Get Return value from stored procedure call in Mule 3.5.0 ESB - sql-server-2005

Question

Using Mule CE 3.5.0 & SQL Server 2005.
I'm trying to call a stored procedure using the new Mule connectors db:generic-config & db:stored-procedure and then retrieve the return value from the stored procedure.
For some reason I can't get Mule to retrieve the return value from the stored procedure.
Here is sample stored procedure code,
CREATE PROCEDURE dbo.sp_AddConnection (#pUserName varchar(30),
#pPassword varchar(30),
#opConnectionID bigint OUTPUT)
AS
BEGIN
SET NOCOUNT ON;
DECLARE #rc int;
SET #opConnectionID = 0;
....
--If login is good then
--SET #rc = 0
--SET #opConnectionID = new ConnectionID from Connection table
--If login is bad then
--SET #rc = 1
--SET #opConnectionID = 0
....
SET NOCOUNT OFF;
RETURN(#rc);
END;
The following Mule code works to retrieve the ConnectionID output parameter.
<db:generic-config name="MSSQL"
url="jdbc:sqlserver://local:1433;user=username;password=password;applicationName=Mule-ESB;databaseName=db1;"
driverClassName="com.microsoft.sqlserver.jdbc.SQLServerDriver"
doc:name="Generic Database Configuration"/>
<flow name="jdbctestFlow1" doc:name="jdbctestFlow1">
<quartz:inbound-endpoint jobName="CronJobSchedule"
doc:name="Quartz"
repeatInterval="0"
responseTimeout="10000"
cronExpression="00 29 01 ? * *"> <!-- Change as necessary --->
<quartz:event-generator-job/>
</quartz:inbound-endpoint>
<db:stored-procedure config-ref="MSSQL" doc:name="Database">
<db:parameterized-query><![CDATA[{ CALL dbo.sp_Add_Connection(:pUserName, :pPassword, :opConnectionID) }]]></db:parameterized-query>
<db:in-param name="pEmail" type="VARCHAR" value="user1"/>
<db:in-param name="pPassword" type="VARCHAR" value="1234"/>
<db:inout-param name="opConnectionID" type="BIGINT" value="0"/>
</db:stored-procedure>
<logger message="opConnectionID = #[message.payload['opConnectionID']]" level="INFO" doc:name="Logger"/>
</flow>
The above Mule flow works and I can
I can get the ConnectionID output variable with #[message.payload['opConnectionID']].
Next I changed db:stored-procedure element to try and get the return value.
<flow name="jdbctestFlow1" doc:name="jdbctestFlow1">
<quartz:inbound-endpoint jobName="CronJobSchedule"
doc:name="Quartz"
repeatInterval="0"
responseTimeout="10000"
cronExpression="00 29 01 ? * *"> <!-- Change as necessary --->
<quartz:event-generator-job/>
</quartz:inbound-endpoint>
<db:stored-procedure config-ref="MSSQL" doc:name="Database">
<db:parameterized-query><![CDATA[{ CALL :returnValue = dbo.sp_Add_Connection(:pUserName, :pPassword, :opConnectionID) }]]></db:parameterized-query>
<db:out-param name="returnValue" type="INTEGER"/>
<db:in-param name="pEmail" type="VARCHAR" value="user1"/>
<db:in-param name="pPassword" type="VARCHAR" value="1234"/>
<db:inout-param name="opConnectionID" type="BIGINT" value="0"/>
</db:stored-procedure>
<logger message="Finish SP call" level="INFO" doc:name="Logger"/> <!-- doens't make it here -->
<logger message="opConnectionID = #[message.payload['opConnectionID']]" level="INFO" doc:name="Logger"/>
<logger message="returnValue = #[message.payload['returnValue']]" level="INFO" doc:name="Logger"/>
</flow>
Mule throws the following error,
********************************************************************************
Message : Index: 5, Size: 5 (java.lang.IndexOutOfBoundsException). Message payload is of type: NullPayload
Code : MULE_ERROR--2
--------------------------------------------------------------------------------
Exception stack is:
1. Index: 5, Size: 5 (java.lang.IndexOutOfBoundsException)
java.util.LinkedList:-1 (null)
2. Index: 5, Size: 5 (java.lang.IndexOutOfBoundsException). Message payload is of type: NullPayload (org.mule.api.MessagingException)
org.mule.execution.ExceptionToMessagingExceptionExecutionInterceptor:32 (http://www.mulesoft.org/docs/site/current3/apidocs/org/mule/api/MessagingException.html)
--------------------------------------------------------------------------------
Root Exception stack trace:
java.lang.IndexOutOfBoundsException: Index: 5, Size: 5
at java.util.LinkedList.checkElementIndex(Unknown Source)
at java.util.LinkedList.get(Unknown Source)
at org.mule.module.db.internal.domain.executor.AbstractExecutor.doProcessParameters(AbstractExecutor.java:51)
+ 3 more (set debug level logging or '-Dmule.verbose.exceptions=true' for everything)
********************************************************************************
I'm thinking it may be a Mule CE vs Mule EE thing but I don't see anything in the reference docs saying this functionality is only available in Mule EE.
It may also be that I'm just calling the db:stored-procedure incorrectly.
Any clues to point me in the right direction would be appreciated.
Thanks in advance.

Answer 1

I think the problem is that you don't have the parameter returnValue defined in you stored procedure.
you should have something like this:
CREATE PROCEDURE dbo.sp_AddConnection (#pUserName varchar(30),
#pPassword varchar(30),
#opConnectionID bigint OUTPUT,
#returnValue int OUTPUT)
and also de parametrized query:
<db:parameterized-query><![CDATA[{ CALL :returnValue = dbo.sp_Add_Connection(:pUserName, :pPassword, :opConnectionID, :returnValue) }]]></db:parameterized-query>