We should emphasize that OpenJDK is an official reference implementation of a Java Standard Edition since version SE 7.
Note: the versions in italics are no longer supported. Let's take a look at the Java SE history: Oracle strongly recommends using the term JDK to refer to the Java SE (Standard Edition) Development Kit (there are also Enterprise Edition and Micro Edition platforms). It's thus named because it contains more tools than the standalone JRE, as well as the other components needed for developing Java applications. It contains a complete Java Runtime Environment, a so-called private runtime.
Openjdk vs oracle jdk software#
8 Appendix 8.1 Table of Abbreviations AbbreviationĨ.2 Glossary 8.JDK (Java Development Kit) is a software development environment used in Java platform programming. Other than the license, I could not find any significant differences between OpenJDK 12 and Oracle JDK 12. The announcement that OpenJDK and Oracle JDK are converging turns out to be true. For example, some classes might have symbols which are present in only one of the JDKs and not the other. There might be differences which are one level deeper than the level that I've analyzed so far. jdk.jdeps ( man1/javap.1, man1/jdeprscan.1, man1/jdeps.1).jdk.jartool ( man1/jar.1, man1/jarsigner.1).jdk.compiler ( man1/javac.1, man1/serialver.1).jdk.accessibility ( man1/jaccessinspector.1, man1/jaccesswalker.1).java.rmi ( man1/rmid.1, man1/rmiregistry.1).java.base ( man1/java.1, man1/keytool.1).Some modules contain man pages, which are only present in Oracle JDK 12: Without verification, I would assume that these classes, especially, are related to verifying the subscription for the Oracle JDK. The java.base module of Oracle JDK 12 contains a few classes which are not part of OpenJDK 12: Listing 6-1: Comparing the modules of OpenJDK 12 and Oracle JDK 12 6.1 Modules with different classes: java.base for i in openjdk-12/jmods/*.jmod do mod=$(basename $i) echo $mod diff -I 'legal.*' <(jar tf openjdk-12/jmods/$mod | sort) <(jar tf oracle-jdk-12/jmods/$mod | sort) echo done The modules themselves are almost identical.
OpenJDK 12 and Oracle JDK 12 contain exactly the same list of modules. The header files in OpenJDK are GPL2, the header files in Oracle JDK refer to the proprietary license.
Openjdk vs oracle jdk license#
The header files differ in the license terms. The technical contents of the header files in the include/ directory are identical. The legal files differ, obviously, because of the different license terms and conditions. That's weird, and this must be a bug in OpenJDK.
Listing 2-1: Comparing the release files of OpenJDK 12 and Oracle JDK 12 3 Man Pages This can be seen by looking at the differences between the two implementation's release files: diff openjdk-12/release oracle-jdk-12/release The OpenJDK 12 and Oracle JDK 12 are based on the same commit b67884871b5f in Mercurial. The downloads for OpenJDK 12 and Oracle JDK 12 can be found at and. 6.1 Modules with different classes: java.baseįigure -1: Comparing the file trees of OpenJDK 12 and Oracle JDK 12 1 Downloads.Author: Christian Hujer, Software Crafter and CEO / CTO of Nelkinda Software Craft Private Limited First Published: by Nelkinda Software Craft Private Limited Last Modified: by Christian Hujer Approximate reading time: 3 minutes Table of Contents TL DR: There is no relevant difference other than the license.
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