Core Java
-
How to Add Values to an ArrayList Used as a Value in a HashMap in Java
Java collections provide flexible ways to organize and group data. In some scenarios, a single key may need to be…
Read More » -
JFR in 2026 Is Not the”Black Box” You Remember— JEP 509 and Continuous Profiling
JFR has been called the most underrated component of the JVM for years. JDK 25 changed its role: real CPU-time…
Read More » -
Gradle 9’s Configuration Cache at Scale: Why Your 200-Module Enterprise Build Is Still Slow
You turned it on. You saw the warnings. You read the docs. The cache still misses. Here’s the real taxonomy…
Read More » -
Java Cannot Instantiate Type Error: Causes and Fixes
In Java, developers occasionally encounter the compilation error Cannot instantiate the type. This error occurs when a program attempts to…
Read More » -
Java Currency Symbol Matching
Working with international monetary values often requires applications to both recognize currency symbols in text and display properly formatted currency…
Read More » -
Java PreparedStatement with LIKE Wildcards Example
Searching text using SQL’s LIKE operator is a common requirement in many applications. When working with JDBC, developers typically use…
Read More » -
Project Leyden’s AOT Code Cache: How Java Is Solving Its Cold-Start Problem Without GraalVM
Leyden delivered its first three features in Java 24 and 25. A fourth lands in JDK 26. Here’s why this…
Read More » -
Type Classes Are Coming to Java. What the Valhalla Prototype Actually Means
In late 2025, a quiet but consequential prototype landed in the Valhalla repository. If it ever ships, the way Java…
Read More » -
The JVM Project No One Is Talking About —That Will Change Everything
Project Babylon is building a code reflection API that lets the JVM understand computation semantics, not just execute them. The…
Read More »
