Hi, I just do everything like on https://www.elastic.co/guide/en/logstash/current/java-filter-plugin.html#_copy_the_example_repo_3.
I did not change any code.
But It comes out some error when I try to install the plugin
./bin/logstash-plugin install --no-verify --local ./logstash-filter-java_filter_example-1.0.2.gem
ERROR: Something went wrong when installing ./logstash-filter-java_filter_example-1.0.2.gem, message: undefined method `headers' for #<Net::HTTPFound 302 Found readbody=true>