Fix Java.lang.IllegalArgumentException:No converter found for return value of Type:class java.util.ArrayList issue

In the Spring + SPRINGMVC + mybatis Framework, we configured the interface to return JSON format, but reported the following error:

124-oct-2017 17:42:23.495 Serious [http-nio-8080-exec-6] Org.apache.catalina.core.StandardWrapperValve.invoke Servlet.service () forservlet [Dispatcherservlet] in the context with path [] threw exception [Request processing failed; nested exception is JAVA.L Ang. Illegalargumentexception:no Converter found for returnValue of type:classjava.util.ArrayList] with root cause2Java.lang.IllegalArgumentException:No Converter found for returnValue of type:classjava.util.ArrayList3At Org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters (abstractmessageconvertermethodprocessor.java:187)4At Org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.handleReturnValue ( requestresponsebodymethodprocessor.java:174)5At Org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue ( handlermethodreturnvaluehandlercomposite.java:81)6At Org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle ( servletinvocablehandlermethod.java:113)7At Org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod ( requestmappinghandleradapter.java:827)8At Org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal ( requestmappinghandleradapter.java:738)9At Org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle ( Abstracthandlermethodadapter.java:85)TenAt Org.springframework.web.servlet.DispatcherServlet.doDispatch (dispatcherservlet.java:967) OneAt Org.springframework.web.servlet.DispatcherServlet.doService (dispatcherservlet.java:901) AAt Org.springframework.web.servlet.FrameworkServlet.processRequest (frameworkservlet.java:970) -At Org.springframework.web.servlet.FrameworkServlet.doGet (frameworkservlet.java:861) -At Javax.servlet.http.HttpServlet.service (httpservlet.java:622) theAt Org.springframework.web.servlet.FrameworkServlet.service (frameworkservlet.java:846) -At Javax.servlet.http.HttpServlet.service (httpservlet.java:729) -At Org.apache.catalina.core.ApplicationFilterChain.internalDoFilter (applicationfilterchain.java:230) -At Org.apache.catalina.core.ApplicationFilterChain.doFilter (applicationfilterchain.java:165) +At Org.apache.tomcat.websocket.server.WsFilter.doFilter (wsfilter.java:52) -At Org.apache.catalina.core.ApplicationFilterChain.internalDoFilter (applicationfilterchain.java:192) +At Org.apache.catalina.core.ApplicationFilterChain.doFilter (applicationfilterchain.java:165) AAt Org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal (characterencodingfilter.java:197) atAt Org.springframework.web.filter.OncePerRequestFilter.doFilter (onceperrequestfilter.java:107) -At Org.apache.catalina.core.ApplicationFilterChain.internalDoFilter (applicationfilterchain.java:192) -At Org.apache.catalina.core.ApplicationFilterChain.doFilter (applicationfilterchain.java:165) -At Org.apache.catalina.core.StandardWrapperValve.invoke (standardwrappervalve.java:198) -At Org.apache.catalina.core.StandardContextValve.invoke (standardcontextvalve.java:108) -At Org.apache.catalina.authenticator.AuthenticatorBase.invoke (authenticatorbase.java:472) inAt Org.apache.catalina.core.StandardHostValve.invoke (standardhostvalve.java:140) -At Org.apache.catalina.valves.ErrorReportValve.invoke (errorreportvalve.java:79) toAt Org.apache.catalina.valves.AbstractAccessLogValve.invoke (abstractaccesslogvalve.java:620) +At Org.apache.catalina.core.StandardEngineValve.invoke (standardenginevalve.java:87) -At Org.apache.catalina.connector.CoyoteAdapter.service (coyoteadapter.java:349) theAt Org.apache.coyote.http11.Http11Processor.service (http11processor.java:784) *At Org.apache.coyote.AbstractProcessorLight.process (abstractprocessorlight.java:66) $At Org.apache.coyote.abstractprotocol$connectionhandler.process (abstractprotocol.java:802)Panax NotoginsengAt Org.apache.tomcat.util.net.nioendpoint$socketprocessor.dorun (nioendpoint.java:1410) -At Org.apache.tomcat.util.net.SocketProcessorBase.run (socketprocessorbase.java:49) theAt Java.util.concurrent.ThreadPoolExecutor.runWorker (threadpoolexecutor.java:1142) +At Java.util.concurrent.threadpoolexecutor$worker.run (threadpoolexecutor.java:617) AAt Org.apache.tomcat.util.threads.taskthread$wrappingrunnable.run (taskthread.java:61) theAt Java.lang.Thread.run (thread.java:745)

After the degree Niang, because SPRINGMVC default is no object to convert to JSON converter, need to manually add the Jackson dependency.

Therefore, in the Build.gradle, add:

1     Compile group: ' Com.fasterxml.jackson.core ', Name: ' Jackson-core ', version: ' 2.8.8 '2     //  Https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind3     Compile Group : ' Com.fasterxml.jackson.core ', Name: ' Jackson-databind ', version: ' 2.8.8 '4//https:// Mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-annotations5     compile group: ' Com.fasterxml.jackson.core ', Name: ' Jackson-annotations ', version: ' 2.8.8 '

If maven, join:

Manually add Jackson to the Pom.xml file

  <properties>    <jackson.version>2.5.4</jackson.version>  
  <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>

If it is still not resolved, follow these steps

In the SPRINGMVC configuration file, configure the following

<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>

Thank you for the address: http://www.cnblogs.com/hafiz/p/5812873.html blogger.

Fix Java.lang.IllegalArgumentException:No converter found for return value of Type:class java.util.ArrayList issue