I call a wso2 DSS data service, which will return available database rows as response.
I use an Iterate mediator to iterate over the elements and perform the required task.
My issue is when the database has no entries, the data service doesn't return a response but the iterate mediator starts to iterate and throws up an exception in the ESB. Is there a property to tell the iterate mediator only to iterate if elements are available?
Similar to a java if (null) check
Check if there is data before calling iterate mediator :
<filter xpath="boolean($body/something)">
<then>
--> iterate
</then>
</filter>
xpath expression return true if "something" node exist
Related
I have a scanario where i have to make multiple stored procedure calls. If any one of the stored procedures fail, i have to roll back all the procedures.
May i please know how to achieve this using spring jdbc template. What i know is that i can call only one stored procedure using the spring jdbc template.
Is there any way to invoke a group of procedures in sequence using spring jdbc template?
One way of solving this problem is to create another new stored procedure and call all the procedures in this.
Is there any other efficient way to achieve this?
Following code will call multiple stored procedures within the same transaction.
#Transactional(rollbackFor=Exception.class)
public void callStoredProcedures(){
// Stored procedure 1
//....
// Stored procedure n
}
A transaction would be initialized at the method start. All the subsequent database calls within that method will take part in this transaction and any exception within the method context would rollback the transaction.
Note that the transaction rollback for this method is configured for any Exception. By default a transaction is marked for rollback on exceptions of type RuntimeException and JdbcTemplate methods throw DataAccessException which is its subclass. If no rollback is required for checked exceptions the (rollbackFor=Exception.class) can be removed.
Also , for #Transactional annotation to work , enable transaction management. Please go through #EnableTransactionManagement
We are using spring-kafka-2.2.7.RELEASE to produce and consume avro messages and using schema registry for schema validation with 'FORWARD_TRANSITIVE' as the compatibility type. Now, I'm trying to use 'ErrorHandlingDeserializer2 ' from spring-kafka to handle the exception/error when a deserializer fails to deserialize a message. Now I'm trying to write a component test to test this configuration. My component test expected to have below steps.
Spin up a local kafka cluster using docker containers
Send an avro message (using KafkaTemplate) with invalid schema to re-create/simulate the deserialization exception onto a test topic
Now what's happening is, since we have schema registry in place, if i send a message with new schema (invalid schema) it's validating the schema as per the compatibility type setting we have and not letting me producer the message onto kafka by throwing an exception at the producer level itself.
Now my question is, In this scenario, how can I create/simulate the creation of deserialization exception to test my configuration. Please suggest.
Note:- I don't want to disable/stop schema registry because that wouldn't simulate our prod setup.
We have a spring cloud stream app using Kafka. The requirement is that on the producer side the list of messages needs to be put in a topic in a transaction. There is no consumer for the messages in the same app. When i initiated the transaction using spring.cloud.stream.kafka.binder.transaction.transaction-id prefix, I am facing the error that there is no subscriber for the dispatcher and a total number of partitions obtained from the topic is less than the transaction configured. The app is not able to obtain the partitions for the topic in transaction mode. Could you please tell if I am missing anything. I will post detailed logs tomorrow.
Thanks
You need to show your code and configuration as well as the versions you are using.
Producer-only transactions are discussed in the documentation.
Enable transactions by setting spring.cloud.stream.kafka.binder.transaction.transactionIdPrefix to a non-empty value, e.g. tx-. When used in a processor application, the consumer starts the transaction; any records sent on the consumer thread participate in the same transaction. When the listener exits normally, the listener container will send the offset to the transaction and commit it. A common producer factory is used for all producer bindings configured using spring.cloud.stream.kafka.binder.transaction.producer.* properties; individual binding Kafka producer properties are ignored.
If you wish to use transactions in a source application, or from some arbitrary thread for producer-only transaction (e.g. #Scheduled method), you must get a reference to the transactional producer factory and define a KafkaTransactionManager bean using it.
#Bean
public PlatformTransactionManager transactionManager(BinderFactory binders) {
ProducerFactory<byte[], byte[]> pf = ((KafkaMessageChannelBinder) binders.getBinder(null,
MessageChannel.class)).getTransactionalProducerFactory();
return new KafkaTransactionManager<>(pf);
}
Notice that we get a reference to the binder using the BinderFactory; use null in the first argument when there is only one binder configured. If more than one binder is configured, use the binder name to get the reference. Once we have a reference to the binder, we can obtain a reference to the ProducerFactory and create a transaction manager.
Then you would just normal Spring transaction support, e.g. TransactionTemplate or #Transactional, for example:
public static class Sender {
#Transactional
public void doInTransaction(MessageChannel output, List<String> stuffToSend) {
stuffToSend.forEach(stuff -> output.send(new GenericMessage<>(stuff)));
}
}
If you wish to synchronize producer-only transactions with those from some other transaction manager, use a ChainedTransactionManager.
I am new to esb WSO2 and I need to call a .jar with WSO2 parameters. I think I need to create a endpoint and call the jar file. Is it right?
Thanks for all.
I have done this using the Script Mediator (Groovy language). So from within the Groovy script I called my custom method by passing it the payload as JSON and saved the return value of that method as the payload. I used JSON for the payload, but feel free to leave it to default XML. You can also pass parameters, not just the payload, to your custom method.
<script language="groovy">
println "---------- start java call -----------"
mc.setPayloadJSON(new my.own.package.MyClass().myMethod(mc.getPayloadJSON()))
println "----------- end java call ----------"
</script>
Added my custom jar, JSON and Groovy jars under {ESB_ROOT}/repository/components/lib and bounced the WSO2 ESB.
There are probably other ways to achieve what you need.
I need to poll the data in xml format and map it to the EDI 834.........
I have written the stored procedure using for xml auto,element
when i consume it using add adapter metadata i am getting a xml message....
but i need to use this xml message to map it to the EDI834 ....How to get the structure of xml so that i can use that in map....
I also followed http://social.msdn.microsoft.com/Forums/en-US/biztalkgeneral/thread/6a7e0093-0692-4ba5-9e14-0d2090c2cf54
this thread and generated the schems using xml polling and mapped that to EDI834.
But when i use the map into outbound map...It doesnt map the polling data to edi 834..
The WCF-SQL adapter removes the need to use the 'for xml auto, elements' syntax. This is a legacy leftover from the old Sql Adapter.
Just write your stored procedure in a manner to return a consistent result set, then generate metadata against the stored procedure. The adapter framework will create an appropriate schema based on the metadata returned from your stored procedure.
Then simply map the data from your WCF-SQL schema to your EDI834 schema.
Create the stored procedure that returns xml (or xml part) by using the FOR XML PATH syntax
-Setup a receive location using WCF-SQL. Select XmlPolling. Choose a rootname and namespace for the adapter to wrap around the xml returned from SQL (mandatory).
-Set Polling Statement to: exec [SPNAME]
-Set PollDataAvailableStatement to something appropriate that will return a count > 0 if there are rows/xml to be polled.
-Use passthrureceive pipeline for the receive-location
-Set up a send port (FILE) that subscribes to everything that comes from the receiveport used for the receivelocation.
-Start the application. Examine the XML returned from the adapter.
-In VS generate a schema using well-formed XML (Add->Add generated Items->Generate Schemas) (NOTE: You may have to run the InstallWFX.vbs found under the BizTalk SDK/Utilities/Schema generator, if you have not already done this earlier on the machine).
-Choose the xml file generated by the adapter (give the file a name representing the schema you are trying to create).
-Now you should have a schema representing the xml returned by the adapter, you may have to go through the schema manually and change data types to something more appropriate than what the wizard has chosen.