Questions tagged as 'java'

Tagged questions
0
answers

Problem when inserting data from a java application to a MYSQL database

I am trying to make a record from a java application but when I clicked the accept button it does not save the data in the DB (Mysql) I am using the IDE Eclipse here I leave the code where I do the registration. Connection con = null;...
asked by 24.11.2018 / 22:33
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What is the solution to all present, past and future NullPointerException errors?

I have my Java program and I get a NullPointerException and I have seen other questions but they are from people with other programs and it does not work for my program and I want to leave here the 2,000 lines of my program so that you solve the...
asked by 08.01.2017 / 18:54
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Error processing request when adding dependency maven jersey-core

I am in a project where I was requested several functionalities through REST services, most of the functionalities are already developed and working, however there is one that corresponds to receiving the sending of several files through multipa...
asked by 19.11.2018 / 06:52
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How to place line breaks in a jtextarea java?

I have a text editor in java: v in this you can open and save files by placing the path of the file plus the format ... but when you save a file the line breaks that you place are not saved here a part of my code when you precious the save butto...
asked by 25.11.2018 / 01:57
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Connect Java with mysql in IntelliJ idea

I'm trying to connect java with mysql and I get these exceptions. These are my classes: package com.javasdp.sdp; import java.sql.Connection; import java.sql.DriverManager; import java.sql.*; public class Database { private Connection co...
asked by 19.11.2018 / 05:00
6
answers

What is the solution to all present, past and future NullPointerException errors?

I have my Java program and I get a NullPointerException and I have seen other questions but they are from people with other programs and it does not work for my program and I want to leave here the 2,000 lines of my program so that you solve the...
asked by 08.01.2017 / 18:54
0
answers

Update a JTable within a cycle For

I have a problem when running a program. I am simulating a Processor with java and I am saving the variables in a list and showing them in a JTable, in this program I have a variable that is the one of cycles that must go in decrement every time...
asked by 17.11.2018 / 04:34
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Error saving image in an ImageView object with JavaFX and sceneBuilder

I'm making a simple graphical desktop application for image management and, I'm using JavaFX, in addition to its sceneBuilder. The idea is, by giving a button that a FileChooser appears, to choose the image and to show a new window with all the...
asked by 17.11.2018 / 16:21
1
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Where to host files in maven web project

I have a web project built with maven and eclipse that from a byte array I must write the files inside the project folders and then through a url the files can be downloaded. Looking for the files I could leave in the resources folder. In...
asked by 17.11.2018 / 05:38
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Pressing back does not return as expected

I run into the following problem: If I take a tour of my app and go through the layouts, when I click the button on the back of the mobile terminal, I see that it is not going backwards as I expect, but that it goes back on the path I have ma...
asked by 17.11.2018 / 09:17