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Tag: java

Why JAR Files Do Not Contain Documentation?

I’m in the process of writing a small Java library that contains a related code that I usually include in most of my android app. I decided to export the library as a jar file then drop the file in the libs folder of my future projects. Using Android Studio: I created a Java Library module and put my co…

How to send email with inline image using ThymeLeaf

I’m trying to send an email with an inline image using ThymeLeaf and Spring, but so far no success. The email sends, but the inline image won’t show in the email. The project is not web-based (not a website), but is a desktop stand-alone, not mobile This is how I get the image file: My service cla…

Integer parameters formula returns integer

Code below makes foo value as -1149239296 i. e. integer value which is out of bounds: Seems like Java takes type of first parameter and tryes to return formula’s result with that type. Where in Java specification one can read that story? I made such suggestion cause actually returns sets long value to f…

GridBagLayout gridwidth doesn’t work as expected

I’m working with the java swing LayoutManager GridBagLayout, and ran into this problem. I want a layout like this ACC BB But get a layout like this ACC B A and B take up the same number of columns despite B having a gridwidth of 2 where A’s gridwidth is 1. I don’t think there can be a vanish…

How you create confirmation link for email?

In my project I need to send letter to user email with confirmation link. My solution: Add string column “code” and boolean column “is_active” (with default value false) to user table. When user register, generate unique string key and save to database. Send to email link, for example …

Convert a Julian Date to an Instant

I’m running into a situation where I would like to convert from a Julian date to an java.time.Instant (if that makes sense), or some Java time that can be more easily understood. My understanding of what a Julian date is comes from reading the Wikipedia page. There are bunch of different variants, and t…

Guava Resources.readLines() for Zip/Gzip files

I’ve found the Resources.readLines() and Files.readLines() to be helpfull in simplifiying my code. The problem is that I often read gzip-compressed txt-files or txt-files in zip archives from URL’s (HTTP and FTP). Is there a way to use Guava’s methods to read from these URL’s too? Or i…

How do I load a texture in LWJGL from a PNG without Slick?

I’m wondering how I would render a cube with a different PNG Texture on each side, and I’d like to stay away from other Third-Party Libraries other than LWJGL. Answer As of LWJGL3 bindings for the STB library have been included. This is a small single-file utility library that does things like loa…

Translucent blurred background in JavaFx

I want blurred translucent background effect in my JavaFx app like in the following image. But I cannot find any satisfactory answer anywhere. This answer provides some workaround, it takes screenshot of background and sets it as background image. But the problem is, if background changes, it remain as it is.…