xsbt-web-plugin 4.2.4 -> sbt-war 5.0.0-M2

[earldouglas]

We might want to wait for the non-milestone 5.0.0 release, in which case this PR can serve as a placeholder.

sbt-war 5 uses com.heroku:webapp-runner, which uses Tomcat (currently version 10.1.28, which targets the 6.0 servlet spec); would we want to use the Eclipse Jetty runner instead?

[earldouglas]

This might require other documentation updates around the Scalatra ecosystem.

[takezoe]

Yeah, we will work on it once this PR is merged.

[takezoe]

Thank you for raising this. Looks like we need to fix CI😅 Will work on it in another PR.

[takezoe]

@earldouglas CI has been fixed in the master branch. Could you rebase this pull request on it?

would we want to use the Eclipse Jetty runner instead?

In theory, using Tomcat wouldn't be a problem as Scalatra is a pure servlet-based framework which doesn't rely on container specific features.

However, Jetty is used for many purposes in Scalatra, like integration test support, standalone deployment, etc. So, it would be better to use Jetty by default if possible.

[earldouglas]

CI has been fixed in the master branch

Thanks!

it would be better to use Jetty by default if possible

Gotcha. I'll experiment with using Jetty by default instead.

Marking this PR as draft until these are both addressed:

• rebase on scalatra/master
• experiment with Jetty instead of (or in addition to -- perhaps with a config setting) Tomcat as the default container (Replace Tomcat with Jetty in WarRunner earldouglas/sbt-war#979)

[takezoe]

It seems that we have migrated to sbt-war last week: 394f837

However, it doesn't work for some reason. I tried below:

$ sbt new scalatra/scalatra.g8
$ cd <name-of-app>
$ sbt
> warStart

Tomcat launched but 404 is returned for /. No log messages in the console.

cc: @magnolia-k

[magnolia-k]

@takezoe

I tested it on both Linux (Ubuntu 24.4) and macOS 15.2 (both using JDK 21), and I was able to confirm that the screen is displayed at http://localhost:8080.

[takezoe]

I was using Java 11. Switching to Java 17/21 worked. 🙇‍♂️

[takezoe]

@earldouglas While I confirmed sbt-web works, I have some questions about sbt-web to replace xsb-web-plugin.

• How can we see Tomcat and application logs (stdout and stderr)?
• HOw can we restart Tomcat automatically when application code is modified (like ~container:start)?

[earldouglas]

@takezoe These are excellent questions; thanks! I'll answer them in the sbt-war readme, and also copy/link the answers here.

[takezoe]

@earldouglas Thank you! No need to comment here in that case. I will look at READMD of sbt-war.