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<!DOCTYPE html>

package com.fullstackreactjava;

@Bean
public WebMvcConfigurer corsConfigurer() {
    return new WebMvcConfigurerAdapter() {
        @Override
        public void addCorsMappings(CorsRegistry registry) {
            registry.addMapping("/-javaconfig").allowedOrigins(
                    "http://localhost:3000");
        }
    };
}

public static void main(String[] args) {
    SpringApplication.run(FullstackreactjavaApplication.class, args);
}

package com.fullstackreactjava.bancodedados;

@Bean
public DataSource dataSource() {
    DriverManagerDataSource dataSource = new DriverManagerDataSource();
    dataSource.setDriverClassName("org.postgresql.Driver");
    dataSource.setUrl("jdbc:postgresql://localhost:5432/ReactJava");
    dataSource.setUsername("postgres");
    dataSource.setPassword("G-u45xTh");
    dataSource.setSchema("react");
    return dataSource;
}

@Bean
public JpaVendorAdapter jpaVendorAdapter() {
    HibernateJpaVendorAdapter adapter = new HibernateJpaVendorAdapter();
    adapter.setDatabase(Database.POSTGRESQL);
    adapter.setShowSql(true);
    adapter.setGenerateDdl(true);
    adapter.setDatabasePlatform("org.hibernate.dialect.PostgreSQL9Dialect");
    adapter.setPrepareConnection(true);
    return adapter;
}

{

import React, { Component } from 'react';

$(document).ready(function() {
$.ajax({
    url: "http://localhost:8080"
}).then(function(data, status, jqxhr) {
   $('.-value').append(data.value);
   $('.-conteudo_banco_dados').append(data.conteudo_banco_dados);
   console.log(data);
   console.log(status);
   console.log(jqxhr);
});