select2 calls wrong parameter for page provider

1. setup a custom document with a Multiple Generic Widget
2. specify a custom page provider in the Document page provider name (see ppSetup.png)
3. here is an example of page provider:

   <extension target="org.nuxeo.ecm.platform.query.api.PageProviderService" point="providers">
   	<coreQueryPageProvider name="CATEGORY_ESCAPE">
   		<pattern quoteParameters="true" escapeParameters="true">
   			SELECT * FROM Document WHERE ecm:currentLifeCycleState !='deleted' AND ecm:isCheckedInVersion = 0 AND testdocument:myVal ILIKE ?
   		</pattern>
   		<pageSize>10</pageSize>
   	</coreQueryPageProvider>
   </extension>
   

4. Create a document and try to search through the generic widget. This ends up with an error like in popUpError.png and 500error.png
5. on the server side, the following stack can be seen:

   2017-03-27 12:04:26,327 WARN  [http-bio-0.0.0.0-8080-exec-32] [org.nuxeo.ecm.webengine.app.WebEngineExceptionMapper] Exception in JAX-RS processing
   org.nuxeo.ecm.webengine.WebException: Failed to invoke operation: Document.PageProvider
   	at org.nuxeo.ecm.webengine.WebException.newException(WebException.java:136)
   	at org.nuxeo.ecm.webengine.WebException.newException(WebException.java:123)
   	at org.nuxeo.ecm.automation.server.jaxrs.ExecutableResource.doPost(ExecutableResource.java:87)
   	at sun.reflect.GeneratedMethodAccessor1046.invoke(Unknown Source)
   	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   	at java.lang.reflect.Method.invoke(Method.java:498)
   	at com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60)
   	at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ObjectOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:258)
   	at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)
   	at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:302)
   	at com.sun.jersey.server.impl.uri.rules.SubLocatorRule.accept(SubLocatorRule.java:137)
   	at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
   	at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)
   	at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
   	at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)
   	at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1511)
   	at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1442)
   	at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1391)
   	at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1381)
   	at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:416)
   	at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:538)
   	at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:716)
   	at org.nuxeo.ecm.webengine.app.jersey.WebEngineServlet.containerService(WebEngineServlet.java:178)
   	at org.nuxeo.ecm.webengine.app.jersey.WebEngineServlet.service(WebEngineServlet.java:153)
   	at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
   	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
   	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
   	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
   	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
   	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
   	at org.nuxeo.ecm.webengine.jaxrs.session.SessionCleanupFilter.run(SessionCleanupFilter.java:45)
   	at org.nuxeo.ecm.webengine.jaxrs.HttpFilter.doFilter(HttpFilter.java:43)
   	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
   	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
   	at org.nuxeo.ecm.webengine.app.WebEngineFilter.doFilter(WebEngineFilter.java:93)
   	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
   	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
   	at org.nuxeo.ecm.webengine.jaxrs.context.RequestContextFilter.run(RequestContextFilter.java:42)
   	at org.nuxeo.ecm.webengine.jaxrs.HttpFilter.doFilter(HttpFilter.java:43)
   	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
   	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
   	at org.nuxeo.wss.servlet.BaseWSSFilter.doFilter(BaseWSSFilter.java:131)
   	at org.nuxeo.wss.servlet.FailSafeWSSFilter.doFilter(FailSafeWSSFilter.java:56)
   	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
   	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
   	at org.nuxeo.ecm.platform.web.common.requestcontroller.filter.NuxeoThreadTrackerFilter.doFilter(NuxeoThreadTrackerFilter.java:28)
   	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
   	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
   	at org.nuxeo.ecm.core.management.jtajca.internal.Log4jWebFilter.doFilter(Log4jWebFilter.java:67)
   	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
   	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
   	at org.nuxeo.ecm.platform.ui.web.rest.FancyURLFilter.doFilter(FancyURLFilter.java:129)
   	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
   	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
   	at org.nuxeo.ecm.platform.web.common.requestcontroller.filter.NuxeoRequestControllerFilter.doFilter(NuxeoRequestControllerFilter.java:140)
   	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
   	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
   	at org.nuxeo.ecm.webdav.service.WIRequestFilter.doFilter(WIRequestFilter.java:59)
   	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
   	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
   	at org.nuxeo.ecm.platform.ui.web.auth.NuxeoAuthenticationFilter.doFilterInternal(NuxeoAuthenticationFilter.java:603)
   	at org.nuxeo.ecm.platform.ui.web.auth.service.NuxeoAuthFilterChain.doFilter(NuxeoAuthFilterChain.java:36)
   	at org.nuxeo.ecm.platform.ui.web.auth.oauth.NuxeoOAuthFilter.doFilter(NuxeoOAuthFilter.java:119)
   	at org.nuxeo.ecm.platform.ui.web.auth.service.NuxeoAuthFilterChain.doFilter(NuxeoAuthFilterChain.java:34)
   	at org.nuxeo.ecm.platform.ui.web.auth.oauth2.NuxeoOAuth2Filter.doFilter(NuxeoOAuth2Filter.java:68)
   	at org.nuxeo.ecm.platform.ui.web.auth.service.NuxeoAuthFilterChain.doFilter(NuxeoAuthFilterChain.java:34)
   	at org.nuxeo.ecm.platform.ui.web.auth.NuxeoAuthenticationFilter.doFilter(NuxeoAuthenticationFilter.java:413)
   	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
   	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
   	at org.nuxeo.ecm.platform.web.common.requestcontroller.filter.NuxeoCorsFilter.doFilter(NuxeoCorsFilter.java:68)
   	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
   	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
   	at org.nuxeo.ecm.platform.web.common.exceptionhandling.NuxeoExceptionFilter.doFilter(NuxeoExceptionFilter.java:78)
   	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
   	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
   	at org.nuxeo.ecm.platform.web.common.encoding.NuxeoEncodingFilter.doFilter(NuxeoEncodingFilter.java:73)
   	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
   	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
   	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
   	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
   	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:503)
   	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
   	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
   	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
   	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:421)
   	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)
   	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
   	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
   	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
   	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
   	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
   	at java.lang.Thread.run(Thread.java:745)
   Caused by: org.nuxeo.ecm.automation.TraceException: 
   
   ****** chain ******
   Name: Document.PageProvider
   Exception: OperationException
   Caught error: Failed to invoke operation Document.PageProvider
   Caused by: java.lang.ArrayIndexOutOfBoundsException: 1
   ****** Hierarchy calls ******
   	org.nuxeo.ecm.automation.core.operations.services.DocumentPageProviderOperation
   
   	at org.nuxeo.ecm.automation.core.impl.OperationServiceImpl.run(OperationServiceImpl.java:229)
   	at org.nuxeo.ecm.automation.core.impl.OperationServiceImpl.run(OperationServiceImpl.java:114)
   	at org.nuxeo.ecm.automation.server.jaxrs.OperationResource.execute(OperationResource.java:51)
   	at org.nuxeo.ecm.automation.server.jaxrs.ExecutableResource.doPost(ExecutableResource.java:61)
   	... 89 more
   Caused by: org.nuxeo.ecm.automation.OperationException: Failed to invoke operation Document.PageProvider
   	at org.nuxeo.ecm.automation.core.impl.InvokableMethod.invoke(InvokableMethod.java:151)
   	at org.nuxeo.ecm.automation.core.impl.CompiledChainImpl.doInvoke(CompiledChainImpl.java:127)
   	at org.nuxeo.ecm.automation.core.impl.CompiledChainImpl.invoke(CompiledChainImpl.java:113)
   	at org.nuxeo.ecm.automation.core.impl.OperationServiceImpl.run(OperationServiceImpl.java:205)
   	... 92 more
   Caused by: java.lang.ArrayIndexOutOfBoundsException: 1
   	at org.nuxeo.ecm.platform.query.nxql.NXQLQueryBuilder.getQuery(NXQLQueryBuilder.java:257)
   	at org.nuxeo.ecm.platform.query.nxql.CoreQueryDocumentPageProvider.buildQuery(CoreQueryDocumentPageProvider.java:228)
   	at org.nuxeo.ecm.platform.query.nxql.CoreQueryDocumentPageProvider.getCurrentPage(CoreQueryDocumentPageProvider.java:110)
   	at org.nuxeo.ecm.automation.core.util.PaginablePageProvider.<init>(PaginablePageProvider.java:39)
   	at org.nuxeo.ecm.automation.jaxrs.io.documents.PaginableDocumentModelListImpl.<init>(PaginableDocumentModelListImpl.java:46)
   	at org.nuxeo.ecm.automation.core.operations.services.DocumentPageProviderOperation.run(DocumentPageProviderOperation.java:247)
   	at sun.reflect.GeneratedMethodAccessor1055.invoke(Unknown Source)
   	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   	at java.lang.reflect.Method.invoke(Method.java:498)
   	at org.nuxeo.ecm.automation.core.impl.InvokableMethod.doInvoke(InvokableMethod.java:130)
   	at org.nuxeo.ecm.automation.core.impl.InvokableMethod.invoke(InvokableMethod.java:143)
   	... 95 more

6. Checking the JSON payload (see JSONPayload.png) the parameter for the page provider is called pageProviderName
7. Checking the DocumentPageProviderOperation.java code shows the parameters is in fact providerName:

       @Param(name = "providerName", required = false)
       protected String providerName;
   

8. This can be easily reproduced by doing a rest call on the Repository.PageProvider operation. Using the right parameter name it obviously works.

Please note this does not happen with Multiple Document Suggestion but with select2Multiple and Multiple Generic Suggestion. This may happen with other widgets.

Multiple Document Suggestion seems to call Seam.RunOperation with the following payload:

{"params":{"id":"Document.PageProvider","conversationId":"0NXMAIN"},"context":{"multiple":"true","readonly":"false","pageProviderName":"default_document_suggestion","documentSchemas":"dublincore,common","width":"100%","restoreSeamCtx":"true","minChars":"3","selectionFormatter":"docSelectionDefaultFormatter","suggestionFormatter":"docEntryDefaultFormatter","operationId":"Document.PageProvider","placeholder":"Select a value","lang":"en","searchTerm":"aozie","providerName":"default_document_suggestion","page":"0","pageSize":"20","quotePatternParameters":false}}

where both the incorrect and the correct parameter names are present.