QueryServicesClient.QUERY_MAP_RAW returns n times the first value

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Environment

  • Red Hat JBoss BPM Suite (BPMS) 6.4
  • Executing the following query:

    List<List> result = queryServicesClient.query(QueryStartup.ALL_PROCESS_INSTANCES, QueryServicesClient.QUERY_MAP_RAW, queryFilterSpec, 0, 10000, List.class);
    

Issue

  • QueryServicesClient.QUERY_MAP_RAW returns 10000 times the first raw;

Resolution

This is a bug, reported in Red Hat BPM Suite JIRA RHBPMS-4822 and it is resolved in JBoss BPM Suite 6.4 patch update 7. Upgrade do that version when it is out.

Until this problem is fixed, already existing RawList mapper can be extended and used instead (see attached rawlistextender.zip for source code and jar file) .

Steps to extend RawList mapper are given below:

  • Create new Maven Project - define groupId and artifactId (for instance rawlistextender);
  • Make sure that dependencies are properly set in the pom.xml (jbpm-kie-services is needed in this case) and packaging is jar:
  • Create new class - for instance RawListQueryMapperEx.java:

    package it.demo.bpms;
    
    import java.util.ArrayList;
    import java.util.List;
    
    import org.dashbuilder.dataset.DataColumn;
    import org.dashbuilder.dataset.DataSet;
    import org.jbpm.kie.services.impl.query.mapper.RawListQueryMapper;
    
    public class RawListQueryMapperEx extends RawListQueryMapper {
        private static final long serialVersionUID = 5935133069234696713L;
    
        @Override  
        protected List<Object> buildInstance(DataSet dataSetResult, int index) {
               List<Object> row = new ArrayList<Object>();
    
               for (DataColumn column : dataSetResult.getColumns()) {
                   row.add(dataSetResult.getColumnById(column.getId()).getValues().get(index));
               }
    
               return row;
           }
    
           @Override
           public String getName() {
               return "RawListExtended";
           }
    }        
    
  • Navigate to src/main/resources and create META-INF/services ;

  • Add new File: org.jbpm.services.api.query.QueryResultMapper;
  • Open org.jbpm.services.api.query.QueryResultMapper file and add the name of the extended mapper it.demo.bpms.RawListQueryMapperEx;
  • Save above changes and build the project;
  • Copy built project to the kie-server's WEB-INF/lib folder - for instance:

    $ cp rawlistextender-0.0.1-SNAPSHOT.jar $KIE_SERVER_HOME/deployments/kie-server.war/WEB-INF/lib
    
  • Replace QueryServicesClient.QUERY_MAP_RAW with "RawListExtended" - for instance:

    List<List> result = queryServicesClient.query(QueryStartup.ALL_PROCESS_INSTANCES, "RawListExtended", queryFilterSpec, 0, 10000, List.class);
    
  • Save and redeploy the project;

Root Cause

RawListResultMapper does not properly handle multiple rows due to a type of fetching values from data set.

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