please check out this docs page

https://docs.railway.app/guides/fixing-common-errors

This link does not have anythign related to Java Springboot application

you are correct, but it does cover the issue you are facing and provides a high-level explanation of what needs to be done to solve the issue.

I had deployed another project from GIT 2 months back and did not make any changes in host or port. Is there any changes made to the deployment process recently?

nope, what is outlined in that docs page has always been necessary, that just means your deploy from 2 months back listened on the correct host and port and you have since changed something.

I have the same problem. How you resolve it?

Okay, just add a

for yaml:

server:
port: ${PORT}

or for .properties

for yaml:

server.port: ${PORT}

and don't provide in env properties any port, railway provide him this variable automaticly

yes Railway does provide the PORT variable automatically, you don't need to define it yourself anywhere.