Access error information

When we use the IBM Digital Data Connector, we can access error messages for problems that occurred during the bean list computation.

Computing the bean list objects that result from setting a specific list-rendering context can fail due to various reasons. For example, there can be network problems, or the backend service that normally serves the data can be down. In this situation, the resulting bean list is empty and does not contain any items. To detect whether an error occurred and to access the error message the DDC framework generates for the error situation, access the [Plugin:ListRenderingContext] plug-in.

To detect whether an error occurred, we can add the following WCM tag to the design:

[Plugin:ListRenderingContext action="exceptionOccured"]

If the bean list computation succeeds, the plug-in writes the string false. If it fails, the plug-in writes the string true. To render different types of markup in the two situations, use the [Plugin:Equals] tag.

To access the error message if an error occurred, add the following WCM tag to the design:

[Plugin:ListRenderingContext action="getExceptionMessage" escape="xml"]

If the bean list computation fails, the plug-in writes the exception message. If no exception occurs, the plug-in writes no markup. To escape characters, use the escape parameter.

Parent The list-rendering context