Migration from Oracle JDK to Open JDK

Let us first discuss the necessity of migration. Therefore, starting in January 2019, enterprises must purchase a commercial license (i.e. purchase from Oracle) to receive software upgrades, as Oracle announced in 2018, maintain Oracle Java, update to the latest patch level, and pay membership fees . You can get an idea of ​​the price by knowing that each server core requires licensing, which costs $25 per month.

Additionally, even if there is only one Java server in the cluster, if it is virtualized, the license fee will apply to all "cores" of the server.

Oracle JDK and Open JDK

prerequisites

Oracle has instituted membership fees for any latest version beyond Oracle Java JE 8 Patch 211 and JDK 11, and from a security vulnerability perspective does not want to keep versions at older, unsupported patch levels . Therefore, we have to decide whether we really need to install Oracle Java JE or JDK to run any application on the server.

For each server you have, select the appropriate option for each server.

• If you do not need Oracle Java, please uninstall it.

• If the open source version meets your needs, please choose to use the open source version again.

Existing implementation of Oracle JDK

Let’s first take a look at the highlights of the latest non-billable Java version supported by Oracle, Java 1.8.0.202 (64-bit).

• Licensing is the biggest difference between Open JDK and Oracle JDK. Open JDK has the GNU General Public License and is completely open source java. Oracle JDK requires a commercial license according to the Binary Oracle Code License Agreement.

• As of January 2019, organizations that want to obtain software updates must purchase a commercial license (from Oracle).

• In the past, Oracle JDK performed better than Open JDK. However, Open JDK performance is improving. And the Open JDK community's contributions often exceed those of Oracle JDK.

• This really comes down to support, as Open JDK shares 99.9% of its code with Oracle JDK (depending on which vendor you get it from).

Open JDK life cycle date and RHEL version

Support for open JDK versions is as follows -

• Open JDK 6 (1.6) 5.3 6.0 7.0 N/A, December 2016

• Open JDK 7 (1.7) 5.9 6.3 7.0 N/A June 2020

• Open JDK 8 (1.8) N/A 6.6 7.1 8.0 May 2026

• Open JDK 11 N/A N/A 7.6 8.0 October 2024

For production deployments of Open JDK on RHEL and Windows, the Service Level Agreement (SLA) and Coverage (SoC) are defined in the Production Support Scope and Production Support Service Terms respectively.

Release schedule

Oracle releases a version every three years, while Open JDK releases a version every six months.

license

Open JDK is licensed under the GNU General Public License (GNU GPL) version 2, with a linking exception, in contrast to the Oracle Binary Code License for Oracle JDK.

performance

Since the Oracle JDK build process is based on the Open JDK build process, there are no significant technical differences between the two. Oracle's performance is far superior in terms of responsiveness and JVM performance. Because it takes its business customers very seriously. It places more emphasis on stability. Open JDK, on ​​the other hand, will provide updates more frequently. Therefore, we may encounter instability issues.

Features

While comparing the features and settings, we can observe that Open JDK has font rendering features while Oracle product has flight logging, Java mission control and application class data sharing features. In addition, Oracle provides superior rendering and additional garbage collection options.

Development and Popularity

Unlike Open JDK, which is jointly created by Oracle, Open JDK, and the Java community, Oracle JDK is entirely developed by Oracle Corporation. But well-known companies such as Red Hat, Azul Systems, IBM, Apple INC. and SAP AG are also actively contributing to its development.

Cost-benefit analysis

Maintain Oracle Java, update to the latest patch levels, and pay membership fees. You can get an idea of ​​the price by understanding that each server core requires a license, which costs $25 per month. Additionally, even if there is only one Java server in the cluster, if it is virtualized, the license price will apply to all cores of the server.

Comparison between Oracle JDK and Open JDK

Features	ORACLE JDK	Open JDK
Long term support options	Java 8 until 2022 (Premium Support) and March 2025 (Extended Support) Java 11 until September 2023 (Premium Support) and September 2026 (Extended Support)	The support period of each version is one month, so if you want to use the supported Java version, you must update the JDK version
TCK COMPLIANCE	Meets the requirements	Meets the requirements
Free/Commercial Basics	Requires purchase of license. The number of licenses is based on the number of processors, cores and users using Java.	JDK is free. GNU General Public License V2 (with classpath exception) (GPLv2 CPE)
support	Oracle	Community
cost	USD 40.500 per year	free

in conclusion

After careful inspection, it is obvious that in the debate between Open JDK and Oracle JDK, Open JDK has a considerable advantage. Because Open JDK is an open source platform, Java developers are encouraged to contribute to further developing the platform. We end up witnessing a wealth of creative work and objects from several outstanding Java developers who use Open JDK and have been active contributors to Oracle JDK.

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