The plan also calls for aligning the ability to load agents dynamically with other so-called “superpower” capabilities such as deep reflection. Other goals of the proposal include reassessing the balance between serviceability, which involves ad hoc changes to running code, and integrity, which assumes running code is not arbitrarily changed, and ensuring that the majority of tools, which do not need to load agents dynamically, are unaffected. These warnings are intended to prepare for a future release that disallows the dynamic loading of agents by default, in order to improve integrity by default. A proposal to prepare to disallow the dynamic loading of agents calls for issuing warnings when agents are loaded dynamically into a running JVM.Goals of the plan include ease of use, comprehensibility, robustness, and performance. A scoped value allows data to be safely shared between components in a large program without resorting to method arguments. Thread-local variables have design flaws including unconstrained mutability, unbounded lifetime, and expensive inheritance. They are preferred to thread-local variables, particularly when using large numbers of virtual threads. Scoped values, also in preview, will enable the sharing of immutable data within and across threads. Goals of structured concurrency include promoting a style of concurrent programming that can eliminate common risks arising from cancellation and shutdown, such as thread leaks and cancellation delays, along with improving the observability of concurrent code. The only significant change this time around is that the StructuredTaskScope::Fork(…) method returns a rather than a Future. Structured concurrency previously was incubated in JDK 20 and JDK 19, released in March and September 2022 respectively it is to be featured as a preview API in the package. This streamlines error handling and cancellation, improving reliability and enhancing observability. Structured concurrency, in a preview stage, simplifies concurrent programming via an API for structured concurrency, treating groups of related tasks running in different threads as a single unit of work.
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