translate a set of strings to a json array , optionally preserving the empty array . otherwise default empty array is returned as null . concode_field_sep Gson gson concode_elem_sep Logger logger concode_field_sep Map readMap concode_elem_sep Date getAsDate concode_elem_sep List<EncryptionMethod> getAsEncryptionMethodList concode_elem_sep Set readSet concode_elem_sep String getAsString concode_elem_sep EncryptionMethod getAsJweEncryptionMethod concode_elem_sep Set<String> getAsStringSet concode_elem_sep List<JWEAlgorithm> getAsJweAlgorithmList concode_elem_sep void writeNullSafeArray concode_elem_sep Long getAsLong concode_elem_sep Boolean getAsBoolean concode_elem_sep JWSAlgorithm getAsJwsAlgorithm concode_elem_sep JWEAlgorithm getAsJweAlgorithm concode_elem_sep List<JWSAlgorithm> getAsJwsAlgorithmList concode_elem_sep List<String> getAsStringList