Questions tagged as 'java'

Tagged questions
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List by foreign key MySQL and Java

I'm trying to select the dvds that the member registered but I'm not getting it, I would like to know if someone can help me, the result of my code returns so Result: 1 - null - null - null - null - null - null - 2 And only one result appea...
asked by 31.05.2015 / 00:41
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Read Console String in Java

I need to know how to get Strings being printed on the console to do some sort of processing on them.     
asked by 17.10.2017 / 13:59
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Search in JTable does not return as expected

I have a bug that I do not understand. The idea is simple, I should type a value in a field and it returns me in the table, this happens, however when I click on the value found in the search it selects me the first value inside the table impo...
asked by 13.09.2017 / 04:03
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Return null for method type ListString

I have a method with return type List<String> , when doing a query I can return a value or nothing: public class Repositorio { @PersistenceContext private EntityManager em; public List<String> listaEscritor...
asked by 02.08.2018 / 21:19
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How to determine the size of a JTextField?

I'm doing a program involving Pythagorean theorem, and wanted to leave a triangle in the middle, with three JTextFields around all three sides of it. I did this, but the problem is that when I create the JTextField and add it to the desired Cont...
asked by 20.07.2014 / 12:36
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How to hide a div when it is empty? [closed]

How do I do it? Note: I have seen an example using thymeleaf but it does not work, that is, the namespace does not recognize the project. Someone there to help?     
asked by 24.04.2016 / 07:15
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Monitor if REST services are online

Does anyone know what an interesting tool to monitor if the services are online or not?     
asked by 29.03.2016 / 05:49
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Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: [Ljava.lang.Object; can not be cast to [Lbr.com.jcom.modelo.Marca;

I have the following error: Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to [Lbr.com.jcom.modelo.Marca; at br.com.jcom.dao.MarcaDao.insert(MarcaDao.java:1) at br.com.jcom.facad...
asked by 16.02.2015 / 21:51
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Create a site with JAVA programming? [closed]

I would like to know how I could start to create a simple website through JAVA programming. If anyone can help or indicate some tutorial, thank you very much! Thanks     
asked by 26.02.2015 / 14:01
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How to sum the values of each row in an array?

How to sum the values of each row of an array and store the sum in an array ? Example: 3 3 3 2 3 4 2 2 2 Results in: 9 9 6     
asked by 20.04.2015 / 21:02