All,
I'm not sure if this is the first time I've tried something like this,
but I was surprised by the behavior I observed today when trying to
configure a new Filter.
I have an existing Filter that looks at Cookies provided in a request.
I wanted to add a new Filter that takes request parameters and returns
them from request.getCookies() but only for a small number of URL
patterns which we handle only internally, both for security (?) and also
for performance, since this isn't a really common thing for us to do.
So I have these two filters:
<filter>
<filter-name>cookieUserFilter</filter-name>
<filter-class>...</filter-class>
</filter>
<filter>
<filter-name>cookieParameterFilter</filter-name>
<filter-class>...</filter-class>
</filter>
<filter-mapping>
<filter-name>cookieParameterFilter</filter-name>
<url-pattern>*.xml.do</url-pattern>
<url-pattern>/some/specific/pattern</url-pattern>
<filter-pattern>
<filter-mapping>
<filter-name>cookieUserFilter</filter-name>
<url-pattern>*.do</url-pattern>
<url-pattern>*.jsp</url-pattern>
<filter-pattern>
I have tested that both Filters work as expected when called. However,
when I configure them as above and request /foo.xml.do, only the
cookieUserFilter is being called. The cookieParameterFilter is not being
called. I'm explicitly defining them in that order to ensure that the
cookieParameterFilter is called /first/ to ensure that the parameters
are converted into Cookies before the cookieUserFilter is called.
In order to get the cookieParameterFilter to be called, I have to
configure it like this in my filter-mapping:
<filter-mapping>
<filter-name>cookieParameterFilter</filter-name>
<url-pattern>*.do</url-pattern>
<url-pattern>*.xml.do</url-pattern><!-- this probably no longer
matters -->
<url-pattern>/some/specific/pattern</url-pattern>
<filter-pattern>
This means it will apply to all requests, which isn't what I want.
The only thing I can think of is that *.xml.do isn't mapped to any
specific servlet, while *.do /is/. Will <filter>s only apply to URL
patterns that are explicitly-mapped to a specific servlet?
That doesn't sound right to me. I have other mappings that only map to a
URL space and not anything that has a specific servlet mapping.
What am I missing?
This is Tomcat 9.0.85 and everything is defined in WEB-INF/web.xml.
-chris
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