Java Spring 4 和 Rest WS 集成
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Spring 4 and Rest WS integration
提问by suvojit
I have been doing a poc on Spring4 and RestWS integration. I am new to both with barely a weeks exposure. I am following instructions from blogs. I understand that in Spring 4 and restWS setup Hymanson-core/anotation/databind 2 is to be used for correct message converstion of JSON <-> Java object to happen. Also org.springframework.http.converter.json.MappingHymanson2HttpMessageConverteris to be used for message conversion.
I satisfied all these requirements. However when I try to start application, I get bean create exception.
stack
我一直在做关于 Spring4 和 RestWS 集成的 poc。我对这两者都是新手，接触时间不到几周。我正在遵循博客的说明。我知道在 Spring 4 和 restWS 设置中 Hymanson-core/antation/databind 2 将用于正确的 JSON <-> Java 对象的消息转换。也org.springframework.http.converter.json.MappingHymanson2HttpMessageConverter将用于消息转换。我满足了所有这些要求。但是，当我尝试启动应用程序时，出现 bean create 异常。堆
SEVERE: 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 'regionController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private org.springframework.web.servlet.View com.leggmason.lmpamfs.controllers.RegionController.jsonView_i; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.web.servlet.view.json.MappingHymansonJsonView#0' defined in ServletContext resource [/WEB-INF/applicationContext.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [org.springframework.web.servlet.view.json.MappingHymansonJsonView]: Constructor threw exception; nested exception is java.lang.NoClassDefFoundError: org/codehaus/Hymanson/map/ObjectMapper
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:292)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1185)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
at org.springframework.beans.factory.support.AbstractBeanFactory.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:703)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:760)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482)
at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:403)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4961)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5455)
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(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private org.springframework.web.servlet.View com.leggmason.lmpamfs.controllers.RegionController.jsonView_i; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.web.servlet.view.json.MappingHymansonJsonView#0' defined in ServletContext resource [/WEB-INF/applicationContext.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [org.springframework.web.servlet.view.json.MappingHymansonJsonView]: Constructor threw exception; nested exception is java.lang.NoClassDefFoundError: org/codehaus/Hymanson/map/ObjectMapper
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:508)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:289)
... 22 more
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.web.servlet.view.json.MappingHymansonJsonView#0' defined in ServletContext resource [/WEB-INF/applicationContext.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [org.springframework.web.servlet.view.json.MappingHymansonJsonView]: Constructor threw exception; nested exception is java.lang.NoClassDefFoundError: org/codehaus/Hymanson/map/ObjectMapper
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1076)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1021)
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.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.findAutowireCandidates(DefaultListableBeanFactory.java:1017)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:960)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:858)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:480)
... 24 more
Caused by: org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [org.springframework.web.servlet.view.json.MappingHymansonJsonView]: Constructor threw exception; nested exception is java.lang.NoClassDefFoundError: org/codehaus/Hymanson/map/ObjectMapper
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:164)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:89)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1069)
... 35 more
Caused by: java.lang.NoClassDefFoundError: org/codehaus/Hymanson/map/ObjectMapper
at org.springframework.web.servlet.view.json.MappingHymansonJsonView.(MappingHymansonJsonView.java:65)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:148)
... 37 more
Caused by: java.lang.ClassNotFoundException: org.codehaus.Hymanson.map.ObjectMapper
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1702)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1547)
... 43 more
It seems that something is wrong with MappingHymansonJsonViewclass. Could following from factory file be the cause of trouble ?
MappingHymansonJsonView类似乎有问题。来自工厂文件的以下可能是问题的原因吗？
<bean class="org.springframework.web.servlet.view.json.MappingHymansonJsonView">
<property name="contentType" value="text/plain"/>
</bean>
Am I supposed to replace this class as well? I will help assistance to fix this.
我也应该替换这个类吗？我会帮助解决这个问题。
Thanks, Suvojit
谢谢，苏沃吉特
采纳答案by M. Deinum
You are currently using the MappingHymansonJsonViewwhich is designed to work with Hymanson1 .
您目前正在使用MappingHymansonJsonView旨在与Hymanson1 一起使用的。
You mention the following:
你提到了以下几点：
I am not using Hymanson 1 api's. jars in my lib are, Hymanson-core-2.0.2, Hymanson-annotation-2.3.0, Hymanson-bindings 2.3.0.
我没有使用 Hymanson 1 api。我的库中的罐子是 Hymanson-core-2.0.2、Hymanson-annotation-2.3.0、Hymanson-bindings 2.3.0。
Which means you have Hymanson2on your classpath. Hymanson1 and Hymanson2 aren't compatible (different packages, different classes etc.).
这意味着您的类路径上有Hymanson2。Hymanson1 和 Hymanson2 不兼容（不同的包、不同的类等）。
You have 2 possible solutions
您有 2 种可能的解决方案
回答by Haim Raman
For Spring4 Rest + Json POC The following App Context is enough
对于 Spring4 Rest + Json POC，下面的 App Context 就够了
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<context:component-scan base-package="org.name.controller" />
<!-- Enables the Spring MVC @Controller programming model -->
<mvc:annotation-driven />
<mvc:resources location="/statics/" mapping="/statics/**"/>
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/views/" />
<property name="suffix" value=".jsp" />
</bean>
</beans>
Make sure you have dependency for Hymanson (e.g. in maven)
确保您对 Hymanson 有依赖性（例如在 maven 中）
<!-- Hymanson so spring mvc will handle json responses out of the box -->
<dependency>
<groupId>com.fasterxml.Hymanson.core</groupId>
<artifactId>Hymanson-core</artifactId>
<version>2.3.0</version>
</dependency>
<dependency>
<groupId>com.fasterxml.Hymanson.core</groupId>
<artifactId>Hymanson-databind</artifactId>
<version>2.3.0</version>
</dependency>
You do not specifically need to define MappingHymanson2JsonView; MappingHymanson2HttpMessageConverter/MappingHymansonHttpMessageConverter will be created automatically when Hymanson is the the class path (the default is only when ContentType/Accept are application/json).
您不需要特别定义 MappingHymanson2JsonView；MappingHymanson2HttpMessageConverter/MappingHymansonHttpMessageConverter 会在Hymanson为类路径时自动创建（默认仅当ContentType/Accept为application/json时）。
Hymanson1 is deprecated, but still supported if from any reason you are limited to Hymanson1 See Spring 4 docs
Hymanson1 已弃用，但如果出于任何原因您仅限于 Hymanson1 仍受支持 请参阅 Spring 4 文档
