Questions tagged as 'java'

Tagged questions
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CSF blocking external connection

Oops, everybody! When I try a simple openConnection (code below has been simplified to demonstrate): URL url = new URL("url aqui"); url.openConnection(); I get the error: java.lang.RuntimeException: java.net.ConnectException: Connection r...
asked by 27.11.2018 / 00:19
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How to display list of servlet in jsp?

Good evening. Guys, I have a question which after N attempts does not clear up, so I decided to ask the masters for help. Basically, I have the following servlet: @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp)...
asked by 17.11.2018 / 00:08
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Java Process.getInputStream () is not reading accented characters

I want to run a python script using the Process class and display its output. However Java is printing the characters accented like a diamond with a question mark inside. ProcessBuilder processBuilder = new ProcessBuilder(command.split(...
asked by 17.11.2018 / 02:36
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Image Inclusion in Database - LongBlob

I am coding a simple register, where it needs to also record in the database a photo, which should be from the tibo BLOB. This is my Person Class: public class Pessoa { private Integer idPessoa; private String nome; private Dat...
asked by 17.11.2018 / 16:01
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How to compare Strings in Java?

The == operator says that the Strings are different, and they store the same literal value, see example: public class TesteString { public static void main(String[] args) { String str1 = "teste"; String str2 = "Otes...
asked by 03.02.2014 / 16:19
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Refactor the code using JAX-RS

I'm starting in the programming world and have to refactor a routine using another library. The routine uses the apache lib to do Http requests org.apache.http.* , I have to refactor using Jax-RS. Here is the example of the routine I ha...
asked by 21.11.2018 / 15:38
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Error in database insertion using JDBC

So guys, I'm trying to insert into a table (My database is using 3 tables), and for some reason in the stores_products table the insert is not performed. Here is the error:    t com.mysql.cj.jdbc.exceptions.SQLError.createSQLException (SQLErr...
asked by 14.11.2018 / 22:28
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Wildfly with postgresql, does not access the last database

I am setting up a datasource in Wildfly and when hibernate will create the tables, it is creating in the postgres database instead of the last database. Below is part of XML: <datasource jndi-name="java:/Teste" pool-name="Teste" enabled="tr...
asked by 21.11.2018 / 11:47
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How to arrange an array for odd numbers before even numbers?

I'm trying to make a program that arranges an array to put the odd numbers before the even numbers, this was my attempt, which I'm doing wrong. Code: System.out.print("Indique o número de elementos do array: "); int a = scanner.next...
asked by 13.11.2018 / 22:00
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Spring Data jpa save () method does not work, returning an object with id null

when testing the call in postman it returns the object as if it were saved but the id comes with value zero, follow my code below @Entity(name = "TB_CLIENTES") public class Cliente implements Serializable { private static final l...
asked by 13.11.2018 / 19:31