init token, in case job async execute

brave-spring-boot-starter/src/main/java/cn/quantgroup/tech/brave/job/TokenJob.java

@@ -14,6 +14,7 @@ import org.springframework.scheduling.annotation.EnableScheduling;
 import org.springframework.scheduling.annotation.Scheduled;
 import org.springframework.web.client.RestTemplate;
 
+import javax.annotation.PostConstruct;
 import javax.annotation.Resource;
 import java.util.Base64;
 import java.util.Map;
@@ -49,7 +50,7 @@ public class TokenJob {
         return techRestTemplateBuilder.createRestTemplate();
     }
 
-    @Scheduled(fixedRate = 1000 * 60 * 30)
+    @Scheduled(cron = "0 */30 * * * ?")
     public void getToken() {
         HttpHeaders requestHeaders = new HttpHeaders();
         requestHeaders.add(CREDENTIAL, base64ForCredential());
@@ -66,4 +67,9 @@ public class TokenJob {
         String credential = clientId + ":" + secret;
         return Base64.getEncoder().encodeToString(credential.getBytes());
     }
+
+    @PostConstruct
+    public void init() {
+        getToken();
+    }
 }