Jasper reports Jasperreport使用REST Web服务作为数据集，谓词不能为null

大家好

我正在尝试使用Jasper Report和REST Web服务作为我的数据适配器。我可以预览数据，但无法预览报告，因为它说动词不能为null

这是我的jrxml源代码视图的链接，它太长了，所以我不能在这里发布：

这是我的数据适配器：

每次我尝试预览报告时，都会出现以下错误：

net.sf.jasperreports.engine.JRException: net.sf.jasperreports.engine.JRRuntimeException: net.sf.jasperreports.engine.JRException: Error creating request: net.sf.jasperreports.engine.JRException: The verb can't be null
    at com.jaspersoft.studio.editor.preview.view.control.ReportControler.fillReport(ReportControler.java:545)
    at com.jaspersoft.studio.editor.preview.view.control.ReportControler.access$20(ReportControler.java:520)
    at com.jaspersoft.studio.editor.preview.view.control.ReportControler$5.run(ReportControler.java:401)
    at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
Caused by: net.sf.jasperreports.engine.JRRuntimeException: net.sf.jasperreports.engine.JRException: Error creating request: net.sf.jasperreports.engine.JRException: The verb can't be null
    at net.sf.jasperreports.engine.fill.JRFillSubreport.prepare(JRFillSubreport.java:874)
    at net.sf.jasperreports.components.table.fill.FillTableSubreport.prepareSubreport(FillTableSubreport.java:172)
    at net.sf.jasperreports.components.table.fill.FillTable.prepare(FillTable.java:424)
    at net.sf.jasperreports.engine.fill.JRFillComponentElement.prepare(JRFillComponentElement.java:152)
    at net.sf.jasperreports.engine.fill.JRFillElementContainer.prepareElements(JRFillElementContainer.java:537)
    at net.sf.jasperreports.engine.fill.JRFillBand.fill(JRFillBand.java:411)
    at net.sf.jasperreports.engine.fill.JRFillBand.fill(JRFillBand.java:386)
    at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillTitle(JRVerticalFiller.java:313)
    at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReportStart(JRVerticalFiller.java:247)
    at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReport(JRVerticalFiller.java:115)
    at net.sf.jasperreports.engine.fill.JRBaseFiller.fill(JRBaseFiller.java:582)
    at net.sf.jasperreports.engine.fill.BaseFillHandle$ReportFill.run(BaseFillHandle.java:123)
    at java.lang.Thread.run(Thread.java:745)
Caused by: net.sf.jasperreports.engine.JRException: Error creating request: net.sf.jasperreports.engine.JRException: The verb can't be null
    at com.jaspersoft.webservice.data.util.WebServiceConnector.createRequestForWs(WebServiceConnector.java:187)
    at com.jaspersoft.webservice.data.util.WebServiceConnector.callWS(WebServiceConnector.java:134)
    at com.jaspersoft.webservice.data.query.WebServiceQueryExecuter.createDatasource(WebServiceQueryExecuter.java:168)
    at com.jaspersoft.webservice.data.query.WebServiceQueryExecuter.createDatasource(WebServiceQueryExecuter.java:1)
    at net.sf.jasperreports.engine.fill.JRFillDataset.createQueryDatasource(JRFillDataset.java:1245)
    at net.sf.jasperreports.engine.fill.JRFillDataset.initDatasource(JRFillDataset.java:723)
    at net.sf.jasperreports.engine.fill.BaseReportFiller.setParameters(BaseReportFiller.java:438)
    at net.sf.jasperreports.engine.fill.JRBaseFiller.fill(JRBaseFiller.java:550)
    at net.sf.jasperreports.engine.fill.BaseReportFiller.fill(BaseReportFiller.java:396)
    at net.sf.jasperreports.engine.fill.JRFillSubreport.fillSubreport(JRFillSubreport.java:732)
    at net.sf.jasperreports.engine.fill.JRSubreportRunnable.run(JRSubreportRunnable.java:59)
    at net.sf.jasperreports.engine.fill.AbstractThreadSubreportRunner.run(AbstractThreadSubreportRunner.java:221)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    ... 1 more
Caused by: net.sf.jasperreports.engine.JRException: The verb can't be null
    at com.jaspersoft.webservice.data.util.WebServiceConnector.createRequestForWs(WebServiceConnector.java:178)
    ... 14 more

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我不知道我是否错过了什么，我也不知道我的钥匙。我尝试将RegisteredParticipantsRest连接到主数据集，但没有帮助。我希望有人能帮助我。谢谢

我找到了错误的原因。我必须将数据适配器导出为xml，然后将其设置为RegisteredParticipantsRest上的默认数据适配器