How to pass aws dynamodb table name dynamically using @DynamoDbTable annotation

I have created a java service to get the details from dynamodb it is working fine but my challenge is i hardcoded the table name to the class file @DynamoDbTable annotation in order to work with different environments i feel it is not the right way. I have given my code below could someone help me to resolve the issue.

Code sample

public class DynamodbService {
private DynamoDB client;
private DynamoDBMapper objectMapper;
/**
* 
* @param client
* @param objectMapper
*/
@Autowired
public DynamodbService(DynamoDB client, DynamoDBMapper objectMapper) {
this.client = client;
this.objectMapper = objectMapper;
}
public List<Dynamodb> findAll() throws Exception {
DynamoDBMapperConfig mapperConfig = new DynamoDBMapperConfig.Builder()
.withTableNameOverride(DynamoDBMapperConfig.TableNameOverride.withTableNameReplacement(""))
.build();
DynamoDBMapper mapper = new DynamoDBMapper(client, mapperConfig);
DynamoDBScanExpression scanExpression = new DynamoDBScanExpression();
List<Dynamodb> scanResult = objectMapper.scan(Dynamodb.class, scanExpression);
return scanResult;
}
}

My DynamoDB config

@Configuration
public class DynamoDBconfig {
/**
* 
*/
@Value("${amazon.dynamodb.accesskey}")
private String awsAccessKey;
/**
* 
*/
@Value("${amazon.dynamodb.secretkey}")
private String awsSecretKey;
@Bean
public AWSCredentials amazonAWSCredentials() {
return new BasicAWSCredentials(aes.getDecryptedvalue(awsAccessKey), aes.getDecryptedvalue(awsSecretKey));
}
/**
* 
* @return
*/
@Bean
public DynamoDBMapperConfig dynamoDBMapperConfig() {
return DynamoDBMapperConfig.DEFAULT;
}
/**
* 
* @param amazonDynamoDB
* @param config
* @return
*/
@Bean
public DynamoDBMapper dynamoDBMapper(AmazonDynamoDB amazonDynamoDB, DynamoDBMapperConfig config) {
return new DynamoDBMapper(amazonDynamoDB, config);
}
/**
* 
* @return
*/
@Bean
public AmazonDynamoDB amazonDynamoDB() {
return AmazonDynamoDBClientBuilder.standard().withCredentials(amazonAWSCredentialsProvider())
.withRegion(Regions.US_EAST_2).build();
}
/**
* 
* @return
*/
@Bean
public DynamoDB dynamoDB() {
return new DynamoDB(amazonDynamoDB());
}
/**
* 
* @return
*/
public AWSCredentialsProvider amazonAWSCredentialsProvider() {
return new AWSStaticCredentialsProvider(amazonAWSCredentials());
}
}

ERROR in my dynamodb service

> The constructor DynamoDBMapper(DynamoDB, DynamoDBMapperConfig) is undefined

I am unable find out what is the issue. If i use table name in class file it's working fine if i try to replace the table name using code it ends up with error.

DynamoDBMapper expects any implementation of AmazonDynamoDB but not DynamoDB class.

public DynamoDBMapper(
            final AmazonDynamoDB dynamoDB,
            final DynamoDBMapperConfig config) {

You need to inject only the DynamoDBMapper in your service.

@Bean
public DynamoDBMapper dynamoDBMapper(AmazonDynamoDB amazonDynamoDB) {
  DynamoDBMapperConfig config = new DynamoDBMapperConfig.Builder().withTableNameOverride(TableNameOverride.withTableNameReplacement(tableName))
        .build();
   return new DynamoDBMapper(amazonDynamoDB, config);
}

Other option could be using com.amazonaws.services.dynamodbv2.document.DynamoDB class but there you could not use DynamoDBScanExpression and you need to rewrite your code.

String desiredTabledName = "table-name";
Table table = dynamoDB.getTable(desiredTabledName);


You have multiple options.

 - table.scan() and table query.
 - Index index = table.getIndex(indexName);
   index.scan() or index.query()
 - You could pass `QuerySpec` and `ScanSpec` to all above.