PrimeFaces 10: Legacy theme is not applied

[sweintritt]

I have moved an application from PrimeFaces 8.0 to PrimeFaces 10.0.0. The application has a legacy theme which is located at

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src/main/webapp/resources/primefaces-metroui

The theme is set via web.xml

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   <context-param>
        <param-name>primefaces.THEME</param-name>
        <param-value>metroui</param-value>
    </context-param>

After switching from 8 to 10 the theme is not used any more. Only the saga theme. If I try to use any other provided PF-Theme, they also do not work. I don't get any error messages. In my browser I see that only the saga theme is loaded.
I tried to disable the theme and added my theme css in the head section of my main page

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<context-param>
     <param-name>primefaces.THEME</param-name>
     <param-value>none</param-value>
</context-param>

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<h:outputStylesheet
    library="css"
    name="metroui.css" />

I have copied the theme.css into the css folder of my web application

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src/main/resources/resources/css

I can see that the file is loaded during the page load, but I don't see any change in the theme of my page.

Is there any chance the old theme will work in PF 10?

[tandraschko]

we didnt change the handling
try to debug our HeadRenderer, if the context param is ignored

you can also check the applied CSS in your debuger tools in firefox/chrome, what exactly happens

[sweintritt]

Problem was that the web.xml was not read while using the embedded Tomcat of my Spring Boot application. The application worked fine on the server. I fixed the problem by using a ServletContextInitializer to set the parameters for PrimeFaces and everything is back to normal.

I don't understand why this was an issue after the switch to PFX, because it is not related to PF but to Spring.

Thanks for the help!