最近用spring4.x整合Jackson------>java.lang.ClassNotFoundException:

最近用spring4.x整合Jackson，結果莫名其妙的一直報錯，網上收索的結果都是在maven或者gradle的環境下配置依賴條件解決的；但是eclipseIDE環境下的jar包應該是會自動依賴影射的。結果一直也沒找到可以解決的答案。

后來實在是木有辦法了，懷疑到版本的問題了，結果就是版本問題導致的。spring4.x 至少要用Jackson2.6以上才能匹配。

錯誤如下：

 

<span style="font-size:18px;">java.lang.ClassNotFoundException: com.fasterxml.jackson.core.util.DefaultIndenter  
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1308)  
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1142)</span>

<span style="font-size:18px;">Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener  
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter': Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter]: Constructor threw exception; nested exception is java.lang.NoClassDefFoundError: com/fasterxml/jackson/core/util/DefaultIndenter  
    </span>

<span style="font-size:18px;">Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter]: Constructor threw exception; nested exception is java.lang.NoClassDefFoundError: com/fasterxml/jackson/core/util/DefaultIndenter 
</span> 

把Jackson的包換成2.6以上就能解決了。三個核心包，網上都有的。