Sanity test: Make sure the examples compile.

samples/languages/java/docker/README.md

@@ -10,3 +10,6 @@ docker run -it --rm -v ${PWD}/..:/examples -w /examples java-tensorflow
 That second command will pop you into a shell which has all
 the dependencies required to execute the scripts and Java
 examples.
+
+The script `sanity_test.sh` builds this container and runs a compilation
+check on all the maven projects.

samples/languages/java/docker/sanity_test.sh

+#!/bin/bash
+#
+# Silly sanity test
+DIR="$(cd "$(dirname "$0")" && pwd -P)"
+
+docker build -t java-tensorflow .
+docker run -it --rm -v ${PWD}/..:/examples java-tensorflow bash /examples/docker/test_inside_container.sh

samples/languages/java/docker/test_inside_container.sh

+#!/bin/bash
+
+set -ex
+
+cd /examples/label_image
+mvn compile
+
+cd /examples/object_detection
+mvn compile
+
+cd /examples/training
+mvn compile