_+UPDATE+_ Around 2 weeks ago,I did clean WAR install of XWiki 18.0.0 on Tomcat 11.0.18 with PostgreSQL 18.1 OpenJDK 25.0.2 (officail from Microsoft). And install log didn't have such warnings.
I don't have saved initial logs or screen from W11Pro OS, when I did install of XWiki WAR 16.x version on Tomcat 10.x with PostgreSQL 16.x, having pre-installed Java 17 I used official JDK from [Oracle website|https://www.oracle.com/java/technologies/downloads/] and during installation of XS flavor I didn't have no warnings and errors in the install log.
I think, the only reason [~iandriuta] could have such warnings due to complex install such as Docker with Proxy set-up or due to bad set-up. But such warnings have no connection to XWiki, because Java does not trust the SSL certificate presented by such server and you have to add such certificate to the JVM truststore.
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