Question

我正在使用DynamoDB构建Spring Boot应用程序。我想添加Spring Data REST。数据层有效，但REST在实体映射时失败。它正确地解析并创建了REST端点但我得到 PersistentEntity不能为null！消息并且在访问REST API时出现异常：

java.lang.IllegalArgumentException: PersistentEntity must not be null!
    at org.springframework.util.Assert.notNull(Assert.java:115)
    at org.springframework.data.rest.webmvc.PersistentEntityResource$Builder.<init>(PersistentEntityResource.java:140)
    at org.springframework.data.rest.webmvc.PersistentEntityResource$Builder.<init>(PersistentEntityResource.java:123)
    at org.springframework.data.rest.webmvc.PersistentEntityResource.build(PersistentEntityResource.java:115)
    at org.springframework.data.rest.webmvc.PersistentEntityResourceAssembler.wrap(PersistentEntityResourceAssembler.java:74)
    at org.springframework.data.rest.webmvc.PersistentEntityResourceAssembler.toResource(PersistentEntityResourceAssembler.java:55)
    at org.springframework.data.rest.webmvc.AbstractRepositoryRestController.entitiesToResources(AbstractRepositoryRestController.java:133)
    at org.springframework.data.rest.webmvc.AbstractRepositoryRestController.toResources(AbstractRepositoryRestController.java:80)
    at org.springframework.data.rest.webmvc.RepositoryEntityController.getCollectionResource(RepositoryEntityController.java:212)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)

removed irrelevant parts of the exception

当我调试代码时，我发现entities中的PersistentEntityResourceAssembler为空。这意味着我的实体没有注册。我想这是因为它们不是常规的JPA实体，只是通过存储库链接到数据层。

如何让Spring了解我的实体以使Data REST框架与DynamoDB协同工作？

以下是我项目的相关部分。虚拟实体表示发电机中的表：

@DynamoDBTable(tableName = "DummyTable")
public class Tester {
    @Id
    private String id;


    @DynamoDBHashKey(attributeName = "id")
    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }
}

存储库：

public interface TesterRepository extends CrudRepository<Tester, String> {

    @EnableScan
    @Override
    Iterable<Tester> findAll();
}

配置类：

@Configuration
@EnableDynamoDBRepositories(basePackages = "com.czequered.promocodes.repository")
public class DynamoDBConfig {

// deleted params

    @Bean
    public AmazonDynamoDB amazonDynamoDB() {
// deleted the simple initializer, just long code
        return amazonDB;
    }

}

gradle依赖项：

compile 'com.amazonaws:aws-java-sdk-core:1.11.86'
compile 'org.springframework.boot:spring-boot-starter'
compile 'org.springframework.boot:spring-boot-starter-data-rest'
compile 'com.github.derjust:spring-data-dynamodb:4.4.1'

代码已经过简化，其余的可以在gist with all files needed to build the whole application中找到。

I tried to follow the demo from the original author of the Spring Data DynamoDB library，但它将JPA和Hibernate添加到我想避免的类路径中，因为我不需要它。

Answer 1

我还开发了带有spring boot和dynamo db的应用程序，但我从未遇到过这个问题。在开发应用程序时我参考下面的示例

Git Dynamo db Spring Boot Spring Data Example

DynamoDB Spring Boot数据休息＆＃34; PersistentEntity不能为空！＆＃34;

1 个答案: