What is the Rust equivalent to Java’s PrintWriter?

In Rust, the equivalent of Java’s PrintWriter is the std::io::Write trait, which is implemented by a number of types that can be used to write data to an output stream, such as a file or a network socket. To use Write to write text to an output stream, you can use the write_all method, which […]

Solving “Received fatal alert: handshake_failure” error when performing HTTPS connections on a custom made JRE with jlink

TL; Tell me already what to do: Add the jdk.crypto.cryptoki module to the list of –add-modules parameter to your jlink command invocation If you’re reading this you’re one of the few developers out there that wanted to distribute a java 9+ app (using either jdk 9, jdk 10, jdk 11 or jdk 12, as of […]

How to run your Kotlin gradle built app from the command line

So you build your Kotlin app, you went through the trouble of creating a build.gradle script that you build with gradle assemble this outputs a a “build/libs/kotlin.jar” .jar file, but you have no clue how to run your Kotlin code from the command line. Doing it by hand with “java -cp ” is too much […]

[CODE/JAVA] Scanner – read a full line

I was solving problems at HackerRank to teach a friend how to code in Java and to process the input data it’s convenient to use Java’s built in Scanner class. However, in one of the problems we wanted to read a whole line at once and we noticed that the Scanner’s API is geared towards […]

[CODE/JAVA] ARGB_8888 Pixel Abstraction

This is one of the ways you can decode Pixel colors out of the integers you get from Android Pixels. ARGB_8888, stands for Alpha, Reg, Green, Blue. The 8’s stand for the number of bits per channel. In Android, signed int‘s are used to represent pixel’s alpha/color information. Since Android’s language of choice is java, […]

IntelliJ / Adroid Studio / CLion / GoLand / PyCharm / PHPStorm keymap shortcuts I can’t live without

Download settings.jar (Import with `File -> Import Settings`) I got to IntelliJ after years of using Emacs and Eclipse. Here’s how my keymap looks now that I work with Jetbrains tools, these are the keyboard shortcuts I can’t live without as a programmer. Legend (Mac keyboard) ⌘ Command ⇧ Shift ⌘1 Show Intent Actions […]

2 Java debugging tricks

1. Embed state in your thread names. Some times when you see a crash log with a thread dump, you see the stack of all the threads at the moment of the snapshot, but there’s no way to see what the state of the variables and objects at play in the thread were like. You […]

GRADLE: How to specify resources from different folders on your sourceSet

Sometimes you need to have resources in your sourceset and these may come from different locations on disk, the official documentation is lacking in real world examples, or at least I just didn’t understand it very well, but from reading forums I finally got it to work. In the example I specify what files to […]

GRADLE: How to copy files from another .jar into your resulting output .jar

In our project we like to deliver a single jar as the final product, if you need to copy files that live on an existing jar into the Gradle’s output jar, this example shows you how to do that (and more) [pastacode lang=”java” manual=”jar%20%7B%0A%2F%2Fthis%20is%20how%20you%20change%20the%20name%20of%20the%20output%20jar%0AarchiveName%3D%E2%80%99frostwire.jar%E2%80%99%0A%0A%2F%2Fsome%20exclusion%20rules%20to%20keep%20your%20.jar%20clean%0Aexclude(%E2%80%98META-INF%2F*.SF%E2%80%99%2C%20%E2%80%98META-INF%2F*.DSA%E2%80%99%2C%20%E2%80%98META-INF%2F*.RSA%E2%80%99%2C%20%E2%80%98META-INF%2F*.MF%E2%80%99)%0A%0A%2F%2Fhere%20we%20grab%20all%20the%20.class%20files%20inside%20messages.jar%20and%20we%20put%20them%20in%20our%20resulting%20jar%0Afrom%20(zipTree(%E2%80%98lib%2Fjars%2Fmessages.jar%E2%80%99))%20%7B%0Ainclude%20%E2%80%98**%2F*.class%E2%80%99%0A%7D%0A%0A%2F%2Fhow%20to%20manipulate%20the%20jar%E2%80%99s%20manifest%0Amanifest%20%7B%0Aattributes%20%E2%80%98Main-Class%E2%80%99%3A%20%E2%80%98com.limegroup.gnutella.gui.Main%E2%80%99%0A%7D%0A%7D” message=”” highlight=”” provider=”manual”/]

GRADLE: How to add a list of local .jar files to the build classpath

Sometimes you don’t want/cant use maven repos, all you have is a bunch of local jars on disk that you want to use as part of your compilation classpath, and the freaking gradle documentation is too vague. Here is an example: [pastacode lang=”java” manual=”dependencies%20%7B%0Acompile%20files(%E2%80%98lib%2Fjars%2Fgettext-commons.jar%E2%80%99%2C%0A%E2%80%98lib%2Fjars%2Flucene-3.5.0.jar%E2%80%99%2C%0A%E2%80%98lib%2Fjaudiotagger.jar%E2%80%99%2C%0A%E2%80%98lib%2Fjars%2Fh2-1.3.164.jar%E2%80%99%2C%0A%E2%80%98lib%2Fjars%2Fmessages.jar%E2%80%99%2C%0A%E2%80%98lib%2Fjars%2Fslf4j-api-1.7.5.jar%E2%80%99%2C%0A%E2%80%98lib%2Fjars%2Fjaudiotagger.jar%E2%80%99%2C%0A%E2%80%98lib%2Fjars%2Fmetadata-extractor-2.6.2.jar%E2%80%99%0A)%0A%7D” message=”” highlight=”” provider=”manual”/]