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https://bugs.launchpad.net/bugs/1727002

Title:
  lib/jrt-fs.jar is incompatible with Java 8

Status in openjdk-9 package in Ubuntu:
  Confirmed
Status in openjdk-9 package in Debian:
  Fix Released
Status in openSUSE:
  Won't Fix

Bug description:
  A program running on Java 8 should be able to use the library to peek
  inside Java 9 (JEP 220 "Modular Run-Time Images" [1], section "New URI
  scheme ...").

  Steps to reproduce:
  1. Download an attached program
  2. `apt install openjdk-8-jdk openjdk-9-jdk`
  3. `/usr/lib/jvm/java-8-openjdk-amd64/bin/javac ReadJrt.java`
  4. `/usr/lib/jvm/java-8-openjdk-amd64/bin/java ReadJrt /usr/lib/jvm/java-9-openjdk-amd64`

  Expected result:
  The program lists root directories of a runtime image (/packages, /modules) and finishes normally.

  Actual result:
  The program fails with the following exception:
  Exception in thread "main" java.lang.NoSuchMethodError: java.nio.ByteBuffer.limit(I)Ljava/nio/ByteBuffer;
  	at jdk.internal.jimage.BasicImageReader.slice(BasicImageReader.java:211)
  	at jdk.internal.jimage.BasicImageReader.intBuffer(BasicImageReader.java:218)
  	at jdk.internal.jimage.BasicImageReader.<init>(BasicImageReader.java:152)
  	at jdk.internal.jimage.ImageReader$SharedImageReader.<init>(ImageReader.java:224)
  	at jdk.internal.jimage.ImageReader$SharedImageReader.open(ImageReader.java:238)
  	at jdk.internal.jimage.ImageReader.open(ImageReader.java:67)
  	at jdk.internal.jimage.ImageReader.open(ImageReader.java:71)
  	at jdk.internal.jrtfs.SystemImage.open(SystemImage.java:59)
  	at jdk.internal.jrtfs.JrtFileSystem.<init>(JrtFileSystem.java:90)
  	at jdk.internal.jrtfs.JrtFileSystemProvider.newFileSystem(JrtFileSystemProvider.java:108)
  	at java.nio.file.FileSystems.newFileSystem(FileSystems.java:336)
  	at ReadJrt.main(ReadJrt.java:33)

  Probable reason:
  Classes in lib/jrt-fs.jar were compiled by Java 9 with options "-source 8"/"target 8". They should be compiled with "--release 8" option instead (or by Java 8).

  
  [1] http://openjdk.java.net/jeps/220

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: openjdk-9-jre-headless 9~b181-4
  ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  ApportVersion: 2.20.7-0ubuntu3
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Oct 24 20:06:01 2017
  InstallationDate: Installed on 2017-09-29 (25 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170926)
  SourcePackage: openjdk-9
  UpgradeStatus: No upgrade log present (probably fresh install)

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