Rest API's for Money Transfer between two accounts, implemented in Javalin.

Technology stack

• Java 8
• Maven
• Google Guice for dependency injection
• H2 in memory database
• Maven
• Javalin (with embedded Jetty Server)
• Hand-written in-memory data storage using concurrency utilities
• JUnit 4
• Apache HttpClient (for unit testing)

Main Class

com.mybank.server.App

API URL Routings

All the account related end points routing is done in the class as below path. com.mybank.account.AccountRouting

User API end points routing is done in class com.mybank.user.UserRouting

Guice Module

com.mybank.server.AppModule which is loading the main MyBankModule

How to run

mvn exec:java

Application is running in inbuilt light weight javalin server on localhost port 7000. H2 is a in memory database which has been initialized with some sample user and account data to view

• http://localhost:7000/api/user/test1
• http://localhost:7000/api/user/test2
• http://localhost:7000/api/account/1
• http://localhost:7000/api/account/2

Available Rest API's for Users

HTTP METHOD	END POINT	USAGE
GET	/api/user/all	get all users
POST	/api/user/create	create a new user
PUT	/api/user/{userId}	update user
GET	/api/user/{userId}	get user details by userId
DELETE	/api/user/{userId}	delete user

Available Rest API's for Accounts

HTTP METHOD	END POINT	USAGE
GET	/api/account/{accountId}	get account details by accountId
GET	/api/account/all	get all accounts
GET	/api/account/{accountId}/balance	get account balance details by accountId
POST	/api/account/create	create a new account
DELETE	/api/account/{accountId}	remove account by accountId
PUT	/api/account/{accountId}/withdraw/{amount}	withdraw money from account
PUT	/api/account/changeStatus/{accountId}/{status}	disable/enable the account
PUT	/api/account/{accountId}/deposit/{amount}	deposit money to account
POST	/api/account/transaction	perform transaction between 2 user accounts

Http Status

• 200 OK: Request is ok and processed successfully.
• 400 Bad Request: Unknown parameter in a request which server doesn't know or accept.
• 404 Not Found: The requested resource is not found, or its not available in db.
• 500 Internal Server Error: The server encountered an unexpected condition or exception.

Dummy JSON for User and Account

User :

{  
  "userName":"Munish Bhardwaj",
  "emailAddress":"munish@gmail.com"
} 

User Account: :

{  
   "customerName":"test1",
   "balance":1000.0000,
   "currencyCode":"USD"
} 

Account: :

{  
  	"accountId": 1,
        "accountType": "PERSONAL",
        "customerName": "munish",
        "customerEmail": "munish@test.com",
        "customerAddress": "India",
        "customerMobile": "+918901901200",
        "customerIdProof": "ZVXYZA",
        "customerPassword": XVZA
        "balance": 100.0000,
        "currencyCode": "USD",
        "accountStatus": true
} 

User Transaction:

{  
   "currencyCode":"INR",
   "amount":800000.0000,
   "fromAccountId":1,
   "toAccountId":2
}