invalid file (bad magic number): Exec format error

[Calendros]

Hello,

The package contains debian/links file which links /usr/share/ditaa/ditaa.jar to /usr/bin/ditaa. In my ubuntu version, the jar can not be executed directly, "/usr/bin/ditaa" results in the following error:

 invalid file (bad magic number): Exec format error

After creating a simple wrapper:

 #!/bin/sh
 exec java -jar /usr/share/ditaa/ditaa.jar

works for me.

My package version is: 0.9+ds1-3 but it the link file (in debian/*) is still present in version ditaa_0.10+ds1-1.debian.tar.xz.

I'm on Ubuntu 15.04.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[smithfarm (presnypreklad)]

This bug is present on Trusty, too.

[Janet (bugzilla-kerridis)]

It doesn't seem to be a ditaa problem but an openjdk problem? I also get the error when I try to start other java apps on 14.04 without exec - but on 15.10 (openjdk version "1.8.0_91") it is ok.

[Kevin Locke (kevinoid)]

I just ran into this issue with a self-compiled jar file and confirmed that I have the same issue with ditaa on Debian. Checking the binfmt_misc configuration may be useful. To see what interpreters will be tried by binfmt_misc, run `/usr/sbin/update-binfmts --find /usr/bin/ditaa`. Then try running the interpreter with the jar file directly (e.g. `/usr/bin/jarwrapper /usr/bin/ditaa`) to see if it works.

If update-binfmts does not print anything, that suggests either corruption of the JAR file (check `od -An -tx1 -N4 /usr/share/ditaa/ditaa.jar` is `50 4b 03 04`) or that jarwrapper is not correctly registered (check `/usr/sbin/update-binfmts --display jarwrapper` prints `jarwrapper (enabled)`).

If update-binfmts prints `/usr/bin/jexec` (or anything else) in addition to `jarwrapper` and those interpreters do not work, this suggests conflicting binfmt_misc registrations. Check the output of `/usr/sbin/update-binfmts --display` to find out which package installed it. You can then remove it by running something like `sudo update-binfmts --package openjdk-8 --remove jar /usr/bin/jexec`.

The issue, as it appeared on my system, was that the openjdk packages (e.g. openjdk-8-jre-headless) install /usr/bin/jexec as a binfmt_misc handler but jexec doesn't work with this jar. Java version mismatch perhaps? I found the issue of jexec/jarwrapper conflict has been raised before at https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=136993#82 without response. Perhaps it's time to raise it again? I'd reassign this bug to openjdk-8-jre-headless.

[Kevin Locke (kevinoid)]

See also https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=855858