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: http://apache.org/xml/features/allow-java-encodings 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(SAXParserFactoryImpl.java:113) at org.apache.crimson.jaxp.SAXParserFactoryImpl.setFeature(SAXParserFactoryImpl.java:141)
        at 
org.apache.tomcat.util.digester.Digester.setFeature(Digester.java:526)
at org.apache.catalina.users.MemoryUserDatabase.open(MemoryUserDatabase.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.nextElementInternal(NamingContextBindingsEnumeration.java:115) at org.apache.naming.NamingContextBindingsEnumeration.next(NamingContextBindingsEnumeration.java:69) at org.apache.naming.NamingContextBindingsEnumeration.next(NamingContextBindingsEnumeration.java:32) at org.apache.catalina.mbeans.GlobalResourcesLifecycleListener.createMBeans(GlobalResourcesLifecycleListener.java:131) at org.apache.catalina.mbeans.GlobalResourcesLifecycleListener.createMBeans(GlobalResourcesLifecycleListener.java:105) at org.apache.catalina.mbeans.GlobalResourcesLifecycleListener.lifecycleEvent(GlobalResourcesLifecycleListener.java:80) at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123) 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:763)
        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.java:90) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.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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