Compatibility Problem with javafx-8.0.jar

[elkassar]

Val<T> extends javafx.beans.value.ObservableValue. However, "javafx-8.0.jar" is using another version of javafx.beans.value.ObservableValue. So, There is a conflict happens whenever we use both jars in the same project.

[TomasMikula]

Hi, what is "javafx-8.0.jar" and where does it come from?

[elkassar]

It is required in my project to load the system library "jfxrt.jar" classes into my project.

groupId: com.oracle
artifactId: javafx
version: 8.0

[TomasMikula]

I still don't understand, does that jar define its own javafx.beans.value.ObservableValue? Does the error arise because you are trying to load a class with the same name twice? What is the error message you get? What JDK version do you use?

[elkassar]

Yes, this jar defines its own javafx.beans.value.ObservableValue, and may be it is a wrapper of this class which is inside "jfxrt.jar" which is existing inside the JDK. Yes the problem arise because there are two different instances of this class inside both jars. I'm using jdk1.8.0_91 or jdk1.8.0_73. Both JDKs have the same problem. The error message is

"java.lang.LinkageError: loader constraint violation: when resolving method "MyClass.(LMyClass;Ljavafx/beans/value/ObservableValue;Z)V" the class loader (instance of org/eclipse/osgi/internal/loader/EquinoxClassLoader) of the current class, MyClass2, and the class loader (instance of org/eclipse/osgi/internal/loader/EquinoxClassLoader) for the method's defining class, MyClass3, have different Class objects for the type javafx/beans/value/ObservableValue used in the signature"

.

Whenever I remove the dependency of any of "javafx-8.0.jar" or "reactfx-2.0-M5.jar", the error disappear.

[TomasMikula]

Well, ReactFX doesn't define javafx.beans.value.ObservableValue, it just uses the one from JDK. I don't understand why you would need an extra jar file (javafx-8.0.jar) when JavaFX is part of the JDK already. You can try to compile ReactFX yourself with a dependency on that jar, to see if that resolves the problem.