https://bz.apache.org/bugzilla/show_bug.cgi?id=60413
Bug ID: 60413
Summary: RewriteValve: empty capturing group results in null
backreference instead of "" (empty) string
Product: Tomcat 8
Version: 8.5.x-trunk
Hardware: All
OS: All
Status: NEW
Severity: major
Priority: P2
Component: Catalina
Assignee: dev@tomcat.apache.org
Reporter: 1983-01...@gmx.net
Target Milestone: ----
Created attachment 34474
--> https://bz.apache.org/bugzilla/attachment.cgi?id=34474&action=edit
Avoid null return values
Consider this rule:
RewriteRule ^/docs(/rest)?$ /docs$1/ [redirect=307,L]
A GET on http://localhost:8080/app/docs redirects to
http://localhost:8080/tedab-services-webapp/docsnull/
The reason is m.group(n) returns a null when the capturing group is not
present. Worse than that, this null value is passed to ENCODER.encode() which
may result in a NPE.
Attached is a patched which resolves the issue by returning empty strings on
null. Feel free to improve the patch.
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