default Collection<String> getSerializationAcceptlist() throws IOException {
    return SanctionedSerializables.loadClassNames(getSanctionedSerializablesURL());
  }
Returns a URL for loading a module's collection of sanctioned serializables.
geode-serialization/src/main/java/org/apache/geode/internal/serialization/filter/SanctionedSerializablesService.java