It's still good to get Maven into the project, even though those tags are a pain in the balls, but for the best, it's nice to have a bite
Right-click on the project, Configure this will see convert to Maven, then click on this to give the project an ID
You can use more than one M of things, in the code you may not see the class source code,
Once you've downloaded maven, you can look at the source code, which makes Maven pretty good.
Then is the management jar package aspect, can get something from this net: http://mvnrepository.com/
<dependency><groupId>javax.servlet</groupId><artifactId>jsp-api</artifactId><version>2.0</version></dependency>
This is the format, so the package is in Maven managed jar package, pay special attention to some are dependent on jdk15, under the need to label below
<dependency><groupId>net.sf.json-lib</groupId><artifactId>json-lib</artifactId><version>2.4</version><classifier>jdk15</classifier></dependency>
Java Project becomes MAVEN project