mule - Exception not being caught in mulesoft -
i working on app , in case exception occurs prints exception message appropriately.here custom filter
package filter; import java.io.ioexception; import java.util.map; import javax.servlet.servletexception; import javax.servlet.servletrequest; import javax.servlet.servletresponse; import org.mule.api.mulemessage; public class exceptionclass implements org.mule.api.routing.filter.filter { @override public boolean accept(mulemessage message) { map<string,object> payload=(map<string,object>)message.getpayload(); if(!payload.containskey("productid")) { throw new java.lang.nullpointerexception("no data found in payload "+payload.tostring()); } if(integer.parseint((string) payload.get("productid"))<5) { throw new illegalargumentexception("invalid input payload " +payload.tostring()); } return true; } } here configuration of app
<?xml version="1.0" encoding="utf-8"?> <mule xmlns:json="http://www.mulesoft.org/schema/mule/json" 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/json http://www.mulesoft.org/schema/mule/json/current/mule-json.xsd"> <http:listener-config name="http_listener_configuration" host="0.0.0.0" port="8081" doc:name="http listener configuration"/> <flow name="muleexceptionhandlingflow"> <http:listener config-ref="http_listener_configuration" path="/" doc:name="http" > <http:response-builder statuscode="#[flowvars['statuscode']]" reasonphrase="#[flowvars['reason']]"/> </http:listener> <json:json-to-object-transformer returnclass="java.util.hashmap" doc:name="json object"/> <custom-filter doc:name="custom" class="filter.exceptionclass"/> <logger message="payload:#[payload]" level="info" doc:name="logger"/> <logger message="#[message]" level="info" doc:name="logger"/> <set-payload value="payload:#[payload]" doc:name="set payload"/> </flow> <choice-exception-strategy name="muleexceptionhandlingchoice_exception_strategy"> <catch-exception-strategy doc:name="catch missing data exception strategy" logexception="false" when="#[exception.causedby(java.lang.nullpointerexception)]"> <set-payload value="missing data:#[payload]" doc:name="set payload"/> <set-variable variablename="reason" value="missing input data" doc:name="variable"/> <set-variable variablename="statuscode" value="400" doc:name="variable"/> </catch-exception-strategy> <catch-exception-strategy doc:name="catch invalid data exception strategy" logexception="false" when="#[exception.causedby(java.lang.illegalargumentexception)}"> <set-payload value="invalid data:#[payload]" doc:name="set payload"/> <set-variable variablename="reason" value="invalid input" doc:name="variable"/> <set-variable variablename="statuscode" value="400" doc:name="variable"/> </catch-exception-strategy> </choice-exception-strategy> </mule> and here error message in case of nullpointer exception
error 2017-07-25 17:35:49,595 [[muleexceptionhandling].http_listener_configuration.worker.01] org.mule.exception.defaultmessagingexceptionstrategy: ******************************************************************************** message : no data found in payload {price=1000, productname=shampoo} (java.lang.nullpointerexception). payload
: {price=1000, productname=shampoo} payload type : java.util.hashmap filter : filter.exceptionclass@584d4f19 element : /muleexceptionhandlingflow/processors/1 @ muleexceptionhandling:null:null -------------------------------------------------------------------------------- root exception stack trace: java.lang.nullpointerexception: no data found in payload {price=1000, productname=shampoo} @ filter.exceptionclass.accept(exceptionclass.java:23) @ org.mule.routing.messagefilter.accept(messagefilter.java:93) @ org.mule.processor.abstractfilteringmessageprocessor.process(abstractfilteringme ..................................
why exception not getting caught exception handler
please guide!
the reason exception strategy not getting called because have exception strategy outside block. update below:
<flow name="muleexceptionhandlingflow"> <http:listener config-ref="http_listener_configuration" path="/" doc:name="http" > <http:response-builder statuscode="#[flowvars['statuscode']]" reasonphrase="#[flowvars['reason']]"/> </http:listener> <json:json-to-object-transformer returnclass="java.util.hashmap" doc:name="json object"/> <custom-filter doc:name="custom" class="filter.exceptionclass"/> <logger message="payload:#[payload]" level="info" doc:name="logger"/> <logger message="#[message]" level="info" doc:name="logger"/> <set-payload value="payload:#[payload]" doc:name="set payload"/> <choice-exception-strategy name="muleexceptionhandlingchoice_exception_strategy"> <catch-exception-strategy doc:name="catch missing data exception strategy" logexception="false" when="#[exception.causedby(java.lang.nullpointerexception)]"> <set-payload value="missing data:#[payload]" doc:name="set payload"/> <set-variable variablename="reason" value="missing input data" doc:name="variable"/> <set-variable variablename="statuscode" value="400" doc:name="variable"/> </catch-exception-strategy> <catch-exception-strategy doc:name="catch invalid data exception strategy" logexception="false" when="#[exception.causedby(java.lang.illegalargumentexception)}"> <set-payload value="invalid data:#[payload]" doc:name="set payload"/> <set-variable variablename="reason" value="invalid input" doc:name="variable"/> <set-variable variablename="statuscode" value="400" doc:name="variable"/> </catch-exception-strategy> </choice-exception-strategy> </flow> i reading through blogs use-case , struck me though code work , give result expected, filters have been designed stop flow if returns false , design not throw exception. have 2 cleaner options handle scenario. (i) use validation component, mule intends use if want perform input validations.
so example, validation rule -
<validation:is-true config-ref="validation_configuration" expression="#[payload.containskey('productid')]" message="payload doesnt have productid" doc:name="validation"/> more interestingly, can put multiple validations in same component using option:- like
<validation:all config-ref="validation_configuration" doc:name="validation"> <validation:validations> <validation:is-true expression="#[integer.parseint((string) payload.get("productid"))<5]" message="prod id less 5"/> <validation:is-true expression="#[payload.containskey('productid')]" message="no product id"/> </validation:validations> </validation:all> if explore component more, find ways catch validation exceptions using custom exceptions or using message string logged part of exception message.
(ii) use filter have used, wrap around message-filter component explained in below blog: https://www.ricston.com/blog/playing-with-mule-filters/ in example, can achieve exception below expression filter:
<message-filter doc:name="message" throwonunaccepted="true"> <expression-filter expression="#[payload.containskey("productid")]" doc:name="expression"/> </message-filter>
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