That depends upon how you have configured your access log: you can
configure an access log to log only requests that failed and the
details of that request like this:
<Valve className="org.apache.catalina.valves.AccessLogValve"
conditionIf="org.apache.catalina.parameter_parse_failed"
....
/>
You will probably want to put "%t" and "%r" in your pattern.
This looks interesting. In my test environment (with Tomcat 7 and java
1.7) it shows by default
<Valve className="org.apache.catalina.valves.AccessLogValve"
directory="logs"
prefix="localhost_access_log." suffix=".txt"
pattern="%h %l %u %t "%r" %s %b" />
this should keep track of the errors just adding just the entry:
conditionIf="org.apache.catalina.parameter_parse_failed"
?
Unfortunately, this is a POST that is being processed and it's hard to
use the RequestDumperFilter to dump the requests of only certain
requests.... that might be the only way to get the offending parameter
name or value that is causing this problem.
Many thanks for your hints :)
Miguel
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