The import javax.servlet can't be resolved

You need to add the Servlet API to your classpath. In Tomcat 6.0, this is in a JAR called servlet-api.jar in Tomcat's lib folder. You can either add a reference to that JAR to the project's classpath, or put a copy of the JAR in your Eclipse project and add it to the classpath from there.

If you want to leave the JAR in Tomcat's lib folder:

• Right-click the project, click Properties.
• Choose Java Build Path.
• Click the Libraries tab
• Click Add External JARs...
• Browse to find servlet-api.jar and select it.
• Click OK to update the build path.

Or, if you copy the JAR into your project:

• Right-click the project, click Properties.
• Choose Java Build Path.
• Click Add JARs...
• Find servlet-api.jar in your project and select it.
• Click OK to update the build path.

If not done yet, you need to integrate Tomcat in your Servers view. Rightclick there and choose New > Server. Select the appropriate Tomcat version from the list and complete the wizard.

When you create a new Dynamic Web Project, you should select the integrated server from the list as Targeted Runtime in the 1st wizard step.

Or when you have an existing Dynamic Web Project, you can set/change it in Targeted Runtimes entry in project's properties. Eclipse will then automagically add all its libraries to the build path (without having a copy of them in the project!).

You need to set the scope of the dependency to 'provided' in your POM.

http://maven.apache.org/guides/introduction/introduction-to-dependency-mechanism.html#Dependency_Scope

<dependency>  
  <groupId>javax.servlet</groupId>
  <artifactId>servlet-api</artifactId>
  <version>2.4</version>
  <scope>provided</scope>
</dependency>

Then everything will be fine.