The code sample below provides an example of the task query service client code:

/**
 * WFClientSample
 */
package oracle.bpel.services.workflow.samples;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import oracle.bpel.services.workflow.IWorkflowConstants;
import oracle.bpel.services.workflow.WorkflowException;
import oracle.bpel.services.workflow.client.IWorkflowServiceClient;
import oracle.bpel.services.workflow.client.WorkflowServiceClientFactory;
import oracle.bpel.services.workflow.client.IWorkflowServiceClientConstants
 .CONNECTION_PROPERTY;
import oracle.bpel.services.workflow.query.ITaskQueryService;
import oracle.bpel.services.workflow.query.ITaskQueryService.AssignmentFilter;
import oracle.bpel.services.workflow.query.ITaskQueryService.OptionalInfo;
import oracle.bpel.services.workflow.repos.Ordering;
import oracle.bpel.services.workflow.repos.Predicate;
import oracle.bpel.services.workflow.repos.TableConstants;
import oracle.bpel.services.workflow.verification.IWorkflowContext;

public class WFClientSample {

  public static List  runClient(String clientType) throws WorkflowException {
      try {
      
         IWorkflowServiceClient wfSvcClient = null;
         ITaskQueryService taskQuerySvc = null;
         IWorkflowContext wfCtx = null;

         // 1. this step is optional since configuration can be set in  wf_client_
             config.xml file
         Map<CONNECTION_PROPERTY, String> properties = new HashMap<CONNECTION_
PROPERTY, String>();
         if (WorkflowServiceClientFactory.REMOTE_CLIENT.equals(clientType)) {
           properties.put(CONNECTION_PROPERTY.EJB_INITIAL_CONTEXT_FACTORY,
 "weblogic.jndi.WLInitialContextFactory");
           properties.put(CONNECTION_PROPERTY.EJB_PROVIDER_URL,
 "t3://myhost.us.example.com:7001");
           properties.put(CONNECTION_PROPERTY.EJB_SECURITY_CREDENTIALS,
 "weblogic");
           properties.put(CONNECTION_PROPERTY.EJB_SECURITY_PRINCIPAL, "weblogic");
         } else if (WorkflowServiceClientFactory.SOAP_CLIENT.equals(clientType)) {
           properties.put(CONNECTION_PROPERTY.SOAP_END_POINT_ROOT,
 "http://myhost:7001");
           properties.put(CONNECTION_PROPERTY.SOAP_IDENTITY_
PROPAGATION,"non-saml"); // optional
         } 
         // 2. gets IWorkflowServiceClient for specified client type
         wfSvcClient =
 WorkflowServiceClientFactory.getWorkflowServiceClient(clientType, properties,
 null);

         // 3. gets ITaskQueryService instance
         taskQuerySvc = wfSvcClient.getTaskQueryService();

         // 4. gets IWorkflowContext instance
         wfCtx = taskQuerySvc.authenticate("jcooper", "welcome1".toCharArray(),
 "jazn.com");

         // 5. creates displayColumns
         List<String> displayColumns = new ArrayList<String>(8);
         displayColumns.add("TASKID");
         displayColumns.add("TASKNUMBER");
         displayColumns.add("TITLE");
         displayColumns.add("CATEGORY");

         // 6. creates optionalInfo
         List<ITaskQueryService.OptionalInfo> optionalInfo = new
 ArrayList<ITaskQueryService.OptionalInfo>();
         optionalInfo.add(ITaskQueryService.OptionalInfo.DISPLAY_INFO);

         // 7. creates assignmentFilter
         AssignmentFilter assignmentFilter = AssignmentFilter.MY_AND_GROUP;

         // 8. creates predicate
         List<String> stateList = new ArrayList<String>();
         stateList.add(IWorkflowConstants.TASK_STATE_ASSIGNED);
         stateList.add(IWorkflowConstants.TASK_STATE_INFO_REQUESTED);
         Predicate predicate = new Predicate(TableConstants.WFTASK_STATE_COLUMN,
 Predicate.OP_IN, stateList);

         // 9. creates ordering
         Ordering ordering = new Ordering(TableConstants.WFTASK_DUEDATE_COLUMN,
 true, false);
         ordering.addClause(TableConstants.WFTASK_CREATEDDATE_COLUMN, true,
 false);

         // 10. calls service - query tasks 
         List taskList = taskQuerySvc.queryTasks(wfCtx, 
                                                (List<String>) displayColumns, 
                                                (List<OptionalInfo>) optionalInfo, 
                                                (AssignmentFilter)
                                                  assignmentFilter, 
                                                (String) null, // keywords is
 optional (see javadoc)
 // optional
                                                 predicate, 
                                                 ordering,
                                                 0,    // starting row 
                                                 100); // ending row for paging, 0
                                                    if no paging
      
         // Enjoy result
         System.out.println("Successfuly get list of tasks for client type: " +
            clientType +
                            ". The list size is " + taskList.size());
         return taskList;
      } catch (WorkflowException e) {
         System.out.println("Error occurred");
         e.printStackTrace();
         throw e;
      }
   }
   
   public static void main(String args[]) throws Exception {
      runClient(WorkflowServiceClientFactory.REMOTE_CLIENT);
      runClient(WorkflowServiceClientFactory.SOAP_CLIENT);
   }  
  
}