我第一次使用AWS DynamoDB，并且在EC2实例上运行时出现了一些问题。我查看了AWS示例，发现了一个简单的Java CRUD示例。我使用在Java中运行的Eclipse Java Spring Boot和AWS DynamoDB非常快速地工作。我使用静态访问凭证在桌面上运行它。我必须在applications.properties页面中包含“cloud.aws.region.static = us-west-2”。它可以毫无问题地访问基于AWS Cloud的DynamoDB服务。然后我注释掉了“cloud.aws.region.static = us-west-2”并在EC2实例上运行了完全相同的Java Spring-Boot微服务。我遇到了一些错误，但似乎都表明无法访问DynamoDB凭据提供程序链。我知道静态凭证不是出于安全原因推荐的方法，但我不明白为什么这不起作用。有任何想法吗？
申请代码：
package com.belcan;
import java.util.HashMap;
import java.util.Map;
import com.amazonaws.AmazonClientException;
import com.amazonaws.AmazonServiceException;
import com.amazonaws.auth.AWSStaticCredentialsProvider;
import com.amazonaws.auth.BasicAWSCredentials;
import com.amazonaws.services.dynamodbv2.AmazonDynamoDB;
import com.amazonaws.services.dynamodbv2.AmazonDynamoDBClientBuilder;
import com.amazonaws.services.dynamodbv2.model.AttributeDefinition;
import com.amazonaws.services.dynamodbv2.model.AttributeValue;
import com.amazonaws.services.dynamodbv2.model.ComparisonOperator;
import com.amazonaws.services.dynamodbv2.model.Condition;
import com.amazonaws.services.dynamodbv2.model.CreateTableRequest;
import com.amazonaws.services.dynamodbv2.model.DescribeTableRequest;
import com.amazonaws.services.dynamodbv2.model.KeySchemaElement;
import com.amazonaws.services.dynamodbv2.model.KeyType;
import com.amazonaws.services.dynamodbv2.model.ProvisionedThroughput;
import com.amazonaws.services.dynamodbv2.model.PutItemRequest;
import com.amazonaws.services.dynamodbv2.model.PutItemResult;
import com.amazonaws.services.dynamodbv2.model.ScalarAttributeType;
import com.amazonaws.services.dynamodbv2.model.ScanRequest;
import com.amazonaws.services.dynamodbv2.model.ScanResult;
import com.amazonaws.services.dynamodbv2.model.TableDescription;
import com.amazonaws.services.dynamodbv2.util.TableUtils;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class DynamoDbExampleWarApplication {
static String awsaccesskeyid = "bla-bla-bal";
static String awssecretkey = "yadi-yadi-yada";
static AmazonDynamoDB dynamoDB;
public static void init() {
try {
BasicAWSCredentials myCredentials = new BasicAWSCredentials(awsaccesskeyid, awssecretkey);
dynamoDB = AmazonDynamoDBClientBuilder.standard()
.withCredentials(new AWSStaticCredentialsProvider(myCredentials))
.withRegion("us-west-2")
.build();
} catch (Exception e) {
throw new AmazonClientException(
"Init1(): Cannot load the credentials from the credential profiles file. " + toString.e);
}
}
public static void main(String[] args) {
SpringApplication.run(DynamoDbExampleWarApplication.class, args);
// Get Amazon DynamoDB Client
init();
try {
String tableName = "my-favorite-movies-table";
// Create a table with a primary hash key named 'name', which holds a string
CreateTableRequest createTableRequest = new CreateTableRequest().withTableName(tableName)
.withKeySchema(new KeySchemaElement().withAttributeName("name").withKeyType(KeyType.HASH))
.withAttributeDefinitions(new AttributeDefinition().withAttributeName("name").withAttributeType(ScalarAttributeType.S))
.withProvisionedThroughput(new ProvisionedThroughput().withReadCapacityUnits(1L).withWriteCapacityUnits(1L));
// Create table if it does not exist yet
TableUtils.createTableIfNotExists(dynamoDB, createTableRequest);
// wait for the table to move into ACTIVE state
try {
TableUtils.waitUntilActive(dynamoDB, tableName);
} catch (Exception e) {
System.out.println("Table Error");
}
// Describe our new table
DescribeTableRequest describeTableRequest = new DescribeTableRequest().withTableName(tableName);
TableDescription tableDescription = dynamoDB.describeTable(describeTableRequest).getTable();
System.out.println("Table Description: " + tableDescription);
// Add an item
Map<String, AttributeValue> item = newItem("Bill & Ted's Excellent Adventure", 1989, "****", "James", "Sara");
PutItemRequest putItemRequest = new PutItemRequest(tableName, item);
PutItemResult putItemResult = dynamoDB.putItem(putItemRequest);
System.out.println("Result: " + putItemResult);
// Add another item
item = newItem("Airplane", 1980, "*****", "James", "Billy Bob");
putItemRequest = new PutItemRequest(tableName, item);
putItemResult = dynamoDB.putItem(putItemRequest);
System.out.println("Result: " + putItemResult);
// Scan items for movies with a year attribute greater than 1985
HashMap<String, Condition> scanFilter = new HashMap<String, Condition>();
Condition condition = new Condition()
.withComparisonOperator(ComparisonOperator.GT.toString())
.withAttributeValueList(new AttributeValue().withN("1985"));
scanFilter.put("year", condition);
ScanRequest scanRequest = new ScanRequest(tableName).withScanFilter(scanFilter);
ScanResult scanResult = dynamoDB.scan(scanRequest);
System.out.println("Result: " + scanResult);
} catch (AmazonServiceException ase) {
System.out.println("Caught an AmazonServiceException, which means your request made it "
+ "to AWS, but was rejected with an error response for some reason.");
System.out.println("Error Message: " + ase.getMessage());
System.out.println("HTTP Status Code: " + ase.getStatusCode());
System.out.println("AWS Error Code: " + ase.getErrorCode());
System.out.println("Error Type: " + ase.getErrorType());
System.out.println("Request ID: " + ase.getRequestId());
} catch (AmazonClientException ace) {
System.out.println("Caught an AmazonClientException, which means the client encountered "
+ "a serious internal problem while trying to communicate with AWS, "
+ "such as not being able to access the network.");
System.out.println("Error Message: " + ace.getMessage());
}
}
public static Map<String, AttributeValue> newItem(String name, int year, String rating, String... fans) {
Map<String, AttributeValue> item = new HashMap<String, AttributeValue>();
item.put("name", new AttributeValue(name));
item.put("year", new AttributeValue().withN(Integer.toString(year)));
item.put("rating", new AttributeValue(rating));
item.put("fans", new AttributeValue().withSS(fans));
return item;
}
}
这是EC2 Linux错误字符串，
[ec2-user@ip-10-0-0-244 server]$ java -jar DynamoDBExample-war-v001.war
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v1.5.9.RELEASE)
....Deleted a lot of messages to try to keep the message length as short as possible.
2017-12-20 15:03:32.187 INFO 7372 --- [ main] c.belcan.DynamoDbExampleWarApplication : Starting DynamoDbExampleWarApplication on ip-10-0-0-244 with PID 7372 (/home/ec2-user/server/DynamoDBExample-war-v001.war started by ec2-user in /home/ec2-user/server)
2017-12-20 15:03:32.190 INFO 7372 --- [ main] c.belcan.DynamoDbExampleWarApplication : No active profile set, falling back to default profiles: default
2017-12-20 15:03:32.243 INFO 7372 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@30946e09: startup date [Wed Dec 20 15:03:32 UTC 2017]; root of context hierarchy
2017-12-20 15:03:34.568 INFO 7372 --- [ main] o.s.aop.framework.CglibAopProxy : Final method [protected final com.amazonaws.services.s3.model.InitiateMultipartUploadRequest com.amazonaws.services.s3.AmazonS3Client.newInitiateMultipartUploadRequest(com.amazonaws.services.s3.model.UploadObjectRequest)] cannot get proxied via CGLIB: Calls to this method will NOT be routed to the target instance and might lead to
2017-12-20 15:03:36.530 INFO 7372 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@30946e09: startup date [Wed Dec 20 15:03:32 UTC 2017]; root of context hierarchy
2017-12-20 15:03:36.616 INFO 7372 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2017-12-20 15:03:36.618 INFO 7372 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2017-12-20 15:03:36.657 INFO 7372 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-12-20 15:03:36.657 INFO 7372 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-12-20 15:03:36.707 INFO 7372 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-12-20 15:03:36.951 INFO 7372 --- [ main] b.a.s.AuthenticationManagerConfiguration :
Using default security password: 1cadad8f-e5f6-44ed-a2fd-6df59c36010a
2017-12-20 15:03:37.008 INFO 7372 --- [ main] o.s.s.web.DefaultSecurityFilterChain : Creating filter chain: OrRequestMatcher [requestMatchers=[Ant [pattern='/css/**'], Ant [pattern='/js/**'], Ant [pattern='/images/**'], Ant [pattern='/webjars/**'], Ant [pattern='/**/favicon.ico'], Ant [pattern='/error']]], []
2017-12-20 15:03:37.287 INFO 7372 --- [ main] o.s.b.a.e.mvc.EndpointHandlerMapping : Mapped "{[/dump || /dump.json],methods=[GET],produces=[application/vnd.spring-boot.actuator.v1+json || application/json]}" onto public java.lang.Object org.springframework.boot.actuate.endpoint.mvc.EndpointMvcAdapter.invoke()
2017-12-20 15:03:37.289 INFO 7372 --- [ main] o.s.b.a.e.mvc.EndpointHandlerMapping : Mapped "{[/metrics/{name:.*}],methods=[GET],produces=[application/vnd.spring-boot.actuator.v1+json || application/json]}" onto public java.lang.Object org.springframework.boot.actuate.endpoint.mvc.MetricsMvcEndpoint.value(java.lang.String)
2017-12-20 15:03:37.290 INFO 7372 --- [ main] o.s.b.a.e.mvc.EndpointHandlerMapping : Mapped "{[/metrics || /metrics.json],methods=[GET],produces=[application/vnd.spring-boot.actuator.v1+json || application/json]}" onto public java.lang.Object org.springframework.boot.actuate.endpoint.mvc.EndpointMvcAdapter.invoke()
2017-12-20 15:03:37.290 INFO 7372 --- [ main] o.s.b.a.e.mvc.EndpointHandlerMapping : Mapped "{[/configprops || /configprops.json],methods=[GET],produces=[application/vnd.spring-boot.actuator.v1+json || application/json]}" onto public java.lang.Object org.springframework.boot.actuate.endpoint.mvc.EndpointMvcAdapter.invoke()
2017-12-20 15:03:37.291 INFO 7372 --- [ main] o.s.b.a.e.mvc.EndpointHandlerMapping : Mapped "{[/health || /health.json],methods=[GET],produces=[application/vnd.spring-boot.actuator.v1+json || application/json]}" onto public java.lang.Object org.springframework.boot.actuate.endpoint.mvc.HealthMvcEndpoint.invoke(javax.servlet.http.HttpServletRequest,java.security.Principal)
2017-12-20 15:03:37.292 INFO 7372 --- [ main] o.s.b.a.e.mvc.EndpointHandlerMapping : Mapped "{[/beans || /beans.json],methods=[GET],produces=[application/vnd.spring-boot.actuator.v1+json || application/json]}" onto public java.lang.Object org.springframework.boot.actuate.endpoint.mvc.EndpointMvcAdapter.invoke()
2017-12-20 15:03:37.294 INFO 7372 --- [ main] o.s.b.a.e.mvc.EndpointHandlerMapping : Mapped "{[/auditevents || /auditevents.json],methods=[GET],produces=[application/vnd.spring-boot.actuator.v1+json || application/json]}" onto public org.springframework.http.ResponseEntity<?> org.springframework.boot.actuate.endpoint.mvc.AuditEventsMvcEndpoint.findByPrincipalAndAfterAndType(java.lang.String,java.util.Date,java.lang.String)
2017-12-20 15:03:37.297 INFO 7372 --- [ main] o.s.b.a.e.mvc.EndpointHandlerMapping : Mapped "{[/autoconfig || /autoconfig.json],methods=[GET],produces=[application/vnd.spring-boot.actuator.v1+json || application/json]}" onto public java.lang.Object org.springframework.boot.actuate.endpoint.mvc.EndpointMvcAdapter.invoke()
2017-12-20 15:03:37.300 INFO 7372 --- [ main] o.s.b.a.e.mvc.EndpointHandlerMapping : Mapped "{[/loggers/{name:.*}],methods=[GET],produces=[application/vnd.spring-boot.actuator.v1+json || application/json]}" onto public java.lang.Object org.springframework.boot.actuate.endpoint.mvc.LoggersMvcEndpoint.get(java.lang.String)
2017-12-20 15:03:37.300 INFO 7372 --- [ main] o.s.b.a.e.mvc.EndpointHandlerMapping : Mapped "{[/loggers/{name:.*}],methods=[POST],consumes=[application/vnd.spring-boot.actuator.v1+json || application/json],produces=[application/vnd.spring-boot.actuator.v1+json || application/json]}" onto public java.lang.Object org.springframework.boot.actuate.endpoint.mvc.LoggersMvcEndpoint.set(java.lang.String,java.util.Map<java.lang.String, java.lang.String>)
2017-12-20 15:03:37.301 INFO 7372 --- [ main] o.s.b.a.e.mvc.EndpointHandlerMapping : Mapped "{[/loggers || /loggers.json],methods=[GET],produces=[application/vnd.spring-boot.actuator.v1+json || application/json]}" onto public java.lang.Object org.springframework.boot.actuate.endpoint.mvc.EndpointMvcAdapter.invoke()
2017-12-20 15:03:37.301 INFO 7372 --- [ main] o.s.b.a.e.mvc.EndpointHandlerMapping : Mapped "{[/heapdump || /heapdump.json],methods=[GET],produces=[application/octet-stream]}" onto public void org.springframework.boot.actuate.endpoint.mvc.HeapdumpMvcEndpoint.invoke(boolean,javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse) throws java.io.IOException,javax.servlet.ServletException
2017-12-20 15:03:37.302 INFO 7372 --- [ main] o.s.b.a.e.mvc.EndpointHandlerMapping : Mapped "{[/trace || /trace.json],methods=[GET],produces=[application/vnd.spring-boot.actuator.v1+json || application/json]}" onto public java.lang.Object org.springframework.boot.actuate.endpoint.mvc.EndpointMvcAdapter.invoke()
2017-12-20 15:03:37.303 INFO 7372 --- [ main] o.s.b.a.e.mvc.EndpointHandlerMapping : Mapped "{[/mappings || /mappings.json],methods=[GET],produces=[application/vnd.spring-boot.actuator.v1+json || application/json]}" onto public java.lang.Object org.springframework.boot.actuate.endpoint.mvc.EndpointMvcAdapter.invoke()
2017-12-20 15:03:37.310 INFO 7372 --- [ main] o.s.b.a.e.mvc.EndpointHandlerMapping : Mapped "{[/info || /info.json],methods=[GET],produces=[application/vnd.spring-boot.actuator.v1+json || application/json]}" onto public java.lang.Object org.springframework.boot.actuate.endpoint.mvc.EndpointMvcAdapter.invoke()
2017-12-20 15:03:37.313 INFO 7372 --- [ main] o.s.b.a.e.mvc.EndpointHandlerMapping : Mapped "{[/env/{name:.*}],methods=[GET],produces=[application/vnd.spring-boot.actuator.v1+json || application/json]}" onto public java.lang.Object org.springframework.boot.actuate.endpoint.mvc.EnvironmentMvcEndpoint.value(java.lang.String)
2017-12-20 15:03:37.313 INFO 7372 --- [ main] o.s.b.a.e.mvc.EndpointHandlerMapping : Mapped "{[/env || /env.json],methods=[GET],produces=[application/vnd.spring-boot.actuator.v1+json || application/json]}" onto public java.lang.Object org.springframework.boot.actuate.endpoint.mvc.EndpointMvcAdapter.invoke()
2017-12-20 15:03:37.314 INFO 7372 --- [ main] o.s.s.web.DefaultSecurityFilterChain : Creating filter chain: org.springframework.boot.actuate.autoconfigure.ManagementWebSecurityAutoConfiguration$LazyEndpointPathRequestMatcher@5b94b04d, [org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter@8c3b9d, org.springframework.security.web.context.SecurityContextPersistenceFilter@682b2fa, org.springframework.security.web.header.HeaderWriterFilter@3fc2959f, org.springframework.web.filter.CorsFilter@4c39bec8, org.springframework.security.web.authentication.logout.LogoutFilter@477b4cdf, org.springframework.security.web.authentication.www.BasicAuthenticationFilter@3c9754d8, org.springframework.security.web.savedrequest.RequestCacheAwareFilter@7dcf94f8, org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter@662ac478, org.springframework.security.web.authentication.AnonymousAuthenticationFilter@f79e, org.springframework.security.web.session.SessionManagementFilter@6989da5e, org.springframework.security.web.access.ExceptionTranslationFilter@6a78afa0, org.springframework.security.web.access.intercept.FilterSecurityInterceptor@6ed3ccb2]
2017-12-20 15:03:37.317 INFO 7372 --- [ main] o.s.s.web.DefaultSecurityFilterChain : Creating filter chain: OrRequestMatcher [requestMatchers=[Ant [pattern='/**']]], [org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter@3af9c5b7, org.springframework.security.web.context.SecurityContextPersistenceFilter@445b295b, org.springframework.security.web.header.HeaderWriterFilter@2e377400, org.springframework.security.web.authentication.logout.LogoutFilter@757277dc, org.springframework.security.web.authentication.www.BasicAuthenticationFilter@687e99d8, org.springframework.security.web.savedrequest.RequestCacheAwareFilter@49e5f737, org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter@5c671d7f, org.springframework.security.web.authentication.AnonymousAuthenticationFilter@37271612, org.springframework.security.web.session.SessionManagementFilter@1757cd72, org.springframework.security.web.access.ExceptionTranslationFilter@561b6512, org.springframework.security.web.access.intercept.FilterSecurityInterceptor@10aa41f2]
2017-12-20 15:03:37.555 WARN 7372 --- [ main] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.cloud.aws.core.env.ResourceIdResolver.BEAN_NAME': Invocation of init method failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'stackResourceRegistryFactoryBean' defined in class path resource [org/springframework/cloud/aws/autoconfigure/context/ContextStackAutoConfiguration$StackAutoDetectConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.cloud.aws.core.env.stack.config.StackResourceRegistryFactoryBean]: Factory method 'stackResourceRegistryFactoryBean' threw exception; nested exception is com.amazonaws.SdkClientException: Unable to load AWS credentials from any provider in the chain
2017-12-20 15:03:37.556 INFO 7372 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Unregistering JMX-exposed beans on shutdown
2017-12-20 15:03:37.560 INFO 7372 --- [ main] o.apache.catalina.core.StandardService : Stopping service [Tomcat]
2017-12-20 15:03:38.079 INFO 7372 --- [ main] utoConfigurationReportLoggingInitializer :
Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
2017-12-20 15:03:38.086 ERROR 7372 --- [ main] o.s.boot.SpringApplication : Application startup failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.cloud.aws.core.env.ResourceIdResolver.BEAN_NAME': Invocation of init method failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'stackResourceRegistryFactoryBean' defined in class path resource [org/springframework/cloud/aws/autoconfigure/context/ContextStackAutoConfiguration$StackAutoDetectConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.cloud.aws.core.env.stack.config.StackResourceRegistryFactoryBean]: Factory method 'stackResourceRegistryFactoryBean' threw exception; nested exception is com.amazonaws.SdkClientException: Unable to load AWS credentials from any provider in the chain
...Lot more lines of error messages but I think you get the picture...
[ec2-user@ip-10-0-0-244 server]$
它看起来不像Dynamo呼叫失败。看起来Spring Cloud AWS失败了。
这是您提供的堆栈跟踪的最后一部分：
Failed to instantiate [org.springframework.cloud.aws.core.env.stack.config.StackResourceRegistryFactoryBean]: Factory method 'stackResourceRegistryFactoryBean' threw exception; nested exception is com.amazonaws.SdkClientException: Unable to load AWS credentials from any provider in the chain
看起来Spring Cloud AWS需要凭据，仅为DynamoDB提供它们是不够的。
如果您不需要，请尝试从依赖项中删除Spring Cloud。