Issue: Cannot successfully run BuildTools.jar on Debian Stretch server due to "the default keystore type changed from 'jks' to 'pkcs12'".  See simple solution below (e.g. Please add export line to the guide:  https://www.spigotmc.org/wiki/buildtools/#linux

To get BuildTools.jar to run successfully;

$ git config --global --unset core.autocrlf
$ export _JAVA_OPTIONS="-Djavax.net.ssl.trustStorePassword=changeit"
$ java -jar BuildTools.jar

The solution above was based on information from;
https://stackoverflow.com/questions/6784463/error-trustanchors-parameter-must-be-non-empty
https://bugs.launchpad.net/ubuntu/+source/ca-certificates-java/+bug/1771363

Error message I received without the above export statement;

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$ java -jar BuildTools.jar
Loading BuildTools version: git-BuildTools-6fc608d-96 (#96)
Java Version: Java 11
git version 2.11.0
Git name not set, setting it to default value.
Git email not set, setting it to default value.
Starting clone of https://hub.spigotmc.org/stash/scm/spigot/bukkit.git to Bukkit
Exception in thread "main" org.eclipse.jgit.api.errors.TransportException: https://hub.spigotmc.org/stash/scm/spigot/bukkit.git: cannot open git-upload-pack
at org.eclipse.jgit.api.FetchCommand.call(FetchCommand.java:135)

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