I recently installed bluej from ducke university's website which was written to to teach java programming in coursera courses.It successfully installed but when i tried to run it was repeatedly giving error and I searched in internet but there were no exact solution given. The error it given was included in this question.
Anyone know a good Java IDE for the Pi? I tried downloading Eclipse but it didn't work (probably because it's too heavyweight). I need an IDE with low RAM usage and low memory usage, just so it will actually work :) Help appreciated.
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Geany - support:java syntax highlight,geany projects to store custom javac compile and java run arguments if needed, you need to specify -classpath to include external java libraries.one button compile/run.
I also recommend looking at DrJava, it is also a lightweight IDE written entirely in Java Swing.DrJava got a built-in powerful "interactive" mode that allows quick experimentation with java expressions similar to using interactive python, thus suitable for use by new java students.DrJava support breakpoint debugging and junit test creation.Installation is a snap you download the latest DrJava .jar and run it:
NO NEED FOR AN IDE :) keep eclipse-like memory hogs off your pi. Or if you really want to be more hardcore, use vim or emacs with syntax highlighting and compile your .java files to .class files via command-line with javac. Or find some light-weight IDE or sublime text / eclipse replacement. However... if you have a stronger alternative system at your disposal (which I suspect most of us have) and can run eclipse on there, then there's no need for extra work.
Source code for each sample is in the javafx-samples-version\src directory. To view the source code, go to the javafx-samples-version\src\sample directory, where sample is the name of the application in which you are interested. Each of the sample source directories is a NetBeans project.
Which openjfx libraries did you install? the "default" openjfx packages have been bumped to java 12 compatibility, you will want to install java11-openjfx if you want to continue to use java11 as your primary runtime.
The package currently does not seem to install, failing at the prepare() part. From version 5.2.1 of the .deb file of bluej, bsdtar exstracts to a .xz file, not .zst as the package expects. So line 34 of PKGBUILD fails with "No such file or directory". Changing this to "data.tar.xz" the package installs correctly.
I would have liked to tweak the pkgbuild file to ask for java-openjfx>=20 (greater or equal to 20) in order for it to accept the existing newer versions, but it still fails. Maybe I did something wrong, because I am not a specialist and this was the first time I changed something in a pkgbuild.
Do I have to create a link to the java-openjfx so that it thinks there is a version 20 on my system? This doesn't seem to be the correct way to solve this problem. Or would you please make the installer accept versions 20 or higher?
The packages is using the systemwide java. But I had to link to javafx bundled with bluej. I couldn't get it to fully work with systemwide javafx. Since I didn't have the time to debug and find all files, that need to be changed to link to systemwide javafx, I decided to just 'make it work', by using bundled javafx.If anyone knows how to make it work with systemwide javafx, let me know.
On the newest version I had to change the -Xmx parameter of archlinux-java-run to something higher (I used 1024M) otherwise bluej wouldn't start ("malloc(): corrupted top size"). Not sure whether that's just me but thought I'd let you know, maybe it helps someone.
As you can see there is a link for Windows in the middle of the page, just click the bluejsetup****.exe and save the file. Once you saved the file you can install it just like any other software, yes you guessed it right run the installer.
Now the only two things that you will need are: the opencv-3xx.jar file located at \opencv\build\java and the opencv_java3xx.dll library located at \opencv\build\java\x64 (for 64-bit systems) or \opencv\build\java\x86 (for 32-bit systems). The 3xx suffix of each file is a shortcut for the current OpenCV version, e.g., it will be 300 for OpenCV 3.0 and 330 for OpenCV 3.3.
To install OpenCV (with Java support) through Homebrew, you need to edit the opencv formula in Homebrew, to add support for Java:brew edit opencvIn the text editor that will open, change the line:-DBUILD_opencv_java=OFFin-DBUILD_opencv_java=ONthen, after saving the file, you can effectively install OpenCV:brew install --build-from-source opencv
After the installation of OpenCV, the needed jar file and the dylib library will be located at /usr/local/Cellar/opencv/3.x.x/share/OpenCV/java/, e.g., /usr/local/Cellar/opencv/3.3.1/share/OpenCV/java/.
Now open the terminal, go to the build folder of OpenCV and compile everything with the command: make -j. Notice that the -j flag tells make to run in parallel with the maximum number of allowed job threads, which makes the build theoretically faster.Wait for the process to be completed...If everything went well you should have opencv-3xx.jar in the /opencv/build/bin directory and libopencv_java3xx.so in the /opencv/build/lib directory. The 3xx suffix of each file is a shortcut for the current OpenCV version, e.g., it will be 300 for OpenCV 3.0 and 330 for OpenCV 3.3. This is everything you need.
In case of MacOS, if you installed OpenCV without Homebrew, you need to create a soft link with .dylib extension for the .so file. E.g., from the terminal, type:ln -s libopencv_java300.so libopencv_java300.dylib
Fixed: Closing code editor kills created objects and clears the the object bench
Fixed: After switching to another language, Preferences disappear from the Mac app menu and some keyboard shortcuts will not work
Fixed: Debugger is not stopping on some Breakpoints
Fixed: Backspace doesn't work in Terminal on Mac
Fixed: Add stereotype markers again (/) in class diagram
Fixed: Lack of scrolling with lots of methods either in unit test, Class popup or Object popup menus
Fixed (MacOS X): Projects can't be opened with double click on "package.bluej" when BlueJ is open
The options above will work if you want to distribute a single static configuration choice that will work for a long time. If your configuration changes more frequently, however, you can use a URL instead. Set the configfile property in lib/bluej.defs as described above, but give a URL that points to your configuration file. The same technique works with the properties file, too. Now the extension will dynamically load your configuration over the web. If the extension cannot retrieve the remote configuration it will issue and appropriate warning and fall back to using default_checks.xml.
java and javac binaries on RHEL 8 are managed by the alternatives system. This means a system administrator can switch the system java (or javac) to be something other than the default, JDK 8. The alternatives system uses priorities in order to determine which JDK should be available via /usr/bin/java. JDK 8 has been given a higher priority on RHEL-8 than JDK 11. But we are getting ahead of ourselves. First, lets see which binaries are managed by alternatives:
This will switch the system java binary to JDK 11. We do the same for javac since java and javac are independently managed. There is no need to switch anything else as every other JDK binary will switch either with the java or the javac binary: 0852c4b9a8
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