CODEWITHSUNDEEP
javaspringtomcatweb
Drogba
Drogba

Reputation: 4346

How to implement a console command line for tomcat web application?

I have a web application

I want to implement a command line function for tomcat console window, to read commands and perform some action or output some information to console. How can I do it?

Example: type "show memory", then display JVM memory information to console.

Can I do it just by System.in? Will there be any thread-safe problem?

Upvotes: 1

Views: 295

Answers (1)

Olaf Kock
Olaf Kock

Reputation: 48057

If you're running as a web application in Tomcat, you won't get any access to System.in or the console: Tomcat is typically started in the background, detached from all consoles. And it won't provide you witn meaningful access to the console.

The way to go is to either provide a REST API as suggested by @rlegendi in the comments (any other API would work as well) and write a separate command line application that interfaces with your API. Alternatively utilize the "manager" interface - if I remember correctly from ancient past, tomcat's manager application also has some usable methods to access from external scripts.

Make sure to make those calls authenticated - at least validate that they're coming from localhost so that you simulate some kind of security in the API. Don't trust random calls coming in from the world.

Upvotes: 1

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