+set -x
+
+#check Java version install if any
+JAVA_CMD="java"
+[ -n "$JAVA_HOME" ] && JAVA_CMD="$JAVA_HOME/bin/java"
+JAVA_VER=$("$JAVA_CMD" -version 2>&1 | sed -n ';s/.* version "\(.*\)\.\(.*\)\..*".*$/\1\2/p;')
+echo $JAVA_VER
+JAVAC_CMD="javac"
+[ -n "$JAVA_HOME" ] && JAVAC_CMD="$JAVA_HOME/bin/javac"
+JAVAC_VER=$("$JAVAC_CMD" -version 2>&1 | sed -n ';s/javac \(.*\)\.\(.*\)\..*.*$/\1\2/p;')
+echo $JAVAC_VER
+if [ "$JAVA_VER" -ge 110 -a "$JAVAC_VER" -ge 110 ];then
+ echo "ok, java is 11 or newer"
+else
+ #java 11 installation for CentOS (releng OS image target)
+ echo "install java 11"
+ sudo yum install -y java-11-openjdk java-11-openjdk-devel
+ last_installed_jdk11=$(ls -tr1 /usr/lib/jvm/ | grep java-11-openjdk-11 | tail -1)
+ if [ -n "$last_installed_jdk11" ];then
+ sudo alternatives --set java /usr/lib/jvm/$last_installed_jdk11/bin/java
+ sudo alternatives --set javac /usr/lib/jvm/$last_installed_jdk11/bin/javac
+ else
+ echo "No java11 available"
+ exit 1
+ fi
+fi
+
+#download maven image 3.8.6 and install it
+wget -nv https://dlcdn.apache.org/maven/maven-3/3.8.6/binaries/apache-maven-3.8.6-bin.tar.gz -P /tmp