3370115 - SUM upgrade reports "Dialog validation with db2radm.jar failed".

Using SUM to update PI system's JAVA components and seeing the following error in step  'Input DBA User Credentials(DB2)':
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Process in diaglog state.
Current step: Input DBA User Credentials (DB2)
Dialog validation with db2radm.jar failed, see logfile: /usr/sap/SID/SUM/sdt/tmp/testDBADB2stdout_XX.txt
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Also seeing in other SUM logs:

testDBADB2stderr_XX.txt ->
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Error loading DB2 Driver...
java.lang.NumberFormatException: For input string: ""
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INPUT-USER-CREDENTIALS_XX.X.LOG ->
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Jul 7, 2023 2:48:51 PM [Info  ]: Dialog eliminator jeeAdminPassEliminator does not allow to omit dialog UserPasswords
Jul 7, 2023 2:48:51 PM [Info  ]: Dialog eliminator jeeAdminUserEliminator does not allow to omit dialog UserPasswords
Jul 7, 2023 2:49:34 PM [Info  ]: Validatable parameter J2EE/J2EEADMIN/PWD has been validated by validator RequiredFields.
Jul 7, 2023 2:49:34 PM [Info  ]: Validating password of JEE Engine User J2EE_ADMIN.
Jul 7, 2023 2:49:35 PM [Info  ]: Validatable parameter J2EE/J2EEADMIN/PWD has been validated by validator J2EEAdministratorPasswordValidator.
Jul 7, 2023 2:49:35 PM [Info  ]: Setting password variable for catalog key JeeAdminPassword into shared input catalog.
Jul 7, 2023 2:49:35 PM [Info  ]: Setting catalog key JeeAdminUser to value J2EE_ADMIN into shared input catalog.
Jul 7, 2023 2:49:35 PM [Info  ]: Saving data model JUP.J2EE.DataModel.xml ...
Jul 7, 2023 2:49:36 PM [Info  ]: Data model JUP.J2EE.DataModel.xml saved.
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• Netweaver AS Java any release
• DB2 z/OS any release

DB2 , db2radm.properties , java.lang.NumberFormatException , KBA , BC-DB-DB2 , DB2 for z/OS , BC-DB-DB2-UPG , DB2 for z/OS - Upgrade , Problem