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 ...

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 ...

Did you download a large file? Or do you have a file that you have a suspicion about? The best way to ensure the file comes from a verified source is by measuring its checksum. A checksum is almost ...