Spring-Boot-Jersey Setup CORS

I fixed it this way,First create a class

public class CORSResponseFilter implements   ContainerResponseFilter {   public void filter(ContainerRequestContext  requestContext,ContainerResponseContext responseContext)            throws IOException {        MultivaluedMap<String, Object> headers = responseContext.getHeaders();        headers.add("Access-Control-Allow-Origin", "*");        //headers.add("Access-Control-Allow-Origin", "http://abcd.org"); //allows CORS requests only coming from abcd.org        headers.add("Access-Control-Allow-Methods", "GET, POST, DELETE, PUT");        headers.add("Access-Control-Allow-Headers", "X-Requested-With, Content-Type, X-Codingpedia");    }}

The filter must inherit from the ContainerResponseFilter interface and must be registered as a provider:

public class JerseyConfig extends ResourceConfig {    public JerseyConfig() {        register(CORSResponseFilter.class);        //other registrations    }}

Fixed it by using the CORSFilter displayed in https://spring.io/blog/2015/01/20/the-resource-server-angular-js-and-spring-security-part-iii

@Component@Order(Ordered.HIGHEST_PRECEDENCE)class CorsFilter implements Filter {  void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) {    HttpServletResponse response = (HttpServletResponse) res;    response.setHeader("Access-Control-Allow-Origin", "*");    response.setHeader("Access-Control-Allow-Methods", "POST, PUT, GET, OPTIONS, DELETE");    response.setHeader("Access-Control-Allow-Headers", "x-requested-with");    response.setHeader("Access-Control-Max-Age", "3600");    if (request.getMethod()!='OPTIONS') {      chain.doFilter(req, res);    } else {    }  }  void init(FilterConfig filterConfig) {}  void destroy() {}}

Not sure if the @Provider annotation is supported by Spring. Try replacing the @Provider annotation with Springs @Component and the CORSFilter should extend org.springframework.web.filter.OncePerRequestFilter. This is the Spring way of configuring Filters and this will work for any application server.
You can also configure CORS via the WebMvcConfigurerAdapter, which might be more compact:

@Beanpublic WebMvcConfigurer corsConfigurer() {    return new WebMvcConfigurerAdapter() {        @Override        public void addCorsMappings(CorsRegistry registry) {            registry.addMapping("/**")                    .allowedOrigins("*")                    .allowedHeaders("...") // add headers                    .allowedMethods(".."); // add methods        }    };}

Check out this guide!