Java Community | Help. Code. Learn.•2mo ago

trying to make executable .jar file

I coded a program in intellij with using maven, made an artifact and build it, and if I run the .jar file which gets created using cmd it works. Now I want to make it executable with a double-click without the need of an additional file, but when I try to run it that way an error message saying "A java Exception has occured." pops up, even tho it works when starting the file using java -jar file.jar in cmd. I also installed jarfix prior to this and run it as admin, it works for other .jar files which I needed it for, but doesn't help with my own program. What am I doing wrong?

88 Replies

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Madjosz•2mo ago

Are you sure it packaged the correct JRE into your jar? This error often occurrs when you want to start some newer JARs with Java 1.8.0.

Lloyd_159OP•2mo ago

how can I check which JRE I am using in my build? okay my I think I found it, In my project structure it says I'm using SDK 19. Tho when I run java -version in cmd, it says my current installed java version is 20.0.2, so I should be fine?

Madjosz•2mo ago

I thought you were making a stand-alone jar so your installed Java should not matter in that case.

Lloyd_159OP•2mo ago

oh okay lol so sry for my confusion, but which JRE do I have to use and how can I check that I have the right one? (I thought you meant just using the JRE which I have installed or smth like that)

Madjosz•2mo ago

Can you show how you create the jar?

dan1st•2mo ago

I think jarfix should allow configuring the Java version/JDK installation you are using?

Lloyd_159OP•2mo ago

I include my main class in my pom.xml in maven:

<build>
  <plugins>
      <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-jar-plugin</artifactId>
          <version>3.2.0</version>
          <configuration>
              <archive>
                  <manifest>
                      <mainClass>main.Main</mainClass>
                  </manifest>
              </archive>
          </configuration>
      </plugin>
  </plugins>
</build>

<build>
  <plugins>
      <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-jar-plugin</artifactId>
          <version>3.2.0</version>
          <configuration>
              <archive>
                  <manifest>
                      <mainClass>main.Main</mainClass>
                  </manifest>
              </archive>
          </configuration>
      </plugin>
  </plugins>
</build>

then I going to File -> project strucutre -> artifacts -> add -> JAR -> from modules with dependencies in that menu I choose a namen and the same main class as the one from the pom.xml file and select "extract to the target JAR", click ok and then apply afterwards I go to Build -> Build Artifacts -> select the artifact I just created and click Build the file appears in my out folder when I run it using cmd as descripted in the original message it works and the gui pops up, but with a double click the error appears no clue how to do that, jarfix it never gave me that option

Madjosz•2mo ago

Double click might not use the -jar in the command.

Lloyd_159OP•2mo ago

do you know how I can fix that?

dan1st•2mo ago

that's what jarfix takes care of Can you show the output of jarfix?

Lloyd_159OP•2mo ago

wait wdym? like when I execute jarfix?

dan1st•2mo ago

What does jarfix show when you run it? yeah

Lloyd_159OP•2mo ago

uh it's in German

dan1st•2mo ago

it's fine

Lloyd_159OP•2mo ago

dan1st•2mo ago

ok yeah that's a JDK 8 JRE try running jarfix /k and are you logged in as an administrator?

Lloyd_159OP•2mo ago

does it matter where I do it? yes

dan1st•2mo ago

Lloyd_159OP•2mo ago

like in which directory because cmd doesn't know the command "jarfix"

dan1st•2mo ago

you need to use the right location for jarfix either run it in the directory you installed jarfix in

Lloyd_159OP•2mo ago

okay

dan1st•2mo ago

or use something like C:\path\to\jarfix.exe /k

Lloyd_159OP•2mo ago

well it executed but nothing happened wait nvm jarfix was executed and asked me for permission but nothing else

dan1st•2mo ago

no output? not even where you ran it?

Lloyd_159OP•2mo ago

I just opened cmd and ran C:\Users\username\Downloads\jarfix.exe /k no output tho

dan1st•2mo ago

also no output inside cmd?

Lloyd_159OP•2mo ago

nope nothing

dan1st•2mo ago

I assume the JAR still doesn't work?

Lloyd_159OP•2mo ago

it doesn't

dan1st•2mo ago

What's the output of C:\Users\username\Downloads\jarfix.exe without /k?

Lloyd_159OP•2mo ago

also no output and jarfix also asks me to allow changes to my pc

dan1st•2mo ago

and nothing if you allow it?

Lloyd_159OP•2mo ago

no, nothing no gui which opens or output, and also no output in cmd

dan1st•2mo ago

adding /u doesn't change anything either?

Lloyd_159OP•2mo ago

no change

dan1st•2mo ago

Can you try running jarfix from an administrator cmd? i.e. use the "run as administrator" option with cmd

Lloyd_159OP•2mo ago

okay no change except jarfix doesn't ask me to allow changes

dan1st•2mo ago

and double-clicking jarfix shows the output?

Lloyd_159OP•2mo ago

wait no it doesn't now imma restart my device ig?

dan1st•2mo ago

Then how did you get to that?

Lloyd_159OP•2mo ago

it appeared when running jarfix via double click, but no it doesn't

dan1st•2mo ago

maybe it's still open?

Lloyd_159OP•2mo ago

back I don't think it was but now I'm not too sure lol anyways I'll run the command again

Lloyd_159OP•2mo ago

okay now it has a different window

dan1st•2mo ago

that's good

Lloyd_159OP•2mo ago

should I try to run my .jar again?

dan1st•2mo ago

yes Now it configured to use JDK 20

Lloyd_159OP•2mo ago

oh yes it works nice, thanks xD

JavaBot•2mo ago

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Lloyd_159OP•2mo ago

so whenever I need to update jarfix I can just run it with /k?

dan1st•2mo ago

/k just means it tries to detect a JDK so it skips JREs

Lloyd_159OP•2mo ago

okay got it, thx

dan1st•2mo ago

it's also possible to specify a specific JDK

Lloyd_159OP•2mo ago

like by just adding the exact jdk instead of /k?

dan1st•2mo ago

no you'd need to run it with /x which generates an ini file to configure it - if you edit that file, you can change which JDK jarfix uses

dan1st•2mo ago

according to https://johann.loefflmann.net/en/software/jarfix/index.html

Jarfix

Jarfix fixes the jar file association on Windows

Lloyd_159OP•2mo ago

okay I'll definitely safe this xD

dan1st•2mo ago

alternatively you can just select to associate the .jar extension when installing a JDK At least with Adoptium/Temurin (the JDK I'd usually use), that works well

Lloyd_159OP•2mo ago

okay thanks again, thank you very much for your help <3

dan1st•2mo ago

If you install the JDK from Oracle, idk whether that option is present

Lloyd_159OP•2mo ago

I don't think so, but they seem to have their own download page

JavaBot•2mo ago

https://adoptium.net/temurin/releases/

Lloyd_159OP•2mo ago

yea that's where I've been rn :P

dan1st•2mo ago

I'd install Java from there because - It works well/doesn't cause issues - It's TCK certified (OracleJDK and most other major JDKs are as well) and production-ready - It's actually an Open Source version and you can use it commercially forever without paying for it - You have the option to enable/disable these things - some other things maybe

Lloyd_159OP•2mo ago

I've been using Amazon Corretto bc it's the intellij preset, but if you recommend this one I'll definitely change I think lol at least before creating the next project

dan1st•2mo ago

Coretto is fine as well But yeah if you install the JDK from inside IntelliJ, it won't ask you to associate the .jar extension

Lloyd_159OP•2mo ago

I guess I'll still have a look when I create my next project, bc I know nothing abt the jdk I use actually 😶‍🌫️

dan1st•2mo ago

The JDK is the Java installation you are using to develop your application newer JDK means you can use more Java features

Lloyd_159OP•2mo ago

yes I know that, i meant I don't know nothing about the difference between the distributions like corretto, adoptium, opendjk etc

dan1st•2mo ago

it's also possible to use a new JDK to write applications for older Java versions (if an application is written for some Java version, it can normally be used with all newer Java versions) but then you cannot use the new features of the new version these are just different vendors/organizations

Lloyd_159OP•2mo ago

okay gotcha

dan1st•2mo ago

or flavours in some cases (there are cases where some vendor has multiple flavours with some difference)

Lloyd_159OP•2mo ago

but the java features they provide are the same, right? like the code of openJDK 21 ir the same as adoptium 21 for example

dan1st•2mo ago

there's also https://whichjdk.com/ if you are interested

whichjdk.com

Which Version of JDK Should I Use?

dan1st•2mo ago

yes

Lloyd_159OP•2mo ago

oh okay this is useful

dan1st•2mo ago

though there isn't really a single "OpenJDK" using that name to refer to a specific JDK isn't really correct

Lloyd_159OP•2mo ago

like there are different organisations which call their jdk like that?

dan1st•2mo ago

both Adoptium/Temurin are openjdk/jdk distributions just like Coretto

Lloyd_159OP•2mo ago

oh okay that makes sense

Madjosz•2mo ago

I just change my registry entries directly.

dan1st•2mo ago

- OpenJDK is https://openjdk.org and https://github.com/openjdk - you can't download a JDK from there (only build it yourself) - Oracle is the company doing most of the work behind Java and provides OracleJDK (commercial) - they also make GraalVM - The Eclipse Foundation (a not for profit organization with many member companies) provides Temurin (Adoptium is their project name) - Amazon makes Corretto - Azul makes Zulu and Azul Prime - ...

GitHub

OpenJDK

OpenJDK has 124 repositories available. Follow their code on GitHub.

dan1st•2mo ago

I just don't use Windows lol and even on Windows, the Temurin msi installer sets it up properly

Lloyd_159OP•2mo ago

oooh okay, that made things more clear now

dan1st•2mo ago

the main difference is commercial support and licensing there are also some performance differences and some non-language (e.g. tooling, GC, etc) features in some cases

Lloyd_159OP•2mo ago

yea okay

JavaBot•2mo ago

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