Quarkus和DynamoDBMapper-在本机构建中“HASH密钥没有映射”

Question

我有一套基于Quarkus的REST服务，它们利用DynamoDB实现数据持久化。我使用DynamoDBMapper实现了这一点，在JVM模式下运行时，我的代码没有问题。然而，当我试图构建和运行一个本机映像时，我得到了DynamoDB映射错误。

我的实体代码如下所示：

@DynamoDBTable(tableName = "MyTable")
public class MyEntity {

    /**
     *
     */
    private static final long serialVersionUID = -4532872175331494789L;

    @DynamoDBHashKey(attributeName = "pk")
    private String partitionKey = null;

    @DynamoDBRangeKey(attributeName = "sk")
    private String rangeKey = null;

  ...

}

我在启动时创建我的表，就像这样...

        AmazonDynamoDB client = ...
        DynamoDB dynamoDB = new DynamoDB(client);

        String accessKey = "xxx";
        String secretKey = "yyy";

        AWSCredentials creds = new BasicAWSCredentials(accessKey, secretKey);
        AWSCredentialsProvider credProvider = new AWSStaticCredentialsProvider(creds);

        DynamoDBMapper mapper = new DynamoDBMapper(client, credProvider);

        CreateTableRequest req = mapper.generateCreateTableRequest(MyEntity.class);
        client.createTable(req);

同样，在JVM模式下，这段代码可以正常工作。但是，如果我构建一个本机映像并运行它，我会看到以下异常：

11:20:48 ERROR [io.quarkus.application] Failed to start application: com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMappingException: MyEntity; no mapping for HASH key
    at com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapperTableModel.hashKey(DynamoDBMapperTableModel.java:119)
    at com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapperTableModel$Builder.build(DynamoDBMapperTableModel.java:449)
    at com.amazonaws.services.dynamodbv2.datamodeling.StandardModelFactories$StandardTableFactory.getTable(StandardModelFactories.java:107)
    at com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapper.getTableModel(DynamoDBMapper.java:408)
    at com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapper.generateCreateTableRequest(DynamoDBMapper.java:2268)
    at com.amazonaws.services.dynamodbv2.datamodeling.AbstractDynamoDBMapper.generateCreateTableRequest(AbstractDynamoDBMapper.java:339)
    at com.myapp.persistence.DynamoDBTableInitializer.observeStartup(DynamoDBTableInitializer.java:93)
    at com.myapp.persistence.DynamoDBTableInitializer_Observer_observeStartup_988ebae54ee676255a64ec2d4203a1bb713ccc8e.notify(DynamoDBTableInitializer_Observer_observeStartup_988ebae54ee676255a64ec2d4203a1bb713ccc8e.zig:111)
    at io.quarkus.arc.impl.EventImpl$Notifier.notifyObservers(EventImpl.java:282)
    at io.quarkus.arc.impl.EventImpl$Notifier.notify(EventImpl.java:267)
    at io.quarkus.arc.impl.EventImpl.fire(EventImpl.java:69)
    at io.quarkus.arc.runtime.LifecycleEventRunner.fireStartupEvent(LifecycleEventRunner.java:23)
    at io.quarkus.arc.runtime.ArcRecorder.handleLifecycleEvents(ArcRecorder.java:108)
    at io.quarkus.deployment.steps.LifecycleEventsBuildStep$startupEvent78.deploy_0(LifecycleEventsBuildStep$startupEvent78.zig:77)
    at io.quarkus.deployment.steps.LifecycleEventsBuildStep$startupEvent78.deploy(LifecycleEventsBuildStep$startupEvent78.zig:36)
    at io.quarkus.runner.ApplicationImpl.doStart(ApplicationImpl.zig:285)
    at io.quarkus.runtime.Application.start(Application.java:87)
    at io.quarkus.runtime.Application.run(Application.java:210)
    at io.quarkus.runner.GeneratedMain.main(GeneratedMain.zig:41)

我的散列键被清晰地映射到实体类中，所以我不知道为什么会出现这个错误。有人能推荐一些故障排除技巧，或者提供一些关于发生了什么的见解吗？

Answer 1

您需要注册反射类才能在本机模式下工作：

@RegisterForReflection
@DynamoDBTable(tableName = "MyTable")
public class MyEntity {

见：

• QUARKUS-编写本机应用程序的技巧-注册反射

在构建本机可执行文件时，GraalVM以封闭世界的假设进行操作。它分析调用树并删除所有未直接使用的类/方法/字段。

通过反射使用的元素不是调用树的一部分，因此它们被消除了死代码（如果在其他情况下不直接调用）。要在本机可执行文件中包含这些元素，需要显式注册它们以进行反射。