SOA AIA Error Handling
Error handling in SOA using
AIA Foundation pack.
Exception handling in SOA can be achieved by calling AIA FP OOB’s
AIAAsyncErrrorHandlingBPELProcess.
AIAAsyncErrrorHandlingBPELProcess can be invoked in 2 ways.
1.
Using
fault policies
2.
Directly invoking AIAAsyncErrrorHandlingBPELProcess from Catch
Activity.
Using Fault Policies
Steps involved in using fault policies.
1.
Add “EBM_HEADER” variable and populate “
EBM_HEADER “variable.
<variable name="EBM_HEADER" element="corecom:EBMHeader"/>
This variable is used in populating the “FaultNotification” element of AIAAsyncErrorHandlerBPELProcess,
when invoked by fault policies.
Find the sample XSL used to populate
EBM_HEADER
2.
Define a fault policy for the BPEL process and
bind the process with this policy in fault-bindings.xml.
We can use specific fault policy for each
process and store then in project directory or MDS.
We can use a Generic fault policy with
covers standard exceptions and use the same in all BPEL processes. This policy
has to be stored on MDS.
<property
name="oracle.composite.faultPolicyFile">oramds:/apps/cfa/payroll/faultPolicies/fault-policies.xml</property>
<property
name="oracle.composite.faultBindingFile">oramds:/apps/cfa/payroll/faultPolicies/fault-bindings.xml</property>
3.
Populating FaultNotification element of
AIAAsyncErrorHandlerBPELProcess’s Request message
Make sure “EBM_to_Fault.xsl” is in place in
‘XSL’ folder in project directory. Fault
polices use this is transformation file
to populate the notification message..
<from
expression="ora:processXSLT('xsl/EBM_to_Fault.xsl',bpws:getVariableData('EBM_HEADER'))"/> <to
variable="AIAAsyncErrorHandlingBPELProcessRequestMessage" part="FaultMessage"
query="/corecom:Fault"/>
Above code is executed by fault policies to populate the
FaultNotification Message. SO EBM_HEADER
variable and EBM_to_Fault.xsl are expected.
4.
Define catch and catchall blocks in BPEL
process.
CompositeJavaAction in fault policies
rethrow the error after the specified action. BPEL process catches that
exception to show as faulted in EM console.
So we need to create separate Catch blocks for the exception conditions
specified in fault policies.
Directly invoking AIAAsyncErrrorHandlingBPELProcess from Catch Activity.
For Invoking AIAAsyncErrrorHandlingBPELProcess directly
from catch and catchall blocks, we can follow the steps as mentioned above or
we can directly populate all the
elements in Catch or catchall blocks.
1.
Invoke AIAAsyncErrrorHandlingBPELProcess from
Catch block.
2.
Populate atleast below elements in the Request
message body
1.
CompositeInstance ID
2.
BPEL Process Name
3.
Payload Key (
Location number, employee number)
4.
TimeStamp
3.
Once the AIAAsyncErrrorHandlingBPELProcess has
been invoked. Rethrow the exception, so that process appears as faulted in EM
console
