Java.lang.ClassNotFoundException:org.codehaus.jackson.JsonProcessingException Exception Solution

Using Jackson in SPRINGMVC to implement JSON output is configured as follows:

<!--output object to JSON support--<BeanId="Stringconverter"class="Org.springframework.http.converter.StringHttpMessageConverter" >  <PropertyName="Supportedmediatypes" >   <List>    <Value>text/plain;charset=utf-8</Value>   </List>  </Property> </Bean> <BeanId="Jsonconverter"  class="Org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" ></Bean>   <Bean  class="Org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" >  <PropertyName="Messageconverters" >   <list>     <ref span class= "attribute" >bean= "Stringconverter"/>     <ref span class= "attribute" >bean= "Jsonconverter"/>   Span class= "indent" > </list>   </property>  </BEAN>            

The Maven coordinate situation is as follows:

<Dependency>    <Groupid>org.apache.geronimo.specs</Groupid>  <Artifactid>geronimo-servlet_2.5_spec</Artifactid>  <version>1.2</Version> </Dependency> <Dependency>  <Groupid>org.springframework</Groupid>  <Artifactid>spring-web</Artifactid>  <Version>3.2.10.release</Version> </Dependency> <Dependency>  <Groupid>org.springframework</Groupid>  <Artifactid>spring-webmvc</Artifactid>  <version>3.2.10.release</version>  </dependency> <dependency> < groupid>com.fasterxml.jackson.jaxrs</groupId > <artifactid>jackson-jaxrs-xml-provider< span class= "tag" ></artifactid> < version>2.4.1</version>  </DEPENDENCY>        

The following exception occurred:

Severity: Servlet/pcrm threwLoad ()Exceptionjava.lang.ClassNotFoundException:org.codehaus.jackson.JsonProcessingException  At Org.apache.catalina.loader.WebappClassLoader.loadClass (Webappclassloader.java:1718) At Org.apache.catalina.loader.WebappClassLoader.loadClass (Webappclassloader.java:1569) 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:231) At Org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.determineConstructorsFromBeanPostProcessors (Abstractautowirecapablebeanfactory.java:1003) At Org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance ( Abstractautowirecapablebeanfactory.java:976) At Org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean ( Abstractautowirecapablebeanfactory.java:487) At Org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean ( Abstractautowirecapablebeanfactory.java:458) At org.springframework.beans.factory.support.abstractbeanfactory$1.getObject (Abstractbeanfactory.java:293) At Org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton ( Defaultsingletonbeanregistry.java:223) At Org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean (Abstractbeanfactory.java:290) At Org.springframework.beans.factory.support.AbstractBeanFactory.getBean (Abstractbeanfactory.java:191) At Org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons ( Defaultlistablebeanfactory.java:633) At Org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization ( Abstractapplicationcontext.java:932) At Org.springframework.context.support.AbstractApplicationContext.refresh (Abstractapplicationcontext.java:479) At Org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext ( Frameworkservlet.java:651) At Org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext (Frameworkservlet.java:602) At Org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext (Frameworkservlet.java:665) At Org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext (Frameworkservlet.java:521) At Org.springframework.web.servlet.FrameworkServlet.initServletBean (Frameworkservlet.java:462) At Org.springframework.web.servlet.HttpServletBean.init (Httpservletbean.java:136) At Javax.servlet.GenericServlet.init (Genericservlet.java:158) At Org.apache.catalina.core.StandardWrapper.initServlet (Standardwrapper.java:1279) At Org.apache.catalina.core.StandardWrapper.loadServlet (Standardwrapper.java:1192) At Org.apache.catalina.core.StandardWrapper.Load (Standardwrapper.java:1087) At Org.apache.catalina.core.StandardContext.loadOnStartup (Standardcontext.java:5210) At Org.apache.catalina.core.StandardContext.startInternal (Standardcontext.java:5493) At Org.apache.catalina.util.LifecycleBase.Start (Lifecyclebase.java:150) at org.apache.catalina.core.containerbase$startchild. call (containerbase.java:1559)  at org.apache.catalina.core.containerbase$startchild. call (containerbase.java:1549)  at java.util.concurrent.FutureTask.run (Futuretask.java:262)  at java.util.concurrent.ThreadPoolExecutor.runWorker ( Threadpoolexecutor.java:1145)  at Java.util.concurrent.threadpoolexecutor$worker.run (Threadpoolexecutor.java:615)  at java.lang.Thread.run (Thread.java:744)   

At first I thought I didn't import Jackson's jar package, but after the troubleshooting, I found that maven coordinates were there, and the jar package was imported into the project, but it was still wrong. So I looked in the imported Jackson bag. Org.codehaus.jackson.JsonProcessingException class, found in the imported Jackson bag, is not Org.codehaus's Jackson bag, but Com.fasterxml's Jackson bag. So make sure the MAVEN coordinates are wrong.

Solution:

<dependency>    <groupid>com.fasterxml.jackson.jaxrs</groupId ><artifactid>jackson-jaxrs-xml-provider</artifactid><version >2.4.1</version></dependency>       

Change into

<dependency>           <groupid>org.codehaus.jackson</<artifactid> JACKSON-MAPPER-ASL</<version>1.9.4</</dependency>  

Java.lang.ClassNotFoundException:org.codehaus.jackson.JsonProcessingException Exception Solution