Avoid jruby warning

.travis.yml

@@ -90,6 +90,8 @@ matrix:
       gemfile: test/gemfiles/Gemfile.rails-5.0.x.erubi
   fast_finish: true
 before_install:
+  # Avoid "Warning: the --client flag is deprecated and has no effect most JVMs"
+  - unset _JAVA_OPTIONS
   # install older versions of rubygems and bundler only on Ruby < 2.7
   - if [ `echo "${TRAVIS_RUBY_VERSION:0:3} < 2.7" | bc` == 1 ]; then gem i rubygems-update -v '<3' && update_rubygems; fi; # https://github.com/travis-ci/travis-ci/issues/8974
   - if [ `echo "${TRAVIS_RUBY_VERSION:0:3} < 2.7" | bc` == 1 ]; then gem uninstall -v '>= 2' -i $(rvm gemdir)@global -ax bundler || true; fi;