The Convergence of OpenJDK and the Oracle JDK

|
In 2018, Oracle changed the license of their JDK. Instead of a single JDK build available both for commercial and free users, they offered two different JDK builds:
            • Oracle JDK (commercial), which can be used in development and testing for free, but you have pay to use it in production.
            • Oracle Open JDK (open source), which can be used in any environment for free.

JDK Builds

  • There is only one set of source code for the JDK. It is hosted in Mercurial at OpenJDK.
  • Anyone can take the source code, produce a build, and post it. So, Oracle created a certification process that should be used to ensure the build is valid.
  • This certification is run by the Java Community Process, which provides a Technology Compatibility Kit (TCK or JCK as Java). If an organization produces an OpenJDK build that passes the TCK then that build can be described as "Java SE compatible".
  • The most popular and famous builds are distributed by Red Hat, Azul and community-led Adopt OpenJDK.

Oracle Commercial JDK

  • If you want to use Oracle JDK in production environment you have to pay for a license.
  • You can still use Oracle JDK for free in development and testing environments.
  • LTS Options: If you are using Oracle Java 9 or 10 you should change your JDK vendor, because Oracle will no longer support these versions even on a commercial basis.

RedHat Open JDK

  • Red Hat OpenJDK 8 (Open Java Development Kit) is a free and open source implementation of the Java Platform, Standard Edition (Java SE).
  • The RedHat OpenJDK build is free to use within a Red Hat Enterprise Linux (RHEL) which is paid for licences.
  • Red Hat was acquired by IBM in 2018 what provided them with a greater level of scale, resources, and capabilities.
  • LTS options: Major LTS OpenJDK versions (7, 8,  and 11) on RHEL are fully supported by Red Hat and Red Hat is committed to providing code-level patches for bug fixes. Major versions are supported for at least 6 years. For instance, OpenJDK 1.8 is supported until June 2023.

Oracle OpenJDK

  • Vanilla version JDK which is supported by Oracle engineers and the community. They usually get the newest features first.
  • Oracle OpenJDK is free to use in all environments including production.
  • LTS options: No LTS, there is a 6-month support cycle for each version, then you have to update JDK if you want to use a supported version of Java. It can cause security risks due to constant updates and unstable GDK.

References

Yorumlar

Yorum Gönder

Popular

Java 14 New Features

|
Java SE 14 was released in March 2020. The full list of new features in JDK 14 can be found here: https://openjdk.org/projects/jdk/14/   In this tutorial, we will look over some of these new features and examine some of them. 1. JEP 305: Pattern Matching for instanceof (Preview) With this JEP, instanceof now allows casting of the checked object to a variable. Before Java 14: if (obj instanceof String) { String s = (String) obj; // use s } With Java 14: if (obj instanceof String s) { // can use s here } else { // can't use s here } 2. JEP 345: NUMA-Aware Memory Allocation for G1 This JEP i mproves G1 performance on large machines by implementing NUMA-aware( non-uniform memory access ) memory allocation. Use the  +XX:+UseNUMA option to enable it. 3. JEP 358: Helpful NullPointerExceptions This JEP  improves the usability of  NullPointerException  generated by the JVM by describing precisely which variable was  null . Let's look over the follo...
Devamı

HTTP/2

|
Http is an application layer protocol designed for client-server communication and can be made analogy as a kind of mail service simply with the following features: Request line; identifies the resource called. Http header ; contains operating information about the message such as destination, content type and etc. in the form of key-value pairs. Payload or body; is the part that the actual message is contained. HTTP protocol is comprised of commands/verbs such as GET, POST, PUT.. GET https://www.google.com/ HTTP/1.1 Host: www.google.com Connection: keep-alive Cache-Control: max-age=0 Upgrade-Insecure-Requests: 1 User-Agent: Mozilla/5.0 (Windows NT 6.3; Win64; x64) Chrome/71.0.3578.98 Safari/537.36 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8 Accept-Encoding: gzip, deflate, br Accept-Language: tr-TR,tr;q=0.9,en-US;q=0.8,en;q=0.7 Cookie: SID=awcwAWJ-Py1UHfnKSWSzREE01k4qY45amv6.. History of HTTP by Versions The initial versio...
Devamı

Pretenders, Contenders and Liars

|
Life is a way to the uncertainity. This is an exact fact. In this uncertain journey, we meet kinds of people of having different behaviours, and generally label them according to their behaviours. In this writing, i will try to write my understanding of three of these labels; pretenders, contenders and liars. Pretenders A pretender is a kind of people who pretends :) It does not do what it seems to do. It does what it does not seem to do. We frequently meet pretenders in our daily life. And if we catch a person pretending, then we feel that is not sincere. Okay, then here is a question sincerely to ask yourself; do you ever find yourself pretending ? Contenders A contender is a person who has a goal to reach and do not hesitate to fight for that goal. So a contender is sincere ? Absolutely yes, you may be completely opposite to a contender, but if you know that it's a contender, then you know that it's sincere in its behaviours. And sure it is, if you trus...
Devamı