HTTP Status 400 - Required String parameter 'walletName' is not present

Edit

In your Postman request, instead of sending JSON, send the values as x-www-form-urlencoded.

Your controller is expecting 2 request parameters that normally look like this: /someurl?walletName=my-wallets-name&currencyName=dollars.

You're sending a json string in the post body, but no formal parameters. You need to update either your POST, or your controller to make the two ends agree. I think you probably want to replace the two @RequestParam annotated Strings, with a Java pojo that has two String members: walletName and currencyName, drop that pojo in your request method as an argument and precede it with the annotation @RequestBody. This will match your json post.

To have your controller accept the post with JSON in the body edit it like this:

@RequestMapping(value = "/generateAddress", method = RequestMethod.POST)
public ResponseEntity<WalletInfoWrapper> generateAddress(@RequestBody
    WalletWithMoneyRequest myJsonRequestComingIn) {
    logger.info("walletName {} and currencyName {}", myJsonRequestComingIn.getWalletName(), myJsonRequestComingIn.getCurrencyName());

And your pojo

public class WalletWithMoneyRequest{ 

    private String walletName;
    private String currencyName;

    //getters and setters down here.