Tomcat 6 show weird message in catalina log

Question

I see tons of this error message in my Tomcat Catalina log:

Invalid chunk starting at byte [0] and ending at byte [0] with a value of [null] ignored

Does anyone has an idea what it means?

Answer 1

This is a minor bug that was introduced in Apache 6.0.35 and fixed in Apache 6.0.36. It is caused by parameters with more than one '&' character:

From the changelog:

Tomcat 6.0.36 (jfclere) released 2012-10-19

Catalina

[...]

Do not flag extra '&' characters in parameters as parse errors. (kkolinko)