Migrate to App Engine Java 17 runtime

[slarson]

Summary

• Create new Maven-based project (wormbrowser-appengine) targeting Java 17 runtime
• Migrate servlet from javax.servlet to jakarta.servlet namespace
• Add app.yaml for modern App Engine Java 17 configuration
• Add Jetty plugin for local development testing
• Update README with comprehensive deployment instructions

Why This Change

Google App Engine Java 8 runtime reaches end-of-support on January 31, 2026. This migration upgrades the wormbrowser to the modern Java 17 runtime to ensure continued operation.

Changes

Component	Before	After
Java Version	8	17
Servlet API	javax.servlet 2.5	jakarta.servlet 6.0
Build System	Eclipse/Ant	Maven
App Engine Config	appengine-web.xml	app.yaml
SDK	App Engine SDK 1.8.0	App Engine Maven Plugin 2.5.0

Test plan

• Local build with mvn clean package - SUCCESS
• Local Jetty server test at http://localhost:8080 - SUCCESS
• Servlet endpoint /org_openworm_wormbrowser returns expected message
• Static assets (JS, models, images) served correctly
• Deploy to staging with mvn appengine:deploy -Dapp.deploy.promote=false
• Verify staging at https://java17-v1-dot-wormbrowser-release.appspot.com/
• Promote to production

Deployment Commands

cd wormbrowser-appengine

# Deploy to staging (no traffic)
mvn appengine:deploy -Dapp.deploy.promote=false

# Promote to production once verified
gcloud app services set-traffic default --splits=java17-v1=1 --project=wormbrowser-release

🤖 Generated with Claude Code

[pgleeson]

Thanks @slarson (and mr copilot...). I'll take a look!