Cannot get Ciphermail running on CentOS7

I'm being forced to use CentOS 7 on a server, and I'm trying to install an older version of Ciphermail (4.11.0-0).

I follow all the steps for the related version to install. When I start Tomcat, catalina throws the following error:

Nov 15, 2021 9:50:20 AM org.apache.catalina.startup.HostConfig deployDescriptors
SEVERE: Error waiting for multi-thread deployment of context descriptors to complete
java.util.concurrent.ExecutionException: java.lang.NullPointerException
at java.util.concurrent.FutureTask.report(FutureTask.java:122)
at java.util.concurrent.FutureTask.get(FutureTask.java:192)
at org.apache.catalina.startup.HostConfig.deployDescriptors(HostConfig.java:597)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:493)
at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1757)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:333)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1370)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1542)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1552)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1520)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NullPointerException
at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:696)
at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1966)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
... 1 more

I've been digging online to try and solve this issue - and it could be related to some sort of JAR file issue inside the application - see here https://bz.apache.org/bugzilla/show_bug.cgi?id=53871#c16

Any ideas on what i can do to resolve this would be greatly appreciated.

OS:
NAME="CentOS Linux"
VERSION="7 (Core)"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="7"
PRETTY_NAME="CentOS Linux 7 (Core)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:7"
HOME_URL="https://www.centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"
CENTOS_MANTISBT_PROJECT="CentOS-7"
CENTOS_MANTISBT_PROJECT_VERSION="7"
REDHAT_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="7"
Kernel: 3.10.0-1160.31.1.el7.x86_64

So this isn't applicable anymore. I was able to get the latest version running, however had to deviate from the standard install steps as they weren't applicable.

So can mark as unsovled/closed/no longer needed.

Thanks!