Question

我正在尝试根据 tutorial 使用 DynamoDB 数据库创建Spring Boot应用程序。添加项目依赖项后，看来maven找不到 com.amazonaws 依赖项，这导致了亚马逊变量（例如@EnableDynamoDBRepositories）中的许多错误。

这是实际的代码：

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-parent</artifactId>
       <version>2.2.6.RELEASE</version>
       <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>crudynamo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>crudynamo</name>
    <description>Demo project for Spring Boot</description>

    <properties>
       <java.version>1.8</java.version>
    </properties>

    <dependencyManagement>
       <dependencies>
          <dependency>
             <groupId>org.springframework.data</groupId>
             <artifactId>spring-data-releasetrain</artifactId>
             <version>Lovelace-SR16</version>
             <type>pom</type>
             <scope>import</scope>
          </dependency>
          <dependency>
             <groupId>com.github.derjust</groupId>
             <artifactId>spring-data-dynamodb</artifactId>
             <version>5.1.0</version>
          </dependency>
          <dependency>
             <groupId>com.amazonaws</groupId>
             <artifactId>aws-java-sdk-bom</artifactId>
             <version>1.11.166</version>
             <type>pom</type>
             <scope>import</scope>
          </dependency>
       </dependencies>
    </dependencyManagement>

    <dependencies>
       <dependency>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter</artifactId>
       </dependency>

       <dependency>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-test</artifactId>
          <scope>test</scope>
          <exclusions>
             <exclusion>
                <groupId>org.junit.vintage</groupId>
                <artifactId>junit-vintage-engine</artifactId>
             </exclusion>
          </exclusions>
       </dependency>
    </dependencies>

    <build>
       <plugins>
          <plugin>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-maven-plugin</artifactId>
          </plugin>
       </plugins>
    </build>

 </project>

aplication.properties

amazon.dynamodb.endpoint=http://localhost:8000/
amazon.aws.accesskey=key
amazon.aws.secretkey=key2

DynamoDBConfig.java

package com.example.crudynamo;

 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.util.StringUtils;

 @Configuration
 @EnableDynamoDBRepositories //error
         (basePackages = "com.baeldung.spring.data.dynamodb.repositories")
 public class DynamoDBConfig {

     @Value("${amazon.dynamodb.endpoint}")
     private String amazonDynamoDBEndpoint;

     @Value("${amazon.aws.accesskey}")
     private String amazonAWSAccessKey;

     @Value("${amazon.aws.secretkey}")
     private String amazonAWSSecretKey;

     //error in AmazonDynamoDB

     @Bean
     public AmazonDynamoDB amazonDynamoDB() {
         AmazonDynamoDB amazonDynamoDB
                 = new AmazonDynamoDBClient(amazonAWSCredentials());

         if (!StringUtils.isEmpty(amazonDynamoDBEndpoint)) {
             amazonDynamoDB.setEndpoint(amazonDynamoDBEndpoint);
         }

         return amazonDynamoDB;
     }

     @Bean
     public AWSCredentials amazonAWSCredentials() {
         return new BasicAWSCredentials(
                 amazonAWSAccessKey, amazonAWSSecretKey);
     }
 }

我已经搜索了类似的其他问题，但没有一个解决这个问题。

Answer 1

您必须包括依赖项

   <dependency>
      <groupId>com.github.derjust</groupId>
      <artifactId>spring-data-dynamodb</artifactId>
   </dependency>

进入pom的依赖关系，现在仅在dependencyManagement中拥有它，但这还不够。然后在您的DynamoDBConfig.java文件中包含以下导入：

import com.amazonaws.auth.AWSCredentials; 
import com.amazonaws.auth.BasicAWSCredentials; 
import com.amazonaws.services.dynamodbv2.AmazonDynamoDB; 
import com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient; 
import org.socialsignin.spring.data.dynamodb.repository.config.EnableDynamoDBRepositories;

Answer 2

将您的 pom.xml 文件更改为此：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.6.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>crudynamo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>crudynamo</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.data</groupId>
                <artifactId>spring-data-releasetrain</artifactId>
                <version>Lovelace-SR16</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <dependencies>

        <!-- new dependency -->
        <dependency>
            <groupId>com.github.derjust</groupId>
            <artifactId>spring-data-dynamodb</artifactId>
            <version>5.1.0</version>
        </dependency>

        <!-- this dependency is now inside 'dependencies' tag -->
        <dependency>
            <groupId>com.amazonaws</groupId>
            <artifactId>aws-java-sdk</artifactId>
            <version>1.11.774</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

您忘记添加com.github.derjust依赖性。同样由于某种原因，当com.amazonaws位于dependencyManagement标记内时，也会出现此错误。将他移到dependencies标签即可完成工作。

此后，您将可以使用快捷方式 Alt + Enter 在每个 DynamoDBConfig.java 文件中导入亚马逊变量。变量。

找不到依赖项“ com.amazonaws”

2 个答案: