This indicates an attack attempt to exploit a Code Injection vulnerability in JBoss RichFaces.
The vulnerability is due to insufficient sanitizing of user supplied URI inputs into the application. A remote attacker can exploit this to send a crafted query to execute arbitrary commands on a vulnerable server.
JBoss RichFaces before 4.5.4
JBoss RichFaces 4.5.3 through 4.5.17
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor: