On 29/09/2023 20:20, Bruno Melloni wrote:
On a tomcat server I have a number of REST services deployed as WARs.
There are interdependencies and even applications on other servers that
call them, so I really don't want to start calling services after
starting Tomcat until every single webapp is fully up and running.
Ideally, I would like to do it*programmatically*.
QUESTIONS
* Is there a REST, other kind of API that I can call or a library that
I can use?
You could check the status of each application via JMX.
* Is there a known best practice on how to accomplish what I am
looking for? Perhaps a third party library that does the job?
Nothing comes to mind.
Things I know I can try, but none is an ideal solution:
* Manually look at the logs.
* Manually look at the Tomcat Application Management page.
* Programmatically call the Tomcat Application Management page and
scrape the information I need from it.
* Scour through the code of the Tomcat Application Management page and
replicate the pieces that I need, for example someone mentioned in a
forum that I can look at
org.apache.catalina.manager.ManagerServlet.isDeployed(String name)
to find out whether a webapp has been deployed or not.
If you are going the bespoke route, I'd suggest a health check / status
endpoint for each app and call them in turn. It could easily be a
standard component you deploy as part of each application.
Mark
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