AWS Java SDK EC2描述實例拋出錯誤

Question

這裏我試圖列出可用的實例。但是，當我運行代碼時，我收到錯誤消息爲「無法通過區域提供程序鏈查找區域。必須在構建器或安裝環境中提供顯式區域以提供區域。」

import org.springframework.stereotype.Controller; 
import org.springframework.web.bind.annotation.RequestMapping; 
import org.springframework.web.bind.annotation.RequestMethod; 

import com.amazonaws.regions.Region; 
import com.amazonaws.regions.Regions; 
import com.amazonaws.services.ec2.AmazonEC2; 
import com.amazonaws.services.ec2.AmazonEC2ClientBuilder; 
import com.amazonaws.services.ec2.model.DescribeInstancesRequest; 
import com.amazonaws.services.ec2.model.DescribeInstancesResult; 
import com.amazonaws.services.ec2.model.Instance; 
import com.amazonaws.services.ec2.model.Reservation; 
@Controller 
public class EC2InstancesController { 

@RequestMapping(value="/getAllInstances", produces = {"application/json"}, 
      consumes = {"application/json"}, method = RequestMethod.GET) 
    public List<Instance> getAllInstances(){ 

     final AmazonEC2 ec2 = AmazonEC2ClientBuilder.defaultClient(); 

     boolean done = false; 

     while(!done) { 
      DescribeInstancesRequest request = new DescribeInstancesRequest(); 

      DescribeInstancesResult response = ec2.describeInstances(request); 

      for(Reservation reservation : response.getReservations()) { 
       for(Instance instance : reservation.getInstances()) { 
        System.out.printf(
         "Found reservation with id %s, " + 
         "AMI %s, " + 
         "type %s, " + 
         "state %s " + 
         "and monitoring state %s", 
         instance.getInstanceId(), 
         instance.getImageId(), 
         instance.getInstanceType(), 
         instance.getState().getName(), 
         instance.getMonitoring().getState()); 
       } 
      } 
      request.setNextToken(response.getNextToken()); 

      if(response.getNextToken() == null) { 
       done = true; 
      } 
     } 
     return null; 
    } 
} 

當我試着打從郵遞員端點我收到以下錯誤

{ 
    "timestamp": 1498107927641, 
    "status": 500, 
    "error": "Internal Server Error", 
    "exception": "com.amazonaws.SdkClientException", 
    "message": "Unable to find a region via the region provider chain. Must provide an explicit region in the builder or setup environment to supply a region.", 
    "path": "/getAllInstances" 
} 

我還添加以下代碼在上面，但還是從郵差其餘客戶端收到同樣的錯誤信息。

Region region = Region.getRegion(Regions.US_EAST_1); 
     ec2.setRegion(region); 

有人可以幫我解決這個問題。謝謝..

Answer 1

哪個版本的JAVA AWS SDK？

從Aws SDK 1.11.113 setRegion被取消。

https://aws.amazon.com/blogs/developer/client-constructors-now-deprecated/

因此，你需要在AWS憑據設置區域或需要使用方法getCurrentRegion（）來獲取區域

裁判：http://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/regions/Regions.html

Answer 2

它爲我通過更改默認客戶端生成器使用標準構建器，

final AmazonEC2 ec2 = AmazonEC2ClientBuilder.standard().withRegion(Regions.AP_SOUTH_1).build();