Decision Management & Intelligence (ODM, DI)

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 Custom Exception Handler - dump input data

T. Ibis's profile image
T. Ibis posted Fri April 10, 2026 08:56 AM

Hello,

I have implemented a Custom Exception Handler which dumps all input data (input parameters) to a file, whenever an exception occurs. It works fine for ruleapps which use a XML based XOM (XSD-XOM). Below are some working code fragments provided for better understanding:

Class ExcepHandler.java:

	@Override
	public void handleActionException(Exception arg0, RuleInstance ruleInstance) throws Exception {
		logger.log(Level.SEVERE, "Exception while executing action of rule: " + ruleInstance.getRuleName(), arg0);		
		dumpInData();
		throw arg0;
	}

Class Dump.java:

public static void dumpInData(Map<String, Object> inData, RunningEngine re){
     // No XmlBindingService available for Java-XOM rules...
     xmlBindingService.set(re.getService(XmlBindingService.class));
     xmlDriver.set(xmlBindingService.get().getDataDriver());

     for (String inParamName : inData.keySet()) {
           Object inParamObject = inData.get(inParamName);
           if (inParamObject instanceof IlrXmlObject) {
                 StringWriter sw = new StringWriter();
                 xmlDriver.get().writeObject(xmlObject, sw);
           }
      }
}

The above code lets you write all input data into an XML file.

Problem: There is no XML driver available for ruleapps which use a Java model (Java-XOM). The object inData is not of type IlrXmlObject. It is a custom Java type class (e.g. MyInputData). Regardless of how you call the rule app (XML payload, JSON payload), the object type is not IlrXMLObject.

How do I retrieve the input data/input parameters robustly for Java-XOM ruleapps? Is it possible to retrieve the input data as a JSON payload and dump it into a file, similar to the code above?

Alain Robert's profile image
Alain Robert posted Fri April 10, 2026 09:09 AM

You are already retrieving the parameters  and filtering on IlrXmlObject.  If it is not an XML Object you can use a json serialization library to generate similar output.

see for example https://www.baeldung.com/java-serialization-approaches 

I hope this helps.

T. Ibis's profile image
T. Ibis posted Fri April 10, 2026 09:30 AM

Thank you Alain. I guess I overthinked it😂

Here is the solution for those who are interested:.

import com.fasterxml.jackson.databind.ObjectMapper;

ObjectMapper jsonMapper = new ObjectMapper();
String json = jsonMapper.writeValueAsString(inParamObject);

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