Scott Sellers is the co-founder and CEO of Azul, with 30 years of experience as an entrepreneur and executive in the technology industry. Businesses today run on Java. Nearly 30 years after its ...

java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.Object.hashCode ()' on a null object reference at j$.util.concurrent.ConcurrentHashMap.get (ConcurrentHashMap.java:0) ...

The command-line interface (CLI) is the inner world of software development. From the shell, we have direct access to all the operating system’s capabilities, and with that comes the power to compose ...

Fatal error: java.lang.NullPointerException at java.base/java.util.concurrent.ConcurrentHashMap.putVal(ConcurrentHashMap.java:1011) at java.base/java.util.concurrent ...

Java was created over 25 years ago, and it is still one of the most popular programming languages. In this article, I will present an overview of how Java has grown to today's complex system and why ...

Runtime errors occur when something goes wrong in the normal execution of a program. When severe enough, these errors abruptly terminate an application. To help programmers both anticipate and recover ...

In Thursday’s puzzle, “Java” was the answer to the clue “Programming language named for a drink named for an island.” By Alexis Benveniste This is Clued In, a column that will give you insight into ...

A colleague of mine recently ran into an issue that I have not run into myself, but found to be interesting and, in my opinion, worth blogging about here. During some distributed Java development, my ...