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Asked: 2026-05-11T01:02:13+00:00

I just stumbled unto a weirdness in my JSP code. It seems that a

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I just stumbled unto a weirdness in my JSP code. It seems that a double backslash followed by a dollar or percent symbol gets converted to a single backslash (plus symbol).

That is, the following JSP:

<%@ page contentType='text/html;charset=UTF-8' pageEncoding='UTF-8' %> \\# \\$ \\% \\^

gets rendered as:

\\# \$ \% \\^

I’m using JDK 1.6.0_02 and Apache Tomcat 5.5.23 and 6.0.16 (two machines).

Is this a bug in Tomcat? JDK? Or is it conforming to some obscure option in the JSP spec? I tried looking at the spec but couldn’t find anything useful.

Workarounds are fairly trivial, I just thought I’d file a bug in case it is one.

EDIT: Heh, stackoverflow also mangles backslashes

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1 Answer

  1. \$ is in the spec (Section JSP.1.6). ‘Only when EL is enabled for the page…., a literal $ can be quoted by \$.

    \% will probably be because ‘A literal <% is quoted by <\%’. I suspect that the parser isn’t checking for the < before the \%.

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