'Tomcat catalina.out File

Does anyone know what the following entry means in the catalina.out file? Sometimes there will be a bunch of them and I am wondering if there is some process creating the request? I am not able to "manually" create the "-" in my browser request. The "400" Bad Requests that I create look different.

10.14.99.69 - - [11/Feb/2022:20:12:44 +0000] "-" 400 -

Normal log entry.

10.13.23.7 - - [11/Feb/2022:20:15:23 +0000] "GET /web/wicket/bookmarkable/org.web.LoginPage?error=true HTTP/1.1" 200 2167



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