update to java 11

Dockerfile

@@ -15,7 +15,17 @@ ENV VERSION=${version} \
     IMAGE=shibboleth_idp_ui \
     MAINTAINER=InCommon
 
-COPY containerfiles/RPM-GPG-KEY-azulsystems .
+# Install Corretto Java JDK
+#Corretto download page: https://docs.aws.amazon.com/corretto/latest/corretto-11-ug/downloads-list.html
+ARG CORRETTO_URL_PERM=https://corretto.aws/downloads/latest/amazon-corretto-11-x64-linux-jdk.rpm
+ARG CORRETTO_RPM=amazon-corretto-11-x64-linux-jdk.rpm
+COPY container_files/corretto-signing-key.pub .
+RUN curl -O -L $CORRETTO_URL_PERM \
+    && rpm --import corretto-signing-key.pub \
+    && rpm -K $CORRETTO_RPM \
+    && rpm -i $CORRETTO_RPM \
+    && rm -r corretto-signing-key.pub $CORRETTO_RPM
+ENV JAVA_HOME=/usr/lib/jvm/java-1.11.0-amazon-corretto
 
 RUN yum -q -qy update \
     && yum -qy install --setopt=tsflags=nodocs epel-release \