This indicates an attack attempt to exploit a Local File Inclusion vulnerability in Apache Tomcat.
The vulnerability is due to an error when the vulnerable software handles a maliciously crafted request. A remote attacker may be able to exploit this to gain access to sensitive information.
Apache Tomcat 6
Apache Tomcat 7x Apache Tomcat 8x Apache Tomcat 9x
Information Disclosure: Remote attackers can gain sensitive information from vulnerable systems
Currently we are unaware of any vendor supplied patch for this issue.