Error when trying to run Java Eclipse Project

Question

Getting this error when trying to run JavaFX program. Does it have something do do with what version of Java i'm running on Eclipse? Current running jdk-11.0.2 and maybe running it on 1.8 would do the trick.

Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.UnsupportedClassVersionError: javafx/application/Application has been compiled by a more recent version of the Java Runtime (class file version 54.0), this version of the Java Runtime only recognizes class file versions up to 52.0
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:756)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:468)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:74)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:756)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:468)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:74)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
    at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:495)

You *are* running it on Java 1.8. Since you compiled it with a version compiler, you need to run it with at least version 10. See https://stackoverflow.com/questions/9170832/list-of-java-class-file-format-major-version-numbers — James_D, Oct 23 '20 at 18:33
Yes right, there is version problem code is compiled on newer version and running on old version. — Shahid Farooq, Oct 23 '20 at 18:34

score 0 · Answer 1 · answered Oct 27 '20 at 10:50

As mentioned in official release notes of JDK 11

JavaFX is no longer included in the JDK. It is now available as a separate download from openjfx.io.

Yes, running on JDK1.8 would do the trick. But make sure to use Oracle JDK 1.8 and not OpenJDK 1.8. (You can get JavaFX to work on OpenJDK, but it'll be an extra hassle)

Error when trying to run Java Eclipse Project

1 Answers1