java - App engine default page to be servlet -

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i have app engine application, servlet:

<servlet>     <servlet-name>authorization</servlet-name>     <servlet-class>x.y.z.authorization</servlet-class> </servlet>  <servlet-mapping>     <servlet-name>authorization</servlet-name>     <url-pattern>/pattern</url-pattern> </servlet-mapping>

everything works. servlet invokes pattern http ://localhost/pattern

now want create autorizationservlet default page. need invoke servlet pattern:

http ://localhost

if write <url-pattern></url-pattern> have appengineconfigexception:

try : 

<url-pattern>/</url-pattern>

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