Mule Rest exception handling

Question

Mule Flows:

<jersey:resources doc:name="REST">
<component class="com.test.qb.rest.MapIIFContent"/>
<jersey:exception-mapper class="com.test.qb.exception.IIFExceptionMapper" />
</jersey:resources>
<catch-exception-strategy doc:name="Audit Exception" >      
    <set-variable variableName="status" value="Failure" doc:name="Status"/>
    <flow-ref name="QB:audit" doc:name="audit"/>
    <http:response-builder status="500" contentType="application/json" doc:name="Status Code"/>
</catch-exception-strategy>
<logger message=" ===Reached here====" level="INFO" doc:name="Logger"/> <!-- Line 10-->

Java Rest component:

Rest Component:

try{
    String s =null;
    s.toString();// throw nullpointer exception
} catch (IIFException e) {
    return Response.status(500).entity(e.getMessage()).type("Application/json").build();
}
return Response.ok(res).build();

When I run this, it goes to catch block in Java Rest component with error status as 500. But in Mule flows i am expecting flow should reach

'catch-exception-strategy doc:name="Audit Exception" >

block, but it doesn't reach there, instead it reaches to line 10. How do I handle this?

Strange that you have both an exception-mapper and a catch-exception-strategy: isn't the 500 response created in MapIIFContent? What happens if you remove jersey:exception-mapper: does the catch-exception-strategy works? If not, it means jersey:resources exceptions are intercepted by Jersey and never reach Mule. — David Dossot
@DavidDossot, after commenting jersey:exception-mapper, no changes, same flow continues and catch-exception-strategy doesn't work, i.e the problem, jersey exception doesn't reach mule. How to communicate to mule from jersey? — AKB

AKB AKB · Accepted Answer · 2015-06-12T01:50:02

I made rest component to throw checked custom exception instead of returning Rest Response status:

try{
    String s =null;
    s.toString();
} catch (IIFException e) {
    throw new IIFException(e.toString(),e.getCause());
}
return Response.ok(res).build();

And in my exception flows, made it as:

<catch-exception-strategy doc:name="Audit Exception" >
    <expression-component doc:name="Create error response"><![CDATA[#[payload = "{\"status\":\"error\", \"message\":\"" + exception.cause.message + "\"}"]]]></expression-component>
    <http:response-builder status="500" contentType="application/json" doc:name="Status Code"/>
</catch-exception-strategy>

Mule Rest exception handling

1 Answers