我在pom.xml中添加了以下代码段
namespace rd
{
class Program
{
static void Main(string[] args)
{
login _login = new login();
_login.header_message();
Console.WriteLine(_login.setobj.heading);
Console.ReadKey();
}
}
public class setget
{
public string heading
{ set; get; }
}
public class login
{
public setget setobj = new setget();
public void header_message()
{
setobj.heading= "*************************************************************************************"+
"\n*************************************************************************************"+
"\n************************* *******************************"+
"\n************************* Welcome to Radeon Limited.. *******************************"+
"\n************************* *******************************"+
"\n*************************************************************************************"+
"\n*************************************************************************************";
}
}
}
并得到以下异常：
嵌套异常是java.lang.NoClassDefFoundError： 组织/ springframework的/ HTTP /变换器/ JSON / MappingJacksonHttpMessageConverter
删除上面的标签后，这个弹簧应用程序运行正常。我想知道为什么？
的pom.xml
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.3.2.RELEASE</version>
</parent>
<?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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.sas</groupId>
<artifactId>sts</artifactId>
<name>ApartmentMgmt</name>
<packaging>war</packaging>
<version>1.0.0-BUILD-SNAPSHOT</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.3.2.RELEASE</version>
</parent>
<properties>
<java-version>1.6</java-version>
<jackson.version>2.6.3</jackson.version>
<org.springframework-version>3.1.0.RELEASE</org.springframework-version>
<org.aspectj-version>1.6.9</org.aspectj-version>
<org.slf4j-version>1.5.10</org.slf4j-version>
</properties>
<dependencies>
<!-- Spring -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>3.2.5.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${org.springframework-version}</version><!--$NO-MVN-MAN-VER$-->
<exclusions>
<!-- Exclude Commons Logging in favor of SLF4j -->
<exclusion>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${org.springframework-version}</version><!--$NO-MVN-MAN-VER$-->
</dependency>
<!-- AspectJ -->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjrt</artifactId>
<version>${org.aspectj-version}</version><!--$NO-MVN-MAN-VER$-->
</dependency>
<!-- Logging -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${org.slf4j-version}</version><!--$NO-MVN-MAN-VER$-->
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>jcl-over-slf4j</artifactId>
<version>${org.slf4j-version}</version><!--$NO-MVN-MAN-VER$-->
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>${org.slf4j-version}</version><!--$NO-MVN-MAN-VER$-->
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.15</version><!--$NO-MVN-MAN-VER$-->
<exclusions>
<exclusion>
<groupId>javax.mail</groupId>
<artifactId>mail</artifactId>
</exclusion>
<exclusion>
<groupId>javax.jms</groupId>
<artifactId>jms</artifactId>
</exclusion>
<exclusion>
<groupId>com.sun.jdmk</groupId>
<artifactId>jmxtools</artifactId>
</exclusion>
<exclusion>
<groupId>com.sun.jmx</groupId>
<artifactId>jmxri</artifactId>
</exclusion>
</exclusions>
<scope>runtime</scope>
</dependency>`
答案 0 :(得分：1)
原因是spring-boot-starter-parent不包含对springframework.web库的依赖。
将此添加到您的pom.xml，以解决您的问题
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>3.2.5.RELEASE</version>
</dependency>
答案 1 :(得分：1)
您需要在pom.xml添加jackson依赖项。
请参阅以下链接以包含相关的jackson模块
https://github.com/spring-projects/spring-boot/blob/master/spring-boot-dependencies/pom.xml
或者您可以使用弹簧网络模块，以防万一。它将自动带来所有依赖项：
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${org.springframework.version}</version>
</dependency>