I have 3 maven projects, the parent, the middle, and the child project: Then I have 2 annotation processor dependencies. The parent project defines maven-compiler-plugin as a managed plugin and configures annotation processor 1 on the annotationProcessorPath. The middle project does likewise and configures an…
Garbage Collector not freeing “trash memory” as it should in an Android application
Hello! I’m a beginner Java and Android developer and I’ve been having trouble lately dealing with my app’s memory management. I will break this text into sections, in order to make it clearer and readable. A brief description of my app It’s a game that consists of several stages (level…
Sorting 3 Numbers from Least to Greatest
As part of a problem set I have to sort 3 numbers in ascending order. A simple enough task, but for some reason I’m not getting the expected result. Using arrays is not allowed. Below is my code; I’ve linked to my flowchart here. I cannot get the program to sort 3 numbers such as 5, 5, and -4. Whe…
How to get the BigDemical in SQLite?
I’m grabbing the data of the database. If integer I can use getInt, If String I can use getString. But BigDecimal I don’t know what to use… Please Help. Thanks in advance! Answer Use BigDecimal.valueOf(double val):
How do I use the character’s equals() method in Java?
As the String is an object, you need to use the string.equals(string) method to confirm that the two strings are equal. However, why do you use the == to check if two chars are equal, char1 == char2, rather than char1.equals(char2)? Answer Perhaps, this will help to understand the difference on == vs equals.
Using GraalVM to run Java in AWS Lambda
Is there any ability to use GraalVM to run Java in AWS Lambda functions? I read a lot articles about cold starts of Java applications with GraalVM AOT (ahead-of-time) compilation feature and decreasing duration of that and I’d like to try to use it in my AWS Lambda projects. Answer With the introduction…
org.openqa.selenium.WebDriverException: Timed out waiting for driver server to start. Build info: version: ‘unknown’, revision: ‘unknown’
While everything works on my machine, when I bring the project in which I’m working on my server, Selenium and Chromedriver won’t boot, causing the following exception Everything works like this: the user, for launching the crawler, is supposed to click a button. Then, with JavaScript, I make an A…
Void is not a functional interface
I am trying to subscribe observable like : It’s working fine but if I use method reference compiler gives error “void is not a functional iterface” Any one can explain little bit deep? As per me subscriber accept consumer functional interface, which doesn’t return anything but we can p…
Error “227 Entering Passive Mode”/”Connection refused” when downloading from local FTP server in Android emulator
I am trying to download a file from my local FileZilla Server with Java FTPSClient running in Android emulator. I’ve written this helpercode to download one File: I call this function like this: But I keep getting this error: I already tried to use enterLocalActivemode() instead of enterLocalPassivmode(…
Problems with Firestore connections executing threads
First of all, I would like to apologize if the title is misleading. English is not my native language and I wasn’t sure how to name this post. Now the question: I have an Activity that shows the …