解决java.lang.IllegalArgumentException: No converter found for return value of type: class java.uvvvvv
2018-01-25 18:53
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一、背景
最近闲来无事,想自己搭建一套Spring+SpringMVC+Mybatis+Mysql的环境(搭建步骤会在以后博客中给出),结果运行程序时,适用@ResponseBody注解进行返回List<对象>的json数据时出现了:nested exception is java.lang.IllegalArgumentException: No converter found for return value of type: class java.util.ArrayList错误,就细细分析了下,而后解决了该问题,先拿来备份和分享!
二、框架搭建环境
1.jdk 1.72.maven 3.3.9
3.spring 4.2.6.RELEASE
4.springmvc 4.2.6.RELEASE
5.mybatis 3.2.8
三、错误原因及解决步骤
1.原因:这是因为springmvc默认是没有对象转换成json的转换器的,需要手动添加jackson依赖。2.解决步骤:
手动添加jackson依赖到pom.xml文件中
<properties> <jackson.version>2.5.4</jackson.version> </properties> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-core</artifactId> <version>${jackson.version}</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>${jackson.version}</version> </dependency>
如果还是没有解决,则进行以下步骤
在springmvc配置文件中进行如下配置
<mvc:annotation-driven> <mvc:message-converters> <bean class="org.springframework.http.converter.StringHttpMessageConverter"/> <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"/> </mvc:message-converters> </mvc:annotation-driven>
这样我们就完美解决了该问题。
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