issue #1048: add installation script for Oracle Java 8 JVM

toolset/setup/linux/languages/java8.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+sudo add-apt-repository -y ppa:webupd8team/java
+sudo apt-get update
+echo oracle-java8-installer shared/accepted-oracle-license-v1-1 select true | sudo /usr/bin/debconf-set-selections
+sudo apt-get install oracle-java8-installer
+
+# set Java 7 (OpenJDK) as the default, as previously.
+sudo update-alternatives --set java /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java
+sudo update-alternatives --set javac /usr/lib/jvm/java-7-openjdk-amd64/bin/javac
+
+update-alternatives --get-selections | grep java-8 | sed -e 's/java-8-oracle/java-7-openjdk-amd64/' | while read line
+do
+  l=(${line// / })
+  n=${l[0]}
+  p=${l[2]}
+  if [ -e "$p" ]; then
+    sudo update-alternatives --set $n "$p"
+  fi
+done