無法執行 HTTP 請求 - DynamoDB 本地 Maven 依賴項

Question

根據 Dynamo DB 的文檔，我們也可以通過 Maven 依賴在本地安裝 DynamoDB。 只需在 POM 文件中包含依賴項和存儲庫即可。 用例： https://forums.aws.amazon.com/thread.jspa?threadID=180367

因此，我在 Java 中編寫了一個代碼，它只是創建了一個表，並且我還在 pom 文件中包含了 DynamoDBLocal 依賴項。

Java 代碼：

public void createTable(String tableName) {

        CreateTableRequest request = new CreateTableRequest()
                .withAttributeDefinitions(new AttributeDefinition(
                        "Name", ScalarAttributeType.S))
                .withKeySchema(new KeySchemaElement("Name", KeyType.HASH))
                .withProvisionedThroughput(new ProvisionedThroughput(
                        10L, 10L))
                .withTableName(tableName);

        final AmazonDynamoDB ddb = AmazonDynamoDBClientBuilder.standard()
                .withEndpointConfiguration(new AwsClientBuilder.EndpointConfiguration("http://localhost:8000", "us-west-2"))
                .build();

        try {
            CreateTableResult result = ddb.createTable(request);
            System.out.println(result.getTableDescription().getTableName());
        } catch (AmazonServiceException e) {
            System.err.println(e.getErrorMessage());
            System.exit(1);
        }

pom.xml

<dependencies>
        <dependency>
            <groupId>com.amazonaws</groupId>
            <artifactId>DynamoDBLocal</artifactId>
            <version>[1.12,2.0)</version>
        </dependency>
    </dependencies>
    <!--Custom repository:-->
    <repositories>
        <repository>
            <id>dynamodb-local-oregon</id>
            <name>DynamoDB Local Release Repository</name>
            <url>https://s3-us-west-2.amazonaws.com/dynamodb-local/release</url>
        </repository>
    </repositories>

運行代碼時出現以下錯誤。 有人可以幫我嗎？

Exception in thread "main" com.amazonaws.SdkClientException: Unable to execute HTTP request: Connect to localhost:8000 [localhost/127.0.0.1, localhost/0:0:0:0:0:0:0:1] failed: Connection refused (Connection refused)
    at com.amazonaws.http.AmazonHttpClient$RequestExecutor.handleRetryableException(AmazonHttpClient.java:1207)
    at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeHelper(AmazonHttpClient.java:1153)
    at com.amazonaws.http.AmazonHttpClient$RequestExecutor.doExecute(AmazonHttpClient.java:802)
    at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeWithTimer(AmazonHttpClient.java:770)
    at com.amazonaws.http.AmazonHttpClient$RequestExecutor.execute(AmazonHttpClient.java:744)
    at com.amazonaws.http.AmazonHttpClient$RequestExecutor.access$500(AmazonHttpClient.java:704)
    at com.amazonaws.http.AmazonHttpClient$RequestExecutionBuilderImpl.execute(AmazonHttpClient.java:686)
    at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:550)
    at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:530)
    at com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient.doInvoke(AmazonDynamoDBClient.java:6164)
    at com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient.invoke(AmazonDynamoDBClient.java:6131)
    at com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient.executeCreateTable(AmazonDynamoDBClient.java:1154)
    at com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient.createTable(AmazonDynamoDBClient.java:1119)
    at DynamoDB.createTable(DynamoDB.java:30)
    at main.main(main.java:4)

Answer 1

1. 添加此插件配置。
   這是為了將二進制庫復制到您的目標目錄。

    <dependency>
        <groupId>org.mockito</groupId>
        <artifactId>mockito-core</artifactId>
        <scope>test</scope>
    </dependency>


    <dependency>
        <groupId>software.amazon.awssdk</groupId>
        <artifactId>dynamodb</artifactId>
    </dependency>

    
    <dependency>
        <groupId>com.amazonaws</groupId>
        <artifactId>DynamoDBLocal</artifactId>
        <version>1.12.0</version>
        <scope>test</scope>
    </dependency>

    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

<repositories>
    <repository>
        <id>dynamodb-local</id>
        <name>DynamoDB Local Release Repository</name>
        <url>https://s3-us-west-2.amazonaws.com/dynamodb-local/release</url>
    </repository>
</repositories>

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-dependency-plugin</artifactId>
            <version>2.10</version>
            <executions>
                <execution>
                    <id>copy</id>
                    <phase>test-compile</phase>
                    <goals>
                        <goal>copy-dependencies</goal>
                    </goals>
                    <configuration>
                        <includeScope>test</includeScope>
                        <includeTypes>so,dll,dylib</includeTypes>
                        <outputDirectory>${project.basedir}/target/native-libs</outputDirectory>
                    </configuration>
                </execution>
            </executions>
        </plugin>
    </plugins>
    <pluginManagement>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-surefire-plugin</artifactId>
                <configuration>
                    <systemPropertyVariables>
                        <sqlite4java.library.path>${project.build.directory}/native-libs</sqlite4java.library.path>
                    </systemPropertyVariables>
                </configuration>
            </plugin>
        </plugins>
    </pluginManagement>
</build>

2. 在創建表之前創建服務器。
   在您開始提交請求之前，您的本地 dynamoDB 服務器必須正在運行。 如果您不這樣做，這可以解釋為什么您會收到connection refused 。 您可以從此處復制創建服務器的規則
   一旦你有了上面的 class 你只需要把這個成員變量添加到你的測試中。

   @ClassRule static final LocalDynamoDBCreationRule server = new LocalDynamoDBCreationRule (); 這可以確保您在開始運行測試之前有一個正在運行的服務器。