How to update AS2 to new version

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We've been running AS2 1.1 build 31 and for the first time need to provide SHA2 support, so I'm looking to update to the current version. Is there information on how best to safely do this?
--Emile

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AS2

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Profile picture for user emilevansebille

After following the directions there I now get:
Exception in thread "main" java.lang.UnsupportedClassVersionError: de/mendelson/comm/as2/AS2 : Unsupported major.minor version 55.0

Profile picture for user emilevansebille

OK -- we've moved on to setting up a fresh ubuntu 20.04 install and fresh installed from there -- now we get a pop-up window captioned "Message" with the circled I for info icon saying "org/eclipse/jetty/xml/jetty/xml/XmlConfiguration" and in my events folder I find:

[Event description]
TimestampDescription=Dec 1, 2021, 3:24:11 PM
SeverityDescription=Error
OriginDescription=System
CategoryDescription=Server components
TypeDescription=Server startup
ProcessOriginHost=falcon-11-15
User=
Timestamp=1638401051726
Severity=3
Origin=1
Type=101
EventId=52b9efca-5a29-4689-bb4b-3e1267194031

[Summary]
[NoClassDefFoundError]

[Details]
org/eclipse/jetty/xml/XmlConfiguration

Can anyone tell me what that means?