Question

我已将来自aws-dynamodb-examples的DynamoDB流适配器演示的代码合并到我的Maven项目中，并且我遇到了运行时错误：

Exception in thread "Thread-2" java.lang.NoClassDefFoundError: com/amazonaws/util/json/JSONObject
at com.amazonaws.services.kinesis.leases.impl.Lease.toString(Lease.java:229)

知道为什么会发生这种情况以及我可以采取哪些措施来解决这个问题？

我的pom文件是这样的：

<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.aligntech</groupId>
  <artifactId>dynamodbstream</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>dynamodbstream</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
      <maven.compiler.source>1.8</maven.compiler.source>
      <maven.compiler.target>1.8</maven.compiler.target>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>

      <dependency>
          <groupId>com.amazonaws</groupId>
          <artifactId>aws-java-sdk</artifactId>
          <version>LATEST</version>
      </dependency>

    <dependency>
      <groupId>com.amazonaws</groupId>
      <artifactId>dynamodb-streams-kinesis-adapter</artifactId>
      <version>LATEST</version>
    </dependency>


  </dependencies>
</project>

Answer 1

如果我将aws-java-sdk的版本更改为1.10.77，问题就解决了。似乎1.11.0版本中的kinesis库正在尝试使用已从com.amazonaws.util.json中删除的JSONObject。

Answer 2

尝试此配置。适合我，我认为这是正确的做法。使用此配置，您可以与最新的AWS版本保持一致。

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath "io.spring.gradle:dependency-management-plugin:1.0.0.RC2"
    }
}

apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: "io.spring.dependency-management"

group = 'com.example'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.7

repositories {
    mavenCentral()
    maven {
        url "http://mvnrepository.com/artifact/com.amazonaws/aws-java-sdk"
    }

}

dependencyManagement {
    imports {
        mavenBom 'com.amazonaws:aws-java-sdk-bom:1.11.197'
    }
}

dependencies {

    compile group: 'com.amazonaws', name: 'aws-java-sdk', version: '1.11.197'
    compile group: 'com.amazonaws', name: 'amazon-kinesis-client', version: '1.8.1'

    testCompile group: 'junit', name: 'junit', version: '4.12'
}

为什么我在amazon-kinesis-client中的JSONObject上获得NoClassDefFoundError？

2 个答案: