I require a Human Task allowing a null, updatable, payload parameter

Hello, I hope to get help here for I have been stuck for a while.
I am developing a BPEL process for employee Onboarding. Several of the Human Task forms contain parameters, like Address2, MIDDLE_NAME, etc, which it is perfectly all right for the parameter to have no value. For my exerts below I will use the MIDDLE_NAME parameter.
Below is my error message, the assign which is throwing the error, the schema definition DetermineLocation_ht_payload.xsd, and the task definition file DetermineLocation_ht.task
I have tried various permutations and locations of MinOccurs and nillable. I find it hard to believe that this is such an abnormal requirement, to allow a null element in a Human Task. I am obviously missing something fundemental.
TheseTask Forms should present data to a user, and allow them to edit the updatable data and Approve. Even the non-updatable elements throw the error if null. Everything else in my process works fine: if I use a single character like a "~" or something when initiating from BPEL Console, all works fine. I hate to use a '~' or something for a "filler", seems so bogus.
Can someone please help me? I would appreciate it greatly. Thank you in advance.
Richard
ERROR MESSAGE
[2009/04/03 14:27:16] Error in evaluate <from> expression at line "1212". The result is empty for the XPath expression : "/task:task/task:payload/task:EMPLOYEE_MIDDLE".less
oracle.xml.parser.v2.XMLElement@12cb5f1
[2009/04/03 14:27:16] "{http://schemas.xmlsoap.org/ws/2003/03/business-process/}selectionFailure" has been thrown.less
-<selectionFailure xmlns="http://schemas.xmlsoap.org/ws/2003/03/business-process/">
-<part name="summary">
<summary>
empty variable/expression result.
xpath variable/expression expression "/task:task/task:payload/task:EMPLOYEE_MIDDLE" is empty at line 1212, when attempting reading/copying it.
Please make sure the variable/expression result "/task:task/task:payload/task:EMPLOYEE_MIDDLE" is not empty.
</summary>
</part>
</selectionFailure
ASSIGN CODE
<copy>
<from variable="DetermineLocation_ht_1_globalVariable"
part="payload"
query="/task:task/task:payload/task:EMPLOYEE_MIDDLE"/>
<to variable="ReceiveRead_iv" part="Root-Element"
query="/ns2:Root-Element/ns2:Emp/ns2:EmpMiddle"/>
</copy>
DetermineLocation_ht_payload.xsd
<?xml version = '1.0' encoding = 'UTF-8'?>
<schema targetNamespace="http://xmlns.oracle.com/bpel/workflow/task" xmlns:tns="http://xmlns.oracle.com/bpel/workflow/task" attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns="http://www.w3.org/2001/XMLSchema" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<complexType name="payloadType">
<sequence>
<element name="RECRUITER" type="xsd:string"/>
<element name="RECRUITER_FIRST" type="xsd:string"/>
<element name="RECRUITER_LAST" type="xsd:string"/>
<element name="SPACE_ADMIN" type="xsd:string"/>
<element name="EMPLOYEE_NO" type="xsd:string"/>
<element name="EMPLOYEE_FIRST" type="xsd:string"/>
<element name="EMPLOYEE_MIDDLE" type="xsd:string"/>
<element name="EMPLOYEE_LAST" type="xsd:string"/>
<element name="START_DATE" type="xsd:string"/>
<element name="GENDER" type="xsd:string"/>
<element name="SL_OFFICE" type="xsd:string"/>
<element name="ASSIGNMENT" type="xsd:string"/>
<element name="PROJECT_MANAGER" type="xsd:string"/>
<element name="COMPANY" type="xsd:string"/>
<element name="BUSINESS_GROUP" type="xsd:string"/>
<element name="WORKGROUP" type="xsd:string"/>
<element name="SUPERVISOR" type="xsd:string"/>
<element name="LOCATION" type="xsd:string"/>
</sequence>
</complexType>
<element name="payload" type="tns:payloadType"/>
</schema>
DetermineLocation_ht.task
<?xml version = '1.0' encoding = 'UTF-8'?>
<taskDefinition targetNamespace="http://xmlns.oracle.com/DetermineLocation_ht" xmlns:xp20="http://www.oracle.com/XSL/Transform/java/oracle.tip.pc.services.functions.Xpath20" xmlns:ora="http://schemas.oracle.com/xpath/extension" xmlns:orcl="http://www.oracle.com/XSL/Transform/java/oracle.tip.pc.services.functions.ExtFunc" xmlns:task="http://xmlns.oracle.com/bpel/workflow/task" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://xmlns.oracle.com/bpel/workflow/taskDefinition"
xmlns:xref="http://www.oracle.com/XSL/Transform/java/oracle.tip.xref.xpath.XRefXPathFunctions"
xmlns:bpws="http://schemas.xmlsoap.org/ws/2003/03/business-process/"
xmlns:ehdr="http://www.oracle.com/XSL/Transform/java/oracle.tip.esb.server.headers.ESBHeaderFunctions"
xmlns:ids="http://xmlns.oracle.com/bpel/services/IdentityService/xpath"
xmlns:hwf="http://xmlns.oracle.com/bpel/workflow/xpath">
<name>DetermineLocation_ht</name>
<id>${domain_id}_${process_id}_${process_revision}_DetermineLocation_ht</id>
<title>Determine Location</title>
<priority>3</priority>
<process processId="" processVersion=""/>
<routingSlip xmlns="http://xmlns.oracle.com/bpel/workflow/routingSlip">
<globalConfiguration>
<owner>bpeladmin</owner>
</globalConfiguration>
<participants isAdhocRoutingSupported="false">
<participant name="Assignee1"
skipCondition="string-length(/task:task/task:payload/task:LOCATION) > 1">
<resource isGroup="false" type="XPATH">/task:task/task:payload/task:SPACE_ADMIN</resource>
</participant>
</participants>
<onErrorParticipant>
<resource isGroup="true" type="STATIC">FINALAPPROVERS</resource>
<resource isGroup="true" type="STATIC">oc4j-administrators</resource>
</onErrorParticipant>
<notification includeTaskAttachments="false" actionable="false"
secureNotifications="false">
<reminder relativeDate="ASSIGNED" reminderDuration="P1DT"
recurrence="2"/>
<action name="ASSIGN" recipient="ASSIGNEES"><![CDATA[concat(string('<table width="100%">
<TR BGCOLOR=#ededed HEIGHT="100">
<td>Attention,<br><br>'), /task:task/task:payload/task:EMPLOYEE, string(' has been assigned to '), /task:task/task:payload/task:ASSIGNMENT, string('. Please click on the link below to enter the location for this new employee.<br><br><br>
Sincerely,<br><br>
The BPEL Onboarding Business Process</td></tr></table>'))]]></action>
<action name="COMPLETE" recipient="CREATOR"><![CDATA[concat(string('Task '), /task:task/task:title, string(' requires your attention. Please access the task from the worklist application.'))]]></action>
<action name="ERROR" recipient="OWNER"><![CDATA[concat(string('Task '), /task:task/task:title, string(' requires your attention. Please access the task from the worklist application.'))]]></action>
</notification>
</routingSlip>
<workflowConfiguration xmlns="http://xmlns.oracle.com/bpel/workflow/configuration"
xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<outcomes>
<outcome>APPROVE</outcome>
</outcomes>
<restrictedActions/>
<payload xmlSchemaDefinition="DetermineLocation_ht_payload.xsd">
<messageAttribute name="RECRUITER" attributeType="SIMPLE_TYPE"
type="xsd:string" updatable="false"/>
<messageAttribute name="RECRUITER_FIRST" attributeType="SIMPLE_TYPE"
type="xsd:string" updatable="false"/>
<messageAttribute name="RECRUITER_LAST" attributeType="SIMPLE_TYPE"
type="xsd:string" updatable="false"/>
<messageAttribute name="SPACE_ADMIN" attributeType="SIMPLE_TYPE"
type="xsd:string" updatable="false"/>
<messageAttribute name="EMPLOYEE_NO" attributeType="SIMPLE_TYPE"
type="xsd:string" updatable="false"/>
<messageAttribute name="EMPLOYEE_FIRST" attributeType="SIMPLE_TYPE"
type="xsd:string" updatable="false"/>
<messageAttribute name="EMPLOYEE_MIDDLE" attributeType="SIMPLE_TYPE"
type="xsd:string" updatable="false"/>
<messageAttribute name="EMPLOYEE_LAST" attributeType="SIMPLE_TYPE"
type="xsd:string" updatable="false"/>
<messageAttribute name="START_DATE" attributeType="SIMPLE_TYPE"
type="xsd:string" updatable="false"/>
<messageAttribute name="GENDER" attributeType="SIMPLE_TYPE"
type="xsd:string" updatable="false"/>
<messageAttribute name="SL_OFFICE" attributeType="SIMPLE_TYPE"
type="xsd:string" updatable="false"/>
<messageAttribute name="ASSIGNMENT" attributeType="SIMPLE_TYPE"
type="xsd:string" updatable="false"/>
<messageAttribute name="PROJECT_MANAGER" attributeType="SIMPLE_TYPE"
type="xsd:string" updatable="false"/>
<messageAttribute name="COMPANY" attributeType="SIMPLE_TYPE"
type="xsd:string" updatable="false"/>
<messageAttribute name="BUSINESS_GROUP" attributeType="SIMPLE_TYPE"
type="xsd:string" updatable="false"/>
<messageAttribute name="WORKGROUP" attributeType="SIMPLE_TYPE"
type="xsd:string" updatable="false"/>
<messageAttribute name="SUPERVISOR" attributeType="SIMPLE_TYPE"
type="xsd:string" updatable="false"/>
<messageAttribute name="LOCATION" attributeType="SIMPLE_TYPE"
type="xsd:string" updatable="true"/>
</payload>
<bpelEventListener>false</bpelEventListener>
</workflowConfiguration>
</taskDefinition>
Edited by: rsuchoza on Apr 3, 2009 2:58 PM

Hi
Try to make the <messageAttribute name="ASSIGNMENT" attributeType="SIMPLE_TYPE"
type="xsd:string" updatable="false"/>
to
<messageAttribute name="ASSIGNMENT" attributeType="SIMPLE_TYPE"
type="xsd:string" updatable="true"/>

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Language
Claim type (for example in insurance)
Applicant posts the claim and the insurance case is assessed by insurance handler. When the process flow comes to a human task it passes the claim's language and type of the claim to the human task manager. The human task manager would then determine who should handle this task. Let's say that Mike speaks spanish and has skills in car insurance claims. The human task manager would be responsible for determening that this task belongs to Mike (in case that the claim was in spanish and it was car insurance claim).
Is there any patterns or examples how this should be handled. I know this quite like case management but I think modern BPM's should be able to handle case management.
Thank you
Best Regards Tuomas Katva

Bpel human task custom jsp not run

hi i am use bpel 10.1.3.1 and oas 10.1.3 made a simple bpel process with a human task but the custom jsp generated not run from the url , and i recieve that message
"Servlet error: An exception occurred. The current application deployment descriptors do not allow for including it in this response"

The issue was with the way I was passing parameters. I was passing the the task namespace in update mode which is not required.

Jdev human task addition error

Hi All,
I am trying to add a human task in a default project created in OIM. While I have defined a new task definition and all required task parameters, a null pointer exception is encountered when the task is attempted to be saved. I looked for similar issue on the forum and found few others have faced same problem but no solution has been recommended so far. Apologies I if overlooked any solution given already.
Uncaught exception
java.lang.NullPointerException
o.tip.tools.ide.bpel.v1.plugins.plugins.oracleext.graph.editors.workflow.GeneralTaskIOHandler.modifySwitchNode(GeneralTaskIOHandler.java:1090)
o.tip.tools.ide.bpel.v1.plugins.plugins.oracleext.graph.editors.workflow.GeneralTaskIOHandler.saveChanges(GeneralTaskIOHandler.java:400)
o.tip.tools.ide.bpel.v1.plugins.plugins.oracleext.graph.editors.workflow.NewWorkflowComponent.saveChanges(NewWorkflowComponent.java:369)
o.tip.tools.ide.bpel.v1.plugins.plugins.oracleext.graph.editors.workflow.GeneralTaskEditPage.saveChanges(GeneralTaskEditPage.java:98)
o.tip.tools.ide.bpel.v1.designer.graph.nodeeditors.framework.AbstractActivityNodeEditor$PanelManager.saveChanges(AbstractActivityNodeEditor.java:203)
o.tip.tools.ide.bpel.v1.plugins.plugins.oracleext.graph.nodeeditors.workflow.UserTaskPanelManager.saveChanges(UserTaskPanelManager.java:66)
o.tip.tools.ide.bpel.v1.designer.graph.nodeeditors.framework.ApplyCancelPanel.handleOK(ApplyCancelPanel.java:164)
o.tip.tools.ide.bpel.v1.designer.graph.nodeeditors.framework.ApplyCancelPanel.actionPerformed(ApplyCancelPanel.java:204)
jx.s.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
jx.s.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
jx.s.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
jx.s.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
jx.s.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
j.a.Component.processMouseEvent(Component.java:6289)
jx.s.JComponent.processMouseEvent(JComponent.java:3267)
j.a.Component.processEvent(Component.java:6054)
j.a.Container.processEvent(Container.java:2041)
j.a.Component.dispatchEventImpl(Component.java:4652)
j.a.Container.dispatchEventImpl(Container.java:2099)
j.a.Component.dispatchEvent(Component.java:4482)
j.a.LightweightDispatcher.retargetMouseEvent(Container.java:4577)
j.a.LightweightDispatcher.processMouseEvent(Container.java:4238)
j.a.LightweightDispatcher.dispatchEvent(Container.java:4168)
j.a.Container.dispatchEventImpl(Container.java:2085)
j.a.Window.dispatchEventImpl(Window.java:2478)
j.a.Component.dispatchEvent(Component.java:4482)
j.a.EventQueue.dispatchEventImpl(EventQueue.java:644)
j.a.EventQueue.access$000(EventQueue.java:85)
j.a.EventQueue$1.run(EventQueue.java:603)
j.a.EventQueue$1.run(EventQueue.java:601)
j.security.AccessController.doPrivileged(Native Method)
j.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
j.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)
j.a.EventQueue$2.run(EventQueue.java:617)
j.a.EventQueue$2.run(EventQueue.java:615)
j.security.AccessController.doPrivileged(Native Method)
j.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
j.a.EventQueue.dispatchEvent(EventQueue.java:614)
j.a.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
j.a.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
j.a.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
j.a.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
j.a.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
j.a.EventDispatchThread.run(EventDispatchThread.java:122)
Appreciate your help!
Thanks.

Thanks Ravi for your response.
I observed something strange today! I was adding the human task, I talked about yesterday, in switch condition on 'Approve' response. But when I added the same human task outside switch condition, it worked just fine. Is placing a human task in switch condition not a supported configuration?
Use case: There are two levels of approver. Both the approver have different escalation critieria. In case of level 1 approver (beneficiary's manager), the task is required to be escalated to manager's manager. But in case of approver 2, no escalation is required.
Since escalation is defined at global level in a task, I decided to create two human tasks and insert second one on 'Approve' response of first task.
The second option that I am considering is - implement IDynamicTaskEscalationFunction interface to write a custom escalation java class and use it within same human task to skip escalations in case of approver 2 (not sure if this is possible, as I haven't implemented it before).

Custom bean on Approve in Human Task Form

Hi,
I have a complex requirement, The Approver has to validate the employee number manually.Approver will look in some system.
There is a check box in Human Task Form " Validated Employee Number".
The approver has to check mark this check box before approve. If this check box is not checked, we have to stop them with a pop up " Please verify employee number"
Please advise.
Thanks in advance.

for the approve button, add action listener method and check your reqired fileds if any required filed is not entered you can throw an error as below.
FacesContext.getCurrentInstance().addMessage(null,
                                                                       new FacesMessage(FacesMessage.SEVERITY_ERROR,
                                                                       "Your Error Message",
                                                                        null));

I require a Human Task allowing a null, updatable, payload parameter

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