pdfsam fails launching (incompatible JRE?)

[Antoine Pitrou]

$ pdfsam
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.UnsupportedClassVersionError: org/pdfsam/basic/App has been compiled by a more recent version of the Java Runtime (class file version 55.0), 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:468)
 at java.net.URLClassLoader.access$100(URLClassLoader.java:74)
 at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
 at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
 at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
 at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:495)

$ echo $JAVA_HOME
/usr/lib/jvm/java-8-oracle

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: pdfsam 4.0.1-1~18.04
ProcVersionSignature: Ubuntu 4.15.0-74.84-generic 4.15.18
Uname: Linux 4.15.0-74-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.9
Architecture: amd64
CurrentDesktop: XFCE
Date: Thu Jan 9 21:48:40 2020
InstallationDate: Installed on 2013-04-12 (2463 days ago)
InstallationMedia: Xubuntu 13.04 "Raring Ringtail" - Alpha amd64 (20130409)
PackageArchitecture: all
SourcePackage: pdfsam
UpgradeStatus: Upgraded to bionic on 2018-08-17 (510 days ago)

[Antoine Pitrou (pitrou)]

This was solved by removing the stale Oracle Java 8 install. Sorry for the noise.