Describe the enhancement requested

In the java-info implementation, when parsing AdjacentList or PropertyGroup, if the prefix field is missing, it is currently treated as null/empty, which can lead to issues later. Referring to the C++ logic, if prefix is empty, it is set to a reasonable default value (e.g., PropertyGroup uses concatenated property names, AdjacentList uses type name as the directory name. See the C++ reference implementation: graph_info.cc#L109). I have completed a simple demo for this logic (yangxk1@c84c162), but would like confirmation whether there are other locations in the codebase that should also add this kind of default value handling. Please review all AdjacentList and PropertyGroup related parsing/construction code to ensure consistent default prefix logic and to avoid missing cases.

Component(s)

Java