Migration to Open JDK from Oracle JDK

Let's start by talking about the need for migration. Accordingly, from January 2019, enterprises will have to buy commercial licenses (i.e,from Oracle) to obtain software upgrades, as oracle declared in the year 2018. maintain oracle java, update to the most recent patch level, and pay the membership fees. You may get a sense of the price by knowing that each server core needs to be licensed, and each core costs US $25 per month.

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

Oracle JDK and Open JDK

Pre-requisite

Oracle has instituted a membership cost for anything more recent than Oracle Java JE 8 patch 211 and JDK 11, and from the standpoint of security vulnerabilities, it is not desirable to retain the version at an earlier, non-supported patch level. As a result, we must decide if Oracle Java JE or JDK installation is actually required in order to run any of the applications on the server.

For each server that you own, choose the relevant option for each server.

• If Oracle Java is not required, uninstall it.

• opt to go with open-source versions again if it meets your needs.

Existing Implementation of Oracle JDK

Let's first go through with the highlights of the most recent non-billable Java Version, Java 1.8.0.202(64 bit), as supported by Oracle.

• Licensing is where Open JDK and Oracle JDK diverge the most. With a GNU, General Public License, Open JDK is a java that is entirely open source. According to the binary oracle code license agreement, oracle JDK needs a commercial license.

• Since January 2019, organizations who want to get software updates must buy a commercial license (from oracle).

• In the past, oracle JDK has performed better than open JDK. open JDK’s performance, nevertheless, is improving. And open JDK community’s contributions frequently outperform Oracle JDK.

• What this really comes down to is support because Open JDK shares 99.9% of code with Oracle JDK (depending on whose supplier you’re obtaining it from).

Open JDK Lifecycles Dates and RHEL Versions

Support for Open JDK Versions are 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 the production deployments of Open JDK on RHEL and windows, the service level agreement (SLA) and scope of coverage (SoC) are defined, respectively, in the production support scope of coverage and the production support terms of service.

Release Schedule

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

License

Open JDK is licensed under GNU General Public License (GNU GPL) version 2 with a linking exception, in contrast to oracle JDK’s oracle binary code license agreement.

Performance

Since the Oracle JDK construction process is based on the Open JDK build process, there are no significant technological differences between the two Oracle’s Performance is far superior in terms of responsiveness and JVM performance. Because it values its business clients so highly. It puts a greater emphasis on stability. Open JDK, on the other hand, will offer updates more often. As a result, we may have instability issues.

Features

When comparing features and settings, we can observe that Open JDK has the font render feature whereas the Oracle product has the Flight Recorded, Java Mission Control, and Application Class Data Sharing capabilities. Additionally, Oracle offers superior renders and additional garbage collection options.

Development and Popularity

Unlike Open JDK, which is created jointly by Oracle, Open JDK and the Java Community, Oracle JDK is entirely developed by Oracle Corporation. Nut prestigious businesses like Red Hat, Azul Systems, IBM, Apple INC., and SAP AG also actively contribute to its growth.

Cost benefit Analysis

Maintain Oracle Java, update to the most recent patch level, and pay the membership fees. You may get a sense of the price by knowing that each server core needs to be licensed, and each core costs US $25 per month. Additionally, even if there is only one Java server in the cluster, the license price would apply to all cores of the server if it were virtualized.

Comparison between Oracle JDK and Open JDK

FEATURES	ORACLE JDK	OPEN JDK
Long-term support options	Java 8 till 2022 (Premier support) and March 2025 (Extended support) Java 11 till September 2023 (Premier support) and September 2026 (Extended support)	Month support cycle of each version, then you have to update JDK version if you want to use a supported version of Java
TCK Compliance	Compliant	Compliant
Free/Commercial Basis	Need to purchase a 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 the classpath exception (GPLv2+CPE)
Support	Oracle	Community
Cost	USD 40.500 per year	Free

Conclusion

After careful examination, it is clear that in the argument between Open JDK and Oracle JDK, Open JDK holds a sizable advantage. Since Open JDK is an open-source platform, java developers are encouraged to contribute to furthering the platform’s development. We’ll ultimately witness the wealth of creative work and objects done by several outstanding Java developers who used Open JDK and were formerly active contributors to Oracle JDK.