CODEWITHSUNDEEP
javaservletsinit-parameters
James
James

Reputation: 195

Using annotations to define multiple servlets of the same class with different init-params

I have previously achieved this by using web.xml like so:

<servlet>
  <servlet-name>Test1</servlet-name>
  <servlet-class>com.abc.test.Servlet</servlet-class>
  <init-param>
    <param-name>propertyKey</param-name>
    <param-value>test1</param-value>
  </init-param>
</servlet>
<servlet>
  <servlet-name>Test2</servlet-name>
  <servlet-class>com.abc.test.Servlet</servlet-class>
  <init-param>
    <param-name>propertyKey</param-name>
    <param-value>test2</param-value>
  </init-param>
</servlet>
<servlet-mapping>
  <servlet-name>Test1</servlet-name>
  <url-pattern>/test1</url-pattern>
</servlet-mapping>
<servlet-mapping>
  <servlet-name>Test2</servlet-name>
  <url-pattern>/test2</url-pattern>
</servlet-mapping>

This means that if I go to http://server/project/Test1, the Servlet class will get the value test1 for propertyKey and if I go to http://server/project/Test2, it will get the value test2.

I'm now starting to develop an application for Tomcat 7, so I tried to replicate this using annotations:

@WebServlet(name = "Test1", urlPatterns = "/test1", initParams = @WebInitParam(name = "propertyKey", value = "test1"))
@WebServlet(name = "Test2", urlPatterns = "/test2", initParams = @WebInitParam(name = "propertyKey", value = "test2"))
public class Servlet extends HttpServlet {
// ...

This resulted in the error "Duplicate annotation @WebServlet".

I also tried putting in arrays of parameters and URL patterns, but they still all apply to the same servlet.

Is it possible to do this, or should I just stick with web.xml? Or maybe I'll suck it up and go with ?propertyKey=test1 and ?propertyKey=test2 but I think it's nicer to hide that stuff.

Upvotes: 1

Views: 1400

Answers (1)

Sotirios Delimanolis
Sotirios Delimanolis

Reputation: 279890

If you don't want to go with XML, you can also register two (or more) instances of your Servlet with a ServletContainerInitializer and specify different init parameters.

Other than JB Nizet's suggestion, I don't think you'll find a solution with annotations.

Upvotes: 0

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