diff --git a/install.sh b/install.sh
index f79f2f4..9727d16 100755
--- a/install.sh
+++ b/install.sh
@@ -1,13 +1,18 @@
 #!/bin/sh
 
 # the script must be started by root or with sudo permissions
+if [ "$EUID" -ne 0 ]
+  then echo "Please run as root."
+  exit
+fi
+
 # see http://www.oracle.com/technetwork/java/javase/downloads/java-archive-javase8-2177648.html
 # for jdk downloads
 
 # specify the jdk
-JDK='jdk1.8.0_77'
-JDKFILE='jdk-8u77-linux-x64.tar.gz'
-JDKPATH="http://download.oracle.com/otn-pub/java/jdk/8u77-b03/$JDKFILE"
+JDK='jdk1.8.0_161'
+JDKFILE='jdk-8u161-linux-x64.tar.gz'
+JDKPATH="http://download.oracle.com/otn-pub/java/jdk/8u161-b12/2f38c3b165be4555a1fa6e98c45e0808/$JDKFILE"
 
 # oracle request header
 ORACLELIC="Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie"
@@ -31,4 +36,4 @@ cp $BASEDIR/java.sh /etc/profile.d
 source ~/.bashrc
 
 # validate the installation
-java -version
+java -version
\ No newline at end of file