Question

这里我试图列出可用的实例。但是当我运行代码时，我收到错误消息为＆＃34;无法通过区域提供程序链找到区域。必须在构建器或设置环境中提供显式区域以提供区域。＆＃34;

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;
    }
}

当我尝试从POSTMAN命中此端点时，我收到以下错误

{
    "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"
}

我还在上面添加了以下代码，但仍然从POSTMAN rest客户端收到相同的错误消息。

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

有人可以帮助我吗？感谢..

Answer 1

哪个版本的JAVA AWS SDK？

从Aws SDK 1.11.113开始，setRegion被取消了。

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

所以你需要在AWS Credentials中设置区域，或者你需要使用Method getCurrentRegion（）来获取区域

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

Answer 2

通过使用标准构建器

更改默认的“客户端”构建器，它对我有用

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

AWS Java SDK EC2描述实例会引发错误

2 个答案: