Added registration of time module to parse Instant objects

application/src/main/java/org/thingsboard/server/service/security/auth/oauth2/CustomOAuth2ClientMapper.java

@@ -17,6 +17,7 @@ package org.thingsboard.server.service.security.auth.oauth2;
 
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.boot.web.client.RestTemplateBuilder;
 import org.springframework.security.oauth2.client.authentication.OAuth2AuthenticationToken;
@@ -29,6 +30,7 @@ import org.thingsboard.server.common.data.oauth2.OAuth2Registration;
 import org.thingsboard.server.dao.oauth2.OAuth2User;
 import org.thingsboard.server.service.security.model.SecurityUser;
 
+import javax.annotation.PostConstruct;
 import javax.servlet.http.HttpServletRequest;
 
 @Service(value = "customOAuth2ClientMapper")
@@ -40,6 +42,15 @@ public class CustomOAuth2ClientMapper extends AbstractOAuth2ClientMapper impleme
 
     private RestTemplateBuilder restTemplateBuilder = new RestTemplateBuilder();
 
+    @PostConstruct
+    public void init() {
+        // Register time module to parse Instant objects.
+        // com.fasterxml.jackson.databind.exc.InvalidDefinitionException:
+        // Java 8 date/time type `java.time.Instant` not supported by default:
+        // add Module "com.fasterxml.jackson.datatype:jackson-datatype-jsr310" to enable handling
+        json.registerModule(new JavaTimeModule());
+    }
+
     @Override
     public SecurityUser getOrCreateUserByClientPrincipal(HttpServletRequest request, OAuth2AuthenticationToken token, String providerAccessToken, OAuth2Registration registration) {
         OAuth2MapperConfig config = registration.getMapperConfig();