I'm no expert, especially on AS400's, but make sure that your Java 8 is good. 
Saw someone on CentOS having a similar issue and it was a bad Java.

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> -----Original Message-----
> From: James H. H. Lampert <[email protected]>
> Sent: Monday, August 2, 2021 6:31 PM
> To: Tomcat Users List <[email protected]>
> Subject: Tomcat 8.5.68 failing on takeoff!
> 
> This is beyond my pay grade, I'm afraid. Hopefully somebody here has a clue
> what went wrong.
> 
> I installed Tomcat 8.5.68 on an AS/400 with Java 8, that had been running
> Tomcat 7 for years with no problems.
> 
> On launching Tomcat 8, if I try to connect to "manager" (the only context
> currently in Webapps), right after:
> 
> 02-Aug-2021 18:15:11.655 INFO [main]
> org.apache.catalina.startup.Catalina.load Initialization processed in
> 3271 ms
> 
> I'm getting
> 
> 02-Aug-2021 18:15:11.707 WARNING [main]
> org.apache.catalina.users.MemoryUserDatabase.open Exception configuring
> digester to permit java encoding names in XML files. Only IANA encoding
> names will be supported.
> org.xml.sax.SAXNotRecognizedException: Feature:
> https://urldefense.com/v3/__http://apache.org/xml/features/allow-java-
> encodings__;!!F9svGWnIaVPGSwU!9FyRcl2TpIK2uUGhl8znN39ty5Z8hd7W3z
> MEHabLBNJauJFSdGQX9Qyj1azOxNKQgopT690$
>       at
> org.apache.crimson.parser.XMLReaderImpl.setFeature(XMLReaderImpl.java
> :213)
>       at
> org.apache.crimson.jaxp.SAXParserImpl.setFeatures(SAXParserImpl.java:143
> )
>       at
> org.apache.crimson.jaxp.SAXParserImpl.<init>(SAXParserImpl.java:126)
>       at
> org.apache.crimson.jaxp.SAXParserFactoryImpl.newSAXParserImpl(SAXPars
> erFactoryImpl.java:113)
>       at
> org.apache.crimson.jaxp.SAXParserFactoryImpl.setFeature(SAXParserFactor
> yImpl.java:141)
>       at
> org.apache.tomcat.util.digester.Digester.setFeature(Digester.java:526)
>       at
> org.apache.catalina.users.MemoryUserDatabase.open(MemoryUserDatabas
> e.java:440)
>       at
> org.apache.catalina.users.MemoryUserDatabaseFactory.getObjectInstance(
> MemoryUserDatabaseFactory.java:105)
>       at
> org.apache.naming.factory.FactoryBase.getObjectInstance(FactoryBase.java
> :96)
>       at
> javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:
> 332)
>       at
> org.apache.naming.NamingContext.lookup(NamingContext.java:847)
>       at
> org.apache.naming.NamingContext.lookup(NamingContext.java:157)
>       at
> org.apache.naming.NamingContextBindingsEnumeration.nextElementIntern
> al(NamingContextBindingsEnumeration.java:115)
>       at
> org.apache.naming.NamingContextBindingsEnumeration.next(NamingConte
> xtBindingsEnumeration.java:69)
>       at
> org.apache.naming.NamingContextBindingsEnumeration.next(NamingConte
> xtBindingsEnumeration.java:32)
>       at
> org.apache.catalina.mbeans.GlobalResourcesLifecycleListener.createMBean
> s(GlobalResourcesLifecycleListener.java:131)
>       at
> org.apache.catalina.mbeans.GlobalResourcesLifecycleListener.createMBean
> s(GlobalResourcesLifecycleListener.java:105)
>       at
> org.apache.catalina.mbeans.GlobalResourcesLifecycleListener.lifecycleEvent
> (GlobalResourcesLifecycleListener.java:80)
>       at
> org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:1
> 23)
>       at
> org.apache.catalina.util.LifecycleBase.setStateInternal(LifecycleBase.java:423
> )
>       at
> org.apache.catalina.util.LifecycleBase.setState(LifecycleBase.java:366)
>       at
> org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:7
> 63)
>       at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
>       at org.apache.catalina.startup.Catalina.start(Catalina.java:688)
>       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>       at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.j
> ava:90)
>       at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
> sorImpl.java:55)
>       at java.lang.reflect.Method.invoke(Method.java:508)
>       at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:345)
>       at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:476)
> 
> 
> I can't recall ever seeing anything like this.
> 
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