AWS cannot validate the provided access credentials (eclipse)

I have been working with the AWS SDK for java to start an amazon EC2 instance through a simple java program. I have provided my secret and access key in the code itself, and in windows>preferences>aws sdk also. I've also added my credentials to the key i am using. And I am still getting this error

Exception in thread "main" com.amazonaws.AmazonServiceException: AWS was not able to validate the provided access credentials (Service: AmazonEC2; Status Code: 401; Error Code: AuthFailure; Request ID: cc82e725-5a8a-44d8-9f7c-2031d6db1e1a)
at com.amazonaws.http.AmazonHttpClient.handleErrorResponse(AmazonHttpClient.java:1182)
at com.amazonaws.http.AmazonHttpClient.executeOneRequest(AmazonHttpClient.java:770)
at com.amazonaws.http.AmazonHttpClient.executeHelper(AmazonHttpClient.java:489)
at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:310)
at com.amazonaws.services.ec2.AmazonEC2Client.invoke(AmazonEC2Client.java:11819)
at com.amazonaws.services.ec2.AmazonEC2Client.startInstances(AmazonEC2Client.java:6153)
at amazon.Amazon.main(Amazon.java:53)

Here is my Java Code

 package amazon;

import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.BasicAWSCredentials;
import com.amazonaws.auth.profile.ProfileCredentialsProvider;
import com.amazonaws.regions.Regions;
import com.amazonaws.regions.Region;
import com.amazonaws.services.ec2.AmazonEC2;
import com.amazonaws.services.ec2.AmazonEC2Client;
import com.amazonaws.services.ec2.model.StartInstancesRequest;
import com.amazonaws.services.ec2.model.StartInstancesResult;

public class Amazon 
{
static AmazonEC2 ec2;

    static void authentication() throws Exception {
    AWSCredentials credentials=null;
 credentials = new BasicAWSCredentials("****","****");
 credentials=new ProfileCredentialsProvider().getCredentials();

    System.out.println("Credentials : " + credentials);
    ec2 = new AmazonEC2Client(credentials);
    Region region=Region.getRegion(Regions.AP_SOUTHEAST_1);
    ec2.setRegion(region);

}

  public static void main(String[] args) throws Exception
  {
      authentication(); 
        StartInstancesRequest startInstancesRequest = new StartInstancesRequest();

             startInstancesRequest.withInstanceIds("i-sba78aj1");

   StartInstancesResult res = ec2.startInstances(startInstancesRequest); 
              System.out.println(res.toString());
              return;
      }
}

Can anyone help me out? Thanks in advance.