CarRental | Car rental management website based on php as a backend | Content Management System library

I have a spring-boot project called carrental-crud with an h2 memory database, and I want to access one of the endpoints from another project called carrental-api.

I use webClientBuilder for this on my other endpoints, but it is throwing status 500 with bad request when I try using it in postman.

I use JPArepository to access the h2 db with a query, this is how my orderRepository looks :

I have two API:s , CarRental-API on port 8080 and CarRental-CRUD on port 8081.

CarRental-CRUD uses JpaRepository to access a h2 memory DB.

I want to use CarRental-API to make requests to CarRental-CRUD, using webclient.

In CarRental-CRUD , I can make post requests and add cars to the db using this service:

I want to update the counter of available cars whenever someone rents the car. When I try to access this variable through child class, it shows an error as "UnboundLocalError: local variable 'available_cars' referenced before assignment"

PS: Still working on it, that's why I haven't completed all the method codes.

Parent Class

available_cars = 1000

class Car_rental():

I have few service number stored in firestore database as field-values.I have given auto-id while creating the document.I need to check if a particular service value exists in database.I am new to nodejs and firestore .I tried with the below code for checking if document exists.Is there any way to check for a field-value without specifying the document name? Please find the screenshot of the database below.

I am new to using application.properties and am struggling because Environment is always null. I have followed numerous examples such as the accepted answer shown on SO HERE; however, I keep getting the error message showing below. This is a Spring application and I know I don't actually need to go through this manual process per the article HERE. However, I have to show how to connect manually using the properties file. Where am I going wrong? Effectively, I want to hide my database credentials in application.properties and then read them into something like DriverManager.getConnection(env.getProperty("URL"), env.getProperty("USERNAME", env.getProperty("PASSWORD");

Attempting to use Environment:

I'm working with Angular and I'm trying to use Redux to implement JWT authentication and authorization in my project but the "Store.ts" throws an error that states the following:

I'm using Maven project with JSP + Servlets.

In Main class I'm connecting via:

I get the console message below when running my application but every time I navigate to http://localhost:8080/? I get an error message saying:

"Whitelabel Error Page This application has no explicit mapping for /error, so you are seeing this as a fallback.

Tue Jan 12 22:04:40 EST 2021 There was an unexpected error (type=Not Found, status=404)"

Console Output:

I cannot return List from webform async method via Postman. It just goes forever. Am I missing something very tricky here?

Pageload: