JDK8 java executable file not found in $PATH

[chris-fung]

When I used docker image to build my app, I found this error:
1, docker run adoptopenjdk/openjdk8-openj9:alpine java -version
2, C:\Program Files\Docker\Docker\Resources\bin\docker.exe: Error response from daemon: OCI runtime create failed: container_linux.go:348: starting container process caused "exec: "java": executable file not found in $PATH": unknown.

[dinogun]

This is a duplicate of issue #32 and will be fixed by PR #33