Any Document related to implementation of Human tasks in BPEL

Hi Friends,
I am new to BPEL and looking for a reference document to implement the Human Tasks in BPEL.
My Email ID: [email protected]
regards
Sai

You will find lots of document in the
<OC4J_HOME>\OracleAS_1\bpel\samples\demos\
folder.
There is a good tutorial name VacationRequest which you can refer for getting a knowledge of Human workflow.

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Send email through human task in bpel

hi everybody,
I am badly stuck in sending email through human task using bpel.
I have used reminder facility and enabled send email in .task file.but no email
is sent so anyone please help me out and please provide me with full detailed solution what I have to do like change any xml file setting etc.
Also I was trying to send email using email activity by changing the ns_emails.xml in .........bpel/systems/services/config & in .......integration/esb/config but I was not succeeded. So please provide me with complete solution like what parameters to pass in smtp server,port no,protocols etc and which file to change in which directory. my work is pending just because of this.
I would be very grateful to you.
thanks in advance.
mansoor.

Hi mansoor,
<EmailAccounts xmlns="http://xmlns.oracle.com/ias/pcbpel/NotificationService"
EmailMimeCharset=""
NotificationMode="EMAIL">
     <EmailAccount>
          <Name>Default</Name>
          <GeneralSettings>
               <FromName>BPEL POC</FromName>
               <FromAddress></FromAddress>
          </GeneralSettings>
          <OutgoingServerSettings>
               <SMTPHost>mail.oracle.com</SMTPHost>
               <SMTPPort>25</SMTPPort>
          </OutgoingServerSettings>
          <IncomingServerSettings>
               <Server>mail.oracle.com</Server>
               <Port>993</Port>
               <Protocol>IMAP</Protocol>
               <UserName>xxxxxx</UserName>
               <Password ns0:encrypted="false" xmlns:ns0="http://xmlns.oracle.com/ias/pcbpel/NotificationService"></Password>
               <UseSSL>false</UseSSL>
               <Folder>Inbox</Folder>
               <PollingFrequency>1</PollingFrequency>
               <PostReadOperation>
               <MarkAsRead/>
               </PostReadOperation>
          </IncomingServerSettings>
     </EmailAccount>

Human Tasks in BPEL

I have a workflow that needs to include a human review point for quality control purposes.
I have added a "Human Task" at that point, and that seems to partially work. I can see the tasks in BPM and I can Approve the task. What's not working is that after the approval, the next step in the BPEL flow isn't getting applied.
Perhaps related is that I can see the human task was executed from within the SOA Console. However, I don't see the BPEL instance that it was associated with. I only seem to be able to see instances that have completed.
So, I'd appreciate any help you can provide on what I might be doing wrong or how to best diagnose what's going on.

dmvers,
Probably best for you to try the BPEL forum (or if you're using the 11g TP), the SOA Suite 11g TP forum.
Best,
john

Add a Human Task in BPEL but it shows as an Auto Task in BPA

Hi, all,
I create a BPMN flow in BPA and mapping to BPEL. And I add a Human Task in jDeveloper, and saved back to BPA server. But the problem is the updated BPMN flow shows that I added a Auto Task in BPA. Could you help me on that? Thanks in advance.
Best Regards,
Bill

Hi Bill,
Prefatory a quick intro on the basic idea of the BPA concept and a few personal recommendations. In general all changes on the control flow should be initiated top-down from the business process, which means your requirement becomes relevant only in certain cases. If the refinement of the BPEL process is going beyond the technical implementation, then the BPMN diagram itself needs to be corrected. That being said, in certain cases it may be sensible to make use of the improvement proposal feature (e.g. the IT developer recognizes the need of an additional service invocation, so that the control flow of the business process has to be refined).
Referring to your issue these changes are displayed as Automated Activities (abstract) in the superior business process (in BPA). For this reason some activities require a different approach when it comes to accepting or rejecting by the business users. The description below provides an overview about how-to add activities in BPEL subsequently (as improvement proposals) and how they will be represented in the superior business process after synchronization (personal recommendations).
Control flow
Email, Fax, Pager, Pager, SMS, Voice+
BPEL process (JDeveloper)+
Encapsulate within a separate Abstract activity - choose a name, which helps to identify that this should be a Notification activity (define naming conventions in the conventions handbook).
Business process (BP Architect)+
By default represented as Automated Activity (abstract).
Open the improvement proposal model and select the new activity. Go to Format/Representation and select 'Notification' in the Symbol-dropdown list - the object appearance changes.
Important: double-click the new activity and specify all the required parameters. Share the blueprint with IT.
Note: The attributes of the abstract Automated Activity still appear in the attributes view.
Invoke+
BPEL process (JDeveloper)+
Encapsulate within Abstract activities.
Business process (BP Architect)+
If encapsulated within an existing scope in BPEL - not visible in the superior process.
If encapsulated within an Abstract activity in BPEL - represented as Automated Activity (abstract).
Human Task+
BPEL process (JDeveloper)+
Encapsulate with an a separate Abstract activity - choose a name, which helps to identify that this should be a Human Task activity (define naming conventions in the conventions handbook). Ignore the Switch activity that will be added below the Human Task.
Business process (BP Architect)+
By default represented as Automated Activity (abstract).
Open the improvement proposal model and select the new activity. Go to Format/Representation and select 'Human Task' in the Symbol-dropdown list - the object appearance changes.
Important: double-click the new activity and specify all the required parameters. Share the blueprint with IT.
Note: The attributes of the abstract Automated Activity still appear in the attributes view.
Receive, Reply+
BPEL process (JDeveloper)+
Encapsulate within Abstract activities.
Business process (BP Architect)+
If encapsulated within an existing scope in BPEL - not visible in the superior process.
If encapsulated within an Abstract activity in BPEL - represented as Automated Activity (abstract).
Decide+
BPEL process (JDeveloper)+
Add a new Abstract scope - choose a name, which helps to identify that this should be a Business Rule activity (define naming conventions in the conventions handbook). Place an Empty activity inside the scope.
Business process (BP Architect)+
By default represented as Automated Activity (abstract).
Open the improvement proposal model and select the new activity. Go to Format/Representation and select 'Business rule function' in the Symbol-dropdown list - the object appearance does change.
Important: double-click the new activity and specify all the required parameters. Share the blueprint with IT.
Note: The attributes of the abstract Automated Activity still appear in the attributes view.
Flow, Switch, Pick+
BPEL process (JDeveloper)+
Only new branches within existing activities can be added subsequently. Each branch should contain at least one Abstract activity.
Business process (BP Architect)+
New activities should be defined in the superior business process.
Displayed as gateways (AND, XOR <event-based>, XOR <data-type>, OR) - the definition of these activities should be initiated in the business process.
While+
BPEL process (JDeveloper)+
Only within existing scopes. Loops should be defined in the superior business process.
Business process (BP Architect)+
If not encapsulated within a scope in BPEL - will be represented as Automated Activity (abstract).
If encapsulated within an existing scope in BPEL - not visible in the superior process after synchronization.
If encapsulated within an Abstract in BPEL - will be represented as Automated Activity (abstract).
Implementation
Assign, Transform, Throw+
BPEL process (JDeveloper)+
Only within existing scopes.
Business process (BP Architect)+
Not visible.
Wait, Terminate+
BPEL process (JDeveloper)+
Not recommended to add them subsequently - should be defined in the superior business process via Intermediate events (BPMN).
Business process (BP Architect)+
Displayed as intermediate event - the definition of these activities should be initiated in the business process.
Kind regards,
Danilo

How to map payload from Human Task to BPEL

Hi,
I have created a human task form for which I send two parameters from the BPEL process.
The user is able to update the fields containing the sent parameters and then click 'APPROVE' or 'REJECT'. However, I need the values of the updated fields to be returned and not the 'APPROVE' or 'REJECT strings.
Can anybody help me with this?
Alex

Hi Alex,
If you checked the Editable via worklistapp box then you dont need to update the values.
These values automatically update the values of these parameters in human task if you properly mapped the values.
Regards,
Priyanka

Problem in Human Task in BPEL

I have a BPEL process with eight human task.Ater the last human task in the switch block i have added one assign activity and one mail activity in the "APPROVED" case. I have deployed the process and ran it. The flow got stuck in the last human task receive call back step and not proceeding to next switch, but i have already approved the task from worklist.
I have added oned one BAM sensor in that receive step and the sensor was set on "completion". BAM has received the data that ""receive completed".so it seems like that the receive actiivity gets completed but not showing in the BPEL visual flow also not proceeding further.
After that I removed the assign activity and mail activity and tested it once..it worked fine..
It looks strange to me....

There's probably a problem within your assign activity. Check the domain log as Eric suggested. You can find it @:
$ORACLE_HOME/bpel/domains/<your_domain>/logs/domain.log
HTH,
Bas

Human Task in BPEL

Hi,
I have a question on Human Task component in BPEL. How do we configure the identity store for users . I mean i did exported some users onto my local machine following the link in the documentation. But how to work on the Human Task at the client side ? How to add the users ? Please help me in this regard.
Thanks,
N

There's probably a problem within your assign activity. Check the domain log as Eric suggested. You can find it @:
$ORACLE_HOME/bpel/domains/<your_domain>/logs/domain.log
HTH,
Bas

Error updating a Human Task in BPEL

Hi,
I have a requirement where in i need bpeladmin to update a task assigned to some group.
While doing so ,as task is assigned to group i first acquire the task and then perform update on the task
While performing updation i am getting following
Invalid action on workflow task.
Action UPDATE on task a7a61c38dd54a6cb:d9506a8:121a07d45ee:-7aa7 is not valid because of .
Contact oracle support if error is not fixable.
at oracle.bpel.services.workflow.task.impl.TaskService.performPreActionValidation(TaskService.java:3416)
at oracle.bpel.services.workflow.task.impl.TaskService.performPreActionValidation(TaskService.java:3440)
at oracle.bpel.services.workflow.task.impl.TaskService.addComment(TaskService.java:617)
at oracle.bpel.services.workflow.task.impl.TaskService.addComment(TaskService.java:639)
at oracle.bpel.services.workflow.task.ejb.TaskServiceBean.addComment(TaskServiceBean.java:167)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.evermind.server.ejb.interceptor.joinpoint.EJBJoinPointImpl.invoke(EJBJoinPointImpl.java:35)
at com.evermind.server.ejb.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:119)
at com.evermind.server.ejb.interceptor.system.DMSInterceptor.invoke(DMSInterceptor.java:52)
at com.evermind.server.ejb.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:119)
at com.evermind.server.ejb.interceptor.system.JAASInterceptor$1.run(JAASInterceptor.java:31)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at com.evermind.server.ThreadState.runAs(ThreadState.java:622)
at com.evermind.server.ejb.interceptor.system.JAASInterceptor.invoke(JAASInterceptor.java:34)
at com.evermind.server.ejb.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:119)
at com.evermind.server.ejb.interceptor.system.TxRequiresNewInterceptor.invoke(TxRequiresNewInterceptor.java:52)
at com.evermind.server.ejb.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:119)
at com.evermind.server.ejb.interceptor.system.DMSInterceptor.invoke(DMSInterceptor.java:52)
at com.evermind.server.ejb.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:119)
at com.evermind.server.ejb.InvocationContextPool.invoke(InvocationContextPool.java:55)
at com.evermind.server.ejb.StatelessSessionEJBObject.OC4J_invokeMethod(StatelessSessionEJBObject.java:87)
at TaskServiceBean_RemoteProxy_68d4144.addComment(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.evermind.server.rmi.RmiMethodCall.run(RmiMethodCall.java:53)
at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:303)
at java.lang.Thread.run(Thread.java:595)
Caused by: ORABPEL-30036
Invalid action on workflow task.
Action UPDATE on task a7a61c38dd54a6cb:d9506a8:121a07d45ee:-7aa7 is not valid because of The task has been acquired by some other user..
Contact oracle support if error is not fixable.
at oracle.bpel.services.workflow.task.impl.TaskService.performPreActionValidation(TaskService.java:3408)
... 32 more
exception is ORABPEL-30036
Invalid action on workflow task.
Action UPDATE on task a7a61c38dd54a6cb:d9506a8:121a07d45ee:-7aa7 is not valid because of .
Contact oracle support if error is not fixable.
When i check wftask table in database , acquiredby column it shows entry as bpeladmin
Following is the code snippet that i am using to perform the task
Task objTask=wfSvcClient.getTaskService().acquireTask(wfCtx,"a7a61c38dd54a6cb:d9506a8:121a07d45ee:-7aa7");
     objTask=wfSvcClient.getTaskService().addComment(wfCtx, "a7a61c38dd54a6cb:d9506a8:121a07d45ee:-7aa7", "abc123");
     List assigneeGroupLst=objTask.getSystemAttributes().getAssigneeGroups();
     String assigneeGroup=null;
     if(null!=assigneeGroupLst && assigneeGroupLst.size()>0){
          assigneeGroup=((IdentityType)assigneeGroupLst.get(0)).getId();
     SystemMessageAttributesType sysAttr=objTask.getSystemMessageAttributes();
     sysAttr.setProtectedTextAttribute1(assigneeGroup);
     wfSvcClient.getTaskService().updateTask(wfCtx, objTask);
The context created is for user BPELAdmin user.
Do i need to give any rights to bpeladmin? Or is there some other way of doing it.
Any help appreciated !!!
Regards,
Bhavik

Hi Anirudh,
Thanks for quick reply.
I have a requirement where based on certain condition i need to update the task and reassign it.
There is a batch that runs and performs the task. While doing so i dont have any info as to whom
the task is assigned.
So i am using bpeladmin to perform the task.
If task is assigned to user and i try to update the task using bpeladmin then am able to do so.
But if the task is assigned to Group i am getting the error. If task is assigned to user, i am able to
acquire the task but not able to update the task.
While updation it shows the task has been acquired by some other user.
Is there any other way by which i can implement the same ?
Regards,
Bhavik

How to specify stylesheet for attachments in Human task

Dear Experts,
I can able to add an attachment from BPEL process to Human Task. So from Worklist I can able to download the attachment. Here, I am attaching an XML payload, and I am receiving .xml file from worklist. Now I want to do xsl mapping with my attachment. To do that we have an option when creating Human Task from BPEL . In .task form, under advanced settings--> specify style sheets for attachments, specify wordML for attchments. I have used those options. But not yet my .xsl file mapped with .xml. Is there is any other way to do xsl mapping. Please suggest me.
Thanks,
Rajesh

Hi Anirudh,
I am using SOA Server suite 10.1.3.1 and JDeveloper 10g. Also I am not using "Application Server Developer's Guide for Microsoft Office Interoperability" this document, what you have mentioned in your last post. My problem is I am having xsl with me, need to map this xsl to my xml attachment. To do that we are having an option on .task form editor, Under Advanced Settings. We can mention/specify stylesheet for attachment, or we can specify wordML for attachment. I have tried both but I cant able to do xsl transformation. I have seen some code in this link. But I dont know whether this blog is correct one. Please suggest me.
Thanks,
Rajesh

Call web service from human task

Hi All,
I have a requirement to call webservice inside human task flow. I have three participant in my human task flow. Let suppose A, B and C. When A approves then task will be assigned to B and when B approves it will go for C.
My requirement is that, when A approves , then i need to call one external webservice to update database. I did not get any option to call webservice inside human task flow.
Please help.
Regards,
Sunil

Thanks userN for your wonderful reply but i have one more question.
As per your instructions i have enabled call back events in Human task flow. In this way i got while loop inside my BPEL. In onTaskAssigned operation i am now trying to call external web service. My requriment is to call external service and get data from service. After getting response from the webservice, i want to assign it to next participant.
But in this case, when user B approves, it goes to onTaskAssigned block and i am able to make external web service also but mean time, it has been assigned to User C which i do not want.
I want Human task flow to wait for the webservice response then only assign it to next participant.
Please help, is there any option to do it.
Regards,
Sunil

Strange human task error in BPEL process

When we call a human task in BPEL process we are facing following error .
We can't reach any information about that?
is there any one face before?
Thanks.
Exception Trace:
javax.servlet.ServletException: Cannot find work items.
An attempt to fetch the work items using the where condition
"cikey = ? and ( node_id like 'BpInv%' or node_id like 'BpRcv%' or node_id like 'BpOMs%')" from the datastore has failed.
The exception reported is: Invalid column name Please check that the machine hosting the datasource
is physically connected to the network. Otherwise, check that the
datasource connection parameters (user/password) is currently valid. sql statement:
SELECT * FROM admin_list_wi
WHERE ci_domain_ref = 0 AND cikey = ? and ( node_id like 'BpInv%' or node_id like 'BpRcv%' or node_id like 'BpOMs%') ORDER BY wi_creation_date at com.evermind.server.http.EvermindPageContext.handlePageThrowable(EvermindPageContext.java:866) at com.evermind.server.http.EvermindPageContext.handlePageException(EvermindPageContext.java:813) at ngWSActivityList.jspService(_ngWSActivityList.java:291) at com.orionserver.http.OrionHttpJspPage.service(OrionHttpJspPage.java:59) at oracle.jsp.runtimev2.JspPageTable.service(JspPageTable.java:462) at oracle.jsp.runtimev2.JspServlet.internalService(JspServlet.java:594) at oracle.jsp.runtimev2.JspServlet.service(JspServlet.java:518) at javax.servlet.http.HttpServlet.service(HttpServlet.java:856) at com.evermind.server.http.ResourceFilterChain.doFilter(ResourceFilterChain.java:65) at oracle.security.jazn.oc4j.JAZNFilter$1.run(JAZNFilter.java:396) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAsPrivileged(Subject.java:517) at oracle.security.jazn.oc4j.JAZNFilter.doFilter(JAZNFilter.java:410) at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:623) at com.evermind.server.http.ServletRequestDispatcher.unprivileged_include(ServletRequestDispatcher.java:160) at com.evermind.server.http.ServletRequestDispatcher.access$000(ServletRequestDispatcher.java:51) at com.evermind.server.http.ServletRequestDispatcher$1.oc4jRun(ServletRequestDispatcher.java:97) at oracle.oc4j.security.OC4JSecurity.doPrivileged(OC4JSecurity.java:283) at com.evermind.server.http.ServletRequestDispatcher.include(ServletRequestDispatcher.java:102) at com.evermind.server.http.EvermindPageContext.include(EvermindPageContext.java:453) at displayInstance.jspService(_displayInstance.java:676) at com.orionserver.http.OrionHttpJspPage.service(OrionHttpJspPage.java:59) at oracle.jsp.runtimev2.JspPageTable.service(JspPageTable.java:462) at oracle.jsp.runtimev2.JspServlet.internalService(JspServlet.java:594) at oracle.jsp.runtimev2.JspServlet.service(JspServlet.java:518) at javax.servlet.http.HttpServlet.service(HttpServlet.java:856) at com.evermind.server.http.ResourceFilterChain.doFilter(ResourceFilterChain.java:65) at oracle.security.jazn.oc4j.JAZNFilter$1.run(JAZNFilter.java:396) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAsPrivileged(Subject.java:517) at oracle.security.jazn.oc4j.JAZNFilter.doFilter(JAZNFilter.java:410) at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:623) at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:370) at com.evermind.server.http.ServletRequestDispatcher.unprivileged_forward(ServletRequestDispatcher.java:259) at com.evermind.server.http.ServletRequestDispatcher.access$100(ServletRequestDispatcher.java:51) at com.evermind.server.http.ServletRequestDispatcher$2.oc4jRun(ServletRequestDispatcher.java:193) at oracle.oc4j.security.OC4JSecurity.doPrivileged(OC4JSecurity.java:283) at com.evermind.server.http.ServletRequestDispatcher.forward(ServletRequestDispatcher.java:198) at com.collaxa.cube.fe.DomainFilter.doFilter(DomainFilter.java:131) at com.evermind.server.http.EvermindFilterChain.doFilter(EvermindFilterChain.java:15) at oracle.security.jazn.oc4j.JAZNFilter$1.run(JAZNFilter.java:396) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAsPrivileged(Subject.java:517) at oracle.security.jazn.oc4j.JAZNFilter.doFilter(JAZNFilter.java:410) at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:621) at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:370) at com.evermind.server.http.HttpRequestHandler.doProcessRequest(HttpRequestHandler.java:871) at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:453) at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:302) at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:190) at oracle.oc4j.network.ServerSocketReadHandler$SafeRunnable.run(ServerSocketReadHandler.java:260) at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:303) at java.lang.Thread.run(Thread.java:595)

Have you patched BPEL with any of the MLR releases? Some of the patches contain DB scripts that must be run separately from the patch install.

Designing Sequence of Human Task

Hii All,
I want to design a BPEL work flow for for LOAN approval process where user submits application and if system checks for all required fields if found correct then
it goes as a task to user RM and if approves it it goes for another user AM for approval otherwise it rejects with reason stated.here two human task are involved can anyone please help me and tell the steps i should follow to design this.whether i have to make nested human task or any other process is there in human task.
thanks and regards,
Deekay

Another option is that while designing human task you can have two stages instead of one.
- Open Human Task from Composite.xml
- Expand 'Assignment and Routing Policy'
- Select 'Stage1.Participant1' that is the first stage activity
- Click on th '+' icon under Assignment and Routing
- Select Sequential Participant Block. In the popup select your second participnat/block.
- Go to advanced section of this popup, and check 'skip', Specify a skip rule for this stage. You can choose the outcome from first stage and match it with 'Reject' to skip this stage
HTH

Classes generated for Human Task UI

Hi All,
I created ADF UI out of a human task (using Automatically generate form option). After generating, I can see lot of .xml files under the HumanTaskForm package, in the newly generated project. I would like to know the way in which these classes (Java Bean) are generated under the HumanTaskForm package.
Also, when I update some values in the UI page at runtime, I am able to see the change , in the response message of the HumanTask. I would like to know, from where the binding information come from, for those UI components, so that they are able to update!
Kindly give me some good documents that would explain me regarding the bean classes generated for HumanTask.
When I searched for the same, I could get the documents regarding the configuration of Human Task only. I need information regarding the Bean classes for Human Task.
Thanks,
Sabarisri. N

Please post on the Jdeveloper and ADF Forum where you will get more help
JDeveloper and ADF

Human Task UI generation

Is there any other tool / method to create human task UI without using the "Auto -Generate" the task form from the JDeveloper. I mean it can be any tool or procedure that is outside of JDev

Hi user080811,
Thanks for the reply. I already know about ADF Task Flow based on Human Task . But I heard we can develop UIs for the task workspace without using even jdeveloper. Is that true? if possible, how it can be?

Any Document related to implementation of Human tasks in BPEL

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