The "field sorter" work-around doesn't work for classes outside the sources input/output directory.

[nmihajlovski]

The "field sorter" work-around needs to find the Java source files, to be able to read the field order from there.
So far, the generated sources folder was configured to be the same as the originating sources folder (e.g. "src/main/java" or "src") and it was used to search the Java source file for the model. But if the model class is in other package (e.g. "src/test/java", the field sorter searches for the model Java file in the configured output folder (e.g. "src/main/java"), so it cannot find it.

Thus, to support additional source folders, the annotation processor needs additional configuration, e.g. path="src/test/java".
When such feature is implemented, it will give flexibility to specify more source paths, e.g. path="src/main/java:src/test/java", giving additional flexibility to specify any input folders for the "model" sources and any output folder for the generated sources.