Posts by Cesar Voginski • 26 points

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  A: problem with java.lang.Nullpointerexception

  In the class documentoDAO in the method SelectFull you use the reference con on the line Preparedstatement stmt = con.prepareStatement(sql); But this con is only filled when you call the method…

  java nullpointerexception

  answered 8 years ago Cesar Voginski 26

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  A: Problems when adding numbers to an Arraylist

  You are creating a random without seed, and always creates a new Random() soon, it will always generate the same number Place new Random(System.nanoTime()) This way he is taking the nanoseconds in…

  java javafx arraylist

  answered 8 years ago Cesar Voginski 26