Friday, February 24, 2012

Oracle SOA Suite 11g - Error retrieving NXSD encoding exception in MQ adapter

Oracle SOA Suite 11g - Error retrieving NXSD encoding exception in MQ adapter:

The following exception has been thrown whenever a composite enqueue the message to the Queue through the MQ Adapter.
MQSeriesAdapter PropagateOrderRequest:OrderRequest [ Enqueue_ptt::Enqueue(Request) ] Error retrieving NXSD encoding...>>
<11-Jan-2012 12:58:16 o'clock GMT> <Notice> <Stdout> <BEA-000000> <<11-Jan-2012 12:58:16 o'clock GMT> <Error> <oracle.soa.adapter> <BEA-000000> <MQSeriesAdapter CCRMOM_PropagateOrderRequest:OrderRequest [ Enqueue_ptt::Enqueue(Request) ]
java.lang.NullPointerException
This is a Runtime exception, even after receiving the above exception the messages are successfully enqueued.

The Oracle SOA Suite version in which the issue has been observed is 11.1.1.5.0

Solution to suppress this exception:

               We have applied the patch 13718139 as suggested by oracle and it resolved the issue.
               Download the patch from metalink by specifying the patch number as 13718139.


Saturday, February 18, 2012

Oracle SOA Suite 11g - Callback not reaching the calling service in a Clustered environment

Oracle SOA Suite 11g - Callback not reaching the calling service in a Clustered environment:


In Oracle SOA Suite 10g, we had a scenario like shown in the below diagram.

Process A


Process A calls Process B and waits for the call back; after receiving the call back; The Process A calls again the same Process B and waits for the second call back.
This flow is working fine in 10g but after migrating to 11g the second call back is not reaching the Process A.
In the SOA log file we could able to see the below error message -
an unhandled exception has been thrown in the Collaxa Cube systemr; exception reported is: "javax.persistence.PersistenceException: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.1.3.v20110304-r9073): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLIntegrityConstraintViolationException: ORA-00001: unique constraint (SOA_SOAINFRA.AT_PK) violated

Error Code: 1
Call: INSERT INTO AUDIT_TRAIL (CIKEY, COUNT_ID, NUM_OF_EVENTS, BLOCK_USIZE, CI_PARTITION_DATE, BLOCK_CSIZE, BLOCK, LOG) VALUES (?, ?, ?, ?, ?, ?, ?, ?)
bind => [851450, 5, 0, 118110, 2012-01-12 16:08:04.063, 5048, 3, [[email protected]]
Query: InsertObjectQuery([email protected])
at org.eclipse.persistence.internal.jpa.EntityManagerImpl.flush(EntityManagerImpl.java:744)
After the detail analysis and the Oracle SR, the root cause is “Audit Trail caching issue is causing the process not to get to complete due to the exception while doing the second call back”.
Let’s say in a Cluster with four nodes Process A first created on node 1 and carried on and called first call to Process B and dehydrates. Assume that second call hit a node other than node 1, let’s say node 4. Node 4 carries on doing the work and does the second call to Process B and dehydrates. If the second call back hits Node 1, rather than getting the latest audit trail from database, it’s using the cache and trying to update the audit trial with an id which node 4 already used. That’s throwing an exception and rolling back. For that reason the call back is not getting delivered.
As a temporary solution by switching of the audit trail for Process A, it doesn’t try to insert the data into audit trail and the transaction won’t get roll back and the call has reached successfully.
As a permanent solution, Oracle has provided the patch, the same can be download from the below path.
The issue identified in the SOA Suite version – 11.1.1.5.0


Sunday, February 5, 2012

Currently logged in user is not authorized to modify SOA metadata

Currently logged in user is not authorized to modify SOA metadata

We must have the SOADesigner application role to access Oracle SOA Suite Composer metadata. By default, all the users with Oracle Enterprise Manager Fusion Middleware Control administrator privileges have this role. If you log in to Oracle SOA Composer without this role, you see the following message:
"Currently logged in user is not authorized to modify SOA metadata".

For information about adding the SOADesigner application role to users without administrator privileges, see Oracle Fusion Middleware Administrator's Guide for Oracle SOA Suite and Oracle BPM Suite.
If we are adding the SOADesigner role to the user, the user can edit the DVM’s and the rules.I could not able to find out read only access for the SOAComposer application.


Friday, February 3, 2012

WLST script to create JDBC Multi Data Source in weblogic server

Creating JDBC Multi Data Source through WLST in weblogic server

This tutorial explains the approach to create JDBC Multi data source through WLST script in weblogic

Refer the below URL for details on JDBC Multi data source.

https://www.albinsblog.com/2012/02/jdbc-multi-data-sources-in-weblogic.html

WLST Script


The below WLST script creates the JDBC Multi data source with enabled configurations

CreateMultiDataSource.py

adminURL='t3://localhost:7001'
adminUserName='weblogic'
adminPassword='weblogic1'
connect(adminUserName, adminPassword, adminURL)
edit()
startEdit()
jdbcSystemResource = create("MS1","JDBCSystemResource")
jdbcResource = jdbcSystemResource.getJDBCResource()
jdbcResource.setName("MS1")
dsParams = jdbcResource.getJDBCDataSourceParams()
jndiName='jdbc/MS1'
dsParams.setJNDINames([jndiName])
dsParams.setAlgorithmType('Failover')
dsParams.setDataSourceList('DS1,DS2')
dsParams.setFailoverRequestIfBusy(true)
jdbcSystemResource.addTarget(getMBean('Servers/AdminServer'))
print('MDS1 created successfully...')
save()
activate()
disconnect()



Script

https://github.com/techforum-repo/youttubedata/blob/master/scripts/wlst/CreateMultiDataSource.py

Before executing the script, change the configurations as required.

The individual data sources(DS1 & DS2) should be created before executing the script




Execute the script — <<Oracle_Home>>\oracle_common\common\bin\wlst.cmd CreateMultiDataSource.py

Now the JDBC Multi source is created with required configurations









JDBC Multi Data Sources in weblogic server


JDBC Multi Data Sources in weblogic server:

A multi data source is an abstraction around a group of data sources that provides load balancing or failover processing between the data sources associated with the multi data source. Multi data sources are bound to the JNDI tree or local application context just like data sources are bound to the JNDI tree. The Multi Data Source can be used in the same way as we use a Data Source.


When an application requests a connection, the Multi Data Source determines which data source will provide a connection based on the selected algorithm.
Create two or more data sources, and then create a Multi Data Source and assign data sources to the Multi Data Source.



Configurations for the Multi Data Source.

Algorithm Type


Load-Balancing


Connection requests to a load-balancing multi data source are served from any data source in the list. The multi data source selects data sources to use to satisfy connection requests using a round-robin scheme. When the multi data source provides a connection, it selects a connection from the data source listed just after the last data source that was used to provide a connection. Multi data sources that use the Load Balancing algorithm also fail over to the next data source in the list if a database connection test fails and the connection cannot be replaced, or if the data source is suspended.

Failover


The Failover algorithm provides an ordered list of data sources to use to satisfy connection requests. Normally, every connection request to this kind of multi data source is served by the first data source in the list. If a database connection test fails and the connection cannot be replaced, or if the data source is suspended, a connection is sought sequentially from the next data source on the list.

FailoverRequestIfBusy


With the Failover algorithm, this attribute enables failover when all connections in a data source are in use.

TestFrequencySeconds


This attribute controls the frequency at which Weblogic Server checks the health of data sources previously marked as unhealthy to see if connections can be recreated and if the data source can be re-enabled.