Logstash doesn't install plugin from local gem

I need to use logstash-output-jdbc with some modification, so I've done the following steps:
I've cloned logstash-output-jdbc plugin.
I've done changes to the code in jdbc.rb and built a gem using:
gem build logstash-output-jdbc.gemspec
Now I tried to install it to logstash using:
./logstash-plugin install logstash-output-jdbc-5.3.0-java.gem
(I was in the bin directory of logstash and put the gem there)
Got the following output:
Validating logstash-output-jdbc-5.3.0-java.gem
Installing logstash-output-jdbc
Installation successful
Now I ran:
./logstash-plugin list | grep jdbc
And the output is:
No sign for logstash-output-jdbc. What's might be going wrong? Thanks in advance!

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