从 Oracle JDK 迁移到 OpenJDK

Question

我正在将我的 Java 应用程序从 Oracle JDK 迁移到 AdaptOpenJdk。那么迁移到 AdoptOpenJdk 需要进行哪些更改。

Answer 1

Feature parity

Oracle has committed to keeping their Oracle JDK product at feature parity with the codebase in the OpenJDK project. So any Java app running on Oracle JDK should run on any other platform built faithfully from the OpenJDK codebase. You need not make any changes to your Java programming.

Be aware that OpenJDK only provides source code. For binaries and installers, you must look elsewhere. Several companies provide such binaries and installers. One of those is a joint venture known as AdoptOpenJDK . Others include Azul Systems, Red Hat/IBM, SAP, BellSoft, Amazon, Oracle, and Pivotal.

Most of the vendors, including Oracle, provide JVMs using the HotSpot optimizing compiler and runtime. AdoptOpenJDK (at least) offers you a choice to obtain a build using the OpenJ9 optimizing runtime instead. Your Java app should run well on either HotSpot or OpenJ9, but you may see a different performance profile.

See my Answer to a similar Question.

Be aware that the current licensing terms for the Oracle JDK product require that for use in production you must pay a fee. That product is free-of-cost only for non-production use such as development and testing. If you do not want to pay such a fee to Oracle, use their unsupported product at JDK.java.net, or use a JVM provided by one of the other vendors as shown in this flowchart.