Add following to your project's pom.xml in section dependencies:

<project ...>
    ...
    <dependency>
        <groupId>org.openid4java</groupId>
        <artifactId>openid4java-consumer</artifactId>
        <!--artifactId>openid4java-server</artifactId-->
        <!--artifactId>openid4java-infocard</artifactId-->
        <!--artifactId>openid4java-xri</artifactId-->
        <!--artifactId>openid4java</artifactId-->
        <version>0.9.5</version>
    </dependency>
    ...
</project>