OpenJDK 8未包含JavaFX？基于迁移需求的编译兼容问题咨询

解决方案 #

Got it, let's walk through the practical ways to compile your JavaFX app with OpenJDK 8 while keeping compatibility with JRE 8:

1. Reuse JavaFX libraries from your old Oracle JDK 8 #

Since you previously used Oracle JDK 8 (which bundles JavaFX), you can extract those libraries and use them alongside OpenJDK 8 for compilation:

• Locate the JavaFX JARs in your Oracle JDK 8 installation. They're usually in [OracleJDK8]/jre/lib/ext (look for jfxrt.jar and other related JARs) or [OracleJDK8]/jre/lib under the javafx subdirectories.
• Copy these JARs to a dedicated folder in your project (like lib/javafx).
• Compile your code with the classpath pointing to these JARs. For example:

  javac -cp "lib/javafx/*:src/" com/yourcompany/YourMainApp.java
  

• When distributing, make sure to include these JARs with your app if the target JRE 8 doesn't have JavaFX pre-installed (like OpenJRE 8).

2. Use a third-party OpenJDK 8 distribution bundled with JavaFX #

Several vendors maintain OpenJDK 8 builds that include JavaFX, which lets you avoid manually handling JARs:

• Distributions like Azul Zulu FX offer OpenJDK 8 builds with JavaFX pre-bundled. Just download the appropriate version for your OS, set it as your JAVA_HOME, and compile/running your app exactly as you did with Oracle JDK 8.
• This is the most hassle-free option, especially for commercial projects, as it avoids any licensing concerns with Oracle's BCL-licensed JavaFX.

Important Notes #

• If you're targeting OpenJRE 8 (not Oracle JRE 8), you'll need to include the JavaFX JARs in your application's classpath regardless of which compilation method you choose—OpenJRE 8 doesn't include JavaFX by default.
• Avoid trying to use modern OpenJFX (11+) with OpenJDK 8; they're incompatible by design, as OpenJFX shifted to a modular system starting with Java 11.

内容的提问来源于stack exchange，提问作者Symbiose Studios