jquery - org.apache.struts2.json.JSONException：属性类型不兼容

Question

我java.util.List<Object[]>通过 JSON-rpc 接收一个 JavaScript 数组，如下所示。

[
    [1, 0.10, 1.00],
    [2, 0.20, 2.00],
    [3, 0.30, 3.00],
    [4, 0.40, 4.00],
    [5, 0.50, 5.00],
    [6, 0.60, 6.00],
    [7, 0.70, 7.00],
    [8, 0.80, 8.00],
    [9, 0.90, 9.00],
    [10, 1.00, 10.00],
    [11, 1.10, 11.00],
    [12, 1.20, 12.00],
    [13, 1.30, 13.00],
    [14, 1.40, 14.00],
    [15, 1.50, 15.00],
    [16, 1.60, 16.00],
    [17, 1.70, 17.00],
    [18, 1.80, 18.00]
]

我需要将这个相同的数组传回服务器（在最后一个维度稍作修改）。

我使用以下函数发回这个数组。

var request;
var timeout;
var itemsArray=[];

function insert()
{
    if(!request)
    {
        var i=0;

        $('input[name="txtCharge[]"]').each(function()
        {
            isNaN($(this).val())||$(this).val()===''?itemsArray[i][2]='':itemsArray[i][2]=eval(eval($(this).val()).toFixed(2));
            i++;
        });

        request = $.ajax({
            dataType:"json",
            type: "POST",
            data: JSON.stringify({jsonrpc:'2.0', method:'insertZoneCharges', id:'jsonrpc', params:[itemsArray]}),
            contentType: "application/json-rpc; charset=utf-8",
            url: "AddZoneChargeList",

            success: function(response)
            {
                alert(response.result);
            },
            complete: function()
            {
                timeout = request = null;
            },
            error: function(request, status, error)
            {
                if(status!=="timeout"&&status!=="abort")
                {
                    alert(status+" : "+error);
                }
            }
        });
        timeout2 = setTimeout(function() {
            if(request)
            {
                request.abort();
                alert("The request has been timed out.");
            }
        }, 300000);
    }
}

循环之后的数组结构与itemsArray第一个片段中提到的完全相同。

这个jQuery函数要调用的方法如下。

@Namespace("/admin_side")
@ResultPath("/WEB-INF/content")
@ParentPackage(value="json-default")
public final class ZoneCharge extends ActionSupport implements Serializable
{
    private static final long serialVersionUID = 1L;

    public ZoneCharge() {}

    //This method is invoked by the given jQuery function. 
    //It should accept the array as a parameter of type List<Object[]> but it doesn't.
    @SMDMethod
    public String insertZoneCharges(@SMDMethodParameter(name="list")List<Object[]> list)
    {
        for(Object[]o:list)
        {
            System.out.println(o[0]+" : "+o[1]+" : "+o[2]);
        }
        return "The action completed successfully.";
    }

    @Action(value = "AddZoneChargeList",
    results = {
        @Result(name = ActionSupport.SUCCESS, type = "json", params = {"enableSMD", "true"})},
    interceptorRefs = {
        @InterceptorRef(value = "json", params = {"enableSMD", "true"})})
    public String insertAction() throws Exception {
        return ActionSupport.SUCCESS;
    }
}

当尝试发出请求时，会引发以下异常。

Feb 19, 2014 6:14:00 AM org.apache.struts2.json.rpc.RPCError error
SEVERE: Incompatible types for property insertZoneCharges
org.apache.struts2.json.JSONException: Incompatible types for property insertZoneCharges
    at org.apache.struts2.json.JSONPopulator.convertToCollection(JSONPopulator.java:254)
    at org.apache.struts2.json.JSONPopulator.convert(JSONPopulator.java:131)
    at org.apache.struts2.json.JSONInterceptor.invoke(JSONInterceptor.java:242)
    at org.apache.struts2.json.JSONInterceptor.intercept(JSONInterceptor.java:133)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
    at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54)
    at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:562)
    at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
    at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:99)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at filter.NoCacheFilter.doFilter(NoCacheFilter.java:25)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:118)
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:84)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:103)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:154)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilter(BasicAuthenticationFilter.java:150)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:199)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:110)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.csrf.CsrfFilter.doFilterInternal(CsrfFilter.java:105)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:57)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:50)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.session.ConcurrentSessionFilter.doFilter(ConcurrentSessionFilter.java:125)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.access.channel.ChannelProcessingFilter.doFilter(ChannelProcessingFilter.java:144)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192)
    at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160)
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.springframework.web.multipart.support.MultipartFilter.doFilterInternal(MultipartFilter.java:119)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1822)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
    at java.lang.Thread.run(Thread.java:722)

为什么该数组没有被映射到List<Object[]>，当它List<Object[]>在接收来自服务器的响应时被正确地映射到一个数组（这是由一个单独的 jQuery 函数完成的，这个问题没有涉及到）？

编辑1：

下一行，

data: JSON.stringify({jsonrpc:'2.0', method:'insertZoneCharges', id:'jsonrpc', params:[itemsArray]})

在给定的 jQuery 函数中对应于以下字符串。

{
    "jsonrpc": "2.0",
    "method": "insertZoneCharges",
    "id": "jsonrpc",
    "params": [
        [
            [1, 0.1, 1],
            [2, 0.2, 2],
            [3, 0.3, 3],
            [4, 0.4, 4],
            [5, 0.5, 5],
            [6, 0.6, 6],
            [7, 0.7, 7],
            [8, 0.8, 8],
            [9, 0.9, 9],
            [10, 1, 10],
            [11, 1.1, 11],
            [12, 1.2, 12],
            [13, 1.3, 13],
            [14, 1.4, 14],
            [15, 1.5, 15],
            [16, 1.6, 16],
            [17, 1.7, 17],
            [18, 1.8, 18]
        ]
    ]
}

这似乎是有效的，应该正确映射到java.util.List<Object[]>而不会导致异常。

编辑2：

这适用于删除泛型类型参数以便列表简单List（而不是<List<Object[]>>）或参数类型为List<List<Object>>. 就像是，

@SMDMethod
public String insertZoneCharges(@SMDMethodParameter(name="list")List<List<Object>> list)
{
    for(List<Object> o:list)
    {
        System.out.println(o);
    }
    return "The action completed successfully.";
}

循环显示以下输出。

[1, 0.1, 1]
[2, 0.2, 2]
[3, 0.3, 3]
[4, 0.4, 4]
[5, 0.5, 5]
[6, 0.6, 6]
[7, 0.7, 7]
[8, 0.8, 8]
[9, 0.9, 9]
[10, 1, 10]
[11, 1.1, 11]
[12, 1.2, 12]
[13, 1.3, 13]
[14, 1.4, 14]
[15, 1.5, 15]
[16, 1.6, 16]
[17, 1.7, 17]
[18, 1.8, 18]

查看输出，应该正确映射 JSON 数组，List<Object[]>但它没有发生。

编辑3：（不是实质性编辑）。

虽然实际的数组在给出的 jQuery 函数中是不可见的，但这可以通过以下 jQuery 函数简单地重现。

function insert()
{
    var a=[[1, 2], [3, 4]];  //Array.

    $.ajax({
            dataType:"json",
            type: "POST",
            data: JSON.stringify({jsonrpc:'2.0', method:'insertZoneCharges', id:'jsonrpc', params:[a]}),
            contentType: "application/json-rpc; charset=utf-8",
            url: "AddZoneChargeList",
            success: function(response)
            {
                alert(response.result);
            },
            complete: function()
            {
                //Do something.
            },
            error: function(request, status, error)
            {
                //Do something.
            }
        });
    }
}

而 SMD 方法的预期方法参数可能是java.util.List<Object[]>或java.util.List<Long[]>。在任何一种情况下，它都会失败并给出异常。

剩下最后一件事。如果有像（在 JavaScript 中）这样的一维数组，

var a=[1, 2];

然后这被正确地映射到Long[]（并因此Object[]）作为 SMD 方法参数。

所以，现在我再也看不到去哪里了。

score 4 · Accepted Answer

使用来源，卢克。如果您查看抛出该异常的类，您会发现它不支持List<anything[]>. 相关行来自org.apache.struts2.json.JSONPopulator.convertToCollection()：

232               // create an object for each element
233               for (int j = 0; j < values.size(); j++) {
234                   Object listValue = values.get(j);
235   
236                   if (itemClass.equals(Object.class)) {
237                       // Object[]
238                       newCollection.add(listValue);
239                   } else if (isJSONPrimitive(itemClass)) {
240                       // primitive array
241                       newCollection.add(this.convertPrimitive(itemClass, listValue, accessor));
242                   } else if (Map.class.isAssignableFrom(itemClass)) {
243                       Object newObject = convertToMap(itemClass, itemType, listValue, accessor);
244                       newCollection.add(newObject);
245                   } else if (List.class.isAssignableFrom(itemClass)) {
246                       Object newObject = convertToCollection(itemClass, itemType, listValue, accessor);
247                       newCollection.add(newObject);
248                   } else if (listValue instanceof Map) {
249                       // array of beans
250                       Object newObject = itemClass.newInstance();
251                       this.populateObject(newObject, (Map) listValue);
252                       newCollection.add(newObject);
253                   } else
254                       throw new JSONException("Incompatible types for property " + accessor.getName());
255               }

此代码将项目添加到列表中，并在决定如何从数据中实例化对象之前经过一系列类型检查。第 237 行的评论具有误导性；它似乎是从复制和粘贴的convertToArray；它所做的只是将当前的 listValue 添加到列表中。同样，第 249 行关于数组的注释也没有创建数组。事实上，这里没有处理数组的代码，所以它直接跳到第 254 行并抛出你看到的异常。该代码似乎缺少几行，如下所示：

else if (itemClass.isArray()) {
   Object newObject = convertToArray(itemClass, itemType, listValue, method);
   newCollection.add(newObject);

...直接从convert()用于处理一维数组的代码中进行翻译 - 正如您所注意到的那样，它可以工作。如果这是疏忽还是故意的，您必须询问 struts 开发人员。看起来您确实被收藏集所困扰。

score 2 · Accepted Answer

您映射参数不正确正确的映射将是

@SMDMethod
public String insertZoneCharges(@SMDMethodParameter(name="list")Object[] list)

jquery - org.apache.struts2.json.JSONException：属性类型不兼容

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