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import java.time.LocalTime;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
 
@Configuration
@EnableWebMvc
@EnableScheduling
@ComponentScan({"ru.web.portal.onlinescheduling"})
public class WebConfig extends WebMvcConfigurerAdapter {
 
    @Scheduled(fixedDelay = 3000)
    public void time() {
        System.out.printf("%s\n", LocalTime.now());
    }
 
    public static class MvcWebApplicationInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
 
 
        @Override
        protected Class<?>[] getRootConfigClasses() {
            return new Class[]{WebConfig.class};
        }
 
        @Override
        protected Class<?>[] getServletConfigClasses() {
           //return new Class[]{WebConfig.class};
            return null;
        }
 
        @Override
        protected String[] getServletMappings() {
            return new String[]{"/"};
 
        }
    }
 
}
 

Main.java:14: error: class WebConfig is public, should be declared in a file named WebConfig.java
public class WebConfig extends WebMvcConfigurerAdapter {
       ^
Main.java:2: error: package org.springframework.context.annotation does not exist
import org.springframework.context.annotation.ComponentScan;
                                             ^
Main.java:3: error: package org.springframework.context.annotation does not exist
import org.springframework.context.annotation.Configuration;
                                             ^
Main.java:4: error: package org.springframework.scheduling.annotation does not exist
import org.springframework.scheduling.annotation.EnableScheduling;
                                                ^
Main.java:5: error: package org.springframework.scheduling.annotation does not exist
import org.springframework.scheduling.annotation.Scheduled;
                                                ^
Main.java:6: error: package org.springframework.web.servlet.config.annotation does not exist
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
                                                        ^
Main.java:7: error: package org.springframework.web.servlet.config.annotation does not exist
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
                                                        ^
Main.java:8: error: package org.springframework.web.servlet.support does not exist
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
                                              ^
Main.java:14: error: cannot find symbol
public class WebConfig extends WebMvcConfigurerAdapter {
                               ^
  symbol: class WebMvcConfigurerAdapter
Main.java:10: error: cannot find symbol
@Configuration
 ^
  symbol: class Configuration
Main.java:11: error: cannot find symbol
@EnableWebMvc
 ^
  symbol: class EnableWebMvc
Main.java:12: error: cannot find symbol
@EnableScheduling
 ^
  symbol: class EnableScheduling
Main.java:13: error: cannot find symbol
@ComponentScan({"ru.web.portal.onlinescheduling"})
 ^
  symbol: class ComponentScan
Main.java:21: error: cannot find symbol
    public static class MvcWebApplicationInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
                                                             ^
  symbol:   class AbstractAnnotationConfigDispatcherServletInitializer
  location: class WebConfig
Main.java:16: error: cannot find symbol
    @Scheduled(fixedDelay = 3000)
     ^
  symbol:   class Scheduled
  location: class WebConfig
Main.java:24: error: method does not override or implement a method from a supertype
        @Override
        ^
Main.java:29: error: method does not override or implement a method from a supertype
        @Override
        ^
Main.java:35: error: method does not override or implement a method from a supertype
        @Override
        ^
18 errors

Standard output is empty