Github user dkuppitz commented on the issue:
https://github.com/apache/tinkerpop/pull/494
This is required to make it work:
```
daniel@cube /projects/apache/tinkerpop (pr-494) $ git diff
diff --git a/docker/build/Dockerfile.template
b/docker/build/Dockerfile.template
index 8364884..d32aa46 100644
--- a/docker/build/Dockerfile.template
+++ b/docker/build/Dockerfile.template
@@ -21,3 +21,7 @@ RUN mkdir -p /usr/src/tinkerpop
RUN curl -s https://bootstrap.pypa.io/ez_setup.py | python
WORKDIR /usr/src/tinkerpop
COPY . /usr/src/tinkerpop
+RUN chmod 744 ./.travis.install-maven.sh
+ENV M2_HOME /root/mvn-home
+ENV PATH ${M2_HOME}/bin:${PATH}
+RUN ./.travis.install-maven.sh 3.3.9 ${M2_HOME}
```
However, this should only go into `tp32`. In `master/` we should make the
maven installation part of the base image.
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