Spring Boot上的Jackson数据绑定依赖错误，AWS应用

Question

我从start.spring.io创建了一个具有Web依赖性的Spring Boot应用程序。然后我加入AWS SDK依赖作为 -

<dependency> 
    <groupId>com.amazonaws</groupId> 
    <artifactId>aws-java-sdk</artifactId> 
    <version>1.11.157</version> 
</dependency> 

在builing的应用程序，我收到以下错误 -

2017-07-02 03:02:11.431 WARN 18412 --- [   main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'requestMappingHandlerAdapter' defined in class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter]: Factory method 'requestMappingHandlerAdapter' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'messageConverters' defined in class path resource [org/springframework/boot/autoconfigure/http/HttpMessageConvertersAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.boot.autoconfigure.http.HttpMessageConverters]: Factory method 'messageConverters' threw exception; nested exception is java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/Module 

其中

nested exception is java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/Module 

在错误日志中多次出现。

我检查了树和依赖关系层次结构等，但是如果我从AWS依赖项中排除Jackson，仍然会发生同样的错误。 如何解决此错误？

这里是pom.xml中 -

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

    <groupId>com.sample1</groupId> 
    <artifactId>Sample13</artifactId> 
    <version>0.0.1-SNAPSHOT</version> 
    <packaging>jar</packaging> 

    <name>Sample13</name> 
    <description>Demo project for Spring Boot</description> 

    <parent> 
     <groupId>org.springframework.boot</groupId> 
     <artifactId>spring-boot-starter-parent</artifactId> 
     <version>2.0.0.M2</version> 
     <relativePath /> <!-- lookup parent from repository --> 
    </parent> 

    <properties> 
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> 
     <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> 
     <java.version>1.8</java.version> 
    </properties> 

    <dependencyManagement> 
     <dependencies> 
      <dependency> 
       <groupId>com.amazonaws</groupId> 
       <artifactId>aws-java-sdk-bom</artifactId> 
       <version>1.11.106</version> 
       <type>pom</type> 
       <scope>import</scope> 
      </dependency> 
     </dependencies> 
    </dependencyManagement> 

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

     <dependency> 
      <groupId>org.postgresql</groupId> 
      <artifactId>postgresql</artifactId> 
      <scope>runtime</scope> 
     </dependency> 
     <dependency> 
      <groupId>org.springframework.boot</groupId> 
      <artifactId>spring-boot-starter-test</artifactId> 
      <scope>test</scope> 
     </dependency> 
     <dependency> 
      <groupId>com.amazonaws</groupId> 
      <artifactId>aws-java-sdk</artifactId> 
      <version>1.11.157</version> 
     </dependency> 
     <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind --> 

    </dependencies> 

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

    <repositories> 
     <repository> 
      <id>spring-snapshots</id> 
      <name>Spring Snapshots</name> 
      <url>https://repo.spring.io/snapshot</url> 
      <snapshots> 
       <enabled>true</enabled> 
      </snapshots> 
     </repository> 
     <repository> 
      <id>spring-milestones</id> 
      <name>Spring Milestones</name> 
      <url>https://repo.spring.io/milestone</url> 
      <snapshots> 
       <enabled>false</enabled> 
      </snapshots> 
     </repository> 
    </repositories> 

    <pluginRepositories> 
     <pluginRepository> 
      <id>spring-snapshots</id> 
      <name>Spring Snapshots</name> 
      <url>https://repo.spring.io/snapshot</url> 
      <snapshots> 
       <enabled>true</enabled> 
      </snapshots> 
     </pluginRepository> 
     <pluginRepository> 
      <id>spring-milestones</id> 
      <name>Spring Milestones</name> 
      <url>https://repo.spring.io/milestone</url> 
      <snapshots> 
       <enabled>false</enabled> 
      </snapshots> 
     </pluginRepository> 
    </pluginRepositories> 

Answer 1

您是从无论是从AWS依赖和Spring引导排除杰克逊也不是你自己定义它作为一个依赖。

为什么排除杰克逊是必需的。

没有从春天启动应用程序启动时不包括杰克逊，

具体的例子 - https://github.com/Flaw101/jackson-databind-error