SimpleUrlHandlerMapping not working for url with few extentions like dsm or ds - spring

Question

I am trying to implement SimpleUrlHandlerMapping in Spring. I am using Spring 4.2.5 version.
Following is my mapping
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
.....
<bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
<property name="mappings">
<props>
<prop key="/hello1.dsm">hc</prop>
</props>
</property>
</bean>
<bean id="hc" class="com.vaannila.HelloWorldController" >
<property name="message" value="Hello World!" />
</bean>
....
</beans>
When I run tomcat, I get the info message on console saying
org.springframework.web.servlet.handler.AbstractUrlHandlerMapping registerHandler
INFO: Mapped URL path [/hello1.dsm] onto handler 'hc'
But When I hit the url "http://localhost:8080/SpringExample5/hello1.dsm" in my browser I get the requested resource is not available error i.e 404.
Later when I change key to "/hello1.htm", it worked fine with respective url. I am wondering is there any rule on url extention while mapping url to controller.

Answer 1

In web.xml, The dispatcher servlet url pattern is configured to .htm extention
<?xml version="1.0" encoding="UTF-8"?>
............
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>*.htm</url-pattern>
</servlet-mapping>............
and hence It is working fine for ".htm" extention.
To make it work for other extentions we need to set corresponding url-pattern in web.xml file.