My "virtual friend" Unnikrishnan Pillai, who I've worked with when calling Oracle Support in the past recently posted an example WLST script for creating JDBC datasources, which ended with "MultiDataSources coming soon..." (See Unni's Blog Post: http://unni-at-work.blogspot.com/2009/02/creating-jdbc-data-source-using-wlst_20.html ) I tried to add a comment to his blog with my own example WLST script for creating MultiDatasources, but received an error, so I figured I would post it here, and Unni... you can feel free to take this as a starting point and clean it up, or ignore it completely. But, I thought I would share in case there is anyone out there wondering how to do this. Feel free to post comments and/or ask questions if you need help with this script. The script creates a multiu datasource, pointing to 2 instances of an Oracle 10G RAC database...

connect('weblogic','weblogic','t3://localhost:70001')
edit()
startEdit(-1,-1,'false')

cd('/')
cmo.createJDBCSystemResource('DS1')
cd('/JDBCSystemResources/DS1/JDBCResource/DS1')
set('Name','DS1')
cd('/JDBCSystemResources/DS1/JDBCResource/DS1/JDBCDataSourceParams/DS1')
set('JNDINames',jarray.array([String('DS1')], String))
cd('/JDBCSystemResources/DS1/JDBCResource/DS1/JDBCDriverParams/DS1')
set('Url','jdbc:oracle:thin:@myDBServer1:1521:myDBSchema1')
set('DriverName','oracle.jdbc.xa.client.OracleXADataSource')
set('Password','myPass')
cd('/JDBCSystemResources/DS1/JDBCResource/DS1/JDBCConnectionPoolParams/DS1')
set('TestTableName','SQL SELECT 1 FROM DUAL')
cd('/JDBCSystemResources/DS1/JDBCResource/DS1/JDBCDriverParams/DS1/Properties/DS1')
cmo.createProperty('user')
cd('/JDBCSystemResources/DS1/JDBCResource/DS1/JDBCDriverParams/DS1/Properties/DS1/Properties/user') set('Value','myUser')
cd('/JDBCSystemResources/DS1/JDBCResource/DS1/JDBCDataSourceParams/DS1')
set('GlobalTransactionsProtocol','TwoPhaseCommit')
cd('/JDBCSystemResources/DS1')
set('Targets',jarray.array([ObjectName('com.bea:Name=AdminServer,Type=Server')], ObjectName))

cd('/')
cd('/JDBCSystemResources/DS2/JDBCResource/DS2')
set('Name','DS2')
cd('/JDBCSystemResources/DS2/JDBCResource/DS2/JDBCDataSourceParams/DS2')
set('JNDINames',jarray.array([String('DS2')], String))
cd('/JDBCSystemResources/DS2/JDBCResource/DS2/JDBCDriverParams/DS2')
set('Url','jdbc:oracle:thin:@myDBServer2:1521:myDBSchema2')
set('DriverName','oracle.jdbc.xa.client.OracleXADataSource')
set('Password','myPass')
cd('/JDBCSystemResources/DS2/JDBCResource/DS2/JDBCConnectionPoolParams/DS2')
set('TestTableName','SQL SELECT 1 FROM DUAL')
cd('/JDBCSystemResources/DS2/JDBCResource/DS2/JDBCDriverParams/DS2/Properties/DS2')
cmo.createProperty('user')
cd('/JDBCSystemResources/DS2/JDBCResource/DS2/JDBCDriverParams/DS2/Properties/DS2/Properties/user')
set('Value','slims_upt')
cd('/JDBCSystemResources/DS2/JDBCResource/DS2/JDBCDataSourceParams/DS2')
set('GlobalTransactionsProtocol','TwoPhaseCommit')
cd('/JDBCSystemResources/DS2')
set('Targets',jarray.array([ObjectName('com.bea:Name=AdminServer,Type=Server')], ObjectName))

cd('/')
cmo.createJDBCSystemResource('MultiDS')
cd('/JDBCSystemResources/MultiDS/JDBCResource/MultiDS')
set('Name','MultiDS')
cd('/JDBCSystemResources/MultiDS/JDBCResource/MultiDS/JDBCDataSourceParams/MultiDS')
set('JNDINames',jarray.array([String('MultiDS')], String))
set('AlgorithmType','Load-Balancing')
set('DataSourceList','DS1,DS2')
cd('/JDBCSystemResources/MultiDS')
set('Targets',jarray.array([ObjectName('com.bea:Name=AdminServer,Type=Server')], ObjectName))

activate()