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OpenJDK (Open Java Development Kit) is a free and open-source implementation of the Java Platform, Standard Edition (Java SE). [2] It is the result of an effort Sun Microsystems began in 2006, four years before the company was acquired by Oracle Corporation .
Binary compatible operating systems are OSes that aim to implement binary compatibility with another OS, or another variant of the same brand. This means that they are ABI-compatible (for application binary interface). As the job of an OS is to run programs, the instruction set architectures running the OSes have to be the same or compatible.
The Technology Compatibility Kit for a particular Java platform is called Java Compatibility Kit (JCK). It is an extensive test suite used by Oracle and licensees to ensure compatible implementations of the platform. The JCK for Java 6.0 source code has been released.
The platform uses the Java programming language and is part of the Java software-platform family. Java SE defines a range of general-purpose APIs—such as Java APIs for the Java Class Library—and also includes the Java Language Specification and the Java Virtual Machine Specification. [2] OpenJDK is the official reference implementation ...
The same version of the JVM can be used in OpenJDK 8 and later releases, which means that many features and improvements can be exploited by applications that run on different versions of Java. Compared to Oracle 's HotSpot VM, OpenJ9 touts higher start-up performance and lower memory consumption at a similar overall throughput.
In September 2016, Oracle detailed plans to add ahead-of-time compilation to the OpenJDK using the GraalVM compiler for Java SE 9. [15] [16] This proposal, tracked by JEP 295: Ahead-of-Time Compilation, was included in Java SE 9. [17] The experimental use of GraalVM as a just-in-time compiler was added for the Linux x64 platform for Java SE 10 ...
The IcedTea package in these distributions has been renamed to OpenJDK using the OpenJDK trademark notice. In June 2008, the Fedora build passed Sun's rigorous TCK testing [6] on x86 and x86-64. IcedTea 2, the first version based on OpenJDK 7, was released in October 2011. [7] IcedTea 3, the first version based on OpenJDK 8, was released in ...
The heart of the Java platform is the "virtual machine" that executes Java bytecode programs. This bytecode is the same no matter what hardware or operating system the program is running under. However, new versions, such as for Java 10 (and earlier), have made small changes, meaning the bytecode is in general only forward compatible.