In reference of `org.jberet.spi.JobXmlResolver` it's defined that a resolver that is not responsible should return `null` instead of throwing a runtime exception. The exception prevent that further available resolver will be consider.
```
/**

• Locates the job XML and creates a stream to the contents.
  *

• @param jobXml the name of the job XML with a {@code .xml} suffix

• @param classLoader the class loader for the application
  *

• @return a stream of the job XML or {@code null} if the job XML content was not found
  *

• @throws java.io.IOException if an error occurs creating the stream
  */
  ```