Questions tagged as 'java'

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Message does not appear in the taskbar java

My question is how can I get a msg from the taskbar by calling my method MessageTrayIcon () from another class? I mean, I call it but I do not do any action, msj does not appear in my taskbar, I have a Timer that fires every X seconds, msj sho...
asked by 14.09.2017 / 03:25
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Obtain age based on date in bbdd

Dear, I want to save a date of birth from form with jsp, then save it in bbdd mysql and then get it from the bbdd and calculate the age. Any idea how to achieve it? Greetings. <form action="cPaciente" method="post"> <label style="colo...
asked by 13.09.2017 / 21:22
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java Gui is blocked, serial communication - graphic jfreechart

I have a problem with the GUI that freezes, in my application I use the library rxtx 2.1-7 and the library jfreechart 1.0.19. Basically communication is established and port events are read when receiving data. the data is added to a list and th...
asked by 27.09.2017 / 18:56
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ERROR android studio java.lang.NullPointerException

Attachment LOGCAT:    09-13 17: 16: 41.571 5041-5041 / com.example.usuario.guiach   E / AndroidRuntime: FATAL EXCEPTION: main                                                                             Process: com.example.usuario.guiach, PID...
asked by 13.09.2017 / 21:32
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listview access to sub-element popedad

Good morning I would like to know if there is a way to access the elements of an element of a specific list Let me explain ... I have a personal list consisting of elements of images and text 'and I would like to know if there is a way to mak...
asked by 27.09.2017 / 18:31
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Greedy programming technique Count amount of coins

I have a difficulty, I am not able to make the list of used coins with which I arrive at the amount to be paid. This is what they are asking to do: Write an algorithm that allows the entry of a whole number of coins, where (1
asked by 25.09.2017 / 10:56
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JButton to connect to a BD

JButton Conectar = new JButton("Conectar"); in my main class. I would like that button to execute another class that I have in the package. SaveDB inside contains the Connection method. I tried this but it does not work. GuardarDB d...
asked by 25.09.2017 / 02:49
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Move data between classes

Hello to all good afternoon, I would like to help me know how I can develop my idea. I have some lists in a class I did to make the connection to a database. which is the following: package pkgfinal; import java.sql.*; import java.util.LinkedL...
asked by 12.09.2017 / 18:11
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Mybatis, referencing a class from another project in the Mapper.xml

Good morning, I am using MyBatis and I am having a ClassNotFound error in a resultMap in which I have a class from another project referenced. I attach code below: - Mapper.xml : Here I will only place the resultMap, which is where I am ha...
asked by 20.09.2017 / 08:19
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Null Pointer Exception when loading a JTextField

I have my Auto class public class Auto { int id_auto; String modelo; String color; int anio; String marca; public int getId_auto() { return id_auto; } public String getModelo() { return modelo...
asked by 19.09.2017 / 23:20