Java 21 not working, release was build with java 23

[einfachBlu]

I am using Java 21 and i cant use the latest 2025.x version as it seems to have java 23 required. When i change back to 2024.x it works with java 21.

Not working with java 21

jproVersion = 2025.3.1
javafxVersion = 24.0.2

Caused by: java.lang.UnsupportedClassVersionError: javafx/scene/Node has been compiled by a more recent version of the Java Runtime (class file version 67.0), this version of the Java Runtime only recognizes class file versions up to 65.0
	at java.base/java.lang.ClassLoader.defineClass1(Native Method)
	at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1027)
	at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150)
	at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:862)
	at java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(BuiltinClassLoader.java:760)
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:681)
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:639)
	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526)
	at com.jpro.boot.SpecialClassLoader.findClass(SpecialClassLoader.java:24)

Working with java 21

jproVersion = 2024.4.1
javafxVersion = 21.0.5

[FlorianKirmaier]

How do you set the JavaFX Version?
You have to set the JavaFX Version in the gradle/maven plugin.
JavaFX25 requires JDK23 or higher - which is the default for JPro.

If you set javafxVersion = 24 in the plugin,
than it should work.

[einfachBlu]

I have set the javafxVersion in the gradle.properties which is then used for all things - javafx plugin, dependencies etc.
But I am wondering, in the version it says that the requirement is Java 21, not java 23

[FlorianKirmaier]

In the build.gradle, you have to configure the JavaFX version, which JPro is using.
You can do it like the following:

jpro {
    port = 8082
    javafxVersion = "23"
}