Since the update yesterday (yes, the linux update), eclipse denies me to run even the most simple helloworld:
has been compiled by a more recent version of the Java Runtime (class file version 53.0), this version of the Java Runtime only recognizes class file versions up to 52.0
Full error text:
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.UnsupportedClassVersionError: gitplayground/HelloWorld has been compiled by a more recent version of the Java Runtime (class file version 53.0), 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:763)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:338)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:495)
I tried to update the JRE (and JDK):
- window -> preferences -> java -> installed JREs. I could check:
java-8-openjdk-amd64
(which is currently) orjava-11-openjdk-amd64
. - window -> preferences -> java -> compiler. Compiler compliance level is set to 1.8 (it doesn't know java 11. It does know java 9.)
- window -> preferences -> java -> Installed JREs -> Execution Environment. When clicking on
JavaSE-1.8
in the left list, 2 options appear in the right one:java-8-openjdk-amd64
andjava-1.8-openjdk-amd64
. First one is checked. (But I don't think, that matters, because these should be the same.) - I tried to update eclipse. (No updates available)
So anything is set to Java8. Why does the error still occur?
Btw, some of my projects (the helloworld including) are marked with a red exclamation mark, but the error appears in any project, not in these only.
- I use XUbuntu 18.04 now (before the update anything worked fine)
- I use eclipse Photon
- I use java standard API only
- I use git and the eclipse git plugin