Thanks for providing me with the links for the source. I had some minor difficulty compiling the source due to the import statements. Once I made them refer to the released(1.5.3) opennlp.tools jars, I was able to build with no errors. Hope those changes should be fine.
On the question of data set, I don't have any.
I have some test cases. I wanted to use coreference component to test whether I can start using them further in my other projects. That is how I began. As I see from your observations, a more thorough testing is needed and probably some modifications may also be due.
Last few days I have been trying to understand the code (probably the theory behind it). Made little progress.
Can you point me to some reference to works/paper on conference that this implementation is based on?
On the data side, when you refer to OntoNotes, do you mean the data available at