[SAK-32095] Travis to use newer version of oracle jdk vs 1.8.0_31 when building - Sakai

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Look in the travis log to see which version of the JDK used i.e.

$ java -Xmx32m -version java version "1.8.0_111" Java(TM) SE Runtime Environment (build 1.8.0_111-b14) Java HotSpot(TM) 64-Bit Server VM (build 25.111-b14, mixed mode)
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Look in the travis log to see which version of the JDK used i.e. $ java -Xmx32m -version java version "1.8.0_111" Java(TM) SE Runtime Environment (build 1.8.0_111-b14) Java HotSpot(TM) 64-Bit Server VM (build 25.111-b14, mixed mode)

Travis is building with a now aging version of jdk 8 and should use a newer version.

Travis builds with an aging version of jdk 1.8.0_31 from January of 2015 where there have been more than a thousand fixes since then in more recent versions. see https://en.wikipedia.org/wiki/Java_version_history#Java_8_updates for a quick summary.

addons:
  apt:
    packages:
      - oracle-java8-installer

is related to

SAK-38305 Switch travis build from Oracle JDK to Open JDK