HotswapAgent

Allows runtime changes like adding methods and fields beyond standard Java hotswap, using DCEVM for almost unlimited redefinition except superclass changes.

Preconfigured plugins for Spring, Hibernate, Tomcat, and others automatically reload framework configurations after code changes, reducing manual restarts.

Watches local classes and resources on the filesystem for changes and reloads them automatically, streamlining the development feedback loop.

Supports fatjar, core, and external modes to balance plugin availability and startup performance, with extraClasspath for watching JAR-internal changes.