jpackage usage problems

[Alexey Semenyuk]

Hi Hiran,

Looks like jpackage fails because of missing package name on the command 
line.
I agree that the error message is not helpful. Can you try one of jdk19 
EA builds [1] to see if the problem is reproducible?

[1] https://jdk.java.net/19/

- Alexey

On 4/1/2022 5:58 AM, Hiran Chaudhuri wrote:
> Hello there.
>
> While I am trying to package my project using jpackage 16.0.1 on Ubuntu
> 20 LTS I have difficulty in assembling the correct commands.
>
> The documentation covers a lot but not everything. For example, it is
> not clear to me when I have to provide an option - especially since I
> meanwhile take a two step approach of building the appimage, then
> tweaking something (that could have done by JPackage directly) and
> finally building the DEB package.
>
> While I believe the documentation is good enough, the error messages
> presented by JPackage are not. Here is one example. Hopefully you agree
> that the NullPointerException does not at all tell me what is wrong and
> what I could improve on.
>
> My feeling is that JPackage should do some better error handling and
> come up with improved messages.
>
> Hiran
>
>
> $ jpackage --app-image build/app-image --verbose --dest build
> [10:34:45.915] Warning: app-image dir not generated by jpackage.
> [10:34:45.930] Running dpkg
> [10:34:45.937] Command:
>      dpkg --print-architecture
> [10:34:45.937] Output:
>      amd64
> [10:34:45.939] Returned: 0
>
> [10:34:45.944] Running dpkg
> [10:34:45.961] Command:
>      dpkg -s coreutils
> [10:34:45.962] Output:
>      Package: coreutils
>      Essential: yes
>      Status: install ok installed
>      Priority: required
>      Section: utils
>      Installed-Size: 7196
>      Maintainer: Ubuntu Developers <
> ubuntu-devel-discuss at lists.ubuntu.com>
>      Architecture: amd64
>      Multi-Arch: foreign
>      Version: 8.30-3ubuntu2
>      Pre-Depends: libacl1 (>= 2.2.23), libattr1 (>= 1:2.4.44), libc6 (>=
> 2.28), libselinux1 (>= 2.1.13)
>      Description: GNU core utilities
>       This package contains the basic file, shell and text manipulation
>       utilities which are expected to exist on every operating system.
>       .
>       Specifically, this package includes:
>       arch base64 basename cat chcon chgrp chmod chown chroot cksum comm
> cp
>       csplit cut date dd df dir dircolors dirname du echo env expand
> expr
>       factor false flock fmt fold groups head hostid id install join
> link ln
>       logname ls md5sum mkdir mkfifo mknod mktemp mv nice nl nohup nproc
> numfmt
>       od paste pathchk pinky pr printenv printf ptx pwd readlink
> realpath rm
>       rmdir runcon sha*sum seq shred sleep sort split stat stty sum sync
> tac
>       tail tee test timeout touch tr true truncate tsort tty uname
> unexpand
>       uniq unlink users vdir wc who whoami yes
>      Homepage: http://gnu.org/software/coreutils
>      Original-Maintainer: Michael Stone <mstone at debian.org>
> [10:34:45.962] Returned: 0
>
> [10:34:45.963] Running dpkg-deb
> [10:34:45.965] Warning: app-image dir not generated by jpackage.
> [10:34:45.967] Warning: app-image dir not generated by jpackage.
> [10:34:45.967] java.lang.NullPointerException: Cannot invoke
> "java.lang.CharSequence.length()" because "this.text" is null
>          at
> java.base/java.util.regex.Matcher.getTextLength(Matcher.java:1769)
>          at java.base/java.util.regex.Matcher.reset(Matcher.java:415)
>          at java.base/java.util.regex.Matcher.<init>(Matcher.java:252)
>          at java.base/java.util.regex.Pattern.matcher(Pattern.java:1134)
>          at
> jdk.jpackage/jdk.jpackage.internal.LinuxDebBundler.lambda$static$1(Linu
> xDebBundler.java:83)
>          at
> jdk.jpackage/jdk.jpackage.internal.LinuxPackageBundler.validate(LinuxPa
> ckageBundler.java:72)
>          at
> jdk.jpackage/jdk.jpackage.internal.Arguments.generateBundle(Arguments.j
> ava:663)
>          at
> jdk.jpackage/jdk.jpackage.internal.Arguments.processArguments(Arguments
> .java:538)
>          at jdk.jpackage/jdk.jpackage.main.Main.execute(Main.java:98)
>          at jdk.jpackage/jdk.jpackage.main.Main.main(Main.java:52)
> [10:34:45.969] jdk.jpackage.internal.PackagerException: Bundler DEB
> Bundle failed because of java.lang.NullPointerException: Cannot invoke
> "java.lang.CharSequence.length()" because "this.text" is null
>          at
> jdk.jpackage/jdk.jpackage.internal.Arguments.generateBundle(Arguments.j
> ava:685)
>          at
> jdk.jpackage/jdk.jpackage.internal.Arguments.processArguments(Arguments
> .java:538)
>          at jdk.jpackage/jdk.jpackage.main.Main.execute(Main.java:98)
>          at jdk.jpackage/jdk.jpackage.main.Main.main(Main.java:52)
> Caused by: java.lang.NullPointerException: Cannot invoke
> "java.lang.CharSequence.length()" because "this.text" is null
>          at
> java.base/java.util.regex.Matcher.getTextLength(Matcher.java:1769)
>          at java.base/java.util.regex.Matcher.reset(Matcher.java:415)
>          at java.base/java.util.regex.Matcher.<init>(Matcher.java:252)
>          at java.base/java.util.regex.Pattern.matcher(Pattern.java:1134)
>          at
> jdk.jpackage/jdk.jpackage.internal.LinuxDebBundler.lambda$static$1(Linu
> xDebBundler.java:83)
>          at
> jdk.jpackage/jdk.jpackage.internal.LinuxPackageBundler.validate(LinuxPa
> ckageBundler.java:72)
>          at
> jdk.jpackage/jdk.jpackage.internal.Arguments.generateBundle(Arguments.j
> ava:663)
>          ... 3 more
>
> $
>
>