CODEWITHSUNDEEP
jakarta-eeservletsservlet-filters
Aravind A
Aravind A

Reputation: 9697

Filter mapping issue

I am using a some filter mapping for my project . The following filter pattens hit the filter

<filter-mapping>
       <filter-name>wygUserCheckFilter</filter-name>
       <url-pattern>*.jsp</url-pattern>
</filter-mapping>

<filter-mapping>
       <filter-name>wygUserCheckFilter</filter-name>
       <url-pattern>/myProject/MyDisplay.jsp</url-pattern>
</filter-mapping>

But the one below doesn't hit the filter

<filter-mapping>
       <filter-name>wygUserCheckFilter</filter-name>
       <url-pattern>/myProject/*.jsp</url-pattern>
</filter-mapping>

Why is this so ?

Upvotes: 0

Views: 335

Answers (2)

yatskevich
yatskevich

Reputation: 2093

From Servlet 2.5 spec:

SRV.11.2

Specification of Mappings

In the Web application deployment descriptor, the following syntax is used to define mappings:

  • A string beginning with a ‘/’ character and ending with a ‘/*’ suffix is used for path mapping.
  • A string beginning with a ‘*.’ prefix is used as an extension mapping.
  • A string containing only the ’/’ character indicates the "default" servlet of the application. In this case the servlet path is the request URI minus the context path and the path info is null.
  • All other strings are used for exact matches only.

Upvotes: 2

Mikko Maunu
Mikko Maunu

Reputation: 42114

Because * in the middle of the pattern matches only to the * character. Only matching url for /myProject/*.jsp-pattern is exactly same string. * does have special meaning only in the following cases (Servlet 2.4 Specification):

  • A string beginning with a ‘/’ character and ending with a ‘/*’ suffix is used for path mapping.
  • A string beginning with a ‘*.’ prefix is used as an extension mapping.
  • A string containing only the ’/’ character indicates the "default" servlet of the application. In this case the servlet path is the request URI minus the con- text path and the path info is null.
  • All other strings are used for exact matches only.

Upvotes: 3

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