Regarding multiple application contexts in a given web application

[Paritosh H Chandorkar]

Hello All,

Can there be more than one application contexts in a given web application?

Thanks and regards,
Paritosh Chandorkar

[Jayesh A Lalwani]

I think so. ALthough I haven't done it myself. You can put multiple DispatcherServlets in your web xml and map them to differrent paths. You can put the applicatiuon context as the contextCOnfig location parameter to the DispatcherServlet. SOmething like this

'springapp/war/WEB-INF/web.xml':
<?xml version="1.0" encoding="UTF-8"?>

<web-app version="2.4"
         xmlns="http://java.sun.com/xml/ns/j2ee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
         http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" >

  <servlet>
    <servlet-name>app1</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
     <init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value>app2.xml</param-value>
	</init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>

  <servlet>
    <servlet-name>app2</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
     <init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value>app2.xml</param-value>
	</init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>

  <servlet-mapping>
    <servlet-name>app1</servlet-name>
    <url-pattern>/app1/*</url-pattern>
  </servlet-mapping>

  <servlet-mapping>
    <servlet-name>app2</servlet-name>
    <url-pattern>/app2/*</url-pattern>
  </servlet-mapping>

  <welcome-file-list>
    <welcome-file>
      index.jsp
    </welcome-file>
  </welcome-file-list>

</web-app>

Try this out. I am pretty sure you can make it work

[Surendra Kumar]

The URL pattern in the servlet mapping above is what comes after the context root, isn't it?

I don't think that's possible.
I think it's something to do with container.
For example, in WebSphere, you have to supply the context root while deploying the app using Admin Console (there may be other ways to deploy), in which case you can't provide two context roots for the same app.

That's what my understanding is.

[Jayesh A Lalwani]

Since, the OP posted this thread in Spring, I'm pretty sure he means Spring application context.. not web application context

It's confusing... I know!! This is why I call the Spring application context "Spring xml" . Spring should have named application context something else.

[Surendra Kumar]

Jayesh A Lalwani wrote:I'm pretty sure he means Spring application context.. not web application context

Gotcha.

Sorry, I didn't read the question properly.

[Paritosh H Chandorkar]

Hello,

For application context there is no entry in web.xml.
So is the above way correct to create multiple application contexts in spring?
Just confirming

Thanks and regards,
Paritosh Chandorkar

[Surendra Kumar]

Paritosh H Chandorkar wrote:
Just confirming

You need to try and confirm, isn't it?

[Paritosh H Chandorkar]

Hello,

We just checked.

We can have two or more objects of application contexts.

Example:
ApplicationContext object1 =new ApplicationContext(Bean.xml);
ApplicationContext object2 =new ApplicationContext(Bean.xml);
It gets initialized twice and two application contexts are created.

Thanks for the reply:)Just confirmed your answer.

Thanks and regards,
Paritosh Chandorkar