'Apache CXF returns HTTP 415 Unsupported Media Type after upgrading TomEE 9.0.0-M2 to 9.0.0-M7

I wrote a simple RestApi a year ago which runs without any problems on Tomee Plus 9.0.0-M2. Now I downloaded the newest Tomee Plus 9.0.0-M7 and get following response on every request:

HTTP 415 Unsupported Media Type

The console output is:

No message body reader has been found for class controller.controller.TestRequest, ContentType: application/json
org.apache.cxf.jaxrs.impl.WebApplicationExceptionMapper toResponse
WARNING: jakarta.ws.rs.WebApplicationException: HTTP 415 Unsupported Media Type
    at org.apache.cxf.jaxrs.utils.JAXRSUtils.readFromMessageBody(JAXRSUtils.java:1427)

I don't use any Framework like Spring or so. What happenend to the Tomee? Is some configuration missing?

javajax-rscxfapache-tomeehttp-status-code-415


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