转载：Spring集成JSON报错：java.lang.ClassNotFoundException: org.codehaus.jackson.JsonProcessingException

╰半夏微凉° 2022-05-14 10:48 87阅读 0赞

转载：[https://blog.csdn.net/jiaotuwoaini/article/details/52366057][https_blog.csdn.net_jiaotuwoaini_article_details_52366057]

先看异常信息：

SEVERE: StandardWrapper.Throwable 
       java.lang.NoClassDefFoundError: org/codehaus/jackson/JsonProcessingException 
       at java.lang.Class.getDeclaredConstructors0(Native Method) 
       at java.lang.Class.privateGetDeclaredConstructors(Class.java:2493) 
       at java.lang.Class.getDeclaredConstructors(Class.java:1901) 
       at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.determineCandidateConstructors(AutowiredAnnotationBeanPostProcessor.java:234) 
       at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.determineConstructorsFromBeanPostProcessors(AbstractAutowireCapableBeanFactory.java:1040) 
       at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1013) 
       at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:504) 
       at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475) 
       at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:304) 
       at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228) 
       at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:300) 
       at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:195) 
       at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:700) 
       at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:760) 
       at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482) 
       at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:658) 
       at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:624) 
       at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:672) 
       at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:543) 
       at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:484) 
       at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136) 
       at javax.servlet.GenericServlet.init(GenericServlet.java:158) 
       at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1231) 
       at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1144) 
       at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1031) 
       at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4909) 
       at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5196) 
       at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 
       at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:725) 
       at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:701) 
       at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:717) 
       at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1069) 
       at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1719) 
       at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) 
       at java.util.concurrent.FutureTask.run(FutureTask.java:262) 
       at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) 
       at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) 
       at java.lang.Thread.run(Thread.java:744) 
       Caused by: java.lang.ClassNotFoundException: org.codehaus.jackson.JsonProcessingException 
       at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1305) 
       at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1157) 
       ... 38 more

看我们的pom.xml配置：

<properties> 
        
       <spring.version>4.0.2.RELEASE </spring.version> 
        
       <mybatis.version>3.2.6 </mybatis.version> 
        
       <slf4j.version>1.7.7 </slf4j.version> 
       <log4j.version>1.2.17 </log4j.version> 
       <jackson.version>2.8.1 </jackson.version> 
       </properties> 
       
       <dependencies> 
       <dependency> 
       <groupId>junit </groupId> 
       <artifactId>junit </artifactId> 
       <version>4.11 </version> 
        
       <scope>test </scope> 
       </dependency> 
        
       <dependency> 
       <groupId>org.springframework </groupId> 
       <artifactId>spring-core </artifactId> 
       <version>${spring.version} </version> 
       </dependency> 
       
       <dependency> 
       <groupId>org.springframework </groupId> 
       <artifactId>spring-web </artifactId> 
       <version>${spring.version} </version> 
       </dependency> 
       <dependency> 
       <groupId>org.springframework </groupId> 
       <artifactId>spring-oxm </artifactId> 
       <version>${spring.version} </version> 
       </dependency> 
       <dependency> 
       <groupId>org.springframework </groupId> 
       <artifactId>spring-tx </artifactId> 
       <version>${spring.version} </version> 
       </dependency> 
       
       <dependency> 
       <groupId>org.springframework </groupId> 
       <artifactId>spring-jdbc </artifactId> 
       <version>${spring.version} </version> 
       </dependency> 
       
       <dependency> 
       <groupId>org.springframework </groupId> 
       <artifactId>spring-webmvc </artifactId> 
       <version>${spring.version} </version> 
       </dependency> 
       <dependency> 
       <groupId>org.springframework </groupId> 
       <artifactId>spring-aop </artifactId> 
       <version>${spring.version} </version> 
       </dependency> 
       
       <dependency> 
       <groupId>org.springframework </groupId> 
       <artifactId>spring-context-support </artifactId> 
       <version>${spring.version} </version> 
       </dependency> 
       
       <dependency> 
       <groupId>org.springframework </groupId> 
       <artifactId>spring-test </artifactId> 
       <version>${spring.version} </version> 
       </dependency> 
        
       <dependency> 
       <groupId>org.mybatis </groupId> 
       <artifactId>mybatis </artifactId> 
       <version>${mybatis.version} </version> 
       </dependency> 
        
       <dependency> 
       <groupId>org.mybatis </groupId> 
       <artifactId>mybatis-spring </artifactId> 
       <version>1.2.2 </version> 
       </dependency> 
        
       <dependency> 
       <groupId>javax </groupId> 
       <artifactId>javaee-api </artifactId> 
       <version>7.0 </version> 
       </dependency> 
        
       <dependency> 
       <groupId>mysql </groupId> 
       <artifactId>mysql-connector-java </artifactId> 
       <version>5.1.30 </version> 
       </dependency> 
        
       <dependency> 
       <groupId>commons-dbcp </groupId> 
       <artifactId>commons-dbcp </artifactId> 
       <version>1.2.2 </version> 
       </dependency> 
        
       <dependency> 
       <groupId>jstl </groupId> 
       <artifactId>jstl </artifactId> 
       <version>1.2 </version> 
       </dependency> 
        
        
       <dependency> 
       <groupId>log4j </groupId> 
       <artifactId>log4j </artifactId> 
       <version>${log4j.version} </version> 
       </dependency> 
       
       
        
       <dependency> 
       <groupId>com.alibaba </groupId> 
       <artifactId>fastjson </artifactId> 
       <version>1.1.41 </version> 
       </dependency> 
       
       <dependency> 
       <groupId>org.slf4j </groupId> 
       <artifactId>slf4j-api </artifactId> 
       <version>${slf4j.version} </version> 
       </dependency> 
       
       <dependency> 
       <groupId>org.slf4j </groupId> 
       <artifactId>slf4j-log4j12 </artifactId> 
       <version>${slf4j.version} </version> 
       </dependency> 
        
        
       <span style="color:#ff0000;"> <dependency> 
       <groupId>com.fasterxml.jackson.core </groupId> 
       <artifactId>jackson-databind </artifactId> 
       <version>${jackson.version} </version> 
       </dependency> 
       <dependency> 
       <groupId>com.fasterxml.jackson.core </groupId> 
       <artifactId>jackson-annotations </artifactId> 
       <version>${jackson.version} </version> 
       </dependency> 
       <dependency> 
       <groupId>com.fasterxml.jackson.core </groupId> 
       <artifactId>jackson-core </artifactId> 
       <version>${jackson.version} </version> 
       </dependency> </span> 
        
       <dependency> 
       <groupId>commons-fileupload </groupId> 
       <artifactId>commons-fileupload </artifactId> 
       <version>1.3.1 </version> 
       </dependency> 
       <dependency> 
       <groupId>commons-io </groupId> 
       <artifactId>commons-io </artifactId> 
       <version>2.4 </version> 
       </dependency> 
       <dependency> 
       <groupId>commons-codec </groupId> 
       <artifactId>commons-codec </artifactId> 
       <version>1.9 </version> 
       </dependency> 
       <dependency> 
       <groupId>org.apache.httpcomponents </groupId> 
       <artifactId>httpclient </artifactId> 
       <version>4.5.2 </version> 
       </dependency> 
       
       </dependencies>

可以看到红色的jackson已经被配置进去了，为什么还报错？

经过排查发现Spring的配置是从网上拷贝的，版本比较老，其中关于json的配置是：

<bean id="mappingJacksonHttpMessageConverter" 
       class= "org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"> 
       <property name="supportedMediaTypes"> 
       <list> 
       <value>text/html;charset=UTF-8 </value> 
       </list> 
       </property> 
       </bean>

如果将Spring的版本提高到最新的版本(4.3.2.RELEASE)，这里其实是会报错的。

原来是实现类变化了，现在更改为：

class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"> 
       <property name="supportedMediaTypes"> 
       <list> 
       <value>text/html;charset=UTF-8 </value> 
       </list> 
       </property> 
       </bean>

注意中间的  2 。

[https_blog.csdn.net_jiaotuwoaini_article_details_52366057]: https://blog.csdn.net/jiaotuwoaini/article/details/52366057