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The Amazon Web Services SDK for Java provides Java APIs for building software on AWS' cost-effective, scalable, and reliable infrastructure products. The AWS Java SDK allows developers to code against APIs for all of Amazon's infrastructure web services (Amazon S3, Amazon EC2, Amazon SQS, Amazon Relational Database Service, Amazon AutoScaling, etc).

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/*
 * Copyright 2012-2014 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file is distributed
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */
package com.amazonaws.auth;

/**
 * AWS credentials provider chain that looks for credentials in this order:
 * 
 *   Environment Variables - AWS_ACCESS_KEY_ID and AWS_SECRET_KEY
 *   Java System Properties - aws.accessKeyId and aws.secretKey
 *   Instance profile credentials delivered through the Amazon EC2 metadata service
 * 
 *
 * @see EnvironmentVariableCredentialsProvider
 * @see SystemPropertiesCredentialsProvider
 * @see InstanceProfileCredentialsProvider
 */
public class DefaultAWSCredentialsProviderChain extends AWSCredentialsProviderChain {
    public DefaultAWSCredentialsProviderChain() {
        super(new EnvironmentVariableCredentialsProvider(),
              new SystemPropertiesCredentialsProvider(),
              new InstanceProfileCredentialsProvider());
    }
}