DynamoDBMappingException：沒有HASH鍵的映射 - 儘管我清楚地映射了它

Question

好吧，所以我查看了this post，我查看了this other post。這是我的具體問題：

我有一個簡單的DynamoDB表稱爲「服務器」與單個分區鍵「serverName」。這裏的表格說明：

"table":{ 
    "attributeDefinitions":[{ 
     "attributeName":"serverName","attributeType":"S" 
    }], 
    "tableName":"server", 
    "keySchema":[{ 
     "attributeName":"serverName","keyType":"HASH" 
    }], 
    "tableStatus":"ACTIVE", 
    "creationDateTime":"Jul 29, 2017 12:46:36 PM", 
    "provisionedThroughput":{ 
     "numberOfDecreasesToday":0, 
     "readCapacityUnits":5, 
     "writeCapacityUnits":5 
    } 
} 

我有一個Java表定義，像這樣：

@DynamoDBTable(tableName="server") 
public static class Server { 
    private String serverName; 
    private Room[] rooms; 

    Server() {} 

    Server(String serverName) { 
     this.serverName = serverName; 
     this.setRooms(); 
    } 

    @DynamoDBHashKey(attributeName="serverName") 
    String getServerName() { 
     return serverName; 
    } 
    void setServerName(String serverName) { 
     this.serverName = serverName; 
    } 
    . 
    . 
    . 
} 

您可以在描述我的「服務器名」散列屬性，並在我的表定義見在Java中有@DynamoDBHashKey(attributeName="serverName")。

有人可以幫助我弄清楚爲什麼我仍然越來越...

com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMappingException: Server; no mapping for HASH key 
    at com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapperTableModel.hashKey(DynamoDBMapperTableModel.java:119) ~[aws-java-sdk-dynamodb-1.11.105.jar!/:na] 
    at com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapperTableModel$Builder.build(DynamoDBMapperTableModel.java:449) ~[aws-java-sdk-dynamodb-1.11.105.jar!/:na] 
    at com.amazonaws.services.dynamodbv2.datamodeling.StandardModelFactories$StandardTableFactory.getTable(StandardModelFactories.java:107) ~[aws-java-sdk-dynamodb-1.11.105.jar!/:na] 
    at com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapper.getTableModel(DynamoDBMapper.java:393) ~[aws-java-sdk-dynamodb-1.11.105.jar!/:na] 
    at com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapper.load(DynamoDBMapper.java:431) ~[aws-java-sdk-dynamodb-1.11.105.jar!/:na] 
    at com.amazonaws.services.dynamodbv2.datamodeling.AbstractDynamoDBMapper.load(AbstractDynamoDBMapper.java:80) ~[aws-java-sdk-dynamodb-1.11.105.jar!/:na] 
    at com.animationlibationstudios.channel.inventory.persist.dynamodb.ServerDynamoRepository.readServer(ServerDynamoRepository.java:110) ~[classes!/:na] 
    at com.animationlibationstudios.channel.inventory.persist.dynamodb.ServerDynamoRepository.readServer(ServerDynamoRepository.java:26) ~[classes!/:na] 

（我使用JDK 8和com.amazonaws PS：AWS-Java的SDK-dynamodb：1.11 .105）

Answer 1

UPDATE

你 「getServerName」 的方法是不公開的和DynamoDBMapper蹣跚而行了。把它公開，它應該工作：

@DynamoDBHashKey(attributeName="serverName") 
public String getServerName() { 
    return serverName; 
} 

原來的答案：

確保您已經創建的表與具有「servername」用作相同類型的分區鍵適當的分區鍵定義。

這裏是如何做到這一點：

DynamoDBMapper dynamoDBMapper = new DynamoDBMapper(dynamoDB); 
CreateTableRequest createTableRequest = dynamoDBMapper.generateCreateTableRequest(itemClass); 
// Set your throughput here 
createTableRequest.withProvisionedThroughput(new ProvisionedThroughput(1L, 1L)); 

dynamoDB.createTable(createTableRequest);