JAVACLASS grok pattern does not match square brackets "[]"

[l00d3r]

JAVACLASS Grok pattern does not match tomcats logger, Tomcats logger uses square brackets and is unchangeable according to documentation which says:

The calls to javax.servlet.ServletContext.log(...) to write log messages are handled by internal Tomcat logging. Such messages are logged to the category named

org.apache.catalina.core.ContainerBase.[${engine}].[${host}].[${context}]

This logging is performed according to the Tomcat logging configuration. You cannot overwrite it in a web application. 

Example of an unmatched tomcat log coming from spring boot:

2023-03-21 11:52:47.478 [http-nio-8071-exec-8] ERROR o.a.c.c.C.[.[.[.[dispatcherServlet] - Servlet.service() for servlet [dispatcherServlet] in context with path [/applicationpath] threw exception

I suggest a change to current grok pattern:

JAVACLASS (?:[a-zA-Z$_][a-zA-Z$_0-9]*\.)*[a-zA-Z$_][a-zA-Z$_0-9]*

to

JAVACLASS (?:[\[a-zA-Z$_][a-zA-Z$_0-9\]]*\.)*[\[a-zA-Z$_][a-zA-Z$_0-9\]]*