 2>&1 ; then
         cat /tmp/jdk_install.log
         echo "ERROR: JDK install failed"
         exit 1
     fi
     echo "JDK installed: $(javac -version 2>&1)"
 
-    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