This application serves as an example for the GitHub issue Cannot Stop Application Once It Is Started. The problem of the application is that it cannot be stopped once it is started. See the full details in the linked GitHub issue.
The application connects to Twitter's Filtered Stream API. This API requires a Bearer token which can be retrieved after registration via this URL. Add your token to the file application.properties.
Start the application (dev mode and production mode seem to have the same issue). Usually, stopping the application
should be possible via Ctrl + C. However, it continues to run. To see that the application continues to run, even
after closing the terminal, you can see the Tweet counter on
the Twitter Development Portal going up.
To simplify the process of stopping the application, you can start it via your IDE (I use IntelliJ). To stop it, you have to press the stop button twice.
TwitterListener can be considered as the main class. It performs a few steps:
- Get the existing rules which are stored at Twitter's side. The rules specify which Tweets to pull from Twitter.
- Delete the existing rules from Twitter's side.
- Create the in the source code defined rules at Twitter's side.
- Connect to the Filtered Stream to read the text of the Tweets which match the rules and log them.
If I remove the fourth step, i.e. do not let the app connect to the stream and consume it, everything works.