java.lang.UnsupportedClassVersionError: com/android/apksigner/ApkSignerTool 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

Thank you for taking the time to report this bug and helping to make Ubuntu better. I have uploaded a package into disco-proposed with the fix. Meanwhile the uploads to bionic-proposed and cosmic-proposed are waiting for approval, a bot will add a notice when they get approved.

Since it is late and approval requires manual intervention by an admin we might only get someone to look this over on Monday.

Hello Andreas, or anyone else affected,

Accepted android-platform-tools-apksig into bionic-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/android-platform-tools-apksig/0.8-2ubuntu1~18.04 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested and change the tag from verification-needed-bionic to verification-done-bionic. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-bionic. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

Hello Andreas, or anyone else affected,

Accepted android-platform-tools-apksig into cosmic-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/android-platform-tools-apksig/0.8-2ubuntu1~18.04 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested and change the tag from verification-needed-cosmic to verification-done-cosmic. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-cosmic. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

On Bionic, nothing has changed.

$ dpkg -l apksigner
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-================================================================-=====================================-=====================================-======================================================================================================================================
ii apksigner 0.8-2~18.04 all command line tool to sign and verify Android APKs
$ which apksigner
/usr/bin/apksigner
$ /usr/bin/apksigner
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.UnsupportedClassVersionError: com/android/apksigner/ApkSignerTool 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)

Damn, the repository still had the old version. Now, with the new version, it works. Sorry for that.

This bug was fixed in the package android-platform-tools-apksig - 0.8-2ubuntu1

---------------
android-platform-tools-apksig (0.8-2ubuntu1) disco; urgency=medium

  * Compile for Java 8: (LP: #1821235)
    - debian/rules: the parameter '-target 8' must be set to get got compiled
      for OpenJDK 8, setting '--release 8' is the best way as it guarantees
      that the whole '-source/-target/-bootclasspath' triad is correctly set.

 -- Tiago Stürmer Daitx <email address hidden> Fri, 22 Mar 2019 21:15:35 +0000

Works on Cosmic, too. Thanks!

This bug was fixed in the package android-platform-tools-apksig - 0.8-2ubuntu1~18.04

---------------
android-platform-tools-apksig (0.8-2ubuntu1~18.04) bionic; urgency=medium

  * Backport for OpenJDK 11. LP: #1819448.

android-platform-tools-apksig (0.8-2ubuntu1) disco; urgency=medium

  * Compile for Java 8: (LP: #1821235)
    - debian/rules: the parameter '-target 8' must be set to get got compiled
      for OpenJDK 8, setting '--release 8' is the best way as it guarantees
      that the whole '-source/-target/-bootclasspath' triad is correctly set.

android-platform-tools-apksig (0.8-2) unstable; urgency=medium

  [ Emmanuel Bourg ]
  * Removed the alternative build dependency on openjdk-8-jdk

  [ Kai-Chung Yan ]
  * Install Maven artifacts of `apksig.jar`
  * Standards-Version => 4.2.1
  * uscan: Watch for `gradle-*` tags instead of `android-*_r*`
  * Instal Maven artifacts for `apkgsig.jar`
  * Remove unused build-dependencies: antlr3 groovy maven-debian-helper
  * apksigner now requires JRE >= 8 since it is compiled on source level 8
  * Add myself to Uploaders
  * Install `apksigner` into Android SDK home

  [ Hans-Christoph Steiner ]
  * Use real URLs for Vcs-Git, not ones that redirect
  * Add autopkgtest for APK verification
  * Add GitLab CI support

 -- Tiago Stürmer Daitx <email address hidden> Sat, 23 Mar 2019 00:19:26 +0000