ProC dequeue process waits forever after network was brought down.

Hi all,
I want you to help me on the following issue.
Unfortunately I can not post the code right now, but I will try to explain, it is simple.
The DB and the process (ProC) which dequeues the message are on different machines.
The dequeue wait time is set to 10 sec. And of course there is a loop and an exception handling after the dequeue.
Now, if I drop the network connection between DB and ProC program while the process tries to dequeue,
the process will stuck on dequeue forever.
It does not throw any errors or something else, just waits there at DBMS_AQ.dequeue call.
Do you have any ideas what it is happening?

Hi,
I am experiencing the same problem,
Are there any important settings for time out or
other things that may prevent going through a hang problem!?
please help us

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set="WorkflowTaskIdCor"/>
*</correlations>*
*</receive>*
</sequence>
</scope>
<switch name="taskSwitch">
<case condition="bpws:getVariableData('ApproveOrder_1_globalVariable', 'payload', '/task:task/task:systemAttributes/task:state') = 'COMPLETED' and bpws:getVariableData('ApproveOrder_1_globalVariable', 'payload', '/task:task/task:systemAttributes/task:outcome') = 'REJECT'">
<bpelx:annotation>
<bpelx:pattern patternName="case">Task outcome is REJECT</bpelx:pattern>
</bpelx:annotation>
<sequence>
<assign name="AssignOrderRejected">
<copy>
<from expression="string('Order rejected by manager')"/>
<to variable="paymentFault"
part="payload"
query="/client:testbpelProcessFault/client:status"/>
</copy>
</assign>
<throw name="ThrowOrderRejected"
faultName="ns9:orderRejectedFault"
faultVariable="orderRejectedFault"/>
</sequence>
</case>
<case condition="bpws:getVariableData('ApproveOrder_1_globalVariable', 'payload', '/task:task/task:systemAttributes/task:state') = 'COMPLETED' and bpws:getVariableData('ApproveOrder_1_globalVariable', 'payload', '/task:task/task:systemAttributes/task:outcome') = 'APPROVE'">
<bpelx:annotation>
<bpelx:pattern patternName="case">Task outcome is APPROVE</bpelx:pattern>
</bpelx:annotation>
<sequence>
<empty name="Empty_1"/>
</sequence>
</case>
<otherwise>
<bpelx:annotation>
<bpelx:pattern>Task is outcome is EXPIRED, STALE, WITHDRAWN or ERRORED</bpelx:pattern>
</bpelx:annotation>
<sequence>
<empty name="Empty_2"/>
</sequence>
</otherwise>
</switch>
</sequence>
</sequence>
</scope>
<scope name="CheckCreditCard">
<variables>
<variable name="InvokeCreditCardService_process_InputVariable"
messageType="ns6:CreditCardServiceRequestMessage"/>
<variable name="InvokeCreditCardService_process_OutputVariable"
messageType="ns6:CreditCardServiceResponseMessage"/>
</variables>
<sequence name="Sequence_2">
<assign name="Assign_1">
<copy>
<from variable="inputVariable" part="payload"
query="/client:testbpelProcessRequest/client:CreditCardNumber"/>
<to variable="InvokeCreditCardService_process_InputVariable"
part="payload"
query="/ns6:CreditCardServiceProcessRequest/ns6:CreditCardNumber"/>
</copy>
</assign>
<scope name="Scope_1">
<compensationHandler>
<sequence name="Sequence_7">
<empty name="Empty_3"/>
</sequence>
</compensationHandler>
<invoke name="InvokeCreditCardService"
partnerLink="CreditCardService"
portType="ns6:CreditCardService" operation="process"
inputVariable="InvokeCreditCardService_process_InputVariable"
outputVariable="InvokeCreditCardService_process_OutputVariable"/>
</scope>
<switch name="CheckCreditCardValid">
<case condition="bpws:getVariableData('InvokeCreditCardService_process_OutputVariable','payload','/ns6:CreditCardServiceProcessResponse/ns6:result') = 'false'">
<sequence name="Sequence_3">
<assign name="AssignCreditFault">
<copy>
<from expression="string('Invalid credit card number')"/>
<to variable="paymentFault" part="payload"
query="/client:testbpelProcessFault/client:status"/>
</copy>
</assign>
<throw name="ThrowCreditFault"
faultName="ns7:CreditCardNumberFault"
faultVariable="paymentFault"/>
</sequence>
</case>
</switch>
</sequence>
</scope>
<assign name="AssignInitial">
<copy>
<from expression="string('Select Manufacturer')"/>
<to variable="outputVariable" part="payload"
query="/client:testbpelProcessResponse/client:result"/>
</copy>
<copy>
<from expression="1"/>
<to variable="n"/>
</copy>
<copy>
<from expression="0.0"/>
<to variable="outputVariable" part="payload"
query="/client:testbpelProcessResponse/client:price"/>
</copy>
</assign>
<while name="While_1"
condition="bpws:getVariableData('n') <= count(bpws:getVariableData('inputVariable','payload','/client:testbpelProcessRequest/client:input'))">
<sequence name="Sequence_1">
<assign name="DoCalculation">
<copy>
<from expression="bpws:getVariableData('inputVariable','payload', concat('/client:testbpelProcessRequest/client:input[', bpws:getVariableData('n'), ']/client:quantity')) * bpws:getVariableData('inputVariable','payload',concat('/client:testbpelProcessRequest/client:input[', bpws:getVariableData('n'), ']/client:bookPrice')) + bpws:getVariableData('outputVariable','payload','/client:testbpelProcessResponse/client:price')"/>
<to variable="outputVariable" part="payload"
query="/client:testbpelProcessResponse/client:price"/>
</copy>
<copy>
<from expression="bpws:getVariableData('n') + 1"/>
<to variable="n"/>
</copy>
</assign>
</sequence>
</while>
<assign name="Transform_2">
<bpelx:annotation>
<bpelx:pattern>transformation</bpelx:pattern>
</bpelx:annotation>
<copy>
<from expression="ora:processXSLT('TransformOrder.xsl',bpws:getVariableData('inputVariable','payload'))"/>
<to variable="Invoke_ShipmentService_execute_InputVariable"
part="orderRequest"/>
</copy>
</assign>
<invoke name="Invoke_ShipmentService" partnerLink="ShipmentService"
portType="ns5:execute_ppt" operation="execute"
inputVariable="Invoke_ShipmentService_execute_InputVariable"/>
<invoke name="callbackClient" partnerLink="client"
portType="client:testbpelCallback" operation="onResult"
inputVariable="outputVariable"/>
</sequence>
</process>
CreditCardInvalidTest.xml
<BPELTest processName="testbpel"
xmlns="http://xmlns.oracle.com/bpel/instancedriver"
xmlns:client="http://xmlns.oracle.com/testbpel">
<initiate operation="initiate">
<inboundMessage>
<part fileName="testInput.xml" name="payload"/>
</inboundMessage>
</initiate>
<activityDriver name="callbackClient">
<assertValue variableName="outputVariable" partName="payload"
comparisonMethod="string" fatal="false" patternMatch="false">
<message>Expected "Select Manufacturer"</message>
<actualPath>/client:testbpelProcessResponse/client:result</actualPath>
<expected>Select Manufacturer</expected>
</assertValue>
<assertValue variableName="outputVariable" partName="payload"
comparisonMethod="string" fatal="true" patternMatch="false">
<message>Expected price of "1"</message>
<actualPath>/client:testbpelProcessResponse/client:price</actualPath>
<expected>1</expected>
</assertValue>
</activityDriver>
*<activityDriver name="receiveCompletedTask_ApproveOrder_1">*
*<emulate duration="PT">*
*<inboundMessage>*
*<part fileName="approverResponse.xml" name="payload"/>*
*</inboundMessage>*
*</emulate>*
*</activityDriver>* <--- it waits FOREVER at this bit to receive the approverResponse.xml :s
<activityDriver name="InvokeCreditCardService">
<emulate duration="PT">
<inboundMessage>
<part fileName="creditCardServiceResponse.xml" name="payload"/>
</inboundMessage>
</emulate>
</activityDriver>
<activityDriver name="initiateTask_ApproveOrder_1">
<emulate duration="PT">
<inboundMessage>
<part fileName="getApproval.xml" name="payload"/>
</inboundMessage>
</emulate>
</activityDriver>
</BPELTest>

RaviKiran,
I agree that the explanation oracle provided in the attach link, is a bit confusing. The main goal there is to describe the behavior of processes, when there is a need to combine, or split the transactions within those processes (or in some cases the processes themselves).
The thing is - The default transaction for a synchronous process is requiresNew. That was until version 11.1.1.6. On this last version, you are asking to enter a Transaction parameter when creating a new synchronous bpel process. The default value being prompt is required and that's what causing the problem – You automatically accept the default.
The assumption is, that developing bpel processes, should come with understanding of all those behaviors.
The problem for my understanding is that some of those behaviors were not so cleared until now.
Arik

Test waits forever for a callback from a human task

Hi,
I've create a test to test a BPEL process. Now within the BPEL process there is a call to a human task service. I've emulated the task initiation message which is fine. I also tried to emulate the receive message from the human task service but during the test execution, the test waits forever to receive the callback from the human task service, even though i've specified the return message. Would appreciate help with this! I've posted my testbpel.bpel and the test case (CreditCardInvalidTest.xml) below. For both these files I've highlighted in bold the relevant bits of code that's giving me problems. Thanks
testbpel.bpel:
<?xml version = "1.0" encoding = "UTF-8" ?>
<process name="testbpel" targetNamespace="http://xmlns.oracle.com/testbpel"
xmlns="http://schemas.xmlsoap.org/ws/2003/03/business-process/"
xmlns:wfcommon="http://xmlns.oracle.com/bpel/workflow/common"
xmlns:bpws="http://schemas.xmlsoap.org/ws/2003/03/business-process/"
xmlns:xp20="http://www.oracle.com/XSL/Transform/java/oracle.tip.pc.services.functions.Xpath20"
xmlns:ns4="http://www.oracle.com/XSL/Transform/java/oracle.tip.xref.xpath.XRefXPathFunctions"
xmlns:ns7="http://xmlns.oracle.com/testbpel/creditFault"
xmlns:ldap="http://schemas.oracle.com/xpath/extension/ldap"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:wf="http://schemas.oracle.com/bpel/extension/workflow"
xmlns:ns5="http://oracle.com/esb/namespaces/Fufillment"
xmlns:client="http://xmlns.oracle.com/testbpel"
xmlns:ns6="http://www.creditcardagency.com/CreditCardService"
xmlns:ora="http://schemas.oracle.com/xpath/extension"
xmlns:taskservice="http://xmlns.oracle.com/bpel/workflow/taskService"
xmlns:ns9="http://xmlns.oracle.com/testbpel/orderRejected"
xmlns:ns1="http://xmlns.oracle.com/bpel/workflow/xpath"
xmlns:ns3="http://www.oracle.com/XSL/Transform/java/oracle.tip.esb.server.headers.ESBHeaderFunctions"
xmlns:ns2="http://xmlns.oracle.com/bpel/services/IdentityService/xpath"
xmlns:bpelx="http://schemas.oracle.com/bpel/extension"
xmlns:task="http://xmlns.oracle.com/bpel/workflow/task"
xmlns:orcl="http://www.oracle.com/XSL/Transform/java/oracle.tip.pc.services.functions.ExtFunc"
xmlns:ns8="http://xmlns.oracle.com/testbpel/genericFault">

<partnerLinks>

<partnerLink name="client" partnerLinkType="client:testbpel"
myRole="testbpelProvider" partnerRole="testbpelRequester"/>
<partnerLink name="ShipmentService" partnerRole="execute_pptProvider"
partnerLinkType="ns5:execute_pptLT"/>
<partnerLink name="CreditCardService"
partnerRole="CreditCardServiceProvider"
partnerLinkType="ns6:CreditCardService"/>
<partnerLink myRole="TaskServiceCallbackListener" name="TaskService"
partnerRole="TaskService"
partnerLinkType="taskservice:TaskService"/>
</partnerLinks>

<variables>


<variable name="inputVariable"
messageType="client:testbpelRequestMessage"/>
<variable name="outputVariable"
messageType="client:testbpelResponseMessage"/>
<variable name="n" type="xsd:integer"/>
<variable name="Invoke_ShipmentService_execute_InputVariable"
messageType="ns5:orderRequest_request"/>
<variable name="paymentFault"
messageType="client:testbpelFaultMessage"/>
<variable name="ApproveOrder_1_globalVariable"
messageType="taskservice:taskMessage"/>
<variable name="orderRejectedFault"
messageType="client:testbpelFaultMessage"/>
</variables>
<faultHandlers>
<catchAll>
<sequence name="Sequence_6">
<throw name="Throw_AllFaults"
faultName="ns8:testbpelGenericFault"
faultVariable="paymentFault"/>
</sequence>
</catchAll>
</faultHandlers>

<sequence name="main">

<receive name="receiveInput" partnerLink="client"
portType="client:testbpel" operation="initiate"
variable="inputVariable" createInstance="yes"/>

<scope name="CheckForApproval">
<sequence name="Sequence_4">
<sequence name="Sequence_5">
<scope name="ApproveOrder_1"
xmlns:wf="http://schemas.oracle.com/bpel/extension/workflow"
wf:key="ApproveOrder_1_globalVariable">
<bpelx:annotation>
<bpelx:pattern patternName="bpelx:workflow"></bpelx:pattern>
</bpelx:annotation>
<variables>
<variable name="initiateTaskInput"
messageType="taskservice:initiateTaskMessage"/>
<variable name="initiateTaskResponseMessage"
messageType="taskservice:initiateTaskResponseMessage"/>
</variables>
<correlationSets>
<correlationSet name="WorkflowTaskIdCor"
properties="taskservice:taskId"/>
</correlationSets>
<sequence>
<assign name="ApproveOrder_1_AssignTaskAttributes">
<copy>
<from expression="concat(ora:getProcessURL(), string('/ApproveOrder/ApproveOrder.task'))"/>
<to variable="initiateTaskInput"
part="payload"
query="/taskservice:initiateTask/task:task/task:taskDefinitionURI"/>
</copy>
<copy>
<from expression="number(3)"/>
<to variable="initiateTaskInput"
part="payload"
query="/taskservice:initiateTask/task:task/task:priority"/>
</copy>
<copy>
<from>
<payload xmlns="http://xmlns.oracle.com/bpel/workflow/task"/>
</from>
<to variable="initiateTaskInput"
part="payload"
query="/taskservice:initiateTask/task:task/task:payload"/>
</copy>
</assign>
<assign name="ApproveOrder_1_AssignSystemTaskAttributes">
<copy>
<from expression="ora:getInstanceId()"/>
<to variable="initiateTaskInput"
part="payload"
query="/taskservice:initiateTask/task:task/task:processInfo/task:instanceId"/>
</copy>
<copy>
<from expression="ora:getProcessId()"/>
<to variable="initiateTaskInput"
part="payload"
query="/taskservice:initiateTask/task:task/task:processInfo/task:processName"/>
</copy>
<copy>
<from expression="ora:getProcessId()"/>
<to variable="initiateTaskInput"
part="payload"
query="/taskservice:initiateTask/task:task/task:processInfo/task:processId"/>
</copy>
<copy>
<from expression="ora:getProcessVersion()"/>
<to variable="initiateTaskInput"
part="payload"
query="/taskservice:initiateTask/task:task/task:processInfo/task:processVersion"/>
</copy>
<copy>
<from expression="ora:getDomainId()"/>
<to variable="initiateTaskInput"
part="payload"
query="/taskservice:initiateTask/task:task/task:processInfo/task:domainId"/>
</copy>
<copy>
<from expression="string('BPEL')"/>
<to variable="initiateTaskInput"
part="payload"
query="/taskservice:initiateTask/task:task/task:processInfo/task:processType"/>
</copy>
</assign>
<invoke name="initiateTask_ApproveOrder_1"
partnerLink="TaskService"
portType="taskservice:TaskService"
operation="initiateTask"
inputVariable="initiateTaskInput"
outputVariable="initiateTaskResponseMessage">
<correlations>
<correlation initiate="yes"
set="WorkflowTaskIdCor"
pattern="in"/>
</correlations>
</invoke>
*<receive name="receiveCompletedTask_ApproveOrder_1"*
partnerLink="TaskService"
portType="taskservice:TaskServiceCallback"
operation="onTaskCompleted"
variable="ApproveOrder_1_globalVariable"
createInstance="no">
*<correlations>*
*<correlation initiate="no"*
set="WorkflowTaskIdCor"/>
*</correlations>*
*</receive>* </sequence>
</scope>
<switch name="taskSwitch">
<case condition="bpws:getVariableData('ApproveOrder_1_globalVariable', 'payload', '/task:task/task:systemAttributes/task:state') = 'COMPLETED' and bpws:getVariableData('ApproveOrder_1_globalVariable', 'payload', '/task:task/task:systemAttributes/task:outcome') = 'REJECT'">
<bpelx:annotation>
<bpelx:pattern patternName="case">Task outcome is REJECT</bpelx:pattern>
</bpelx:annotation>
<sequence>
<assign name="AssignOrderRejected">
<copy>
<from expression="string('Order rejected by manager')"/>
<to variable="paymentFault"
part="payload"
query="/client:testbpelProcessFault/client:status"/>
</copy>
</assign>
<throw name="ThrowOrderRejected"
faultName="ns9:orderRejectedFault"
faultVariable="orderRejectedFault"/>
</sequence>
</case>
<case condition="bpws:getVariableData('ApproveOrder_1_globalVariable', 'payload', '/task:task/task:systemAttributes/task:state') = 'COMPLETED' and bpws:getVariableData('ApproveOrder_1_globalVariable', 'payload', '/task:task/task:systemAttributes/task:outcome') = 'APPROVE'">
<bpelx:annotation>
<bpelx:pattern patternName="case">Task outcome is APPROVE</bpelx:pattern>
</bpelx:annotation>
<sequence>
<empty name="Empty_1"/>
</sequence>
</case>
<otherwise>
<bpelx:annotation>
<bpelx:pattern>Task is outcome is EXPIRED, STALE, WITHDRAWN or ERRORED</bpelx:pattern>
</bpelx:annotation>
<sequence>
<empty name="Empty_2"/>
</sequence>
</otherwise>
</switch>
</sequence>
</sequence>
</scope>
<scope name="CheckCreditCard">
<variables>
<variable name="InvokeCreditCardService_process_InputVariable"
messageType="ns6:CreditCardServiceRequestMessage"/>
<variable name="InvokeCreditCardService_process_OutputVariable"
messageType="ns6:CreditCardServiceResponseMessage"/>
</variables>
<sequence name="Sequence_2">
<assign name="Assign_1">
<copy>
<from variable="inputVariable" part="payload"
query="/client:testbpelProcessRequest/client:CreditCardNumber"/>
<to variable="InvokeCreditCardService_process_InputVariable"
part="payload"
query="/ns6:CreditCardServiceProcessRequest/ns6:CreditCardNumber"/>
</copy>
</assign>
<scope name="Scope_1">
<compensationHandler>
<sequence name="Sequence_7">
<empty name="Empty_3"/>
</sequence>
</compensationHandler>
<invoke name="InvokeCreditCardService"
partnerLink="CreditCardService"
portType="ns6:CreditCardService" operation="process"
inputVariable="InvokeCreditCardService_process_InputVariable"
outputVariable="InvokeCreditCardService_process_OutputVariable"/>
</scope>
<switch name="CheckCreditCardValid">
<case condition="bpws:getVariableData('InvokeCreditCardService_process_OutputVariable','payload','/ns6:CreditCardServiceProcessResponse/ns6:result') = 'false'">
<sequence name="Sequence_3">
<assign name="AssignCreditFault">
<copy>
<from expression="string('Invalid credit card number')"/>
<to variable="paymentFault" part="payload"
query="/client:testbpelProcessFault/client:status"/>
</copy>
</assign>
<throw name="ThrowCreditFault"
faultName="ns7:CreditCardNumberFault"
faultVariable="paymentFault"/>
</sequence>
</case>
</switch>
</sequence>
</scope>
<assign name="AssignInitial">
<copy>
<from expression="string('Select Manufacturer')"/>
<to variable="outputVariable" part="payload"
query="/client:testbpelProcessResponse/client:result"/>
</copy>
<copy>
<from expression="1"/>
<to variable="n"/>
</copy>
<copy>
<from expression="0.0"/>
<to variable="outputVariable" part="payload"
query="/client:testbpelProcessResponse/client:price"/>
</copy>
</assign>
<while name="While_1"
condition="bpws:getVariableData('n') <= count(bpws:getVariableData('inputVariable','payload','/client:testbpelProcessRequest/client:input'))">
<sequence name="Sequence_1">
<assign name="DoCalculation">
<copy>
<from expression="bpws:getVariableData('inputVariable','payload', concat('/client:testbpelProcessRequest/client:input[', bpws:getVariableData('n'), ']/client:quantity')) * bpws:getVariableData('inputVariable','payload',concat('/client:testbpelProcessRequest/client:input[', bpws:getVariableData('n'), ']/client:bookPrice')) + bpws:getVariableData('outputVariable','payload','/client:testbpelProcessResponse/client:price')"/>
<to variable="outputVariable" part="payload"
query="/client:testbpelProcessResponse/client:price"/>
</copy>
<copy>
<from expression="bpws:getVariableData('n') + 1"/>
<to variable="n"/>
</copy>
</assign>
</sequence>
</while>
<assign name="Transform_2">
<bpelx:annotation>
<bpelx:pattern>transformation</bpelx:pattern>
</bpelx:annotation>
<copy>
<from expression="ora:processXSLT('TransformOrder.xsl',bpws:getVariableData('inputVariable','payload'))"/>
<to variable="Invoke_ShipmentService_execute_InputVariable"
part="orderRequest"/>
</copy>
</assign>
<invoke name="Invoke_ShipmentService" partnerLink="ShipmentService"
portType="ns5:execute_ppt" operation="execute"
inputVariable="Invoke_ShipmentService_execute_InputVariable"/>
<invoke name="callbackClient" partnerLink="client"
portType="client:testbpelCallback" operation="onResult"
inputVariable="outputVariable"/>
</sequence>
</process>
CreditCardInvalidTest.xml:
<?xml version='1.0' encoding='utf-8'?>
<BPELTest processName="testbpel"
xmlns="http://xmlns.oracle.com/bpel/instancedriver"
xmlns:client="http://xmlns.oracle.com/testbpel">
<initiate operation="initiate">
<inboundMessage>
<part fileName="testInput.xml" name="payload"/>
</inboundMessage>
</initiate>
<activityDriver name="callbackClient">
<assertValue variableName="outputVariable" partName="payload"
comparisonMethod="string" fatal="false" patternMatch="false">
<message>Expected "Select Manufacturer"</message>
<actualPath>/client:testbpelProcessResponse/client:result</actualPath>
<expected>Select Manufacturer</expected>
</assertValue>
<assertValue variableName="outputVariable" partName="payload"
comparisonMethod="string" fatal="true" patternMatch="false">
<message>Expected price of "1"</message>
<actualPath>/client:testbpelProcessResponse/client:price</actualPath>
<expected>1</expected>
</assertValue>
</activityDriver>
*<activityDriver name="receiveCompletedTask_ApproveOrder_1">*
*<emulate duration="PT">*
*<inboundMessage>*
*<part fileName="approverResponse.xml" name="payload"/>*
*</inboundMessage>*
*</emulate>*
*</activityDriver>* <activityDriver name="InvokeCreditCardService">
<emulate duration="PT">
<inboundMessage>
<part fileName="creditCardServiceResponse.xml" name="payload"/>
</inboundMessage>
</emulate>
</activityDriver>
<activityDriver name="initiateTask_ApproveOrder_1">
<emulate duration="PT">
<inboundMessage>
<part fileName="getApproval.xml" name="payload"/>
</inboundMessage>
</emulate>
</activityDriver>
</BPELTest>

Hi hi, on a hunch I previewed the page in the browser, and copy pasted the faces/untitled1 portion of the URL there and pasted on the http://<server_address>:8001/BasicAPPDemo_Root therefore ending with http://<server_address>:8001/BasicAPPDemo_Root/faces/untitled1 and lo and behold I saw the little text box saying "Hello World" ;D
So with that i escalated, switched to the application where the page from BPM was located, deployed it and did the same trick.
But it borked it gave this error:
JBO-29115 Unable to construct the error message due to error java.lang.NullPointerException. Use the exception stack trace and error code to investigate the root cause of this exception. Root cause error code is JBO-.
I figured that the Default generation could be faulty so i created a new page and only recycled the data controls, created everything in read mode, just to test and deployed, when i tested, i was optimistic as the 1st tab didn't had any error (also does not have anything related to the HumanTask, even the data controls) the problem was in the other tabs as I show here.
Many thanks sirs, and sorry for wasting thy time.

RAC 10.2.0.5 - Session waiting forever

Hi, i feel alone
The database has several sessions that are waiting forvever.
Sometimes these sessions are wainting for "direct path read", or "read by other session"
The objects on which the sessions are waiting are never the same (user table, or LOB, ...)
The OS process associated with the database session doesn't exists anymore on the system.
The connection is made with JDBC THIN CLIENT.
NO error messages as the session is just waiting indefinitly
If a start a new session and issue a simple SQL SELECT on the waited objects on both instance.
The first instance return the resultset. The second instance just wait forever.
After the blocked objects is rebuilt, SQL SELECT works fine from both instance.
Killing the waiting sessions doesn't solve the probleme as next same SQL QUERY from the other instance, will be blocked too ...
Rebuild the object solve the problem ...
BUT THIS IS FAR NOT A GOOD SOLUTION !
The database is Oracle 10.2.0.5 SE RAC for LInux RHEL5 x64.
ASM is used.
Thank you for any suggestions !

Hi,
thank you for your response.
This is a STANDARD EDITION with all tables degree set to 1, and all indexes degrees set to 1 or 0.
I kill the session selected with the following query (the ones with high last_call_et)
select inst_id, username, last_call_et, event, row_wait_obj# from gv$session where status='ACTIVE' and state='WAITING' and username is not null;
Sometime, just kill the session solve the problem
Now, i got 1 session waiting forever on "read by other session" on table SYSTEM.SQLPLUS_PRODUCT_PROFILE the SQL executed is
"analyze table infomed2.dm_ligne ....;" .
The same problem appears on 2 differents databases on the same RAC cluster (all in 10.2.0.5)
i guess a bug with dictionnary latch, or with gcs, or with sqlnet( session closed but not realeased), ... but cannot find any information

ProC dequeue process waits forever after network was brought down.

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