I have a Environment, with Wildfly 15.0.1 and when trying to migrate to Wildfly 23.x, noticing an error
INFO Migrating standalone configuration standalone-full.xml...
INFO Referenced paths migrated.
INFO Subsystem health added.
INFO Subsystem metrics added.
INFO Subsystem microprofile-jwt-smallrye added.
INFO Security realms migrated.
INFO Migrating standalone configuration standalone-full_qa4.xml...
ERROR Migration failed: org.jboss.migration.core.ServerMigrationFailureException: XML file filtering failed
at org.jboss.migration.core.util.xml.XMLFiles.filter(XMLFiles.java:167) [jboss-server-migration-core-1.11.0.Final.jar:1.11.0.Final]
at org.jboss.migration.core.util.xml.XMLFiles.filter(XMLFiles.java:119) [jboss-server-migration-core-1.11.0.Final.jar:1.11.0.Final]
at org.jboss.migration.wfly10.config.task.update.RemoveUnsupportedExtensions.removeExtensions(RemoveUnsupportedExtensions.java:119) [jboss-server-migration-wildfly10.0-1.11.0.Final.jar:1.11.0.Final]
at org.jboss.migration.wfly10.config.task.update.RemoveUnsupportedExtensions.lambda$getTask$0(RemoveUnsupportedExtensions.java:72) [jboss-server-migration-wildfly10.0-1.11.0.Final.jar:1.11.0.Final]
at org.jboss.migration.core.task.component.SimpleComponentTask$BaseBuilder.lambda$buildRunnable$0(SimpleComponentTask.java:119) [jboss-server-migration-core-1.11.0.Final.jar:1.11.0.Final]
...
at org.jboss.migration.cli.CommandLineServerMigration.main(CommandLineServerMigration.java:131) [jboss-server-migration-cli-1.11.0.Final.jar:1.11.0.Final]
Caused by: javax.xml.stream.XMLStreamException: ParseError at [row,col]:[848,1]
Message: XML document structures must start and end within the same entity.
at com.sun.org.apache.xerces.internal.impl.XMLStreamReaderImpl.next(XMLStreamReaderImpl.java:604) [rt.jar:1.8.0_362]
at com.sun.xml.internal.stream.XMLEventReaderImpl.nextEvent(XMLEventReaderImpl.java:83) [rt.jar:1.8.0_362]
at org.jboss.migration.core.util.xml.XMLFiles.filter(XMLFiles.java:134) [jboss-server-migration-core-1.11.0.Final.jar:1.11.0.Final]
... 35 more
INFO
------------------------------------------------------------------------------------------------------
Task Summary
------------------------------------------------------------------------------------------------------
server ...................................................................................... FAIL
modules.migrate-modules-requested-by-user .................................................. SUCCESS
modules.migrate-modules-requested-by-user.migrate-module(id=com.ca.iam.crypto:main) ....... SUCCESS
modules.migrate-modules-requested-by-user.migrate-module(id=com.ca.iam.bouncy:main) ....... SUCCESS
modules.migrate-modules-requested-by-user.migrate-module(id=com.ca.iam.idmutils:main) ..... SUCCESS
modules.migrate-modules-requested-by-user.migrate-module(id=com.ca.iam.log4j2.core:main) .. SUCCESS
modules.migrate-modules-requested-by-user.migrate-module(id=com.ca.iam.log4j2.api:main) ... SUCCESS
modules.migrate-modules-requested-by-user.migrate-module(id=com.ca.iam.nim:main) .......... SUCCESS
modules.migrate-modules-requested-by-user.migrate-module(id=com.ca.iam.cajasper:main) ..... SUCCESS
standalone ................................................................................. FAIL
standalone-configurations ................................................................. FAIL
standalone-configuration(source=iam_im-reference-standalone-full.xml) .................... SUCCESS
standalone-configuration(source=standalone-full-ha.xml) .................................. SUCCESS
standalone-configuration(source=standalone-full.xml) ..................................... SUCCESS
standalone-configuration(source=standalone-full_qa4.xml) ................................. FAIL
------------------------------------------------------------------------------------------------------
Migration Result: FAIL
------------------------------------------------------------------------------------------------------
Release : 14.4
The error indicates a problem with the standalone-full.xml file:
ERROR Migration failed: org.jboss.migration.core.ServerMigrationFailureException: XML file filtering failed...
...
Caused by: javax.xml.stream.XMLStreamException: ParseError at [row,col]:[848,1]
Message: XML document structures must start and end within the same entity.
Check the format and syntax at row 848 column 1 and fix as needed.
I would also suggest you engage your JBOSS admin as the migration utility is a rebranded Migration tool directly from the JBOSS folks with very minor software specific adjustments and your Jboss admin maybe able to help you past this quickly.