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Help please do Rest/API(JSON) in my Spring Boot project

 
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I created a project on Spring Boot. With the help Vaadin 14 UI framework, I create a chat with interface. Everything works perfectly in the program, several people can write chat messages. There remains one task that I can’t realize Only i need to implement all this with Rest/API(JSON)

Application class

ChatMessage class

MainView class

MessageList class

 
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So have you tried creating a REST controller yet? There's a quickstart guide on the Spring website.
 
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