diff --git a/home/jobs/OMERO-server/config.xml b/home/jobs/OMERO-server/config.xml
index 52e012e7..740dcc22 100644
--- a/home/jobs/OMERO-server/config.xml
+++ b/home/jobs/OMERO-server/config.xml
@@ -156,6 +156,8 @@ omero config set omero.security.trustStore /etc/pki/ca-trust/extracted/java/cace
 omero config set omero.security.trustStorePassword changeit
 omero config set omero.mail.config true
 omero config set omero.server.nodedescriptors master:Blitz-0,Indexer-0,Processor-0,Storm,Tables-0
+omero config set omero.jvmcfg.append '--add-opens java.base/java.lang=ALL-UNNAMED --add-exports java.naming/com.sun.jndi.ldap=ALL-UNNAMED'
+
 # omero config set omero.mail.from your_address
 # omero config set omero.mail.host your_smtp_server_for_example
 omero certificates
diff --git a/server/Dockerfile b/server/Dockerfile
index 01a2fb1e..3290deb1 100644
--- a/server/Dockerfile
+++ b/server/Dockerfile
@@ -38,6 +38,15 @@ RUN dnf -y install epel-release
 RUN dnf -y update
 RUN dnf -y install blosc
 
+# install various Java versions
+RUN dnf install -y java-21-openjdk-devel java-17-openjdk-devel
+RUN dnf install -y cronie
+
+# Add cron job to rotate java versions
+ADD ./root /var/spool/cron/
+RUN chmod +x  /var/spool/cron/root
+
+
 EXPOSE 4064
 EXPOSE 4063
 
diff --git a/server/root b/server/root
new file mode 100644
index 00000000..4c630af1
--- /dev/null
+++ b/server/root
@@ -0,0 +1,7 @@
+0 0 * * 0 ln -vfns /usr/lib/jvm/java-11-openjdk/bin/java /etc/alternatives/java
+0 0 * * 1 ln -vfns /usr/lib/jvm/java-17-openjdk/bin/java /etc/alternatives/java
+0 0 * * 2 ln -vfns /usr/lib/jvm/java-21-openjdk/bin/java /etc/alternatives/java
+0 0 * * 3 ln -vfns /usr/lib/jvm/java-11-openjdk/bin/java /etc/alternatives/java
+0 0 * * 4 ln -vfns /usr/lib/jvm/java-17-openjdk/bin/java /etc/alternatives/java
+0 0 * * 5 ln -vfns /usr/lib/jvm/java-21-openjdk/bin/java /etc/alternatives/java
+0 0 * * 6 ln -vfns /usr/lib/jvm/java-11-openjdk/bin/java /etc/alternatives/java