The Hidden Cost of Records: When Java’s Immutable Data Classes Quietly Hurt Your GC (opens in new tab)

Records are clean, expressive, and widely adopted — but in tight, allocation-heavy loops, they can pile invisible pressure on the garbage collector. Here’s what the profiler actually shows. When JEP 395 landed in Java 16, developers finally had a concise, built-in way to declare immutable data carriers. In one tidy declaration you get a canonical constructor, accessor …