BPEL process initiated by a database adapter causing problems in HA environ

We are having a High Availability architecture configuration(active - active) for the BPEL System in our production environment.
The BPEL servers are clustered in the middle tier of the architecture and RAC is used in the database tier of the architecture.
We have a BPEL process which is initiated by a database adapter.
This BPEL process polls a source database, reads the data, writes it into a JMS Topic and marks flag as read back to the table.
A Message Driven Bean(MDB) listens to the JMS Topic, and writes the data in the destination database.
We have the polling process and the MDB deployed to both the nodes of the BPEL server.
We have noticed that some records are getting processed by both the nodes.
This is resulting in duplicate records at the destination tables.
Kindly advise how we can resolve this issue.

The BPEL servers are configured with active - active topology and RAC is used in the database tier of the architecture.
BPEL Servers is not clustered. Load Balancer is used in front of the two nodes of the BPEL servers.

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<toplink:right xsi:type="toplink:constant-expression">
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<toplink:cache-usage>primary-key</toplink:cache-usage>
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<toplink:container xsi:type="toplink:list-container-policy">
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<toplink:timeout>0</toplink:timeout>
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<toplink:cache-usage>primary-key</toplink:cache-usage>
<toplink:lock-mode>none</toplink:lock-mode>
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<toplink:collection-type>java.util.Vector</toplink:collection-type>
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</opm:queries>
<toplink:does-exist-query xsi:type="toplink:does-exist-query">
<toplink:existence-check>check-database</toplink:existence-check>
</toplink:does-exist-query>
<toplink:read-all-query xsi:type="toplink:read-all-query">
<toplink:reference-class>ExpiredTripPoller.Trip</toplink:reference-class>
<toplink:container xsi:type="toplink:list-container-policy">
<toplink:collection-type>java.util.Vector</toplink:collection-type>
</toplink:container>
</toplink:read-all-query>
</opm:querying>
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<opm:attribute-mapping xsi:type="toplink:direct-mapping">
<opm:attribute-name>id</opm:attribute-name>
<opm:field table="TRIP" name="ID" xsi:type="opm:column"/>
<opm:attribute-classification>java.math.BigDecimal</opm:attribute-classification>
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<opm:attribute-mapping xsi:type="toplink:direct-mapping">
<opm:attribute-name>lpn</opm:attribute-name>
<opm:field table="TRIP" name="LPN" xsi:type="opm:column"/>
<opm:attribute-classification>java.lang.String</opm:attribute-classification>
</opm:attribute-mapping>
<opm:attribute-mapping xsi:type="toplink:direct-mapping">
<opm:attribute-name>startTime</opm:attribute-name>
<opm:field table="TRIP" name="START_TIME" xsi:type="opm:column"/>
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Cheers

Please take a look at this article which states SYSDATE is not supported in a
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http://www.oracle.com/technology/pub/articles/bpel_cookbook/qualcomm-bpel.html
Excerpt from the article:
Here are three important things you should do in implementing the above design:
Have the status of the record being processed stored in the database. The status includes the process state, next process attempt time, and processing attempt count.
Create an updatable view that exposes only records that are ready to be processed. A view is needed because the database adapter cannot handle a where clause that compares against SYSDATE.
Design logic that determines if a process instance that has faulted should be retried and when the retry should occur. This information will be updated in the database by use of a stored procedure. This can also be done with an update partner link and additional logic in BPEL.
mahalo,
a iii

Invoking JDev bpel process from Eclipse BPEL Process?

Is it possible to invoke a bpel process (with dbadapter) developed in JDev from a bpel process created in Eclipse (Designer)?

I was unsuccessful.
Scenario:
I was trying to invoke jdev bpel process (that had a database adapter to update the database) from Eclipse bpel process (since we do not have adapters in Eclipse designer).
The namespace wasn't known by Eclipse( some schema missing?) and therefore we couldn't compile it.

11g Database Adapter issue

Hi there,
I have a very simple BPEL process which just use Database Adapter to response result from one table, every thing works ok but a column with 'ROWID' datatype get a wrong data.
Which means when the data in table is 'AAAOOMAAPAAAgGVAAl', the BPEL output is 'QUFBT09NQUFQQUFBZ0dWQUFs', i try to modify the xxx-or-mapping.xml and xxx-properties.xml but still no luck.
Any ideas?

Hi AJ,
Thanks for your reply.
In fact, i can't remove the ROWID type column. it is very important for business logic, the table is hosted on third party database, i have no right to do any change.
below is the table struct:
table PULL_STOCK_TRANSFER
ISSUE_PLANT NOT NULL VARCHAR2(4)
RCVNG_PLANT NOT NULL VARCHAR2(4)
ISSUE_DATE NOT NULL DATE
PART_CODE NOT NULL VARCHAR2(18)
QUANTITY NOT NULL NUMBER(13,3)
FLAG CHAR(1)
PROCESSED CHAR(1)
REMARKS VARCHAR2(200)
TRACKING_ID ROWID
ISSUE_LOCATION NOT NULL VARCHAR2(2)
RCVNG_LOCATION NOT NULL VARCHAR2(2)
And there have no problem on 10g.
So any ideas?
-Ray

Database Adapter: How to Insert when one column is an identity column

Hi everyone
I'm developing a BPEL process who uses a database adapter to insert a row in a table of an SQL Server database. The problem is that the database adapter tries to insert a null value into the field that is the primary key of the table so the process fails. This is because I don't want to specify any value to this field because this field is specified in sql server as an identity column so this field doesn't need to have a value provided.
I suppose the only solution is to set the database adapter to not insert any value to this field but how can i do that? is there any way to make the database adapter to insert data in only a few fields of a table and not in all fields, trying to insert null in these fields that no data have been provided?
Thank You Very Much!

In JDev->Applications Navigator->your project->Application Sources->Toplink->toplink_mappings.
Upon selecting "toplink_mappings" in the structure window you will see the package. Expand to see your tables. Double click your table and it will open file in main area. Select your field that has identity column. And at the botton you will see "Use Sequencing" check box make sure you uncheck it.
This will solve your problem.
Dipal

Database Adapter Merge with char/varchar primary key

Hi guys,
It seems as though merge statements in BPEL database adapters do not work if the primary key of the table contains a char/varchar. This is in Jdeveloper 10.1.3.4.0
If I create the table below:
create table test_merge (
id        number primary key,
text      varchar2(255)
);Then the merge operation will update and insert as expected. However, if I create the same table but with id as a char/varchar, then the merge statement will never update.
It seems like it never finds a record with the same id (if it is a char/varchar), and always attempts to insert, which results in unique key constraint errors for the primary key column.
Has anyone else encountered this issue and found a way to get the merge statement to work correctly? I can obviously perform the select myself, and then conditionally update/insert, but I would prefer the merge to work as expected.
Thanks

After investigating further, it seems that even a database adapter select is not working correctly. Consider the following table:
create table test_merge (
id        varchar2(255) primary key,
text      varchar2(255)
);And I have inserted a record with id = "1" and text="abc"
If I create a BPEL process and add a database adapter (with only the select checkbox ticked) with the following SQL:
SELECT ID, TEXT FROM TEST_MERGE WHERE (ID = #id)If I invoke this adapter, passing in "1" as the id, then a record is returned, with the correct text (i.e. "abc") BUT the id returned is "-9900000000000000000000000000"
Can anyone explain why this is happening?

OWSM EMPTY BPEL PROCESS VIRTUALIZATION PROBLEM!!!!!!!!!!

Hi,
I developed an EMPTY BPEL PROCESS which gets instantiated by a FILE ADAPTER . I am trying to virtualize the process by using OWSM GATEWAYS, but get error when i test it in the test page option unders tools link in OWSM MONITOR.
I am also not sure about the efficacy of using gateways to virtualize an EMPTY BPEL PROCESS.
CAN WE USE GATEWAYS TO VIRTUALIZE AN EMPTY BPEL PROCESS INITIATED BY A FILE ADAPTER???????
Regards,
Vishnu

Hi,
I developed an EMPTY BPEL PROCESS which gets instantiated by a FILE ADAPTER . I am trying to virtualize the process by using OWSM GATEWAYS, but get error when i test it in the test page option unders tools link in OWSM MONITOR.
I am also not sure about the efficacy of using gateways to virtualize an EMPTY BPEL PROCESS.
CAN WE USE GATEWAYS TO VIRTUALIZE AN EMPTY BPEL PROCESS INITIATED BY A FILE ADAPTER???????
Regards,
Vishnu

Is it possible to trigger a bpel process from a database object.

Hi,
We want to schedule a bpel process to run daily .So we want to trigger it from a database job.
Is it possible to call a bpel process from database..?
Or
Is there any way to schedule a bpel process from bpel server it self.
Thank you
Gayaz

If you know about DBMS_JOBs then I would say the easiest way to invoke a BPEL process is via the AQ adapter. You just need to populate an AQ and a way you go. The good thing about this is that if SOA SUite is down when the schedule is run you don't need to retry, it will be picked up when it comes online again.
cheers
James

BPEL process initiated by a database adapter causing problems in HA environ

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