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I am new to Spring boot websocket and messaging semantics. Currently i am able to send private messages using the below code.

String queueName = "/user/" + username  + "/queue/wishes";
simpMessagingTemplate.convertAndSend(queueName, message);
When trying to use convertAndSendToUser I am not getting any error but the message is not getting sent. I knew that with sendToUser there should be a slight change in how the destination name should be formed but I am not getting it right.
String queueName = "/user/queue/wishes";
simpMessagingTemplate.convertAndSendToUser(username, queueName, message);
Below is my subscription code.
stompClient.subscribe('/user/queue/wishes', function(message) {
    alert(message);
I had a similar problem, if your username is actually a sessionId, then try to use one of the overloaded methods that accept headers (so said in SimpMessageSendingOperations javadoc):
SimpMessageHeaderAccessor headerAccessor = SimpMessageHeaderAccessor.create(SimpMessageType.MESSAGE);
headerAccessor.setSessionId(username);
headerAccessor.setLeaveMutable(true);
messagingTemplate.convertAndSendToUser(username, "/queue/wishes", message, headerAccessor.getMessageHeaders());
my example
It is not getting sent because your "destination" i.e "queuename" is incorrect. 
As you can see here SimpMessagingTemplate.java#L230 this is the method that gets invoked as a part of the chain on invocations of template.convertAndSendToUser(). 
This method already prefixes /user to the final destination. So instead you should do something like this:
simpMessagingTemplate.convertAndSendToUser(username,"/queue/wishes", message);
Now with the correct destination it should get sent to user. 
                No. It's still not working. I ended up adding "/user" to the destination after initially, it didn't work with "/queue/wishes" destination.
– Harsha
                Jun 21, 2020 at 5:17
You must registry the prefix of SimpleBroker:
@Override
public void configureMessageBroker(MessageBrokerRegistry registry) {
    registry.setApplicationDestinationPrefixes("/app");
    registry.enableSimpleBroker("/topic", "/queue", "/user");
    registry.setUserDestinationPrefix("/user");
Although the UserDestinationPrefix has been set for default value "/user/", you must to add the SimpleBroker prefix.
        
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