Rollback can't be done after committing?

[Kouta Osabe]

Hi, all

I have a question about Solr and SolrJ's rollback.

I try to rollback like below

try{
server.addBean(dto);
server.commit;
}catch(Exception e){
 if (server != null) { server.rollback();}
}

I wonder if any Exception thrown, "rollback" process is run. so all
data would not be updated.

but once commited, rollback would not be well done.

rollback correctly will be done only when "commit" process will not?

Solr and SolrJ's rollback system is not the same as any RDB's rollback?