Home/ Questions/Q 7169011
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-28T14:53:55+00:00

I’m trying to start a Amazon EC2 cloud machine with [startInstance][2] method using aws-sdk

  • 0

I’m trying to start a Amazon EC2 cloud machine with [startInstance][2] method using aws-sdk in Java. My code is as follows.

public String startInstance(String instanceId) throws Exception {
    List<String> instanceIds = new ArrayList<String>();
    instanceIds.add(instanceId);

    StartInstancesRequest startRequest = new StartInstancesRequest(
            instanceIds);
    startRequest.setRequestCredentials(getCredentials());

    StartInstancesResult startResult = ec2.startInstances(startRequest);
    List<InstanceStateChange> stateChangeList = startResult
            .getStartingInstances();
    log.trace("Starting instance '{}':", instanceId);

    // Wait for the instance to be started
    return waitForTransitionCompletion(stateChangeList, "running",
            instanceId);
}

When I run the above code, i’m getting the following AWS error:

Status Code: 400, AWS Request ID: e1bd4795-a609-44d1-9e80-43611e80006b, AWS Erro
r Code: InvalidInstanceID.NotFound, AWS Error Message: The instance ID 'i-2b97ac
2f' does not exist
        at com.amazonaws.http.AmazonHttpClient.handleErrorResponse(AmazonHttpCli
ent.java:538)
        at com.amazonaws.http.AmazonHttpClient.executeHelper(AmazonHttpClient.ja
va:283)
        at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:168
)
        at com.amazonaws.services.ec2.AmazonEC2Client.invoke(AmazonEC2Client.jav
a:5208)
        at com.amazonaws.services.ec2.AmazonEC2Client.startInstances(AmazonEC2Cl
ient.java:2426)
Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    AWS Error Message: The instance ID ‘i-2b97ac2f’ does not exist

    You’ll have to take the AWS response for granted here, i.e. the instance does not exist 😉

    But seriously: Presumably you have already verified that you are actually running an instance with this ID in your account? Then this is most likely caused by targeting the wrong API endpoint, insofar an instance ID is only valid within a specific region (if not specified, the region defaults to ‘us-east-1’, see below).

    In this case you need to specify the actual instance region via the setEndpoint() method of the AmazonEC2Client object within the apparently global ec2 variable before calling startInstances().

    There are some examples regarding Using Regions with the AWS SDKs and all currently available AWS regional endpoint URLs are listed in Regions and Endpoints, specifically the Amazon Elastic Compute Cloud (EC2) defaults to ‘us-east-1’:

    If you just specify the general endpoint (ec2.amazonaws.com), Amazon
    EC2 directs your request to the us-east-1 endpoint.

    • 0