Can't Get Mafia/Java to work together


New member
Using Windows 10 64bit and fully uptodate. Trying to install mafia again but get an error No Java found. did a fresh install of Java from Oracle AND the jdk versions of java. Still same error. Any ideas?


How are you installing mafia? Just dropping the jar into a directory?

How are you running it? Double clicking on the mafia jar file?

Is Java on the path in your environment?

Can you open a command line, type "java -version" and get something like
C:\Users\CafeBabe>java -version
java version "13.0.2" 2020-01-14
Java(TM) SE Runtime Environment (build 13.0.2+8)
Java HotSpot(TM) 64-Bit Server VM (build 13.0.2+8, mixed mode, sharing)


Do any Java jar files execute in your environment?

My guess is that your Java install is incomplete or bad but we might as well narrow down the possibilities.
Some recent JDK installers don't add java.exe to the PATH environment by default. You might have missed some checkbox that reads "Add Java to PATH" or "Set JAVA_HOME" when installing the JDK or the JRE.

If you don't want to reinstall the JDK/JRE, you can manually update the PATH and/or JAVA_HOME variable. Check the Set Environment Variables section of this guide for an idea of what you need to do.


New member
C:\Users\ancie>java -version
java version "16.0.1" 2021-04-20
Java(TM) SE Runtime Environment (build 16.0.1+9-24)
Java HotSpot(TM) 64-Bit Server VM (build 16.0.1+9-24, mixed mode, sharing)

followed the above and still not able to get anything from mafia when opening it other than an error saying no java.


File associations is the term that describes how Widows knows what program should open a type of file.

Right click on the jar file and then Open With. That should give you a way to select what to use to open the file and it should be Java. I can't grab a screenshot for you.


Staff member
I think it was almost no one used them and we only built them for point releases.


Windows 10 doesn't seem to give me an open with, any suggestions?
I navigated to the directory with the Kolmafia jar, highlighted it to select it, used a right click and brought up the menu. Open at the top should be bold. If it isn't try and open the jar file and it should ask you to pick a program which should be java.

Screenshot 2021-05-01 154026.png