Include Ubercharts into your own pom.xml (includes only relevant parts)

pom.xml

<repositories>
    <repository>
        <id>xeraa-cloudbees-release</id>
        <name>Cloudbees releases of xeraa</name>
        <url>dav:https://repository-xeraa.forge.cloudbees.com/release/</url>
        <releases>
            <enabled>true</enabled>
        </releases>
    </repository>
    <repository>
        <id>xeraa-cloudbees-snapshot</id>
        <name>Cloudbees snapshots of xeraa</name>
        <url>dav:https://repository-xeraa.forge.cloudbees.com/snapshot/</url>
        <snapshots>
            <enabled>true</enabled>
        </snapshots>
    </repository>
</repositories>

<dependencies>
    <dependency>
        <groupId>ubercharts</groupId>
        <artifactId>ubercharts-lib</artifactId>
        <version>0.2-SNAPSHOT</version>
    </dependency>
</dependencies>