Business rules engine faults..

Question

Can someone please advise on what could cause this issue?
We are using SOA suite 11.1.1.2
1. The rules engine takes an input as usual but doesn't send any output.
2. The BPEL process that invokes the rules sends out a bpelFault instead - (because the rules engine doesn't send anything back)
<bpelFault>
<faultType>
<message>0</message>
</faultType>
<selectionFailure>
<part   name="summary" >
<summary>empty variable/expression result. The XPath variable or expression /ns1:callFunctionStatelessDecision/ns1:resultList/ns2:RulesResponse is empty at line 122. An attempt to read or copy data referenced or computed by the XPath expression either had invalid data, according to the XML schema, or did not contain certain optional data. Ensure that the variable or expression result named in the error message is not empty. Enable XML schema validation of related variables to ensure the run-time data is valid. </summary>
</part>
</selectionFailure>
</bpelFault> 3. At other times, the process works fine for the SAME input

Answer 1

Hi Paul:
The short answer is yes.  But its not easy.
You will have to add some references to your orchestration:
System.Transactions.DLL, System.Data.DLL, Microsoft.RuleEngine.DLL
Next the BRE will need a connection string to connect to your database.
Create a Variable in the orchestration ex:  SQLConn of type  System.Data.SqlClient.SqlConnection
Create a Variable in the orchestration ex: RulesConn of type Microsoft.RuleEngine.DataConnection
in an expression shape set the following :
SQLConn = new System.Data.SqlClient.SqlConnection("Initial Catalog=Customer;Data Source=(local);Integrated Security=SSPI;");
RulesConn = new Microsoft.RuleEngine.DataConnection ("database", "tablename", SQLConn);
then call the rules shape.... it should work.
there is a blog post about this I have used in the past:
http://blogs.msdn.com/b/rgarg/archive/2009/04/23/using-biztalk-business-rules-engine-bre-with-database.aspx