Horváth, Ákos Péter created WW-3956:
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Summary: silent failure of filter initialization if
struts.action.excludePattern contains invalid regexp
Key: WW-3956
URL: https://issues.apache.org/jira/browse/WW-3956
Project: Struts 2
Issue Type: Bug
Components: Dispatch Filter
Affects Versions: 2.3.8
Environment: all
Reporter: Horváth, Ákos Péter
If the struts.action.excludePatterns constant contains an invalid regexp (for
example, it begins with a "*"), the dispatcher can't initialize, but only an
"Error filterStart" message will be logged, and the web app won't work. Imho,
the expected behavior were a stack trace or a more descriptive error message.
The cause of the problem: the buildExcludedPatternList() method of
org.apache.struts2.dispatcher.ng.InitOperations.java builds a compiled pattern
list of the comma-separated patterns given in this constant with
java.util.regex.Pattern.compile() . This emits an IllegalArgumentException or a
PatternSyntaxException, if invalid regexp is given, but this exception
somewhere silently disappears on his way to the log.
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I suggest to make a minimal example in the documentation:
.*\.(css|js|gif|png|jpg|html)$
is what most developer wants from this constant. For me take hours to
investigate this. Googling for "struts.action.excludePattern" reveals a lot of
confusion about this, too. The greatest source of the confusion is that it
isn't clear, and isn't anywhere documented, which is the exact regexp syntax
here to apply. For example: pattern matching or regular expression, "^" and "$"
are valid or not, they are needed or not, "." matches only "." or any
character, etc. I think, the original inaccuracy was committed by sun, when
they named a class as "Pattern", which operates with regexps. What you here can
do, is a single-line minimal-example in the doc, which will explain everything.
Thank you,
PH
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