Good Morning,
So here is what I know of the .war file. I did not use the .war file
(octane.war) from the existing server when installed everything on the new
server. I used the .war file that the vendor sent with the latest install
files.
Attached is the list of files from the unzipped .war WEB-INF/lib directory. I
put the files side by side and you can see that the new server has one file
that does not exist on the original server, javax.mail-api-1.6.2.jar.
And the original server has two files that don’t exist on the new server,
log4j-1.2.8.jar, log4j-core.jar
Looks like the rest of the files are the same although I did not check that the
sizes of each file are the same.
Hopefully these mean something to you,
Thanks for the help,
Bill
From: Zdeněk Henek <[email protected]>
Sent: Tuesday, March 10, 2026 4:18 PM
To: Tomcat Users List <[email protected]>
Subject: Re: Apache Tomcat 10 Issue
Hi,
No, these jar files in <tomcat>/lib are tomcat related only.
Next step,
send us what is in the application war file. War file is just zip
file. Unzip it and send us list of jar files in WEB-INF/lib directory
Zdenek
On Tue, Mar 10, 2026 at 8:20 PM Short, William J. <[email protected]> wrote:
Here are all of the .jar files on the old server. I did not move any of these
manually to the new server. Should I be moving these?
Also, I do not need to go to Tomcat 10, as long as I am on a stable version
with no vulnerabilities I am happy.
annotations-api.jar
catalina-ant.jar
catalina-ha.jar
catalina-storeconfig.jar
catalina-tribes.jar
catalina.jar
ecj-4.9.jar
el-api.jar
jasper-el.jar
jasper.jar
jaspic-api.jar
jsp-api.jar
servlet-api.jar
tomcat-api.jar
tomcat-coyote.jar
tomcat-dbcp.jar
tomcat-i18n-cs.jar
tomcat-i18n-de.jar
tomcat-i18n-es.jar
tomcat-i18n-fr.jar
tomcat-i18n-ja.jar
tomcat-i18n-ko.jar
tomcat-i18n-pt-BR.jar
tomcat-i18n-ru.jar
tomcat-i18n-zh-CN.jar
tomcat-jdbc.jar
tomcat-jni.jar
tomcat-util-scan.jar
tomcat-util.jar
tomcat-websocket.jar
websocket-api.jar
From: Zdeněk Henek <[email protected]>
Sent: Friday, March 6, 2026 11:55 AM
To: Tomcat Users List <[email protected]>
Subject: Re: Apache Tomcat 10 Issue
Hi,
Given that it’s “com/sun/mail” I suspect you will need the original (sun) jvm.
com.sun.mail is not part of jvm.
option 1 - add missing jar file
There is a missing jar. Maybe removed by accident during upgrade?
e.g.
https://mvnrepository.com/artifact/javax.mail/mail<https://mvnrepository.com/artifact/javax.mail/mail>
Look into the old Tomcat 9.0.16 into <tomcat>/lib directory. Maybe the
jar is there and you moved only the war file?
option 2
if you use javax.mail-api it contains only javax. classes
e.g. here
https://mvnrepository.com/artifact/javax.mail/javax.mail-api<https://mvnrepository.com/artifact/javax.mail/javax.mail-api>
solution is replace the mail-api with full mail jar file as above.
Get first work the tomcat 9, upgrade to tomcat 10 will need more
changes. The automated migration tool is good but for long term you
definitely need migration. Sometimes it is easy sometimes it is hard,
but Tomcat 9/9.1 will be here a few years so you have enough time.
Regards,
Zdenek Henek
On Fri, Mar 6, 2026 at 4:28 PM Rob Sargent
<[email protected]<mailto:[email protected]>> wrote:
On Mar 6, 2026, at 9:13 AM, Short, William J.
<[email protected]<mailto:[email protected]>> wrote:
Sorry for the delay in response.
I created a new VM with Server 2025.
I didn't exactly recreate current environment because I didn't want to install
versions with known vulnerabilities. I got it as close as I could. I am still
having the same problem with sending email notifications. Here is my current
setup:
Your rebuild has not included the same version of some jar (or jvm) with which
the application was compiled. Hence the NoClassDef error.
Given that it’s “com/sun/mail” I suspect you will need the original (sun) jvm.
But it would be better to recompile the app with new java. And likely a new
mail making provider
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