Maven
We can use Maven to manage our Java dependencies.
* HttpServlet is not a core Java library, so we have to get its class files.
Convert the project to a Maven project by right-clicking the project name and selecting Configure->Convert to Maven Project.

Choose the defaults and select Finish.
This creates the pom.xml file. Open it and select the lower pom.xml tab to view the source of the file.
After the closing </build> add the servlet API dependencies.
<dependencies>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
</dependency>
</dependencies>
You now have the code necessary to create servlets.
Drill¶
MyHelloWorldConvert your project to use Maven, and add servlet api dependencies to the pom.xml.