I am trying to learn SQL database with a tutorial. I add user and age to database and get them back and displayed using listView using ViewAll button then if
What are Null Pointer Exceptions (java.lang.NullPointerException) and what causes them? What methods/tools can be used to determine the cause
I'm wondering if it's possible to get the pixels of an item of a recyclerView, let's say I have an horizontal recyclerView and all the items are the same size (
I have a pretty complex json string that I would like to deserialize into custom Java Pojo, but Im not so sure how to do it. Here is the json: { "A": {
I'm doing an app that blocks the access to another apps when you have used them for an specific time, for example Facebook. So, my idea is to show a screen when
I have simple definition of my entities, but what i do wrong, because i can not get any entity UserInfo and receive only error (could not load an entity: [UserI
I am doing an exercise in a book where you have to test event handling. I have a JList with 3 font choices (Serif, SansSerif, and Monospaced) and two checkboxe
I am using JMeter to generate random number for load test Q) How to encode the long value below "DI"? The original value is 200. 7|0|8|http://10.6.3.1:90/portal
I have 2D ArrayList consisting of Objects, i pass it to a function in another class, like this: public void function(ArrayList<ArrayList<Object>>)..
I'm using java based configuration, using only @Component and @Scheduler Annotation in my other classes, but I don't know why all classes in class path loaded t
I have an api that gives me this json array. How do i just get specific key value pairs for traceId? these are traces generated by zipkin but i want to store th
I am meant to create a game in Java that specifically uses looping Arraylists to create a 4x4 grid. I have a Grid class, made up of an ArrayList of 4 Rows, a Ro
I have a KML File and I need convert to GeoJSON. I am using Geotools in Java for convert KML because GeoServer has problems to import KML. I can convert the fil
This is the Maven shaded plugin I'm using in my pom.xml: <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>mav
I am trying to update my account balance. I have a getAccountBalance accessor in my Account class in the same file as my main method, my main method has the Acc
Hello everyone My task is to simply make controller that gives me results immediately when they are ready (simple example below) Imagine: I want to get the exac
Basically I have the system where there is entity called Dictionary, where all dictionary entries are stored (like countries in example below), these entries ar
I know that we can pass a class in a param which has a particular class as its super. For example, see this: public void sampleMethod(Class<? super MyParentC
In Java, I want to use the class javax.imageio.ImageIO to read a image from an InputStream. This class has a static method, read(InputStream input), which can d
I have lot of beans declared in a single class package com.example; @Configuration public class MainBeanClass{ @Override @Bean("cachingSession") @Lazy public C