java - Do not read the file in the package .jar -


this code reads firmware upgrade file jar package , send post request device: 

closeablehttpclient client2 = httpclients.createdefault();  httppost post = new httppost("http://" + ip + "/moxa-cgi/uploadfirmwarefile.cgi");  inputstream stream = main.class.getresourceasstream("vport364a_v1_5.rom");  byte b[] = new byte[stream.available()];  stream.read(b);  multipartentitybuilder builder = multipartentitybuilder.create();  builder.addbinarybody("uploadfile", b, contenttype.application_octet_stream, "vport364a_v1_5.rom");  post.setentity(builder.build());  httpresponse response2 = client2.execute(post);

for unknown reasons, code stopped working execute jar package: firmware upgrade file send nulls. on line:

stream.read(b);

only nulls already. if run code in ide netbeans, works.why?


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