我想使用Java在Ec2实例上访问Dynamodb。此Ec2实例已被授予IAM角色，通过它我可以使用aws CLI直接访问Dynamodb：aws dynamodb list-table。现在，我尝试通过Java访问Dynamodb。Java代码应该可以担当角色，但是没有用。
public static void main(String[] args) throws Exception {
String ROLE_ARN = "arn:aws:iam::....";
AWSSecurityTokenServiceClient stsClient = new AWSSecurityTokenServiceClient();
AssumeRoleRequest assumeRequest = new AssumeRoleRequest()
.withRoleArn(ROLE_ARN)
.withDurationSeconds(3600)
.withRoleSessionName("demo");
AssumeRoleResult assumeResult = stsClient.assumeRole(assumeRequest);
BasicSessionCredentials temporaryCredentials = new BasicSessionCredentials(
assumeResult.getCredentials().getAccessKeyId(),
assumeResult.getCredentials().getSecretAccessKey(),
assumeResult.getCredentials().getSessionToken());
AmazonDynamoDBClient client = new AmazonDynamoDBClient(temporaryCredentials)
DynamoDB dynamoDB = new DynamoDB(client);
TableCollection<ListTablesResult> tables = dynamoDB.listTables();
Iterator<Table> iterator_t = tables.iterator();
System.out.println("Listing table names");
while (iterator_t.hasNext()) {
Table table = iterator_t.next();
System.out.println(table.getTableName());
}
}
当我在ec2实例上运行代码时，我得到了
Exception in thread "main" com.amazonaws.services.securitytoken.model.AWSSecurityTokenServiceException: Not authorized to perform sts:AssumeRole (Service: AWSSecurityTokenService; Status Code: 403; Error Code: AccessDenied; Request ID: 60313562-d462-11e6-a116-5bf8bb6a59ce)
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.handleErrorResponse(AmazonHttpClient.java:1586)
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeOneRequest(AmazonHttpClient.java:1254)
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeHelper(AmazonHttpClient.java:1035)
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.doExecute(AmazonHttpClient.java:747)
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeWithTimer(AmazonHttpClient.java:721)
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.execute(AmazonHttpClient.java:704)
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.access$500(AmazonHttpClient.java:672)
at com.amazonaws.http.AmazonHttpClient$RequestExecutionBuilderImpl.execute(AmazonHttpClient.java:654)
at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:518)
at com.amazonaws.services.securitytoken.AWSSecurityTokenServiceClient.doInvoke(AWSSecurityTokenServiceClient.java:1188)
at com.amazonaws.services.securitytoken.AWSSecurityTokenServiceClient.invoke(AWSSecurityTokenServiceClient.java:1164)
at com.amazonaws.services.securitytoken.AWSSecurityTokenServiceClient.assumeRole(AWSSecurityTokenServiceClient.java:419)
at com.spokeo.dynamo_elas.AccessAwsD.main(AccessAwsD.java:stsClient.assumeRole(assumeRequest))
有人知道如何解决这个问题吗？谢谢。
经过长时间的探索，终于找到了以下解决方案。
AWSCredentialsProvider provider = new InstanceProfileCredentialsProvider();
AWSCredentials credential = provider.getCredentials();
AmazonDynamoDBClient client = new AmazonDynamoDBClient(credential);
client.setRegion(Region.getRegion(Regions.US_WEST_2));
DynamoDB dynamoDB = new DynamoDB(client);
TableCollection<ListTablesResult> tables = dynamoDB.listTables();
另外，还需要正确配置pom.xml中的依赖项以避免冲突，例如com.amazonaws aws-java-sdk 1.11.72
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.2</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.8.5</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.dataformat/jackson-dataformat-cbor -->
<dependency>
<groupId>com.fasterxml.jackson.dataformat</groupId>
<artifactId>jackson-dataformat-cbor</artifactId>
<version>2.8.5</version>
</dependency>
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