FAQ（69）：java.lang.IllegalStateException: Cannot convert value of type ‘java.lang.String‘ to required

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1、springmvc的配置文件，配置FastJson的消息转换器--FastJasonHttpMessageConverter

2、log：

java.lang.IllegalStateException: Cannot convert value of type 'java.lang.String' to required type 'com.alibaba.fastjson.serializer.SerializerFeature' for property 'features[0]': no matching editors or conversion strategy found
	org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:306)
	org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:143)
	org.springframework.beans.TypeConverterDelegate.convertToTypedArray(TypeConverterDelegate.java:479)
	org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:216)
	org.springframework.beans.AbstractNestablePropertyAccessor.convertIfNecessary(AbstractNestablePropertyAccessor.java:588)
	org.springframework.beans.AbstractNestablePropertyAccessor.convertForProperty(AbstractNestablePropertyAccessor.java:615)
	org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:216)
	org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.convertForProperty(AbstractAutowireCapableBeanFactory.java:1577)
	org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1536)
	org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1276)
	org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553)
	org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
	org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveInnerBean(BeanDefinitionValueResolver.java:299)
	org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:122)
	org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveManagedList(BeanDefinitionValueResolver.java:382)
	org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:157)
	org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1531)
	org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1276)
	org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553)
	org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
	org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
	org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
	org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
	org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
	org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761)
	org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:867)
	org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543)
	org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:668)
	org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:634)
	org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:682)
	org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:553)
	org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:494)
	org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:171)
	javax.servlet.GenericServlet.init(GenericServlet.java:158)
	org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:504)
	org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
	org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:620)
	org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:502)
	org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1132)
	org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:684)
	org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2527)
	org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2516)
	java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	java.lang.Thread.run(Unknown Source)

解决：

    <mvc:annotation-driven>
    	<mvc:message-converters>
    		<bean class="org.springframework.http.converter.StringHttpMessageConverter"> 
    			<property name="supportedMediaTypes">
	    			<list>
	    				<value>application/json;charset=UTF-8</value>
	    			</list>
    			</property>
    		</bean>
    		<bean class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter">
    			<property name="supportedMediaTypes">
    				<list>
    					<value>text/html;charset=UTF-8</value>
	    				<value>application/json</value>
	    			</list>
    			</property>
    			<property name="features">
    				<list>
    					<!-- 输出Date的日期转换器-->
    					<value>WriteDateUseDateFormat</value>
   					</list>
    			</property>
    		</bean>
    	</mvc:message-converters>
    </mvc:annotation-driven>

上面已经作了以下修改：

原：

    			<property name="features">
    				<list>
    					<!-- 输出Date的日期转换器-->
    					<value>WriteDateUserDateFormat</value>
   					</list>
    			</property>

改为：

   			<property name="features">
    				<list>
    					<!-- 输出Date的日期转换器-->
    					<value>WriteDateUseDateFormat</value>
   					</list>
    			</property>

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