Many ops in the old imagej-ops framework, such as this one or this one attempt to log errors or warnings. Sometimes this is in place of throwing some RuntimeException (as in the case of the former) or other times it is just saying something about the data (as in the case of the latter). We need to find a consistent way to deal with the situations in which we would like to pass on messages/errors.

Regardless of the option, no messages should be allowed as secondary outputs.

Potential solutions:

• Use Scijava's Logger
• Create dedicated error subclasses (although this will only solve the issues with errors, not with the logging)
• Not allow any sort of logging