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thank you so much...i've added the initialitation, but now i've got new problem:

gagal di com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
Exception in thread...

i have this error :
Exception in thread "main" java.lang.NullPointerException
at aplikasiBarang.aplikasiBarang.tabelKosong(aplikasiBarang.java:531)
at...