To print full exception stack trace in mule , you need to add a grrovy scripting element like this :
<?xml version="1.0" encoding="UTF-8"?>
<mule xmlns:scripting="http://www.mulesoft.org/schema/mule/scripting"
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" version="CE-3.3.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="
http://www.mulesoft.org/schema/mule/scripting http://www.mulesoft.org/schema/mule/scripting/current/mule-scripting.xsd
http://www.mulesoft.org/schema/mule/http http://www.mulesoft.org/schema/mule/http/current/mule-http.xsd
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 ">
<flow name="muleMavenSampleFlow1" doc:name="muleMavenSampleFlow1">
<http:inbound-endpoint exchange-pattern="request-response" host="localhost" port="8081" doc:name="HTTP"/>
<catch-exception-strategy doc:name="Catch Exception Strategy">
<scripting:transformer doc:name="Print StackTrace">
<scripting:script engine="Groovy">
<scripting:text><![CDATA[org.apache.log4j.Logger.getLogger("").error("Error Trace is : \n",exception)]]></scripting:text>
</scripting:script>
</scripting:transformer>
</catch-exception-strategy>
</flow>
</mule>
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