WSO2 Proxy: Catch exceptions thrown during runtime? - proxy

Question

Is it possible to catch exceptions thrown during runtime in WSO2 Proxy? My proxy service throws a great deal of exception (in each iteration) and they tend to create much overhead for the ESB which runs short of memory. I would like to catch/suppress these exceptions and let the proxy run to its end after displaying a single error message for each exception.

Answer 1

You can try using makefault as explained here
In your proxy under target you can set faultsequence to point to a sequence defined separately as
Now nameoffaultseq will have code like this , this is supposed to catch runtime exceptions and does for me.
<makefault xmlns="http://ws.apache.org/ns/synapse" version="soap11">
<code xmlns:soap11Env="http://schemas.xmlsoap.org/soap/envelope/" value="soap11Env:VersionMismatch" />
<reason value="test message " />
<role></role>
</makefault>
This is for soap11 response
for non soap like rest you can use something like
<makefault version="pox">
<reason expression="get-property('ERROR_MESSAGE')"/>
</makefault>
<payloadFactory media-type="xml">
<format>
<Error>
<ErrorCode>$1</ErrorCode>
<ErrorDesc>$2</ErrorDesc>
<ErrorSource>$3</ErrorSource>
<ErrorType>SE</ErrorType>
</Error>
</format>
<args>
<arg evaluator="xml" expression="get-property('ERROR_CODE')"/>
<arg evaluator="xml" expression="get-property('ERROR_MESSAGE')"/>
<arg evaluator="xml" expression="get-property('ERROR_EXCEPTION')"/>
</args>
</payloadFactory>
<property name="HTTP_SC" value="500" scope="axis2" type="STRING"/>
<property name="messageType" expression="get-property('AcceptFromConsumer')" scope="axis2" type="STRING"/>`
Where the arguments are standard error properties provided by wso2esb , so in general for runtime exceptions this should be sufficient. More details on error handling are here