最近很多小伙伴都在问springMVC报错：Unknownreturnvaluetype:java.lang.Integer和springmvcnosuchmethoderror这两个问题，那么本篇文
最近很多小伙伴都在问springMVC 报错：Unknown return value type: java.lang.Integer和springmvc nosuchmethoderror这两个问题，那么本篇文章就来给大家详细解答一下，同时本文还将给你拓展Activiti 表达式报错：Unknown property used in expression、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 [javax.sql.DataSource] for prope...、ELK系列(4) - Elasticsearch cannot write xcontent for unknown value of type class java.math.BigDecimal等相关知识，下面开始了哦！
本文目录一览：- springMVC 报错：Unknown return value type: java.lang.Integer（springmvc nosuchmethoderror）
- Activiti 表达式报错：Unknown property used in expression
- 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 [javax.sql.DataSource] for prope...
- ELK系列(4) - Elasticsearch cannot write xcontent for unknown value of type class java.math.BigDecimal
springMVC 报错：Unknown return value type: java.lang.Integer（springmvc nosuchmethoderror）
controller 层返回值类型为 Integer，运行报错：
Unknown return value type: java.lang.Integer解决办法：在此方法上写上注解 @ResponseBody 。
@responseBody 注解的使用
1、
@responseBody 注解的作用是将 controller 的方法返回的对象通过适当的转换器转换为指定的格式之后，写入到 response 对象的 body 区，通常用来返回 JSON 数据或者是 XML
数据，需要注意的呢，在使用此注解之后不会再走试图处理器，而是直接将数据写入到输入流中，他的效果等同于通过 response 对象输出指定格式的数据。
2、
@RequestMapping("/login")
@ResponseBody
public User login(User user){
return user;
}
User 字段：userName pwd
那么在前台接收到的数据为：''{"userName":"xxx","pwd":"xxx"}''
效果等同于如下代码：
@RequestMapping("/login")
public void login(User user, HttpServletResponse response){
response.getWriter.write(JSONObject.fromObject(user).toString());
}
Activiti 表达式报错：Unknown property used in expression
public class Leave implements Serializable{
private static final long serialVersionUID = 1L;
private String name;
private Integer day;
private Integer total = 0;
// 省略 set,get
}
bpmn 里面配置的是：
<conditionExpression xsi:type="tFormalExpression"><![CDATA[${reason[0].total < 10}]]></conditionExpression>
启动流程实例的时候，是这样的
Map<String, Object> vars = new HashMap<>();
vars.put ("reason", Arrays.asList (new Leave ("白展堂", 2)));
processEngine.getRuntimeService().startProcessInstanceByKey("dingcan", vars);
随后，执行报错
org.activiti.engine.ActivitiException: Unknown property used in expression: ${reason[0].total < 10} at org.activiti.engine.impl.el.JuelExpression.getValue(JuelExpression.java:53) at org.activiti.engine.impl.el.UelExpressionCondition.evaluate(UelExpressionCondition.java:37) at org.activiti.engine.impl.bpmn.behavior.InclusiveGatewayActivityBehavior.execute(InclusiveGatewayActivityBehavior.java:63) at org.activiti.engine.impl.pvm.runtime.AtomicOperationActivityExecute.execute(AtomicOperationActivityExecute.java:60) at org.activiti.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:96) at org.activiti.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:621) at org.activiti.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:616) at org.activiti.engine.impl.pvm.runtime.AtomicOperationTransitionNotifyListenerStart.eventNotificationsCompleted(AtomicOperationTransitionNotifyListenerStart.java:52) at org.activiti.engine.impl.pvm.runtime.AbstractEventAtomicOperation.execute(AbstractEventAtomicOperation.java:56) at org.activiti.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:96) at org.activiti.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:621) at org.activiti.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:616) at org.activiti.engine.impl.pvm.runtime.AbstractEventAtomicOperation.execute(AbstractEventAtomicOperation.java:49) at org.activiti.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:96) at org.activiti.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:621)
请问，这是什么错
![Cannot convert value of type [java.lang.String] to required type [java.util.Date] for property &#...](http://www.gvkun.com/zb_users/upload/2025/01/518fa8e7-2c09-474e-b437-12de61a4d2061738255274346.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。
![Cannot convert value of type [java.lang.String] to required type [javax.sql.DataSource] for prope...](http://www.gvkun.com/zb_users/upload/2025/01/033e3d76-e840-4159-87c5-00c15ea9d00a1738255274768.jpg "Cannot convert value of type [java.lang.String] to required type [javax.sql.DataSource] for prope...")
Cannot convert value of type [java.lang.String] to required type [javax.sql.DataSource] for prope...
org.springframework.beans.factory.BeanCreationException: Error creating bean with name ''sqlSessionFactory'' defined in URL [jar:file:/G:/idjavacode/pygqingmu2parent/pyg_qingmu2_service_sellergoods/target/pyg_qingmu2_service_sellergoods/WEB-INF/lib/pyg_qingmu2_dao-1.0-SNAPSHOT.jar!/spring/applicationContext_dao.xml]: Initialization of bean failed; nested exception is org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type [java.lang.String] to required type [javax.sql.DataSource] for property ''dataSource''; nested exception is java.lang.IllegalStateException: Cannot convert value of type [java.lang.String] to required type [javax.sql.DataSource] for property ''dataSource'': no matching editors or conversion strategy found
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:753)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538)
at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:446)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:328)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4792)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5256)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:754)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:730)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:734)
at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1736)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:300)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:483)
at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:432)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:300)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1468)
at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76)
at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1309)
at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1401)
at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:829)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:361)
at sun.rmi.transport.Transport$1.run(Transport.java:200)
at sun.rmi.transport.Transport$1.run(Transport.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:683)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type [java.lang.String] to required type [javax.sql.DataSource] for property ''dataSource''; nested exception is java.lang.IllegalStateException: Cannot convert value of type [java.lang.String] to required type [javax.sql.DataSource] for property ''dataSource'': no matching editors or conversion strategy found
15-Apr-2019 16:37:27.986 严重 [RMI TCP Connection(3)-127.0.0.1] org.apache.catalina.core.StandardContext.startInternal One or more listeners failed to start. Full details will be found in the appropriate container log file
15-Apr-2019 16:37:27.987 严重 [RMI TCP Connection(3)-127.0.0.1] org.apache.catalina.core.StandardContext.startInternal Context [] startup failed due to previous errors
[2019-04-15 04:37:28,066] Artifact pyg_qingmu2_service_sellergoods:war exploded: Error during artifact deployment. See server log for details.
at org.springframework.beans.AbstractNestablePropertyAccessor.convertIfNecessary(AbstractNestablePropertyAccessor.java:591)
at org.springframework.beans.AbstractNestablePropertyAccessor.convertForProperty(AbstractNestablePropertyAccessor.java:603)
at org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:204)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.convertForProperty(AbstractAutowireCapableBeanFactory.java:1527)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1486)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1226)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543)
... 56 more
Caused by: java.lang.IllegalStateException: Cannot convert value of type [java.lang.String] to required type [javax.sql.DataSource] for property ''dataSource'': no matching editors or conversion strategy found
at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:302)
at org.springframework.beans.AbstractNestablePropertyAccessor.convertIfNecessary(AbstractNestablePropertyAccessor.java:576)
... 62 more
这里应该使用 ref 进行引入。没有找到数据源然后开始一路报错
ELK系列(4) - Elasticsearch cannot write xcontent for unknown value of type class java.math.BigDecimal
问题与分析
在使用Elasticsearch进行index数据时，发现报错如下：
java.lang.IllegalArgumentException: cannot write xcontent for unknown value of type class java.math.BigDecimal
at org.elasticsearch.common.xcontent.XContentBuilder.unknownValue(XContentBuilder.java:755)
at org.elasticsearch.common.xcontent.XContentBuilder.value(XContentBuilder.java:726)
at org.elasticsearch.common.xcontent.XContentBuilder.field(XContentBuilder.java:711)
at org.elasticsearch.index.query.BaseTermQueryBuilder.doXContent(BaseTermQueryBuilder.java:154)
at org.elasticsearch.index.query.AbstractQueryBuilder.toXContent(AbstractQueryBuilder.java:82)
at org.elasticsearch.index.query.BoolQueryBuilder.doXArrayContent(BoolQueryBuilder.java:275)
at org.elasticsearch.index.query.BoolQueryBuilder.doXContent(BoolQueryBuilder.java:256)
at org.elasticsearch.index.query.AbstractQueryBuilder.toXContent(AbstractQueryBuilder.java:82)
at org.elasticsearch.common.xcontent.XContentBuilder.value(XContentBuilder.java:779)
at org.elasticsearch.common.xcontent.XContentBuilder.value(XContentBuilder.java:772)
at org.elasticsearch.common.xcontent.XContentBuilder.field(XContentBuilder.java:764)
at org.elasticsearch.search.builder.SearchSourceBuilder.toXContent(SearchSourceBuilder.java:1184)
at org.elasticsearch.common.xcontent.XContentHelper.toXContent(XContentHelper.java:349)
at org.elasticsearch.search.builder.SearchSourceBuilder.toString(SearchSourceBuilder.java:1558)
at org.elasticsearch.search.builder.SearchSourceBuilder.toString(SearchSourceBuilder.java:1553)
at java.lang.String.valueOf(String.java:2994)
at java.lang.StringBuilder.append(StringBuilder.java:131)
at org.elasticsearch.action.search.SearchRequest.toString(SearchRequest.java:516)
从异常信息看，显然ES无法接受BigDecimal类型，经过百度，也确实如此。在一篇博文评论中解释如下：
应该是客户端代码里将查询的数值定义成了java.math.BigDecimal，而ES不支持这个类型。之所以2.2没有问题，是因为之前的transport client发送数据之前将其序列化成了json，而在5.x以后，使用的内部的transport protocol，数据类型如果不匹配会抛错误。
所以数据类型的定义上，需要使用ES支持的类型。
<!-- more -->
解决方案
方案一：转变成其他ES支持的数据类型
我使用的是6.4.2版本的Elasticsearch，该版本尚不支持BigDecimal或者BigInteger的数据类型，所以在index到Elasticsearch之前，需要转换成其他数据类型，这里要注意不要数据溢出了:
- BigDecimal要转变成Double类型
- BigInteger要转变成Long类型
方案二：使用更高版本的ES
我在看6.7.1版本的Elasticsearch源码时发现已经可以支持BigDecimal或者BigInteger的数据类型了，所以直接使用该版本或更高版本的就行了。
下面附上两个版本的支持的数据类型的源码：
- 6.4.2版本的Elasticsearch相关源码
Map<Class<?>, Writer> writers = new HashMap<>();
writers.put(Boolean.class, (b, v) -> b.value((Boolean) v));
writers.put(Byte.class, (b, v) -> b.value((Byte) v));
writers.put(byte[].class, (b, v) -> b.value((byte[]) v));
writers.put(Date.class, XContentBuilder::timeValue);
writers.put(Double.class, (b, v) -> b.value((Double) v));
writers.put(double[].class, (b, v) -> b.values((double[]) v));
writers.put(Float.class, (b, v) -> b.value((Float) v));
writers.put(float[].class, (b, v) -> b.values((float[]) v));
writers.put(Integer.class, (b, v) -> b.value((Integer) v));
writers.put(int[].class, (b, v) -> b.values((int[]) v));
writers.put(Long.class, (b, v) -> b.value((Long) v));
writers.put(long[].class, (b, v) -> b.values((long[]) v));
writers.put(Short.class, (b, v) -> b.value((Short) v));
writers.put(short[].class, (b, v) -> b.values((short[]) v));
writers.put(String.class, (b, v) -> b.value((String) v));
writers.put(String[].class, (b, v) -> b.values((String[]) v));
writers.put(Locale.class, (b, v) -> b.value(v.toString()));
writers.put(Class.class, (b, v) -> b.value(v.toString()));
writers.put(ZonedDateTime.class, (b, v) -> b.value(v.toString()));
writers.put(Calendar.class, XContentBuilder::timeValue);
writers.put(GregorianCalendar.class, XContentBuilder::timeValue);
- 6.7.1版本的Elasticsearch相关源码
Map<Class<?>, Writer> writers = new HashMap<>();
writers.put(Boolean.class, (b, v) -> b.value((Boolean) v));
writers.put(Byte.class, (b, v) -> b.value((Byte) v));
writers.put(byte[].class, (b, v) -> b.value((byte[]) v));
writers.put(Date.class, XContentBuilder::timeValue);
writers.put(Double.class, (b, v) -> b.value((Double) v));
writers.put(double[].class, (b, v) -> b.values((double[]) v));
writers.put(Float.class, (b, v) -> b.value((Float) v));
writers.put(float[].class, (b, v) -> b.values((float[]) v));
writers.put(Integer.class, (b, v) -> b.value((Integer) v));
writers.put(int[].class, (b, v) -> b.values((int[]) v));
writers.put(Long.class, (b, v) -> b.value((Long) v));
writers.put(long[].class, (b, v) -> b.values((long[]) v));
writers.put(Short.class, (b, v) -> b.value((Short) v));
writers.put(short[].class, (b, v) -> b.values((short[]) v));
writers.put(String.class, (b, v) -> b.value((String) v));
writers.put(String[].class, (b, v) -> b.values((String[]) v));
writers.put(Locale.class, (b, v) -> b.value(v.toString()));
writers.put(Class.class, (b, v) -> b.value(v.toString()));
writers.put(ZonedDateTime.class, (b, v) -> b.value(v.toString()));
writers.put(Calendar.class, XContentBuilder::timeValue);
writers.put(GregorianCalendar.class, XContentBuilder::timeValue);
writers.put(BigInteger.class, (b, v) -> b.value((BigInteger) v));
writers.put(BigDecimal.class, (b, v) -> b.value((BigDecimal) v));
可以发现，在6.7.1版本的源码里，多出了最后的两种数据类型的支持：BigInteger和BigDecimal。
参考链接
- elastic search 5.4.版本，java api 调用出现：can not write type [class java.math.BigDecimal]
今天的关于springMVC 报错：Unknown return value type: java.lang.Integer和springmvc nosuchmethoderror的分享已经结束，谢谢您的关注，如果想了解更多关于Activiti 表达式报错：Unknown property used in expression、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 [javax.sql.DataSource] for prope...、ELK系列(4) - Elasticsearch cannot write xcontent for unknown value of type class java.math.BigDecimal的相关知识，请在本站进行查询。
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