Github user stain commented on the issue:
https://github.com/apache/incubator-commonsrdf/pull/22
I think it failed over a buggy and quite outdated JDK8 version on Travis:
```
$ java -Xmx32m -version
java version "1.8.0_31"
Java(TM) SE Runtime Environment (build 1.8.0_31-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.31-b07, mixed mode)
```
it seems to work with `mvn install` with [docker image
airdock/oracle-jdk](https://hub.docker.com/r/airdock/oracle-jdk/):
```
stain@biggiebuntu:~/src/incubator-commonsrdf$ docker run -t -i
airdock/oracle-jdk:latest bash
root@deb98bf92417:~# java -version
java version "1.8.0_74"
Java(TM) SE Runtime Environment (build 1.8.0_74-b02)
Java HotSpot(TM) 64-Bit Server VM (build 25.74-b02, mixed mode)
```
so I'll go ahead and merge.
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