（类型=内部服务器错误，状态=500）。未找到类型返回值的转换器：com.test.SearchVO 类

Posted 2023-02-26

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【中文标题】（类型=内部服务器错误，状态=500）。未找到类型返回值的转换器：com.test.SearchVO 类【英文标题】：(type=Internal Server Error, status=500). No converter found for return value of type: class com.test.SearchVO 【发布时间】：2016-08-14 15:44:40 【问题描述】：

我有下面的源代码，我试图在 Spring Boot 中运行它，但绑定没有发生，它抱怨它找不到转换器。

出现意外错误：

(type=Internal Server Error, status=500). No converter found for return value of type: class com.test.SearchVO。

据我所知，弹簧靴不需要杰克逊罐在路径中。但是我尝试添加它仍然无法正常工作。我在不同的论坛尝试过类似的问题，找不到任何好的答案，请帮助。

了解springboot会照顾自动转换吗？

我尝试发布我无法接收值等的值。

我从事过 spring 应用程序并第一次尝试 spring boot，因为没有 spring 调度程序。

 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestMethod;
 import org.springframework.web.bind.annotation.RestController;

@RestController
@EnableAutoConfiguration
public class SpringAnnotationTest 

    @RequestMapping(value = "/searchUser", method = RequestMethod.POST)
    public SearchVO searchUser(@RequestBody SearchVO user) 
        System.out.println(user.toString());
        return user;
    

    @RequestMapping(value = "/getSearchUser", method = RequestMethod.GET)
    public SearchVO getSearchUser() 
        SearchVO user = new SearchVO();
        System.out.println(user.toString());
        return user;
    

    public static void main(String[] args) throws Exception 
        SpringApplication.run(SpringAnnotationTest.class, args);

我的 pom

 <?xml version="1.0" encoding="UTF-8"?>
 <project xmlns="http://maven.apache.org/POM/4.0.0"  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.test</groupId>
    <artifactId>test</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>

    <name>test</name>
    <description>test</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.3.3.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-rest</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>
        <!-- <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-security</artifactId> 
            </dependency> -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <!-- <scope>test</scope> -->
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>2.4.3</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.4.3</version>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

这是 VO 课程。

public class SearchVO implements Serializable

/**
 * 
 */
private static final long serialVersionUID = 1L;
private String empid;
private String nickname;
private String email;
private String phone; 

@Override
public String toString() 
    // TODO Auto-generated method stub
    return "<EMPID>"+this.empid+"<NICKNAME>"+nickname+"<email>"+email+"<phone>"+phone;

堆栈跟踪

java.lang.IllegalArgumentException: No converter found for return value of type:
 class com.test.SearchVO
        at org.springframework.web.servlet.mvc.method.annotation.AbstractMessage
ConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMeth
odProcessor.java:178) ~[spring-webmvc-4.2.5.RELEASE.jar:4.2.5.RELEASE]
        at org.springframework.web.servlet.mvc.method.annotation.AbstractMessage
ConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMeth
odProcessor.java:153) ~[spring-webmvc-4.2.5.RELEASE.jar:4.2.5.RELEASE]
        at org.springframework.web.servlet.mvc.method.annotation.RequestResponse
BodyMethodProcessor.handleReturnValue(RequestResponseBodyMethodProcessor.java:16
5) ~[spring-webmvc-4.2.5.RELEASE.jar:4.2.5.RELEASE]
        at org.springframework.web.method.support.HandlerMethodReturnValueHandle
rComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:80) ~
[spring-web-4.2.5.RELEASE.jar:4.2.5.RELEASE]
        at org.springframework.web.servlet.mvc.method.annotation.ServletInvocabl
eHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:126) ~[spring-
webmvc-4.2.5.RELEASE.jar:4.2.5.RELEASE]
        at org.springframework.web.servlet.mvc.method.annotation.RequestMappingH
andlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:817) ~[sprin
g-webmvc-4.2.5.RELEASE.jar:4.2.5.RELEASE]
        at org.springframework.web.servlet.mvc.method.annotation.RequestMappingH
andlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:731) ~[spring-web
mvc-4.2.5.RELEASE.jar:4.2.5.RELEASE]
        at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapt
er.handle(AbstractHandlerMethodAdapter.java:85) ~[spring-webmvc-4.2.5.RELEASE.ja
r:4.2.5.RELEASE]
        at org.springframework.web.servlet.DispatcherServlet.doDispatch(Dispatch
erServlet.java:959) ~[spring-webmvc-4.2.5.RELEASE.jar:4.2.5.RELEASE]
        at org.springframework.web.servlet.DispatcherServlet.doService(Dispatche
rServlet.java:893) ~[spring-webmvc-4.2.5.RELEASE.jar:4.2.5.RELEASE]
        at org.springframework.web.servlet.FrameworkServlet.processRequest(Frame
workServlet.java:968) ~[spring-webmvc-4.2.5.RELEASE.jar:4.2.5.RELEASE]
        at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServl
et.java:859) ~[spring-webmvc-4.2.5.RELEASE.jar:4.2.5.RELEASE]
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:622) ~[tomcat
-embed-core-8.0.32.jar:8.0.32]
        at org.springframework.web.servlet.FrameworkServlet.service(FrameworkSer
vlet.java:844) ~[spring-webmvc-4.2.5.RELEASE.jar:4.2.5.RELEASE]
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) ~[tomcat
-embed-core-8.0.32.jar:8.0.32]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:292) ~[tomcat-embed-core-8.0.32.jar:8.0.32]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:207) ~[tomcat-embed-core-8.0.32.jar:8.0.32]
        at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52
) ~[tomcat-embed-websocket-8.0.32.jar:8.0.32]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:240) ~[tomcat-embed-core-8.0.32.jar:8.0.32]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:207) ~[tomcat-embed-core-8.0.32.jar:8.0.32]
        at org.springframework.boot.actuate.autoconfigure.EndpointWebMvcAutoConf
iguration$ApplicationContextHeaderFilter.doFilterInternal(EndpointWebMvcAutoConf
iguration.java:237) ~[spring-boot-actuator-1.3.3.RELEASE.jar:1.3.3.RELEASE]
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerR
equestFilter.java:107) ~[spring-web-4.2.5.RELEASE.jar:4.2.5.RELEASE]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:240) ~[tomcat-embed-core-8.0.32.jar:8.0.32]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:207) ~[tomcat-embed-core-8.0.32.jar:8.0.32]
        at org.springframework.boot.actuate.trace.WebRequestTraceFilter.doFilter
Internal(WebRequestTraceFilter.java:112) ~[spring-boot-actuator-1.3.3.RELEASE.ja
r:1.3.3.RELEASE]
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerR
equestFilter.java:107) ~[spring-web-4.2.5.RELEASE.jar:4.2.5.RELEASE]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:240) ~[tomcat-embed-core-8.0.32.jar:8.0.32]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:207) ~[tomcat-embed-core-8.0.32.jar:8.0.32]
        at org.springframework.web.filter.RequestContextFilter.doFilterInternal(
RequestContextFilter.java:99) ~[spring-web-4.2.5.RELEASE.jar:4.2.5.RELEASE]
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerR
equestFilter.java:107) ~[spring-web-4.2.5.RELEASE.jar:4.2.5.RELEASE]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:240) ~[tomcat-embed-core-8.0.32.jar:8.0.32]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:207) ~[tomcat-embed-core-8.0.32.jar:8.0.32]
        at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInter
nal(HttpPutFormContentFilter.java:87) ~[spring-web-4.2.5.RELEASE.jar:4.2.5.RELEA
SE]
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerR
equestFilter.java:107) ~[spring-web-4.2.5.RELEASE.jar:4.2.5.RELEASE]

输入 Json “empid”：“哈利”， “昵称”：“哈利”， “电子邮件”：“harry@gmail.com”， “电话”：“12323232”

【问题讨论】：

你能发布 SearchVO 并完成堆栈跟踪吗？我已经添加了堆栈跟踪和 vo 类。我认为您需要为 SearchVO 类设置 getter 和 setter。在内部调用 getter 和 setter 来映射值。试试看它是否有效。 SearchVO 有无参数构造函数吗？为字段添加setter和getter 【参考方案1】：

请确保您拥有 SearchVO 类字段的公共 getter 方法。

【讨论】：

这没有提供问题的答案。一旦你有足够的reputation，你就可以comment on any post；相反，provide answers that don't require clarification from the asker.【参考方案2】：

将@EnableAutoConfiguration 替换为@SpringBootApplication 注释。

@SpringBootApplication 包括：

@Components

@RestController, @Controller, @Repository, @Service

这里是 Small Demo 与您的请求映射。

考虑将 @RestController 移动到 abc.xyz.controller 包下的单独类中，其中 abc.xyz 是包含 SpringBootApplication 类的包，这将确保 @ComponentScan 查找所有原型。

【讨论】：

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