Package Details: bluej 4.2.2-1

Git Clone URL: (read-only, click to copy)
Package Base: bluej
Description: An integrated Java environment specifically designed for introductory teaching
Upstream URL:
Licenses: GPL2, custom, BSD, MIT, Apache, LGPL2.1, CPL
Submitter: zerathidune
Maintainer: chetgurevitch
Last Packager: chetgurevitch
Votes: 74
Popularity: 0.022948
First Submitted: 2007-11-19 19:23
Last Updated: 2019-10-12 19:07

Dependencies (4)

Required by (0)

Sources (3)

Latest Comments

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KingFail commented on 2020-10-09 11:03

Application works, but many of its pop-up dialogs have zero size, showing up as just a vertical line. Doesn't happen for "Open Editor" and such, but for "Delete" on a class, "Tools > Teams > Checkout Project", and various important functionality this happens. Weirdly it sometimes randomly works, but I have yet to figure out the pattern.

Any ideas?

arkoprovo1996 commented on 2020-05-01 07:18

Exception in thread "main" java.lang.NoClassDefFoundError: javafx/application/Application

Although It is installed. Java-13-OpenJDK, Java-11-OpenJDK, both give same error. Could anyone help please?

nomisge commented on 2020-03-06 09:55

To be able to have bluej automatically open when clicked on project.bluej file, please add a mime type. I realized it with following additions:

I included a bluej.install with following content:

post_install() {
    if test -x /usr/bin/update-mime-database usr/share/mime &> /dev/null; then update-mime-database usr/share/mime &> /dev/null; fi

post_upgrade() {

pre_remove() {
    if test -x /usr/bin/update-mime-database usr/share/mime &> /dev/null; then update-mime-database usr/share/mime &> /dev/null; fi

Added bluej.xml

<?xml version="1.0" encoding="UTF-8"?>
 <mime-info xmlns="">
  <mime-type type="application/x-bluej.package">
         <comment>BlueJ Package</comment>
         <comment xml:lang="de">BlueJ Paket</comment>
         <glob pattern="*.bluej"/>

And changed bluej.desktop

[Desktop Entry]
Comment=A simple powerful Java IDE
Exec=bluej %u

And finally updated source and sha256sums lines in PKGBUILD and added:

install -Dm644 "${pkgname}.xml" "${pkgdir}/usr/share/mime/packages/${pkgname}.xml"

joesv commented on 2019-11-16 22:03

I just installed the package on arch linux running the 5.3.11 kernel, however no fonts are being rendered in the program. If I hover around the header I can see submenus however none of the text is being rendered.

chromanju commented on 2019-10-27 19:16

[ SOLVED ] Up to now, I tried several (re-)installs with regard to java/javafx under Manjaro - no success. I (still) receive the following errors when starting BlueJ:

Any ideas? Help really appreciated!!

Starting from scratch, re-installing all dependencies, BlueJ runs again.

ChuckWhite commented on 2019-10-12 23:37

I thought I was stuck but Jakobchs comment helped me out. Apparently if BlueJ seems to be stuck loading it opens another window where you need to confirm something but the windows is too small to see something and not resizable. Just hit enter.

chromanju commented on 2019-10-12 19:49

@chetgurevitch Thank you for your quick reply and help. Unfortunately, I couldn't figure out anything I could install additionally or change. I posted the output of

$ pacman -Fl java11-openjfx on

and $ archlinux-java status results in

java-11-openjdk java-12-jdk (default) java-13-openjdk java-8-jre/jre

(as written in my first post)

The installed Bluej-Version is 4.2.2-1.

Appreciate your help!

chetgurevitch commented on 2019-10-12 18:53

@chromanju can't reproduce, make sure you're using the latest PKGBUILDs (4.2.1-5 and 3.6.0-3), you have java11-openjfx installed, and your system is fully up to date. If you're still experiencing the issue please post the output of

$ pacman -Fl java11-openjfx


$ archlinux-java status

edit: about to update bluej to 4.2.2, would be best if you could test with this version

chromanju commented on 2019-10-12 09:19

BlueJ still won't start resulting in these error(s); help required: xception in thread "main" java.lang.NoClassDefFoundError: javafx/application/Application at java.base/java.lang.ClassLoader.defineClass1(Native Method) at java.base/java.lang.ClassLoader.defineClass( at java.base/ at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(

BTW: same problem with greenfoot at java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull( at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull( at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass( at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass( at java.base/java.lang.ClassLoader.loadClass( at bluej.Boot.main( Caused by: java.lang.ClassNotFoundException: javafx.application.Application at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass( at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass( at java.base/java.lang.ClassLoader.loadClass(

Installed java-versions: java-11-openjdk, java-12-jdk (default), java-13-openjdk, java-8-jre/jre

BTW: similar problem with greenfoot

Jakobch commented on 2019-09-19 08:43

Bluej gets stuck in loading screen and is not responding when I try to open it. I had bluej installed before the 3 latest updates, where it worked fine.

Terminal output: (java:10299): Gdk-WARNING **: 10:34:56.196: XSetErrorHandler() called with a GDK error trap pushed. Don't do that.

Edit: Never mind. You just need to smash some random keys, when it is stuck on loading screen for bluej to open.