tomcat | open source implementation of the Java Servlet | Continuous Deployment library

Been trying for days to fix this problem. Just trying to recreate a simple "Hello World" REST api with Jersey 3 and Tomcat 10 in maven. After creating the WAR file of the project I can access the index.jsp (created by default when I created the project) but when I try to access the "/helloworld" endpoint I get error 404. Here's my code:

pom.xml

Dears, I have a jersey - spring api deployed on apache tomcat 9.0.46. (Jersey to handle restful services JAX-RS and Spring to handle all my beans{controllers, DAO, SessionFactory, JPA etc...}). Everything works fine on tomcat 9 on windows... When deploying the exact same war in ubuntu tomcat 9.0.46, the ContextLoader is getting triggered 3 times and I have all my singletons instantiated 3 times. I'm deploying the api on tomcat ports 80 and 443 (https - godady certificate). once I start tomcat the war is deployed and ports 80 and 443 get started (netstat -tulnp | grep java) and I see in log all singletons instantiated. (pool-2) Applicationcontext class my custom spring @Configuration class and it is getting triggered and DB is accessed without any issues

Without spring boot ,we must specify the detail of a data source,right?

Im trying to deploy a java web app to heroku, I did all their steps from https://devcenter.heroku.com/articles/deploying-java-applications-with-the-heroku-maven-plugin, but when I try to open a page where I have data from db I am getting:

I have a raspberry pi 4 running a tomcat server hosting my website. Right now it's blank, and I wanted to do connection tests on it before starting to build it. I am doing this to keep costs minimal and to be able to do other things with it later. However, as you can see in this image, I thought this was the way to set it up, but I get a 522 every time I try to connect to it. (I have IP blurred as it is my home IP). But, when I connect to the IP address directly, even through another wifi network, the page loads. Cloudflare has worked in the past when I was hosting on Google Firebase for a little bit, but once I switched to the pi, it stopped.

Thanks in advance for help.

dispatcher-servlet.xml

What does the -D stand for when setting VM settings in Eclipse and ItelliJ?

Is there a way to increase the connectionTimeout for Tomcat in IntelliJ?

I have updated my Eclipse to 2021-03 with jdk1.8 and Tomcat 9. Now when I open a html the following css has an error on ". {" - identifier expected. When I close the file the error marker goes away.

I'm getting this error because one of the fields in my domain class is a LocalDate. Stack trace below. Jackson is complaining about Java 8 date/time not being supported by default, but Spring Boot 2.5 comes with com.fasterxml.jackson.datatype:jackson-datatype-jsr310. How do I get Spring Batch to support my LocalDate field in my domain class?

If I change the field to be a java.util.Date it works perfectly.

Thanks!