To develop scheduling rest client

I am trying to develop scheduling rest client.The task is:

1. There is Rest API
2. I would like to send GET requests on schedule

I created the Spring boot application:

import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplicationpublic class IntegrationApplication {    public static void main(String[] args) throws IOException {        SpringApplication.run(IntegrationApplication.class, args);    }}

I created the scheduler config:

import org.springframework.context.annotation.Configuration;import org.springframework.scheduling.annotation.EnableAsync;import org.springframework.scheduling.annotation.EnableScheduling;import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;@Configuration@EnableScheduling@EnableAsync@ConditionalOnProperty(name = "scheduler.enabled", matchIfMissing = true)public class SchedulerConfig { }

I created java class which send requests to rest API:

import org.springframework.beans.factory.annotation.Value;import org.springframework.stereotype.Component;@Servicepublic class GetAllData {    @Value("${server.url}")    private String serverUrl;    @Value("${security.oauth2.client.clientSecret}")    private String clientSecret;    private static RestClientGetExecute restClientGetExecute;    public void get() {        // Do send request     }}

Finally, I created java class which initiates request sending, as I am expecting:

import org.springframework.scheduling.annotation.Scheduled;import org.springframework.stereotype.Component;import java.time.ZonedDateTime;@Componentpublic class TestEngine {    private static GetAllData getAllData;    @Scheduled(fixedDelay = 2000)    public void getLocalDateTimeFixedDelay() throws InterruptedException {        getAllData.get();    }}

But it doesn't work. The error is:

java.lang.NullPointerException: Cannot invoke GetAllData.get()" because "TestEngine.getAllData" is null

Could you help me please to find out how to run schedule sending requests to REST API?