A Java library for reading and writing GTFS feeds, including database support.
See more documentation on the wiki.
In your pom.xml, include:
<repositories>
<repository>
<id>public.onebusaway.org</id>
<url>https://repo.camsys-apps.com/releases/</url>
</repository>
</repositories>
... and inside <dependencies>:
<dependency>
<groupId>org.onebusaway</groupId>
<artifactId>onebusaway-gtfs</artifactId>
<version>1.3.88</version>
</dependency>
...where <version> contains the latest version number.