1
Add detailed message to NullPointerException describing what is null
Improve the usability of NullPointerException s generated by the JVM by describing precisely which variable was null .
OpenJDK
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2
Java Virtual Threads Preview
Introduce virtual threads to the Java Platform. Virtual threads are lightweight threads that dramatically reduce the effort of writing, maintaining, and observing high-throughput concurrent applications. This is a preview API .
3
JEP 295: Ahead-of-Time Compilation
Improve the start-up time of both small and large Java applications, with at most a limited impact on peak performance.
4
Java record pattern matching in JDK 19
Enhance the Java programming language with record patterns to deconstruct record values. Record patterns and type patterns can be nested to enable a powerful, declarative, and composable form of data navigation and processing. This is a preview language feature .
5
State of Valhalla
This is the first of three documents describing the current State of Valhalla. The second is The Language Model ; the third is The JVM Model .
6
JEP 286: Local-Variable Type Inference
Enhance the Java Language to extend type inference to declarations of local variables with initializers.
7
Java 9: The State of the Module System
This document is slightly out of date. None of the fundamental concepts has changed but the requires public directive has been renamed to requires transitive , and several additional capabilities have been added. An update is in preparation and will be posted here when ready.
8
Flight Recorder becomes part of OpenJDK
Provide a low-overhead data collection framework for troubleshooting Java applications and the HotSpot JVM.
9
JEP 325: Switch Expressions
Extend the switch statement so that it can be used as either a statement or an expression, and that both forms can use either a "traditional" or "simplified" scoping and control flow behavior. These changes will simplify everyday coding, and also prepare the way for the use of pattern matching (JEP 305) in switch …
10
JEP 335: Deprecate the Nashorn JavaScript Engine
Deprecate the Nashorn JavaScript script engine and APIs, and the jjs tool, with the intent to remove them in a future release.
11
Project Panama: Interconnecting JVM and Native Code
We are improving and enriching the connections between the Java virtual machine and well-defined but “foreign” (non-Java) APIs, including many interfaces commonly used by C programmers.