In addition to whatever error handling you may build into your Java classes, CIM includes an XML-level form of basic error handling. If one of your steps encounters an error during execution, you can use the <error> element to specify an alternative step.

In this example. the error element checks to see if there have been changes to CIM’s persisted data made outside of CIM; if so, the UI prompts the user to re-select a product for configuration.

<error>
  <step id="ProductionSelectionPersistenceCheckErrorStep">
    <title>Product Selection Model Update</title>
      <detail>
<![CDATA[
The CIM Product object model has been updated.


REQUIRED ACTION: Re-Execute the Product Selection wizard.  Select [p]
from the Main Menu.
]]>
      </detail>
      <navoption id="continue">
        <label>Continue</label>
        <command type="NEXT_STEP" />
      </navoption>
    </step>
</error>