Help trying to run this java app (Calendar, notepad, weather...)

[ItalianUruguayan]

Looking for cool things on Google Code I came across these nice old project, called Koper: https://code.google.com/archive/p/ko...lingKoper.wiki

It's a Java app that has an ebook reader, a calendar, a notepad, a weather application and more.

Some screenshots:





Unfortunately, after following its installing instructions, it does not work at all in my Kobo. But it works perfectly on my computer when I open it with the Java runtime environment

Inside the Kobo, running the "java" binary does not produce any output. In Debian, typing "java" gives this:

Usage: java [-options] class [args...]
(to execute a class)
or java [-options] -jar jarfile [args...]
(to execute a jar file)
where options include:
-d32 use a 32-bit data model if available
-d64 use a 64-bit data model if available
-client to select the "client" VM
-zero to select the "zero" VM
-dcevm to select the "dcevm" VM
-server is a synonym for the "client" VM [deprecated]
The default VM is client,
because you are running on a server-class machine.


-cp <class search path of directories and zip/jar files>
-classpath <class search path of directories and zip/jar files>
A : separated list of directories, JAR archives,
and ZIP archives to search for class files.
-D<name>=<value>
set a system property
-verbose:[class|gc|jni]
enable verbose output
-version print product version and exit
-version:<value>
Warning: this feature is deprecated and will be removed
in a future release.
require the specified version to run
-showversion print product version and continue
-jre-restrict-search | -no-jre-restrict-search
Warning: this feature is deprecated and will be removed
in a future release.
include/exclude user private JREs in the version search
-? -help print this help message
-X print help on non-standard options
-ea[:<packagename>...|:<classname>]
-enableassertions[:<packagename>...|:<classname>]
enable assertions with specified granularity
-da[:<packagename>...|:<classname>]
-disableassertions[:<packagename>...|:<classname>]
disable assertions with specified granularity
-esa | -enablesystemassertions
enable system assertions
-dsa | -disablesystemassertions
disable system assertions
-agentlib:<libname>[=<options>]
load native agent library <libname>, e.g. -agentlib:hprof
see also, -agentlib:jdwp=help and -agentlib:hprof=help
-agentpath:<pathname>[=<options>]
load native agent library by full pathname
-javaagent:<jarpath>[=<options>]
load Java programming language agent, see java.lang.instrument
-splash:<imagepath>
show splash screen with specified image
See http://www.oracle.com/technetwork/ja...ion/index.html for more details.

So I guess that the problem here is that java does not run successfully at the Kobo.

I was wondering if any of you Java wizards out there knew what I need to do in order to be able to run this

[davidfor]

The Kobo firmware does not include Java. If you want to run a Java app, you need to build Java first. I don't remember if anyone has done this.

[labero]

I'm running a java application on the Kobo Glo HD. You can download the correct ARM distribution from Oracle, unpack and then run:

http://www.oracle.com/technetwork/ja...s-2133151.html

[ItalianUruguayan]

Originally Posted by labero

I'm running a java application on the Kobo Glo HD. You can download the correct ARM distribution from Oracle, unpack and then run:

http://www.oracle.com/technetwork/ja...s-2133151.html

Thanks Now Java seems to work, but after executing the command suggested by the guide I get this message:

User directory: /mnt/onboard/koper
/qte/lib:lib::/usr/java/packages/lib/arm:/lib:/usr/lib

And then nothing happens. The app should have launched. Weird

BTW, which Java apps are you running on your device? Just curious.

[traycold]

Not completely sure about it, but I guess that to run java code that can display to screen, you need some kind of driver to write to framebuffer. Also, if you need to catch touchscreen events, you need some driver for it.
And I never heard of them, at least on this forum (nobody made java development on kobo for what I know).

[jcn363]

Do you setting up Java environment variables?

Spoiler:

# export JAVA_HOME=/opt/java/jdk-x.x.x/ (where you have installed)
# export JRE_HOME=$JAVA_HOME/jre
# export PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin

[latepaul]

FYI - here's the original thread about this app from 2012. I don't think sven has been around for a while, but you could try PMing him.

[ItalianUruguayan]

Originally Posted by jcn363

Do you setting up Java environment variables?

Spoiler:

# export JAVA_HOME=/opt/java/jdk-x.x.x/ (where you have installed)
# export JRE_HOME=$JAVA_HOME/jre
# export PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin

Thank you! This has made it work

The screen buttons are too small and there is some unexpected behavior, but that should be easy to fix.

[labero]

Originally Posted by ItalianUruguayan

BTW, which Java apps are you running on your device? Just curious.

I've made an own "information screen" written in Java. Unfortunately at the time of coding the information screen I didn't manage to find a library that could draw to the framebuffer, so I made my own. Perhaps I should check how koper is drawing on the display...