在本文中，我们将详细介绍Idea中：Noconverterfoundforreturnvalueoftype:classjava.util.ArrayList：Json格式转换问题的各个方面，同时，我
在本文中，我们将详细介绍Idea 中：No converter found for return value of type: class java.util.ArrayList：Json 格式转换问题的各个方面，同时，我们也将为您带来关于$.ajax 函数调接口，报异常 No converter found for return value of type: class java.util.ArrayList、(HttpMessageNotWritableException ) No converter found for return value of type xxxx、android – java.lang.NoClassDefFoundError：失败的解析：Lio / realm / internal / SharedRealm $Durability、Cannot convert value of type [java.lang.String] to required type [java.util.Date] for property &#...的有用知识。
本文目录一览：- Idea 中：No converter found for return value of type: class java.util.ArrayList：Json 格式转换问题
- $.ajax 函数调接口，报异常 No converter found for return value of type: class java.util.ArrayList
- (HttpMessageNotWritableException ) No converter found for return value of type xxxx
- android – java.lang.NoClassDefFoundError：失败的解析：Lio / realm / internal / SharedRealm $Durability
- Cannot convert value of type [java.lang.String] to required type [java.util.Date] for property &#...
Idea 中：No converter found for return value of type: class java.util.ArrayList：Json 格式转换问题
1. 在搞 SSM 框架的时候，前端发送请求后，显示如下错误。
@ResponseBody 注解进行返回 List <对象> 的 json 数据时出现
nested exception is java.lang.IllegalArgumentException: No converter found for return value of type: class java.util.ArrayList 错误，
2. 前后调用场景：
2.1mvc 配置文件设置：fastJson，没问题
2.2 Controller 层的注解没问题
2.3 注解路径扫描检查，确认没问题。
2.4pom 中的依赖是父工程管理的，貌似没问题（最后证明问题出在了依赖上）
3. 网上查了这个问题，大部分解释都是：数据以 list 集合返回后，由 AJax 解析是错误，即数据没有转化成 Json 格式。
也可能会以文件的格式下载，而不能正常解析到在浏览器中。
检查了依赖，发现果然是父工程中依赖版本没有添加。为了保险，把依赖版本直接放入子工程中，结果就正常解析了。
<!--json相关的依赖-->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.7.4</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.7.4</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.7.4</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.28</version>
</dependency>
解析正常：
可参考一下文档：https://www.cnblogs.com/hafiz/p/5812873.html
4. 总结：依赖问题是开发过程中常遇到的，比较坑的问题。很容易把注意力放在代码逻辑上。
所以好的编码习惯，规范和统一的依赖管理很重要。
$.ajax 函数调接口，报异常 No converter found for return value of type: class java.util.ArrayList
接口正常执行，返回给前端后报服务器 500 异常，异常详情：
org.springframework.http.converter.HttpMessageNotWritableException: No converter found for return value of type: class java.util.ArrayList
原因没有深究，大概是 $.ajax 函数在前端接收的数据类型为 JSON，而服务中没有能将 ArrayList 转换成 JSON 的类。
暂时记下解决方案 —— 在项目中添加 JSON 全家桶的依赖如下：
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.9.9</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.9.9</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.9.9</version>
</dependency>
(HttpMessageNotWritableException ) No converter found for return value of type xxxx
最近在家没事儿，写写代码玩，用了 Maven 构建 SSM 项目，结果提示如下信息
org.springframework.http.converter.HttpMessageNotWritableException: No converter found for return value of type: class com.lcy.pojo.User【原因】找不到返回值类型的转换器，找了好久发现controller返回的是json格式数据
【方案】在maven的pox.xml中只引入Json的依赖时，只引入了“jackson-core”；没有引入 “jackson-databind”，添加了依赖后问题解决了。【提示】当controller标记@ResponseBody后，会用解析器去解析Controller的返回值，解析器会去寻找SpringMvc中注册的HttpMeesageConverter接口的实现类，结果因为没有添加对应的依赖，所以就找不到Json类型的转换器了，添加依赖后就正常了。
【正确的依赖】<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.9.8</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-core -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.9.8</version>
</dependency>
android – java.lang.NoClassDefFoundError：失败的解析：Lio / realm / internal / SharedRealm $Durability
我正在尝试使用Realm创建一个演示应用程序,使用Facebook的stetho浏览default.realm.我每次尝试使用chrome：// inspect>在谷歌浏览器上打开default.realm时出现此错误资源> Web sql> default.realm
这就是我所做的.
的build.gradle
repositories {
maven {
url 'https://github.com/uPhyca/stetho-realm/raw/master/maven-repo'
}
}
dependencies {
...
compile 'com.uphyca:stetho_realm:2.0.0'
compile 'com.facebook.stetho:stetho:1.4.1'
}
我的应用类
public class MyApplication extends Application {
@Override
public void onCreate() {
super.onCreate();
RealmConfiguration realmConfiguration = new RealmConfiguration.Builder(this).build();
Realm.setDefaultConfiguration(realmConfiguration);
Stetho.initialize(
Stetho.newInitializerBuilder(this)
.enableDumpapp(Stetho.defaultDumperPluginsprovider(this))
.enableWebKitInspector(Stetho.defaultInspectorModulesProvider(this))
.build());
}
}
应用程序崩溃时出现此错误：
E/AndroidRuntime: FATAL EXCEPTION: StethoWorker-main-304
Process: example.com.demoapp,PID: 12830
java.lang.NoClassDefFoundError: Failed resolution of: Lio/realm/internal/SharedRealm$Durability;
at com.uphyca.stetho_realm.RealmPeerManager.openSharedRealm(RealmPeerManager.java:136)
at com.uphyca.stetho_realm.RealmPeerManager.openSharedRealm(RealmPeerManager.java:128)
at com.uphyca.stetho_realm.RealmPeerManager.getDatabaseTableNames(RealmPeerManager.java:55)
at com.uphyca.stetho_realm.Database.getDatabaseTableNames(Database.java:124)
at java.lang.reflect.Method.invoke(Native Method)
at com.facebook.stetho.inspector.Methoddispatcher$MethoddispatchHelper.invoke(Methoddispatcher.java:96)
at com.facebook.stetho.inspector.Methoddispatcher.dispatch(Methoddispatcher.java:67)
at com.facebook.stetho.inspector.ChromeDevtoolsServer.handleRemoteRequest(ChromeDevtoolsServer.java:129)
at com.facebook.stetho.inspector.ChromeDevtoolsServer.handleRemoteMessage(ChromeDevtoolsServer.java:111)
at com.facebook.stetho.inspector.ChromeDevtoolsServer.onMessage(ChromeDevtoolsServer.java:87)
at com.facebook.stetho.websocket.WebSocketSession$1.handleTextFrame(WebSocketSession.java:176)
at com.facebook.stetho.websocket.WebSocketSession$1.onCompleteFrame(WebSocketSession.java:136)
at com.facebook.stetho.websocket.ReadHandler.readLoop(ReadHandler.java:44)
at com.facebook.stetho.websocket.WebSocketSession.handle(WebSocketSession.java:45)
at com.facebook.stetho.websocket.WebSocketHandler.doUpgrade(WebSocketHandler.java:117)
at com.facebook.stetho.websocket.WebSocketHandler.handleRequest(WebSocketHandler.java:83)
at com.facebook.stetho.server.http.LightHttpServer.dispatchToHandler(LightHttpServer.java:84)
at com.facebook.stetho.server.http.LightHttpServer.serve(LightHttpServer.java:61)
at com.facebook.stetho.inspector.DevtoolsSocketHandler.onAccepted(DevtoolsSocketHandler.java:52)
at com.facebook.stetho.server.ProtocolDetectingSocketHandler.onSecured(ProtocolDetectingSocketHandler.java:63)
at com.facebook.stetho.server.SecureSocketHandler.onAccepted(SecureSocketHandler.java:33)
at com.facebook.stetho.server.LazySocketHandler.onAccepted(LazySocketHandler.java:36)
at com.facebook.stetho.server.LocalSocketServer$WorkerThread.run(LocalSocketServer.java:167)
Caused by: java.lang.classNotFoundException: Didn't find class "io.realm.internal.SharedRealm$Durability" on path: DexPathList[[dex file "/data/data/example.com.demoapp/files/instant-run/dex/slice-support-annotations-24.2.1_fe2fc8f98c9647365914a4e0809de4cf3bdd5d0f-classes.dex",dex file "/data/data/example.com.demoapp/files/instant-run/dex/slice-slice_9-classes.dex",dex file "/data/data/example.com.demoapp/files/instant-run/dex/slice-slice_8-classes.dex",dex file "/data/data/example.com.demoapp/files/instant-run/dex/slice-slice_7-classes.dex",dex file "/data/data/example.com.demoapp/files/instant-run/dex/slice-slice_6-classes.dex",dex file "/data/data/example.com.demoapp/files/instant-run/dex/slice-slice_5-classes.dex",dex file "/data/data/example.com.demoapp/files/instant-run/dex/slice-slice_4-classes.dex",dex file "/data/data/example.com.demoapp/files/instant-run/dex/slice-slice_3-classes.dex",dex file "/data/data/example.com.demoapp/files/instant-run/dex/slice-slice_2-classes.dex",dex file "/data/data/example.com.demoapp/files/instant-run/dex/slice-slice_1-classes.dex",dex file "/data/data/example.com.demoapp/files/instant-run/dex/slice-slice_0-classes.dex",dex file "/data/data/example.com.demoapp/files/instant-run/dex/slice-realm-android-0.87.4_a528e85f9603c6e64968c150f61258a1621159d0-classes.dex",dex file "/data/data/example.com.demoapp/files/instant-run/dex/slice-jsr305-2.0.1_54f738210fc8c811d7251e6035f61735e3c90b00-classes.dex",dex file "/data/data/example.com.demoapp/files/instant-run/dex/slice-internal_impl-24.2.1_d63817604dbcd8615733073ed4cf6bd29db871e2-classes.dex",dex file "/data/data/example.com.demoapp/files/instant-run/dex/slice-internal_impl-24.2.1_d432bb06a79cf966d865aa5fa44c857409504f1f-classes.dex",dex file "/data/data/example.com.d
解决方法
您正在使用一个极其过时的Realm版本,Stetho-Realm 2.0.0不支持该版本.
您应该使用the 1.x branch of Stetho-Realm打开您的领域.
repositories {
maven {
url 'https://github.com/uPhyca/stetho-realm/raw/master/maven-repo'
}
}
dependencies {
compile 'com.facebook.stetho:stetho:1.3.1'
compile 'com.uphyca:stetho_realm:0.9.0'
}
![Cannot convert value of type [java.lang.String] to required type [java.util.Date] for property &#...](http://www.gvkun.com/zb_users/upload/2025/02/207319ff-43b9-4cb9-8e13-aa20c9a06b061739532811035.jpg "Cannot convert value of type [java.lang.String] to required type [java.util.Date] for property &#...")
Cannot convert value of type [java.lang.String] to required type [java.util.Date] for property &#...
异常信息：
04-Aug-2014 15:49:27.894 SEVERE [http-apr-8080-exec-5] org.apache.catalina.core.StandardWrapperValve.invoke Servlet.service() for servlet [cms] in context with path [/cms] threw exception [Request processing failed; nested exception is org.springframework.validation.BindException: org.springframework.validation.BeanPropertyBindingResult: 6 errors Field error in object ''carContractSearchBox'' on field ''createEndDate'': rejected value []; codes [typeMismatch.carContractSearchBox.createEndDate,typeMismatch.createEndDate,typeMismatch.java.util.Date,typeMismatch]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [carContractSearchBox.createEndDate,createEndDate]; arguments []; default message [createEndDate]]; default message [Failed to convert property value of type ''java.lang.String'' to required type ''java.util.Date'' for property ''createEndDate''; nested exception is java.lang.IllegalStateException: Cannot convert value of type [java.lang.String] to required type [java.util.Date] for property ''createEndDate'': no matching editors or conversion strategy found]先说明一下，我们的项目使用的是 Spring MVC。相应的功能是一个简单的 form 表单查询功能，里面有一些日期字段的查询。
相应的解决办法为：
在对应的 controller 中增加属性编辑器：
@InitBinder
protected void initBinder(WebDataBinder binder) { SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd"); binder.registerCustomEditor(Date.class, new CustomDateEditor(dateFormat, true)); }注意这块的 new CustomDateEditor(dateFormat, true) 中的 true，查看 CustomDateEditor 源码可以看到：
/**
* Create a new CustomDateEditor instance, using the given DateFormat
* for parsing and rendering.
* <p>The "allowEmpty" parameter states if an empty String should
* be allowed for parsing, i.e. get interpreted as null value.
* Otherwise, an IllegalArgumentException gets thrown in that case.
* @param dateFormat DateFormat to use for parsing and rendering
* @param allowEmpty if empty strings should be allowed
*/
public CustomDateEditor(DateFormat dateFormat, boolean allowEmpty) { this.dateFormat = dateFormat; this.allowEmpty = allowEmpty; this.exactDateLength = -1; }当 allowEmpty 字段为 true 的时候 form 表单传递的值可以为空。否则会出现 "" 字符串解析为 date 报错。
关于Idea 中：No converter found for return value of type: class java.util.ArrayList：Json 格式转换问题的介绍已经告一段落，感谢您的耐心阅读，如果想了解更多关于$.ajax 函数调接口，报异常 No converter found for return value of type: class java.util.ArrayList、(HttpMessageNotWritableException ) No converter found for return value of type xxxx、android – java.lang.NoClassDefFoundError：失败的解析：Lio / realm / internal / SharedRealm $Durability、Cannot convert value of type [java.lang.String] to required type [java.util.Date] for property &#...的相关信息，请在本站寻找。
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