Mule exception strategies - Reference Exception Strategy

Mule exception strategies - Reference Exception Strategy

• 1.
  MULE Reference Exception Strategy
• 2.
  INDEX What is exception? MuleException Strategy Reference Exception Strategy Configure Reference Exception Strategy Result
• 3.
  What is aexception? An exception is an event, which occurs during the execution of a program, that disrupts the normal flow of the program's instructions. When an error occurs within a method, the method creates an object and hands it off to the runtime system.
• 4.
  Mule Exception Strategy MuleESB provides numerous options for handling errors. Faults that occur within Mule are referred to as exceptions; when an activity in your Mule instance fails, Mule throws an exception. To manage these exceptions, Mule allows to configure various exception strategies. There are five of them – Default Exception strategy Catch exception strategy Roll-back exception strategy Reference exception strategy Choice exception strategy In this presentation we’ll talk about Reference exception strategy.
• 5.
  Reference Exception Strategy Definea reference exception strategy to refer to the error handling parameters defined in a global catch, rollback or choice exception strategy.
• 6.
  Configure Reference ExceptionStrategy (Cont.)Following is the XML code for the flow: <?xml version="1.0" encoding="UTF-8"?> <mule xmlns:jersey="http://www.mulesoft.org/schema/mule/jersey" xmlns:quartz="http://www.mulesoft.org/schema/mule/quartz" xmlns:http="http://www.mulesoft.org/schema/mule/http" xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:doc="http://www.mulesoft.org/schema/mule/documentation" xmlns:spring="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-current.xsd http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd http://www.mulesoft.org/schema/mule/http http://www.mulesoft.org/schema/mule/http/current/mule-http.xsd http://www.mulesoft.org/schema/mule/quartz http://www.mulesoft.org/schema/mule/quartz/current/mule-quartz.xsd http://www.mulesoft.org/schema/mule/jersey http://www.mulesoft.org/schema/mule/jersey/current/mule-jersey.xsd"> <http:listener-config name="HTTP_Listener_Configuration" host="0.0.0.0" port="8080" doc:name="HTTP Listener Configuration"/> <flow name="http_illustrationFlow"> <http:listener config-ref="HTTP_Listener_Configuration" path="/" doc:name="HTTP"/> <component class="http_illustration.ErrorGenerator" doc:name="Java"/> <exception-strategy ref="http_illustrationCatch_Exception_Strategy" doc:name="Reference Exception Strategy"/> </flow> <catch-exception-strategy name="http_illustrationCatch_Exception_Strategy"> <component class="http_illustration.ErrorHandler" doc:name="Java"/> </catch-exception-strategy> </mule>
• 7.
  Configure Reference ExceptionStrategy The diagrammatic view will be – Here I’ve created a flow which listens at 8080 port and then there is an expression with wrong syntax which will throw an exception and then the flow will transfer to Java class inside Catch exception strategy where message “Illustration of Reference Exception strategy.” will be returned to calling entity.
• 8.
  Result  When therewill be a call to this flow from browser, the message returned from java class will there on browser.