How to build a application server independent Java web application?

Question

My question is about :

I have a Java web application which generates a EAR file and currently runs on IBM Websphere 6.1 .

In its pom.xml it has WebSphere version dependency , I want to remove complete dependency and make my application as server independent.

Below is the dependency:

      ` <dependency>
            <groupId>com.ibm.websphere</groupId>
            <artifactId>j2ee</artifactId>
            <version>6.0.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>com.ibm.websphere</groupId>
            <artifactId>web-services</artifactId>
            <version>6.0.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>com.ibm.websphere.jre</groupId>
            <artifactId>ibmjceprovider</artifactId>
            <version>6.0.2</version>
            <scope>provided</scope>
        </dependency>`

So that in future if I want to migrate to a different Application server from WebSphere , like to Tomcat or Jboss , there is no dependency in the code.

Is it possible ? If yes then what is the best approach to do it.

Thank you in advance.