Travis: Use openjdk9, oraclejdk9, openjdk8

[olleolleolle]

This PR configures Travis build settings. 🛠️

Background

Example of failed build: https://travis-ci.org/github/mkristian/jbundler/jobs/642414727

I began, by appointing jdk values which exist.

Solution

Try to use JDKs existing in Travis CI. ❓ I don't know which of these will be fine.

Also: Drop unused sudo: false directive.

jdk	result	time to result
openjdk9	can install, fails the Maven job	1min30s
oraclejdk9	can install, fails the Maven job	33s
openjdk8	can install	38 min (3 retries which failed)

$ ./mvnw install -DskipTests=true -Dmaven.javadoc.skip=true -B -V

Downloading https://repo1.maven.org/maven2/org/apache/maven/apache-maven/3.3.1/apache-maven-3.3.1-bin.zip

........................................................................................................................................................................................................................................................................................................................................................................................................................

Unzipping /home/travis/.m2/wrapper/dists/apache-maven-3.3.1-bin/22bc38rir9hjukbpmqefdsp306/apache-maven-3.3.1-bin.zip to /home/travis/.m2/wrapper/dists/apache-maven-3.3.1-bin/22bc38rir9hjukbpmqefdsp306

Set executable permissions for: /home/travis/.m2/wrapper/dists/apache-maven-3.3.1-bin/22bc38rir9hjukbpmqefdsp306/apache-maven-3.3.1/bin/mvn

Apache Maven 3.3.1 (cab6659f9874fa96462afef40fcf6bc033d58c1c; 2015-03-13T20:10:27+00:00)

Maven home: /home/travis/.m2/wrapper/dists/apache-maven-3.3.1-bin/22bc38rir9hjukbpmqefdsp306/apache-maven-3.3.1

Java version: 9.0.4, vendor: Oracle Corporation

Java home: /home/travis/oraclejdk9

Default locale: en_US, platform encoding: UTF-8

OS name: "linux", version: "4.15.0-1055-gcp", arch: "amd64", family: "unix"

[INFO] Downloading: https://maven-central.storage-download.googleapis.com/maven2/io/takari/polyglot/polyglot-ruby/0.4.4/polyglot-ruby-0.4.4.pom

[WARNING] Failed to read extensions descriptor /home/travis/build/mkristian/jbundler/.mvn/extensions.xml: Plugin io.takari.polyglot:polyglot-ruby:0.4.4 or one of its dependencies could not be resolved: Failed to read artifact descriptor for io.takari.polyglot:polyglot-ruby:jar:0.4.4

[INFO] Scanning for projects...

[INFO] ------------------------------------------------------------------------

[INFO] BUILD FAILURE

[INFO] ------------------------------------------------------------------------

[INFO] Total time: 0.080 s

[INFO] Finished at: 2020-04-09T20:21:29+00:00

[INFO] Final Memory: 12M/41M

[INFO] ------------------------------------------------------------------------

[ERROR] The goal you specified requires a project to execute but there is no POM in this directory (/home/travis/build/mkristian/jbundler). Please verify you invoked Maven from the correct directory. -> [Help 1]

[ERROR]

[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.

[ERROR] Re-run Maven using the -X switch to enable full debug logging.

[ERROR]

[ERROR] For more information about the errors and possible solutions, please read the following articles:

[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MissingProjectException

oraclejdk9 failure

INFO] -------------------------------------------------

[INFO] Build Summary:

[INFO]   Passed: 3, Failed: 3, Errors: 0, Skipped: 0

[INFO] -------------------------------------------------

[ERROR] The following builds failed:

[ERROR] *  lock_down/pom.xml

[ERROR] *  gemspec_with_system_jar_and_provided_jar/pom.xml

[ERROR] *  running_rspec_via_rake/pom.xml

[INFO] -------------------------------------------------

[INFO] ------------------------------------------------------------------------

[INFO] BUILD FAILURE

[INFO] ------------------------------------------------------------------------

[INFO] Total time: 03:11 min

[INFO] Finished at: 2020-04-09T20:56:23+00:00

[INFO] Final Memory: 39M/347M

[INFO] ------------------------------------------------------------------------

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-invoker-plugin:1.8:run (integration-test) on project jbundler: 3 builds failed. See console output above for details. -> [Help 1]

[ERROR] 

[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.

[ERROR] Re-run Maven using the -X switch to enable full debug logging.

[ERROR] 

[ERROR] For more information about the errors and possible solutions, please read the following articles:

[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException

openjdk8 failure

[olleolleolle]

Oh, this has rotted on the vine, Travis CI needs replacing.

Perhaps a GitHub Actions CI would be OK?