Java: Runtime

He pulled up jstat . He saw the GC pauses—hundreds of milliseconds, then seconds. The application was gasping. Jera investigated. It traced the references.

The Heap was filling with ghosts. Jera called upon its most feared servant: the Garbage Collector (GC) . java runtime

Then the lights went out.

But Jera watched a problem growing in the Heap. A developer upstairs had forgotten to close a FileInputStream . The object, still referenced by a lingering static variable in a ReportGenerator class, refused to die. It sat in the Tenured space—the old generation—like a corpse that wouldn’t rot. More joined it. BufferedImage objects from a report service. ArrayList instances bloated with stale transaction logs. He pulled up jstat

Jera opened its eyes a second time.

And so Jera began. Jera spawned its first child: Thread-0 , the Main thread. Thread-0 was brave, reckless, and full of purpose. It grabbed the main method from the Metaspace, pushed its stack frame onto the call stack, and started executing. Jera investigated

A new thread spawned. . Then Thread-2 . Then Thread-42 .