Develop Reference

Violet UML Editor doesn't start on mac

I am using eclipse for a coding course at school, and I am required to install Violet UML Editor http://alexdp.free.fr/violetumleditor/page.php to create PDF of classes.
Anyway, I downloaded a .jar file. My mac doesn't like that it's from an unverified developer so I must manually allow it to open in system preferences. The .jar opens to the loading tab but it wont open the program.
'''Javac -version''' in terminal says javac 16.02. As far as I know, JDK holds JRE which I need to run Violet. To be safe I installed JRE from Oracle which was a JDK 8 file but it didn't work so I just deleted it.
UPDATE: Using terminal and entering '''java -jar violetumleditor-3.0.0.jar''' I get the error code
Error: Unable to access jarfile violetumleditor-3.0.0.jar
the .jar is located on my desktop, it should be found
Also yes I did a fresh 3.0 version install to try and the same thing.
UPDATE 2:
java -version gives
java version "16.0.2" 2021-07-20
Java(TM) SE Runtime Environment (build 16.0.2+7-67)
Java HotSpot(TM) 64-Bit Server VM (build 16.0.2+7-67, mixed mode, sharing)
Thinking it's a permission with accessing desktop issue.

There is a bug open for this:
https://sourceforge.net/p/violet/bugs/69/
I personally don't think it would be fixed anytime soon.
I can recommend two alternative tools such as:
https://www.visual-paradigm.com/solution/uml/uml-tool-for-mac/
https://gitmind.com

Minecraft Client environment not running through vscode on MAC

For some reason this issue is to do with with gradle and yarn, no matter what I do to try and get the 'fabric-loom' plugin working, nothing works. It says i am using an outdated version of Java, that i'm on Java 11 (I'm not, I did 'java -version' in the bash terminal), I'm on Mac btw, and it said I'm on Java 16.0.2, which is the version it tells me to be on, I'll attach logs and some code I wrote. If someone could help me, that would be great, thanks in advance :)
Crash Log:
Could not run phased build action using connection to Gradle distribution 'https://services.gradle.org/distributions/gradle-7.2-bin.zip'. Build file '/Users/joeplemople/Desktop/joes blocks/build.gradle' line: 2 An exception occurred applying plugin request [id: 'fabric-loom', version: '0.9-SNAPSHOT'] Failed to apply plugin 'fabric-loom'. You are using an outdated version of Java (11). Java 16 or higher is required.
(This was outputted twice for some reason, idk why)
Terminal Code (Bash):
Displaying what versions of java I have installed JoepleMoples-MacBook-Pro:
joes blocks joeplemople$ /usr/libexec/java_home -V Matching Java Virtual Machines (2): 16.0.2, x86_64: "Java SE 16.0.2" /Library/Java/JavaVirtualMachines/jdk-16.0.2.jdk/Contents/Home 11.0.12, x86_64: "Java SE 11.0.12" /Library/Java/JavaVirtualMachines/jdk-11.0.12.jdk/Contents/Home
Me setting the default version of Java to Java (JDK) 16:
/Library/Java/JavaVirtualMachines/jdk-16.0.2.jdk/Contents/Home JoepleMoples-MacBook-Pro:joes blocks joeplemople$ export JAVA_HOME=$(/usr/libexec/java_home -v 16.0.2) JoepleMoples-MacBook-Pro:joes blocks joeplemople$ java -version java version "16.0.2" 2021-07-20 Java(TM) SE Runtime Environment (build 16.0.2+7-67) Java HotSpot(TM) 64-Bit Server VM (build 16.0.2+7-67, mixed mode, sharing)
Thanks in advance
:)

Open Command Palette and choose Java: Configure Java Runtime, select jdk16 for both Project JDKs and Java Tooling Runtime.
Then reload window to make change effective and see if the error goes away.

JDK not found on Debian 8.5

I want to make a python-android-app using this software. I have installed java JDK, when i run java -version i get:
java version "1.8.0_91"
Java(TM) SE Runtime Environment (build 1.8.0_91-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.91-b14, mixed mode)
However running the line python android.py installsdk from witin rapt directory (as described in the tutorial) tells me that i have no JDK:
I'm compiling a short test program, to see if you have a working JDK
on your system.
I was unable to use javac to compile a test file. If you haven't
installed the Java Development Kit yet, please download it from:
http://www.oracle.com/technetwork/java/javase/downloads/index.html
The JDK is different from the JRE, so it's possible you have Java
without having the JDK. Without a working JDK, I can't continue.

You need to set your jdk to be accesible, and within path / java home :)
Here help from google:
To set JAVA_HOME environment variable, do the following: Launch
Terminal by pressing Ctrl + Alt + T on your keyboard. Depending on
where you installed your Java, you will need to provide the full path.
For this example, I installed Oracle JDK 7 in the
/usr/lib/jvm/java-7-oracle directory.Aug 13, 2012

Unable to install Java Runtime (6) on Mac

I'm having a problem of installing java SE runtime 6 on mac, without that, I can't open my eclipse or install Intellij. However, I download the .dmg through an Apple - Java link, but it just doesn't install!
And there's no error message, just the page of falling installation.
I really don't know how to solve it.
This is kind of an update of my problem... I used to have Java SE runtime 6 and tried to install jdk 1.8 and failed. Same picture appeared. Just said failed installing with no error messages. I guessed might be a conflicts? and deleted Java 6 and basically can't run eclipse & Intellij (this solved thought) I still have java 1.7 here.
I just can't figure out why I can't install (or reinstall) java 1.6 or java 1.8. What could be the problem?
Some system updates:
if I do: "which java":
/usr/bin/java
if "echo $JAVA_HOME":
/Library/Java/JavaVirtualMachines/jdk1.7.0_51.jdk/Contents/Home
if java -version:
java version "1.7.0_51"
Java(TM) SE Runtime Environment (build 1.7.0_51-b13)
Java HotSpot(TM) 64-Bit Server VM (build 24.51-b03, mixed mode)
What could be possibly wrong?!!!????
God

You need to get Java directly from Oracle (http://www.oracle.com/technetwork/java/javase/downloads/index.html) as Apple stopped supporting Java some time ago. Unless you have pressing reasons for using Java 6 I suggest also installing at least Java 7, although you can have all three versions installed and select the appropriate version for the app you want to run/develop.
Edit Also, if you want to use Eclipse or IntelliJ (go for IntelliJ) you want to get the JDK and not the "runtime" (JRE).

Eclipse doesn't find my java 8 library (mac)

I have installed java 8 SDK on my mac and terminal says java -version is
java version "1.8.0_11"
Java(TM) SE Runtime Environment (build 1.8.0_11-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.11-b03, mixed mode)
bur when i create a project in eclipse with JSE 1.8 this is what happens:
as you can see, no library is assigned:
when i try to add a new environment, this is what i get:
any help or suggestions?

You need to select the home, eg /Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home

The link to your Java 8 environment must be broken. Go to Window, Preferences, search "jre", select Installed JREs, and create a new environnment. Give the path to a JDK rather than a JRE. Then, right click on your project, Properties, Build path, Edit the current JRE and replace it with the new one.
You will also need to right click on your project, Properties, Java compiler, and set the compiler compliance to 1.8.

I have Eclipse Luna 4.4 on my Mac OSX 10.10 and I was having the same issue. I was able to resolve it by going to Preferences -> Java -> Installed JREs and "Add" the path to JRE home in the JDK: (/Library/Java/JavaVirtualMachines/jdk1.8.0_25.jdk/Contents/Home/jre). That did it