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would someone mind explaining, or linking to an explanation, of what bits of Java are open source, and which aren't? phrased another way, which bits are missin

would someone mind explaining, or linking to an explanation, of what bits of Java are open source, and which aren't? phrased another way, which bits are missing that prevent an individual from compiling and running Java programs on the JVM using open source software.

pjmlp 11y ago
- Some parts of tha JavaFX pipeline are different - ARM compilers are different - The Swing font engine used to be different - Tooling that many devs depend on, like the Mission Control - The AOT native compilers and tooling for embedded Java Not an exhaustive list.
needusername 11y ago
OpenJDK is fully open source. Oracle JDK is built on OpenJDK but changes a few things here and there. * Oracle JDK has a different font rasteriser, maybe some other bits like sound are different as well * Oracle JDK has Flight Recorder support (that's a commercial feature) * Oracle JDK supports both C1 and C2 JITs on ARM64, AFAIK an open source implementation of this is coming to OpenJDK 9, likely Oracle JDK will keep the existing implementation * Oracle JDK has additional commercial features like resource management [2] and application class data sharing OpenJDK vanilla is AFAIK not TCK-certified. However there are TCK-certified OpenJDK distributions [3]. TL;DR: OpenJDK is fully open source [1] https://docs.oracle.com/javacomponents/ https://docs.oracle.com/javacomponents/ [2] https://www.youtube.com/watch?v=0WZpmylHbFM&index=8&list=PLX8CzqL3ArzUo2dtMurvpUTAaujPMeuuU https://www.youtube.com/watch?v=0WZpmylHbFM&index=8&list=PLX... [3] https://www.azul.com/products/zulu/ https://www.azul.com/products/zulu/