When a JSP website is ready to be published, it can be a headache for individuals or students without a budget.
I encountered this problem too. After searching online, I found two helpful blog posts:
Recommending a free JSP hosting service: http://fireinwind.iteye.com/blog/705611

This blog post introduced me to two free JSP hosting options: jhost and EATJ.
Here are my thoughts on using these two free hosting services – free services inevitably have drawbacks. For example, jhost is extremely slow to access from the campus network, and uploading files takes forever. EATJ’s drawback is that it shuts down your server every six hours each day, and you have to restart it manually (shutdown times are 4:00, 10:00, 14:00, 18:00, and 24:00).

So I recommend using EATJ when you don’t have a budget in the early stages. The speed is decent and it works well enough – the only downside is having to restart the server. It is perfectly suitable for testing purposes.

As for jhost, it has a better user experience, designed with a desktop OS-style interface for easier management, but it is slow.

For detailed instructions on how to use these two hosting services, see the blog post:

jsp php enthusiasts’ good news: eatj and jhost

Note: Applying for jhost is somewhat complicated and requires an invitation code. You can search for “jhost invitation code” online.

After activating your account, log in to the hosting backend and activate your Website Hosting Service in the Control Panel.

Site policy: Regular users must log in and renew at least once every 3 days (click the Renew button in the Member Service Management section of the Control Panel) to confirm you are still using the service.
Additionally, the site periodically suspends the TOMCAT service for users who have not renewed within the specified time. The next renewal will restart the service. If you do not renew for over a month, your account will be deactivated.

You can extend your hosting usage period or redeem other services through site credits. Credits can be earned by referring users or purchased with cash. See the site’s help section for details.