Hi Maxime,
as Eric mentioned, you cannot use Spring v5 on WAS 8.5.
If you are interested to analyze what has to be changed in your application to run on WAS v9 or Liberty, you could use the free of charge binaryScanner:
Migration Toolkit for Application Binaries (ibm.com)You can also use the IBM Transformation Advisor if you want to get a more details assessment of your application:
IBM Cloud Transformation Advisor - IBM Garage PracticesIf you want, we can also set up a web conference to discuss your options and how IBM can help.
Please contact me if you are interested in.
Lars
------------------------------
Lars Besselmann
Integration Technical Specialist, IBM Technology Sales, EMEA
IBM
Düsseldorf
------------------------------