Problems training my own sentence splitter, with dictionary

[Riccardo Tasso]

I'm trying to use OpenNLP to train a sentence splitter model, following 
the manual, and everything is ok with it.

I've noticed that the train method supports a Dictionary of 
abbreviations, which tipically give me problems with my sentence 
splitter and I wanted to try this strategy.

1) If I train a sentence splitter model passing a Dictionary I've build 
and I serialize it (just as I serialize a simpler model) I have problems 
in loading the model from file:

SentenceModel model = SentenceDetectorME.train(language, sampleStream, 
true, abbreviations, 5, 100);
modelOut = new BufferedOutputStream(new 
FileOutputStream("/home/lib/apache-opennlp-1.5.1-incubating/models/it/it-sent.bin"));
model.serialize(modelOut);
[...]
modelIn = new 
FileInputStream("/home/lib/apache-opennlp-1.5.1-incubating/models/it/it-sent.bin");
final SentenceModel sentenceModel = new SentenceModel(modelIn);

i. e. the last instruction gives me the following exception:
java.io.IOException: Stream closed
    at java.util.zip.ZipInputStream.ensureOpen(ZipInputStream.java:61)
    at java.util.zip.ZipInputStream.closeEntry(ZipInputStream.java:108)
    at opennlp.tools.util.model.BaseModel.<init>(BaseModel.java:137)
    at opennlp.tools.sentdetect.SentenceModel.<init>(SentenceModel.java:77)
    at SentenceDetector.main(SentenceDetector.java:18)

2) I tried to skip the serialization/de-serialization phase, to go on 
with my tests:
SentenceModel model = SentenceDetectorME.train(language, sampleStream, 
true, abbreviations, 5, 100);
String[] sentences = sentenceDetector.sentDetect(document);

However sentences are splitted also on abbreviations which I declared in 
my Dictionary, which isn't exactly what I expected. E.g. : "Sono Mr. 
Brown" is uncorrectly splitted in "Sono Mr." and "Brown.".

Can you help me with these two problems, which seems to be different, 
but may share the same issue.

Thanks,
    Riccardo