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This guide provides instructions on how to Delegate , Release & Nominate Task of a SAP BPM Process using BPM API as a Restful Service.


Applies to:

This Document Holds good for all CE 7.3 SP05 onwards. This service can be called from UI5 Screen as an Ajax call.


Summary:

This guide describes step-by-step how to Complete Task of a BPM Process using BPM API as a rest full service.


About Me:

Piyas Kumar Das

As a Sr. Netweaver Consultant, I’ve been undertaking consulting assignments leveraging on my undermentioned NetWeaver skills.

  • Business Process Management (SAP NW BPM)
  • Restful Services using BPM api to be used in UI5 Screens.
  • SAP Web Dynpro Java (SAP WD4J)
  • SAP Business Rules Management (SAP BRMS)
  • SAP Composit Application Framework (SAP CAF)
  • Master Data Management (SAP NW MDM)
  • Enterprise Portal (SAP EP)
  • Services creation using NWDS (SAP EJB)
  • Enterprise SOA


Prerequisites:

You should have read through the document :

How to Start a BPM Process using BPM API as a RESTful service.

How to Complete Task of a BPM Process using BPM API as a rest full service.

How to get Task Details of a BPM Process using BPM API as a rest full service.


We will be discussing following points in detail in this document –


  1. Adding Libraries.
  2. Setting up the foundation for using Libraries.
  3. Creating Deploy-able Object.
  4. Accessing the methods exposed.


Adding Libraries:


Step 1 : Refer the document to add libraries.


Setting up the foundation for using Library:


Step 1 to Step 4 is same as mentioned in the document.


Step 5 : Create a restful service class file and write a code as shown below or if you are continuing from the document then just copy past the methods only.



import java.io.StringReader;
import java.net.URI;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import javax.ws.rs.Consumes;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.xml.sax.InputSource;
import bo.Material;
import bo.MaterialCreation;
import bo.TaskHeader;
import bo.TaskHeaders;
import com.sap.bpm.api.BPMFactory;
import com.sap.bpm.exception.api.BPMException;
import com.sap.bpm.pm.api.ProcessDefinition;
import com.sap.bpm.pm.api.ProcessDefinitionManager;
import com.sap.bpm.pm.api.ProcessStartEvent;
import com.sap.bpm.pm.api.ProcessStartManager;
import com.sap.bpm.tm.api.Status;
import com.sap.bpm.tm.api.TaskAbstract;
import com.sap.bpm.tm.api.TaskDetail;
import com.sap.bpm.tm.api.TaskInstanceManager;
import com.sap.security.api.IUser;
import com.sap.tc.logging.Location;
import commonj.sdo.DataObject;
import commonj.sdo.helper.XMLHelper;
@Path("/MaterialCreationService")
@Produces({MediaType.APPLICATION_XML})
public class MaterialCreationToRestService {
  private static final Location location = Location.getLocation(MaterialCreationToRestService.class);
  private final String PRE_TASK_URI = "bpm://bpm.sap.com/task-instance/";
  @Path("/delegate/{task-id}")
  @POST
  @Consumes({MediaType.APPLICATION_JSON})
  @Produces({MediaType.APPLICATION_JSON})
  public String delegate(@PathParam("task-id") String taskInstanceId, IUser newOwner) throws Exception
    {
    String log = null;
    try{
    //Retrieve the TaskInstanceManager
    TaskInstanceManager taskInstanceManager = BPMFactory.getTaskInstanceManager();
    taskInstanceId = PRE_TASK_URI + taskInstanceId;
    URI taskInstId = new URI(taskInstanceId);
    //Claim the Task First
    taskInstanceManager.claim(taskInstId);
    taskInstanceManager.delegate(taskInstId, newOwner);
        log = "Task delegated";
    }
    catch (Exception e)
    {
    e.printStackTrace();
    System.err.println(e);
    log = "Task in Exception "+e.getLocalizedMessage();
    }
    return log;
    }
  @Path("/claim/{task-id}")
  @POST
  @Consumes({MediaType.APPLICATION_JSON})
  @Produces({MediaType.APPLICATION_JSON})
  public String claim(@PathParam("task-id") String taskInstanceId) throws Exception
    {
    String log = null;
    try{
    //Retrieve the TaskInstanceManager
    TaskInstanceManager taskInstanceManager = BPMFactory.getTaskInstanceManager();
    taskInstanceId = PRE_TASK_URI + taskInstanceId;
    URI taskInstId = new URI(taskInstanceId);
    taskInstanceManager.claim(taskInstId);
        log = "Task claimed";
    }
    catch (Exception e)
    {
    e.printStackTrace();
    System.err.println(e);
    log = "Task in Exception "+e.getLocalizedMessage();
    }
    return log;
    }
  @Path("/release/{task-id}")
  @POST
  @Consumes({MediaType.APPLICATION_JSON})
  @Produces({MediaType.APPLICATION_JSON})
  public String release(@PathParam("task-id") String taskInstanceId) throws Exception
    {
    String log = null;
    try{
    //Retrieve the TaskInstanceManager
    TaskInstanceManager taskInstanceManager = BPMFactory.getTaskInstanceManager();
    taskInstanceId = PRE_TASK_URI + taskInstanceId;
    URI taskInstId = new URI(taskInstanceId);
    taskInstanceManager.release(taskInstId);
        log = "Task released";
    }
    catch (Exception e)
    {
    e.printStackTrace();
    System.err.println(e);
    log = "Task in Exception "+e.getLocalizedMessage();
    }
    return log;
    }
  @Path("/nominate/{task-id}")
  @POST
  @Consumes({MediaType.APPLICATION_JSON})
  @Produces({MediaType.APPLICATION_JSON})
  public String nominate(@PathParam("task-id") String taskInstanceId, IUser newOwner) throws Exception
    {
    String log = null;
    try{
    //Retrieve the TaskInstanceManager
    TaskInstanceManager taskInstanceManager = BPMFactory.getTaskInstanceManager();
    taskInstanceId = PRE_TASK_URI + taskInstanceId;
    URI taskInstId = new URI(taskInstanceId);
    //Claim the Task First
    taskInstanceManager.claim(taskInstId);
    taskInstanceManager.nominate(taskInstId, newOwner);
        log = "Task delegated";
    }
    catch (Exception e)
    {
    e.printStackTrace();
    System.err.println(e);
    log = "Task in Exception "+e.getLocalizedMessage();
    }
    return log;
    }
}



Step 6 & Step 7 is same as mentioned in the document. If you are continuing then you can ignore these steps.


Creating Deploy-able Object & Accessing the methods exposed.


Refer the document to “Creating Deploy-able Object” & “Accessing the methods exposed” as it is the same.


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