Update docker image for Java #69
Merged
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This request updates deprecated Java docker image
java:7-jdk
toopenjdk:9.0.1-11-slim
.I used
openjdk:9.0.1-11-slim
as the latest image.slim
family for smaller size docker images to make CI faster.9.0.1-11-slim
tag because:9
,9.0
,9.0.1
are not appropriate for reproducibility. They can be implicitly replaced with minor released versions.See also: #61