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POAjax pass a "Map" object to Spring MVC Controller
 

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  1. POAjax pass a "Map" object to Spring MVC Controller
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    <p>It seems like Spring MVC doesn't know how to map a javascript "map" to a Java map object</p> <p>In the web UI, say, foo.jsp, </p> <pre><code>&lt;script&gt; var myMap = {}; myMap["people"] = ["Alex","Bob","Charles","Dave"]; myMap["fruit"] = ["Apple","Orange"]; $.ajax({ type : "POST", url : "/myURL", data : "myMap=" + myMap, // I tried "myMap="+JSON.stringify(myMap), as well, it doesn't work neither success : function(response) { alert("Success! response = " + response); }, error : function(e) { alert("AJAX error"); } }); &lt;/script&gt; </code></pre> <p>On the server side, I have a data model class just to receive data from the Web UI</p> <pre><code>@Setter @Getter class Parameters { private Map&lt;String, List&lt;String&gt;&gt; myMap; //this is the java class I want to map the string to } </code></pre> <p>And in the controller,</p> <pre><code>@RequestMapping(value = "/myURL", method = RequestMethod.POST) @ResponseBody public List&lt;String&gt; fooControl(Parameters parameters ) { // do something with parameters ... } </code></pre> <p>The error I got on the server side is like,</p> <pre><code>[tomcat:launch] Aug 14, 2013 3:12:37 PM org.apache.catalina.core.StandardWrapperValve invoke [tomcat:launch] SEVERE: Servlet.service() for servlet dispatcher threw exception [tomcat:launch] org.springframework.validation.BindException: org.springframework.validation.BeanPropertyBindingResult: 1 errors [tomcat:launch] Field error in object 'Parameters ' on field 'myMap': rejected value [{"people":["Alex","Bob","Charles","Dave"],"fruit": ["Apple","Orange"]}]; codes [typeMismatch.repairInfomationParametersExperimental.constraints,typeMismatch.constraints,typeMismatch.java.util.Map,typeMismatch]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [repairInfomationParametersExperimental.constraints,constraints]; arguments []; default message [constraints]]; default message [Failed to convert property value of type 'java.lang.String' to required type 'java.util.Map' for property 'constraints'; nested exception is java.lang.IllegalStateException: Cannot convert value of type [java.lang.String] to required type [java.util.Map] for property 'myMap': no matching editors or conversion strategy found] </code></pre> <p>I guess there is a way to tell Spring how to map that JSON format string a Java Map?</p> <p>Thanks!</p>
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