For Java-based programs such as Maven, Jenkins, Gradle or Tomcat to run, they need to know that Java's JDK is installed. That's the purpose of the JAVA_HOME environment variable. It tells programs ...

Community driven content discussing all aspects of software development from DevOps to design patterns. The latest long-term support (LTS) release of the JDK is Java 21, which was released in ...

Every communication protocol should have a mechanism to determine whether the received data is valid. I once encountered a team that didn’t have such a mechanism. Their device operated in a ...

A basic feature of number theory, prime numbers are also a fundamental building block of computer science, from hashtables to cryptography. Everyone knows that a prime number is one that cannot be ...

To identify possible mistakes made during data entry or transmission, a checksum is a small piece of data extracted from the original data. It acts as a distinct fingerprint for data, making it ...

I'm running into an issue with the module system preventing access to a private method in CRC32 Exception in thread "main" java.lang.Error: Failed to acquire method handle for private static native ...

If you’ve just downloaded a file from the Internet, you may want to verify that the downloaded file hasn’t been tampered with. After all, who knows what kind of nefarious fiddling a hacker might have ...

Generating checksums—cryptographic hashes such as MD5 or SHA-256 functions for files is hardly anything new and one of the most efficient means to ascertain the integrity of a file, or to check if two ...

The technology is legendary, but how and why Sun Microsystems eventually settled on the name 'Java' was always something of a mystery—even to those involved. When Time magazine called Java one of the ...

We are often struck by how often we spend time trying to optimize something when we would be better off just picking a better algorithm. There is the old story about the mathematician Gauss who, when ...