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I am deeply confused now by the name "openjdk." I thought openjdk was the open source version, but it seems like it's just an adjective according to this articl

I am deeply confused now by the name "openjdk." I thought openjdk was the open source version, but it seems like it's just an adjective according to this article. IceTea is one OpenJDK JDK? Azul is another? Does IBM still maintain a JVM and will that be another? What the hell is this thing: https://hub.docker.com/_/openjdk https://hub.docker.com/_/openjdk Is that Oracle's OpenJDK release, which is different from Oracle Java? Or is this the IceTea release?

chrisseaton 8y ago
OpenJDK can be an upstream. You can build it as is or create your own derivative version. If someone creates a modified version they put their own name in front to clarify.
Nursie 8y ago
OpenJDK seems to effectively be a standard, or set of interfaces/classes that must be provided. Oracle's OpenJDK build is very similar to Oracle Java but comes without the support contract or the license fee. Amazon are apparently working on one tailored more to AWS, etc. (edit: didn't realise it was the literal upstream source - probably best to ignore my comment!)
- deleted 8y ago
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pron 8y ago
OpenJDK is the name of an open source implementation of Java. It started as an open sourcing of part of the codebase to Sun's JDK, and gradually more parts moved from the closed source portions to the open source ones (i.e. OpenJDK). Sometimes, some closed source, commercial features were added, but as of JDK 11, Oracle completed open sourcing the entire JDK -- that's OpenJDK. IBM still have their own VM, J9, and while they produces JDK builds that they misleadingly call OpenJDK, they are not. They replace the OpenJDK JVM (HotSpot) with theirs, but keep the standard libraries. So it's not OpenJDK, but it's a JDK that uses most of the OpenJDK standard libraries. Azul have two JDKs. They have the proprietary Zing, which uses their own VM (which, in turn, is a modification of HotSpot, which they licensed, with their own optimizing compiler and GC) and the OpenJDK libraries, and the open source Zulu, which is an OpenJDK build. I think IcedTea is also an OpenJDK build. > What the hell is this thing: https://hub.docker.com/_/openjdk https://hub.docker.com/_/openjdk Is that Oracle's OpenJDK release, which is different from Oracle Java? Or is this the IceTea release? Good question.

chrisseaton 8y ago

OpenJDK can be an upstream. You can build it as is or create your own derivative version. If someone creates a modified version they put their own name in front to clarify.

Nursie 8y ago

OpenJDK seems to effectively be a standard, or set of interfaces/classes that must be provided. Oracle's OpenJDK build is very similar to Oracle Java but comes without the support contract or the license fee. Amazon are apparently working on one tailored more to AWS, etc. (edit: didn't realise it was the literal upstream source - probably best to ignore my comment!)

deleted 8y ago
[deleted]

pron 8y ago

OpenJDK is the name of an open source implementation of Java. It started as an open sourcing of part of the codebase to Sun's JDK, and gradually more parts moved from the closed source portions to the open source ones (i.e. OpenJDK). Sometimes, some closed source, commercial features were added, but as of JDK 11, Oracle completed open sourcing the entire JDK -- that's OpenJDK. IBM still have their own VM, J9, and while they produces JDK builds that they misleadingly call OpenJDK, they are not. They replace the OpenJDK JVM (HotSpot) with theirs, but keep the standard libraries. So it's not OpenJDK, but it's a JDK that uses most of the OpenJDK standard libraries. Azul have two JDKs. They have the proprietary Zing, which uses their own VM (which, in turn, is a modification of HotSpot, which they licensed, with their own optimizing compiler and GC) and the OpenJDK libraries, and the open source Zulu, which is an OpenJDK build. I think IcedTea is also an OpenJDK build. > What the hell is this thing: https://hub.docker.com/_/openjdk https://hub.docker.com/_/openjdk Is that Oracle's OpenJDK release, which is different from Oracle Java? Or is this the IceTea release? Good question.